From eca86fad3d823c3c1e7e78b07752aa6a10e35283 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 10 Apr 2014 20:01:24 -0600 Subject: Rename hush to cli_hush Hush is a command-line interpreter, so rename it to make that clearer. Signed-off-by: Simon Glass diff --git a/board/keymile/common/common.c b/board/keymile/common/common.c index f941e44..2ddb3da 100644 --- a/board/keymile/common/common.c +++ b/board/keymile/common/common.c @@ -12,7 +12,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/board/keymile/common/ivm.c b/board/keymile/common/ivm.c index f0e91bb..bffc08b 100644 --- a/board/keymile/common/ivm.c +++ b/board/keymile/common/ivm.c @@ -6,7 +6,7 @@ */ #include -#include +#include #include #include "common.h" diff --git a/common/Makefile b/common/Makefile index 219cb51..da184a8 100644 --- a/common/Makefile +++ b/common/Makefile @@ -11,7 +11,7 @@ obj-y += main.o obj-y += command.o obj-y += exports.o obj-y += hash.o -obj-$(CONFIG_SYS_HUSH_PARSER) += hush.o +obj-$(CONFIG_SYS_HUSH_PARSER) += cli_hush.o obj-y += s_record.o obj-y += xyzModem.o obj-y += cmd_disk.o diff --git a/common/cli_hush.c b/common/cli_hush.c new file mode 100644 index 0000000..012004a --- /dev/null +++ b/common/cli_hush.c @@ -0,0 +1,3687 @@ +/* + * sh.c -- a prototype Bourne shell grammar parser + * Intended to follow the original Thompson and Ritchie + * "small and simple is beautiful" philosophy, which + * incidentally is a good match to today's BusyBox. + * + * Copyright (C) 2000,2001 Larry Doolittle + * + * Credits: + * The parser routines proper are all original material, first + * written Dec 2000 and Jan 2001 by Larry Doolittle. + * The execution engine, the builtins, and much of the underlying + * support has been adapted from busybox-0.49pre's lash, + * which is Copyright (C) 2000 by Lineo, Inc., and + * written by Erik Andersen , . + * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and + * Erik W. Troan, which they placed in the public domain. I don't know + * how much of the Johnson/Troan code has survived the repeated rewrites. + * Other credits: + * b_addchr() derived from similar w_addchar function in glibc-2.2 + * setup_redirect(), redirect_opt_num(), and big chunks of main() + * and many builtins derived from contributions by Erik Andersen + * miscellaneous bugfixes from Matt Kraai + * + * There are two big (and related) architecture differences between + * this parser and the lash parser. One is that this version is + * actually designed from the ground up to understand nearly all + * of the Bourne grammar. The second, consequential change is that + * the parser and input reader have been turned inside out. Now, + * the parser is in control, and asks for input as needed. The old + * way had the input reader in control, and it asked for parsing to + * take place as needed. The new way makes it much easier to properly + * handle the recursion implicit in the various substitutions, especially + * across continuation lines. + * + * Bash grammar not implemented: (how many of these were in original sh?) + * $@ (those sure look like weird quoting rules) + * $_ + * ! negation operator for pipes + * &> and >& redirection of stdout+stderr + * Brace Expansion + * Tilde Expansion + * fancy forms of Parameter Expansion + * aliases + * Arithmetic Expansion + * <(list) and >(list) Process Substitution + * reserved words: case, esac, select, function + * Here Documents ( << word ) + * Functions + * Major bugs: + * job handling woefully incomplete and buggy + * reserved word execution woefully incomplete and buggy + * to-do: + * port selected bugfixes from post-0.49 busybox lash - done? + * finish implementing reserved words: for, while, until, do, done + * change { and } from special chars to reserved words + * builtins: break, continue, eval, return, set, trap, ulimit + * test magic exec + * handle children going into background + * clean up recognition of null pipes + * check setting of global_argc and global_argv + * control-C handling, probably with longjmp + * follow IFS rules more precisely, including update semantics + * figure out what to do with backslash-newline + * explain why we use signal instead of sigaction + * propagate syntax errors, die on resource errors? + * continuation lines, both explicit and implicit - done? + * memory leak finding and plugging - done? + * more testing, especially quoting rules and redirection + * document how quoting rules not precisely followed for variable assignments + * maybe change map[] to use 2-bit entries + * (eventually) remove all the printf's + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#define __U_BOOT__ +#ifdef __U_BOOT__ +#include /* malloc, free, realloc*/ +#include /* isalpha, isdigit */ +#include /* readline */ +#include +#include /* find_cmd */ +#ifndef CONFIG_SYS_PROMPT_HUSH_PS2 +#define CONFIG_SYS_PROMPT_HUSH_PS2 "> " +#endif +#endif +#ifndef __U_BOOT__ +#include /* isalpha, isdigit */ +#include /* getpid */ +#include /* getenv, atoi */ +#include /* strchr */ +#include /* popen etc. */ +#include /* glob, of course */ +#include /* va_list */ +#include +#include +#include /* should be pretty obvious */ + +#include /* ulimit */ +#include +#include +#include + +/* #include */ + +#if 1 +#include "busybox.h" +#include "cmdedit.h" +#else +#define applet_name "hush" +#include "standalone.h" +#define hush_main main +#undef CONFIG_FEATURE_SH_FANCY_PROMPT +#define BB_BANNER +#endif +#endif +#define SPECIAL_VAR_SYMBOL 03 +#define SUBSTED_VAR_SYMBOL 04 +#ifndef __U_BOOT__ +#define FLAG_EXIT_FROM_LOOP 1 +#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ +#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ + +#endif + +#ifdef __U_BOOT__ +DECLARE_GLOBAL_DATA_PTR; + +#define EXIT_SUCCESS 0 +#define EOF -1 +#define syntax() syntax_err() +#define xstrdup strdup +#define error_msg printf +#else +typedef enum { + REDIRECT_INPUT = 1, + REDIRECT_OVERWRITE = 2, + REDIRECT_APPEND = 3, + REDIRECT_HEREIS = 4, + REDIRECT_IO = 5 +} redir_type; + +/* The descrip member of this structure is only used to make debugging + * output pretty */ +struct {int mode; int default_fd; char *descrip;} redir_table[] = { + { 0, 0, "()" }, + { O_RDONLY, 0, "<" }, + { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, + { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, + { O_RDONLY, -1, "<<" }, + { O_RDWR, 1, "<>" } +}; +#endif + +typedef enum { + PIPE_SEQ = 1, + PIPE_AND = 2, + PIPE_OR = 3, + PIPE_BG = 4, +} pipe_style; + +/* might eventually control execution */ +typedef enum { + RES_NONE = 0, + RES_IF = 1, + RES_THEN = 2, + RES_ELIF = 3, + RES_ELSE = 4, + RES_FI = 5, + RES_FOR = 6, + RES_WHILE = 7, + RES_UNTIL = 8, + RES_DO = 9, + RES_DONE = 10, + RES_XXXX = 11, + RES_IN = 12, + RES_SNTX = 13 +} reserved_style; +#define FLAG_END (1<, but protected with __USE_GNU */ +#endif + +/* "globals" within this file */ +static uchar *ifs; +static char map[256]; +#ifndef __U_BOOT__ +static int fake_mode; +static int interactive; +static struct close_me *close_me_head; +static const char *cwd; +static struct pipe *job_list; +static unsigned int last_bg_pid; +static unsigned int last_jobid; +static unsigned int shell_terminal; +static char *PS1; +static char *PS2; +struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; +struct variables *top_vars = &shell_ver; +#else +static int flag_repeat = 0; +static int do_repeat = 0; +static struct variables *top_vars = NULL ; +#endif /*__U_BOOT__ */ + +#define B_CHUNK (100) +#define B_NOSPAC 1 + +typedef struct { + char *data; + int length; + int maxlen; + int quote; + int nonnull; +} o_string; +#define NULL_O_STRING {NULL,0,0,0,0} +/* used for initialization: + o_string foo = NULL_O_STRING; */ + +/* I can almost use ordinary FILE *. Is open_memstream() universally + * available? Where is it documented? */ +struct in_str { + const char *p; +#ifndef __U_BOOT__ + char peek_buf[2]; +#endif + int __promptme; + int promptmode; +#ifndef __U_BOOT__ + FILE *file; +#endif + int (*get) (struct in_str *); + int (*peek) (struct in_str *); +}; +#define b_getch(input) ((input)->get(input)) +#define b_peek(input) ((input)->peek(input)) + +#ifndef __U_BOOT__ +#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" + +struct built_in_command { + char *cmd; /* name */ + char *descr; /* description */ + int (*function) (struct child_prog *); /* function ptr */ +}; +#endif + +/* define DEBUG_SHELL for debugging output (obviously ;-)) */ +#if 0 +#define DEBUG_SHELL +#endif + +/* This should be in utility.c */ +#ifdef DEBUG_SHELL +#ifndef __U_BOOT__ +static void debug_printf(const char *format, ...) +{ + va_list args; + va_start(args, format); + vfprintf(stderr, format, args); + va_end(args); +} +#else +#define debug_printf(fmt,args...) printf (fmt ,##args) +#endif +#else +static inline void debug_printf(const char *format, ...) { } +#endif +#define final_printf debug_printf + +#ifdef __U_BOOT__ +static void syntax_err(void) { + printf("syntax error\n"); +} +#else +static void __syntax(char *file, int line) { + error_msg("syntax error %s:%d", file, line); +} +#define syntax() __syntax(__FILE__, __LINE__) +#endif + +#ifdef __U_BOOT__ +static void *xmalloc(size_t size); +static void *xrealloc(void *ptr, size_t size); +#else +/* Index of subroutines: */ +/* function prototypes for builtins */ +static int builtin_cd(struct child_prog *child); +static int builtin_env(struct child_prog *child); +static int builtin_eval(struct child_prog *child); +static int builtin_exec(struct child_prog *child); +static int builtin_exit(struct child_prog *child); +static int builtin_export(struct child_prog *child); +static int builtin_fg_bg(struct child_prog *child); +static int builtin_help(struct child_prog *child); +static int builtin_jobs(struct child_prog *child); +static int builtin_pwd(struct child_prog *child); +static int builtin_read(struct child_prog *child); +static int builtin_set(struct child_prog *child); +static int builtin_shift(struct child_prog *child); +static int builtin_source(struct child_prog *child); +static int builtin_umask(struct child_prog *child); +static int builtin_unset(struct child_prog *child); +static int builtin_not_written(struct child_prog *child); +#endif +/* o_string manipulation: */ +static int b_check_space(o_string *o, int len); +static int b_addchr(o_string *o, int ch); +static void b_reset(o_string *o); +static int b_addqchr(o_string *o, int ch, int quote); +#ifndef __U_BOOT__ +static int b_adduint(o_string *o, unsigned int i); +#endif +/* in_str manipulations: */ +static int static_get(struct in_str *i); +static int static_peek(struct in_str *i); +static int file_get(struct in_str *i); +static int file_peek(struct in_str *i); +#ifndef __U_BOOT__ +static void setup_file_in_str(struct in_str *i, FILE *f); +#else +static void setup_file_in_str(struct in_str *i); +#endif +static void setup_string_in_str(struct in_str *i, const char *s); +#ifndef __U_BOOT__ +/* close_me manipulations: */ +static void mark_open(int fd); +static void mark_closed(int fd); +static void close_all(void); +#endif +/* "run" the final data structures: */ +static char *indenter(int i); +static int free_pipe_list(struct pipe *head, int indent); +static int free_pipe(struct pipe *pi, int indent); +/* really run the final data structures: */ +#ifndef __U_BOOT__ +static int setup_redirects(struct child_prog *prog, int squirrel[]); +#endif +static int run_list_real(struct pipe *pi); +#ifndef __U_BOOT__ +static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); +#endif +static int run_pipe_real(struct pipe *pi); +/* extended glob support: */ +#ifndef __U_BOOT__ +static int globhack(const char *src, int flags, glob_t *pglob); +static int glob_needed(const char *s); +static int xglob(o_string *dest, int flags, glob_t *pglob); +#endif +/* variable assignment: */ +static int is_assignment(const char *s); +/* data structure manipulation: */ +#ifndef __U_BOOT__ +static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); +#endif +static void initialize_context(struct p_context *ctx); +static int done_word(o_string *dest, struct p_context *ctx); +static int done_command(struct p_context *ctx); +static int done_pipe(struct p_context *ctx, pipe_style type); +/* primary string parsing: */ +#ifndef __U_BOOT__ +static int redirect_dup_num(struct in_str *input); +static int redirect_opt_num(o_string *o); +static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); +static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); +#endif +static char *lookup_param(char *src); +static char *make_string(char **inp, int *nonnull); +static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); +#ifndef __U_BOOT__ +static int parse_string(o_string *dest, struct p_context *ctx, const char *src); +#endif +static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); +/* setup: */ +static int parse_stream_outer(struct in_str *inp, int flag); +#ifndef __U_BOOT__ +static int parse_string_outer(const char *s, int flag); +static int parse_file_outer(FILE *f); +#endif +#ifndef __U_BOOT__ +/* job management: */ +static int checkjobs(struct pipe* fg_pipe); +static void insert_bg_job(struct pipe *pi); +static void remove_bg_job(struct pipe *pi); +#endif +/* local variable support */ +static char **make_list_in(char **inp, char *name); +static char *insert_var_value(char *inp); +static char *insert_var_value_sub(char *inp, int tag_subst); + +#ifndef __U_BOOT__ +/* Table of built-in functions. They can be forked or not, depending on + * context: within pipes, they fork. As simple commands, they do not. + * When used in non-forking context, they can change global variables + * in the parent shell process. If forked, of course they can not. + * For example, 'unset foo | whatever' will parse and run, but foo will + * still be set at the end. */ +static struct built_in_command bltins[] = { + {"bg", "Resume a job in the background", builtin_fg_bg}, + {"break", "Exit for, while or until loop", builtin_not_written}, + {"cd", "Change working directory", builtin_cd}, + {"continue", "Continue for, while or until loop", builtin_not_written}, + {"env", "Print all environment variables", builtin_env}, + {"eval", "Construct and run shell command", builtin_eval}, + {"exec", "Exec command, replacing this shell with the exec'd process", + builtin_exec}, + {"exit", "Exit from shell()", builtin_exit}, + {"export", "Set environment variable", builtin_export}, + {"fg", "Bring job into the foreground", builtin_fg_bg}, + {"jobs", "Lists the active jobs", builtin_jobs}, + {"pwd", "Print current directory", builtin_pwd}, + {"read", "Input environment variable", builtin_read}, + {"return", "Return from a function", builtin_not_written}, + {"set", "Set/unset shell local variables", builtin_set}, + {"shift", "Shift positional parameters", builtin_shift}, + {"trap", "Trap signals", builtin_not_written}, + {"ulimit","Controls resource limits", builtin_not_written}, + {"umask","Sets file creation mask", builtin_umask}, + {"unset", "Unset environment variable", builtin_unset}, + {".", "Source-in and run commands in a file", builtin_source}, + {"help", "List shell built-in commands", builtin_help}, + {NULL, NULL, NULL} +}; + +static const char *set_cwd(void) +{ + if(cwd==unknown) + cwd = NULL; /* xgetcwd(arg) called free(arg) */ + cwd = xgetcwd((char *)cwd); + if (!cwd) + cwd = unknown; + return cwd; +} + +/* built-in 'eval' handler */ +static int builtin_eval(struct child_prog *child) +{ + char *str = NULL; + int rcode = EXIT_SUCCESS; + + if (child->argv[1]) { + str = make_string(child->argv + 1); + parse_string_outer(str, FLAG_EXIT_FROM_LOOP | + FLAG_PARSE_SEMICOLON); + free(str); + rcode = last_return_code; + } + return rcode; +} + +/* built-in 'cd ' handler */ +static int builtin_cd(struct child_prog *child) +{ + char *newdir; + if (child->argv[1] == NULL) + newdir = getenv("HOME"); + else + newdir = child->argv[1]; + if (chdir(newdir)) { + printf("cd: %s: %s\n", newdir, strerror(errno)); + return EXIT_FAILURE; + } + set_cwd(); + return EXIT_SUCCESS; +} + +/* built-in 'env' handler */ +static int builtin_env(struct child_prog *dummy) +{ + char **e = environ; + if (e == NULL) return EXIT_FAILURE; + for (; *e; e++) { + puts(*e); + } + return EXIT_SUCCESS; +} + +/* built-in 'exec' handler */ +static int builtin_exec(struct child_prog *child) +{ + if (child->argv[1] == NULL) + return EXIT_SUCCESS; /* Really? */ + child->argv++; + pseudo_exec(child); + /* never returns */ +} + +/* built-in 'exit' handler */ +static int builtin_exit(struct child_prog *child) +{ + if (child->argv[1] == NULL) + exit(last_return_code); + exit (atoi(child->argv[1])); +} + +/* built-in 'export VAR=value' handler */ +static int builtin_export(struct child_prog *child) +{ + int res = 0; + char *name = child->argv[1]; + + if (name == NULL) { + return (builtin_env(child)); + } + + name = strdup(name); + + if(name) { + char *value = strchr(name, '='); + + if (!value) { + char *tmp; + /* They are exporting something without an =VALUE */ + + value = get_local_var(name); + if (value) { + size_t ln = strlen(name); + + tmp = realloc(name, ln+strlen(value)+2); + if(tmp==NULL) + res = -1; + else { + sprintf(tmp+ln, "=%s", value); + name = tmp; + } + } else { + /* bash does not return an error when trying to export + * an undefined variable. Do likewise. */ + res = 1; + } + } + } + if (res<0) + perror_msg("export"); + else if(res==0) + res = set_local_var(name, 1); + else + res = 0; + free(name); + return res; +} + +/* built-in 'fg' and 'bg' handler */ +static int builtin_fg_bg(struct child_prog *child) +{ + int i, jobnum; + struct pipe *pi=NULL; + + if (!interactive) + return EXIT_FAILURE; + /* If they gave us no args, assume they want the last backgrounded task */ + if (!child->argv[1]) { + for (pi = job_list; pi; pi = pi->next) { + if (pi->jobid == last_jobid) { + break; + } + } + if (!pi) { + error_msg("%s: no current job", child->argv[0]); + return EXIT_FAILURE; + } + } else { + if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { + error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); + return EXIT_FAILURE; + } + for (pi = job_list; pi; pi = pi->next) { + if (pi->jobid == jobnum) { + break; + } + } + if (!pi) { + error_msg("%s: %d: no such job", child->argv[0], jobnum); + return EXIT_FAILURE; + } + } + + if (*child->argv[0] == 'f') { + /* Put the job into the foreground. */ + tcsetpgrp(shell_terminal, pi->pgrp); + } + + /* Restart the processes in the job */ + for (i = 0; i < pi->num_progs; i++) + pi->progs[i].is_stopped = 0; + + if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { + if (i == ESRCH) { + remove_bg_job(pi); + } else { + perror_msg("kill (SIGCONT)"); + } + } + + pi->stopped_progs = 0; + return EXIT_SUCCESS; +} + +/* built-in 'help' handler */ +static int builtin_help(struct child_prog *dummy) +{ + struct built_in_command *x; + + printf("\nBuilt-in commands:\n"); + printf("-------------------\n"); + for (x = bltins; x->cmd; x++) { + if (x->descr==NULL) + continue; + printf("%s\t%s\n", x->cmd, x->descr); + } + printf("\n\n"); + return EXIT_SUCCESS; +} + +/* built-in 'jobs' handler */ +static int builtin_jobs(struct child_prog *child) +{ + struct pipe *job; + char *status_string; + + for (job = job_list; job; job = job->next) { + if (job->running_progs == job->stopped_progs) + status_string = "Stopped"; + else + status_string = "Running"; + + printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); + } + return EXIT_SUCCESS; +} + + +/* built-in 'pwd' handler */ +static int builtin_pwd(struct child_prog *dummy) +{ + puts(set_cwd()); + return EXIT_SUCCESS; +} + +/* built-in 'read VAR' handler */ +static int builtin_read(struct child_prog *child) +{ + int res; + + if (child->argv[1]) { + char string[BUFSIZ]; + char *var = 0; + + string[0] = 0; /* In case stdin has only EOF */ + /* read string */ + fgets(string, sizeof(string), stdin); + chomp(string); + var = malloc(strlen(child->argv[1])+strlen(string)+2); + if(var) { + sprintf(var, "%s=%s", child->argv[1], string); + res = set_local_var(var, 0); + } else + res = -1; + if (res) + fprintf(stderr, "read: %m\n"); + free(var); /* So not move up to avoid breaking errno */ + return res; + } else { + do res=getchar(); while(res!='\n' && res!=EOF); + return 0; + } +} + +/* built-in 'set VAR=value' handler */ +static int builtin_set(struct child_prog *child) +{ + char *temp = child->argv[1]; + struct variables *e; + + if (temp == NULL) + for(e = top_vars; e; e=e->next) + printf("%s=%s\n", e->name, e->value); + else + set_local_var(temp, 0); + + return EXIT_SUCCESS; +} + + +/* Built-in 'shift' handler */ +static int builtin_shift(struct child_prog *child) +{ + int n=1; + if (child->argv[1]) { + n=atoi(child->argv[1]); + } + if (n>=0 && nargv[1] == NULL) + return EXIT_FAILURE; + + /* XXX search through $PATH is missing */ + input = fopen(child->argv[1], "r"); + if (!input) { + error_msg("Couldn't open file '%s'", child->argv[1]); + return EXIT_FAILURE; + } + + /* Now run the file */ + /* XXX argv and argc are broken; need to save old global_argv + * (pointer only is OK!) on this stack frame, + * set global_argv=child->argv+1, recurse, and restore. */ + mark_open(fileno(input)); + status = parse_file_outer(input); + mark_closed(fileno(input)); + fclose(input); + return (status); +} + +static int builtin_umask(struct child_prog *child) +{ + mode_t new_umask; + const char *arg = child->argv[1]; + char *end; + if (arg) { + new_umask=strtoul(arg, &end, 8); + if (*end!='\0' || end == arg) { + return EXIT_FAILURE; + } + } else { + printf("%.3o\n", (unsigned int) (new_umask=umask(0))); + } + umask(new_umask); + return EXIT_SUCCESS; +} + +/* built-in 'unset VAR' handler */ +static int builtin_unset(struct child_prog *child) +{ + /* bash returned already true */ + unset_local_var(child->argv[1]); + return EXIT_SUCCESS; +} + +static int builtin_not_written(struct child_prog *child) +{ + printf("builtin_%s not written\n",child->argv[0]); + return EXIT_FAILURE; +} +#endif + +static int b_check_space(o_string *o, int len) +{ + /* It would be easy to drop a more restrictive policy + * in here, such as setting a maximum string length */ + if (o->length + len > o->maxlen) { + char *old_data = o->data; + /* assert (data == NULL || o->maxlen != 0); */ + o->maxlen += max(2*len, B_CHUNK); + o->data = realloc(o->data, 1 + o->maxlen); + if (o->data == NULL) { + free(old_data); + } + } + return o->data == NULL; +} + +static int b_addchr(o_string *o, int ch) +{ + debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); + if (b_check_space(o, 1)) return B_NOSPAC; + o->data[o->length] = ch; + o->length++; + o->data[o->length] = '\0'; + return 0; +} + +static void b_reset(o_string *o) +{ + o->length = 0; + o->nonnull = 0; + if (o->data != NULL) *o->data = '\0'; +} + +static void b_free(o_string *o) +{ + b_reset(o); + free(o->data); + o->data = NULL; + o->maxlen = 0; +} + +/* My analysis of quoting semantics tells me that state information + * is associated with a destination, not a source. + */ +static int b_addqchr(o_string *o, int ch, int quote) +{ + if (quote && strchr("*?[\\",ch)) { + int rc; + rc = b_addchr(o, '\\'); + if (rc) return rc; + } + return b_addchr(o, ch); +} + +#ifndef __U_BOOT__ +static int b_adduint(o_string *o, unsigned int i) +{ + int r; + char *p = simple_itoa(i); + /* no escape checking necessary */ + do r=b_addchr(o, *p++); while (r==0 && *p); + return r; +} +#endif + +static int static_get(struct in_str *i) +{ + int ch = *i->p++; + if (ch=='\0') return EOF; + return ch; +} + +static int static_peek(struct in_str *i) +{ + return *i->p; +} + +#ifndef __U_BOOT__ +static inline void cmdedit_set_initial_prompt(void) +{ +#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT + PS1 = NULL; +#else + PS1 = getenv("PS1"); + if(PS1==0) + PS1 = "\\w \\$ "; +#endif +} + +static inline void setup_prompt_string(int promptmode, char **prompt_str) +{ + debug_printf("setup_prompt_string %d ",promptmode); +#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT + /* Set up the prompt */ + if (promptmode == 1) { + free(PS1); + PS1=xmalloc(strlen(cwd)+4); + sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); + *prompt_str = PS1; + } else { + *prompt_str = PS2; + } +#else + *prompt_str = (promptmode==1)? PS1 : PS2; +#endif + debug_printf("result %s\n",*prompt_str); +} +#endif + +static void get_user_input(struct in_str *i) +{ +#ifndef __U_BOOT__ + char *prompt_str; + static char the_command[BUFSIZ]; + + setup_prompt_string(i->promptmode, &prompt_str); +#ifdef CONFIG_FEATURE_COMMAND_EDITING + /* + ** enable command line editing only while a command line + ** is actually being read; otherwise, we'll end up bequeathing + ** atexit() handlers and other unwanted stuff to our + ** child processes (rob@sysgo.de) + */ + cmdedit_read_input(prompt_str, the_command); +#else + fputs(prompt_str, stdout); + fflush(stdout); + the_command[0]=fgetc(i->file); + the_command[1]='\0'; +#endif + fflush(stdout); + i->p = the_command; +#else + int n; + static char the_command[CONFIG_SYS_CBSIZE + 1]; + +#ifdef CONFIG_BOOT_RETRY_TIME +# ifndef CONFIG_RESET_TO_RETRY +# error "This currently only works with CONFIG_RESET_TO_RETRY enabled" +# endif + reset_cmd_timeout(); +#endif + i->__promptme = 1; + if (i->promptmode == 1) { + n = readline(CONFIG_SYS_PROMPT); + } else { + n = readline(CONFIG_SYS_PROMPT_HUSH_PS2); + } +#ifdef CONFIG_BOOT_RETRY_TIME + if (n == -2) { + puts("\nTimeout waiting for command\n"); +# ifdef CONFIG_RESET_TO_RETRY + do_reset(NULL, 0, 0, NULL); +# else +# error "This currently only works with CONFIG_RESET_TO_RETRY enabled" +# endif + } +#endif + if (n == -1 ) { + flag_repeat = 0; + i->__promptme = 0; + } + n = strlen(console_buffer); + console_buffer[n] = '\n'; + console_buffer[n+1]= '\0'; + if (had_ctrlc()) flag_repeat = 0; + clear_ctrlc(); + do_repeat = 0; + if (i->promptmode == 1) { + if (console_buffer[0] == '\n'&& flag_repeat == 0) { + strcpy(the_command,console_buffer); + } + else { + if (console_buffer[0] != '\n') { + strcpy(the_command,console_buffer); + flag_repeat = 1; + } + else { + do_repeat = 1; + } + } + i->p = the_command; + } + else { + if (console_buffer[0] != '\n') { + if (strlen(the_command) + strlen(console_buffer) + < CONFIG_SYS_CBSIZE) { + n = strlen(the_command); + the_command[n-1] = ' '; + strcpy(&the_command[n],console_buffer); + } + else { + the_command[0] = '\n'; + the_command[1] = '\0'; + flag_repeat = 0; + } + } + if (i->__promptme == 0) { + the_command[0] = '\n'; + the_command[1] = '\0'; + } + i->p = console_buffer; + } +#endif +} + +/* This is the magic location that prints prompts + * and gets data back from the user */ +static int file_get(struct in_str *i) +{ + int ch; + + ch = 0; + /* If there is data waiting, eat it up */ + if (i->p && *i->p) { + ch = *i->p++; + } else { + /* need to double check i->file because we might be doing something + * more complicated by now, like sourcing or substituting. */ +#ifndef __U_BOOT__ + if (i->__promptme && interactive && i->file == stdin) { + while(! i->p || (interactive && strlen(i->p)==0) ) { +#else + while(! i->p || strlen(i->p)==0 ) { +#endif + get_user_input(i); + } + i->promptmode=2; +#ifndef __U_BOOT__ + i->__promptme = 0; +#endif + if (i->p && *i->p) { + ch = *i->p++; + } +#ifndef __U_BOOT__ + } else { + ch = fgetc(i->file); + } + +#endif + debug_printf("b_getch: got a %d\n", ch); + } +#ifndef __U_BOOT__ + if (ch == '\n') i->__promptme=1; +#endif + return ch; +} + +/* All the callers guarantee this routine will never be + * used right after a newline, so prompting is not needed. + */ +static int file_peek(struct in_str *i) +{ +#ifndef __U_BOOT__ + if (i->p && *i->p) { +#endif + return *i->p; +#ifndef __U_BOOT__ + } else { + i->peek_buf[0] = fgetc(i->file); + i->peek_buf[1] = '\0'; + i->p = i->peek_buf; + debug_printf("b_peek: got a %d\n", *i->p); + return *i->p; + } +#endif +} + +#ifndef __U_BOOT__ +static void setup_file_in_str(struct in_str *i, FILE *f) +#else +static void setup_file_in_str(struct in_str *i) +#endif +{ + i->peek = file_peek; + i->get = file_get; + i->__promptme=1; + i->promptmode=1; +#ifndef __U_BOOT__ + i->file = f; +#endif + i->p = NULL; +} + +static void setup_string_in_str(struct in_str *i, const char *s) +{ + i->peek = static_peek; + i->get = static_get; + i->__promptme=1; + i->promptmode=1; + i->p = s; +} + +#ifndef __U_BOOT__ +static void mark_open(int fd) +{ + struct close_me *new = xmalloc(sizeof(struct close_me)); + new->fd = fd; + new->next = close_me_head; + close_me_head = new; +} + +static void mark_closed(int fd) +{ + struct close_me *tmp; + if (close_me_head == NULL || close_me_head->fd != fd) + error_msg_and_die("corrupt close_me"); + tmp = close_me_head; + close_me_head = close_me_head->next; + free(tmp); +} + +static void close_all(void) +{ + struct close_me *c; + for (c=close_me_head; c; c=c->next) { + close(c->fd); + } + close_me_head = NULL; +} + +/* squirrel != NULL means we squirrel away copies of stdin, stdout, + * and stderr if they are redirected. */ +static int setup_redirects(struct child_prog *prog, int squirrel[]) +{ + int openfd, mode; + struct redir_struct *redir; + + for (redir=prog->redirects; redir; redir=redir->next) { + if (redir->dup == -1 && redir->word.gl_pathv == NULL) { + /* something went wrong in the parse. Pretend it didn't happen */ + continue; + } + if (redir->dup == -1) { + mode=redir_table[redir->type].mode; + openfd = open(redir->word.gl_pathv[0], mode, 0666); + if (openfd < 0) { + /* this could get lost if stderr has been redirected, but + bash and ash both lose it as well (though zsh doesn't!) */ + perror_msg("error opening %s", redir->word.gl_pathv[0]); + return 1; + } + } else { + openfd = redir->dup; + } + + if (openfd != redir->fd) { + if (squirrel && redir->fd < 3) { + squirrel[redir->fd] = dup(redir->fd); + } + if (openfd == -3) { + close(openfd); + } else { + dup2(openfd, redir->fd); + if (redir->dup == -1) + close (openfd); + } + } + } + return 0; +} + +static void restore_redirects(int squirrel[]) +{ + int i, fd; + for (i=0; i<3; i++) { + fd = squirrel[i]; + if (fd != -1) { + /* No error checking. I sure wouldn't know what + * to do with an error if I found one! */ + dup2(fd, i); + close(fd); + } + } +} + +/* never returns */ +/* XXX no exit() here. If you don't exec, use _exit instead. + * The at_exit handlers apparently confuse the calling process, + * in particular stdin handling. Not sure why? */ +static void pseudo_exec(struct child_prog *child) +{ + int i, rcode; + char *p; + struct built_in_command *x; + if (child->argv) { + for (i=0; is_assignment(child->argv[i]); i++) { + debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); + p = insert_var_value(child->argv[i]); + putenv(strdup(p)); + if (p != child->argv[i]) free(p); + } + child->argv+=i; /* XXX this hack isn't so horrible, since we are about + to exit, and therefore don't need to keep data + structures consistent for free() use. */ + /* If a variable is assigned in a forest, and nobody listens, + * was it ever really set? + */ + if (child->argv[0] == NULL) { + _exit(EXIT_SUCCESS); + } + + /* + * Check if the command matches any of the builtins. + * Depending on context, this might be redundant. But it's + * easier to waste a few CPU cycles than it is to figure out + * if this is one of those cases. + */ + for (x = bltins; x->cmd; x++) { + if (strcmp(child->argv[0], x->cmd) == 0 ) { + debug_printf("builtin exec %s\n", child->argv[0]); + rcode = x->function(child); + fflush(stdout); + _exit(rcode); + } + } + + /* Check if the command matches any busybox internal commands + * ("applets") here. + * FIXME: This feature is not 100% safe, since + * BusyBox is not fully reentrant, so we have no guarantee the things + * from the .bss are still zeroed, or that things from .data are still + * at their defaults. We could exec ourself from /proc/self/exe, but I + * really dislike relying on /proc for things. We could exec ourself + * from global_argv[0], but if we are in a chroot, we may not be able + * to find ourself... */ +#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL + { + int argc_l; + char** argv_l=child->argv; + char *name = child->argv[0]; + +#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN + /* Following discussions from November 2000 on the busybox mailing + * list, the default configuration, (without + * get_last_path_component()) lets the user force use of an + * external command by specifying the full (with slashes) filename. + * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets + * _aways_ override external commands, so if you want to run + * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the + * filesystem and is _not_ busybox. Some systems may want this, + * most do not. */ + name = get_last_path_component(name); +#endif + /* Count argc for use in a second... */ + for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); + optind = 1; + debug_printf("running applet %s\n", name); + run_applet_by_name(name, argc_l, child->argv); + } +#endif + debug_printf("exec of %s\n",child->argv[0]); + execvp(child->argv[0],child->argv); + perror_msg("couldn't exec: %s",child->argv[0]); + _exit(1); + } else if (child->group) { + debug_printf("runtime nesting to group\n"); + interactive=0; /* crucial!!!! */ + rcode = run_list_real(child->group); + /* OK to leak memory by not calling free_pipe_list, + * since this process is about to exit */ + _exit(rcode); + } else { + /* Can happen. See what bash does with ">foo" by itself. */ + debug_printf("trying to pseudo_exec null command\n"); + _exit(EXIT_SUCCESS); + } +} + +static void insert_bg_job(struct pipe *pi) +{ + struct pipe *thejob; + + /* Linear search for the ID of the job to use */ + pi->jobid = 1; + for (thejob = job_list; thejob; thejob = thejob->next) + if (thejob->jobid >= pi->jobid) + pi->jobid = thejob->jobid + 1; + + /* add thejob to the list of running jobs */ + if (!job_list) { + thejob = job_list = xmalloc(sizeof(*thejob)); + } else { + for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; + thejob->next = xmalloc(sizeof(*thejob)); + thejob = thejob->next; + } + + /* physically copy the struct job */ + memcpy(thejob, pi, sizeof(struct pipe)); + thejob->next = NULL; + thejob->running_progs = thejob->num_progs; + thejob->stopped_progs = 0; + thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ + + /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ + { + char *bar=thejob->text; + char **foo=pi->progs[0].argv; + while(foo && *foo) { + bar += sprintf(bar, "%s ", *foo++); + } + } + + /* we don't wait for background thejobs to return -- append it + to the list of backgrounded thejobs and leave it alone */ + printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); + last_bg_pid = thejob->progs[0].pid; + last_jobid = thejob->jobid; +} + +/* remove a backgrounded job */ +static void remove_bg_job(struct pipe *pi) +{ + struct pipe *prev_pipe; + + if (pi == job_list) { + job_list = pi->next; + } else { + prev_pipe = job_list; + while (prev_pipe->next != pi) + prev_pipe = prev_pipe->next; + prev_pipe->next = pi->next; + } + if (job_list) + last_jobid = job_list->jobid; + else + last_jobid = 0; + + pi->stopped_progs = 0; + free_pipe(pi, 0); + free(pi); +} + +/* Checks to see if any processes have exited -- if they + have, figure out why and see if a job has completed */ +static int checkjobs(struct pipe* fg_pipe) +{ + int attributes; + int status; + int prognum = 0; + struct pipe *pi; + pid_t childpid; + + attributes = WUNTRACED; + if (fg_pipe==NULL) { + attributes |= WNOHANG; + } + + while ((childpid = waitpid(-1, &status, attributes)) > 0) { + if (fg_pipe) { + int i, rcode = 0; + for (i=0; i < fg_pipe->num_progs; i++) { + if (fg_pipe->progs[i].pid == childpid) { + if (i==fg_pipe->num_progs-1) + rcode=WEXITSTATUS(status); + (fg_pipe->num_progs)--; + return(rcode); + } + } + } + + for (pi = job_list; pi; pi = pi->next) { + prognum = 0; + while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { + prognum++; + } + if (prognum < pi->num_progs) + break; + } + + if(pi==NULL) { + debug_printf("checkjobs: pid %d was not in our list!\n", childpid); + continue; + } + + if (WIFEXITED(status) || WIFSIGNALED(status)) { + /* child exited */ + pi->running_progs--; + pi->progs[prognum].pid = 0; + + if (!pi->running_progs) { + printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); + remove_bg_job(pi); + } + } else { + /* child stopped */ + pi->stopped_progs++; + pi->progs[prognum].is_stopped = 1; + +#if 0 + /* Printing this stuff is a pain, since it tends to + * overwrite the prompt an inconveinient moments. So + * don't do that. */ + if (pi->stopped_progs == pi->num_progs) { + printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); + } +#endif + } + } + + if (childpid == -1 && errno != ECHILD) + perror_msg("waitpid"); + + /* move the shell to the foreground */ + /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ + /* perror_msg("tcsetpgrp-2"); */ + return -1; +} + +/* Figure out our controlling tty, checking in order stderr, + * stdin, and stdout. If check_pgrp is set, also check that + * we belong to the foreground process group associated with + * that tty. The value of shell_terminal is needed in order to call + * tcsetpgrp(shell_terminal, ...); */ +void controlling_tty(int check_pgrp) +{ + pid_t curpgrp; + + if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 + && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 + && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) + goto shell_terminal_error; + + if (check_pgrp && curpgrp != getpgid(0)) + goto shell_terminal_error; + + return; + +shell_terminal_error: + shell_terminal = -1; + return; +} +#endif + +/* run_pipe_real() starts all the jobs, but doesn't wait for anything + * to finish. See checkjobs(). + * + * return code is normally -1, when the caller has to wait for children + * to finish to determine the exit status of the pipe. If the pipe + * is a simple builtin command, however, the action is done by the + * time run_pipe_real returns, and the exit code is provided as the + * return value. + * + * The input of the pipe is always stdin, the output is always + * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, + * because it tries to avoid running the command substitution in + * subshell, when that is in fact necessary. The subshell process + * now has its stdout directed to the input of the appropriate pipe, + * so this routine is noticeably simpler. + */ +static int run_pipe_real(struct pipe *pi) +{ + int i; +#ifndef __U_BOOT__ + int nextin, nextout; + int pipefds[2]; /* pipefds[0] is for reading */ + struct child_prog *child; + struct built_in_command *x; + char *p; +# if __GNUC__ + /* Avoid longjmp clobbering */ + (void) &i; + (void) &nextin; + (void) &nextout; + (void) &child; +# endif +#else + int nextin; + int flag = do_repeat ? CMD_FLAG_REPEAT : 0; + struct child_prog *child; + char *p; +# if __GNUC__ + /* Avoid longjmp clobbering */ + (void) &i; + (void) &nextin; + (void) &child; +# endif +#endif /* __U_BOOT__ */ + + nextin = 0; +#ifndef __U_BOOT__ + pi->pgrp = -1; +#endif + + /* Check if this is a simple builtin (not part of a pipe). + * Builtins within pipes have to fork anyway, and are handled in + * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. + */ + if (pi->num_progs == 1) child = & (pi->progs[0]); +#ifndef __U_BOOT__ + if (pi->num_progs == 1 && child->group && child->subshell == 0) { + int squirrel[] = {-1, -1, -1}; + int rcode; + debug_printf("non-subshell grouping\n"); + setup_redirects(child, squirrel); + /* XXX could we merge code with following builtin case, + * by creating a pseudo builtin that calls run_list_real? */ + rcode = run_list_real(child->group); + restore_redirects(squirrel); +#else + if (pi->num_progs == 1 && child->group) { + int rcode; + debug_printf("non-subshell grouping\n"); + rcode = run_list_real(child->group); +#endif + return rcode; + } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { + for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } + if (i!=0 && child->argv[i]==NULL) { + /* assignments, but no command: set the local environment */ + for (i=0; child->argv[i]!=NULL; i++) { + + /* Ok, this case is tricky. We have to decide if this is a + * local variable, or an already exported variable. If it is + * already exported, we have to export the new value. If it is + * not exported, we need only set this as a local variable. + * This junk is all to decide whether or not to export this + * variable. */ + int export_me=0; + char *name, *value; + name = xstrdup(child->argv[i]); + debug_printf("Local environment set: %s\n", name); + value = strchr(name, '='); + if (value) + *value=0; +#ifndef __U_BOOT__ + if ( get_local_var(name)) { + export_me=1; + } +#endif + free(name); + p = insert_var_value(child->argv[i]); + set_local_var(p, export_me); + if (p != child->argv[i]) free(p); + } + return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ + } + for (i = 0; is_assignment(child->argv[i]); i++) { + p = insert_var_value(child->argv[i]); +#ifndef __U_BOOT__ + putenv(strdup(p)); +#else + set_local_var(p, 0); +#endif + if (p != child->argv[i]) { + child->sp--; + free(p); + } + } + if (child->sp) { + char * str = NULL; + + str = make_string(child->argv + i, + child->argv_nonnull + i); + parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); + free(str); + return last_return_code; + } +#ifndef __U_BOOT__ + for (x = bltins; x->cmd; x++) { + if (strcmp(child->argv[i], x->cmd) == 0 ) { + int squirrel[] = {-1, -1, -1}; + int rcode; + if (x->function == builtin_exec && child->argv[i+1]==NULL) { + debug_printf("magic exec\n"); + setup_redirects(child,NULL); + return EXIT_SUCCESS; + } + debug_printf("builtin inline %s\n", child->argv[0]); + /* XXX setup_redirects acts on file descriptors, not FILEs. + * This is perfect for work that comes after exec(). + * Is it really safe for inline use? Experimentally, + * things seem to work with glibc. */ + setup_redirects(child, squirrel); + + child->argv += i; /* XXX horrible hack */ + rcode = x->function(child); + /* XXX restore hack so free() can work right */ + child->argv -= i; + restore_redirects(squirrel); + } + return rcode; + } +#else + /* check ";", because ,example , argv consist from + * "help;flinfo" must not execute + */ + if (strchr(child->argv[i], ';')) { + printf("Unknown command '%s' - try 'help' or use " + "'run' command\n", child->argv[i]); + return -1; + } + /* Process the command */ + return cmd_process(flag, child->argc, child->argv, + &flag_repeat, NULL); +#endif + } +#ifndef __U_BOOT__ + + for (i = 0; i < pi->num_progs; i++) { + child = & (pi->progs[i]); + + /* pipes are inserted between pairs of commands */ + if ((i + 1) < pi->num_progs) { + if (pipe(pipefds)<0) perror_msg_and_die("pipe"); + nextout = pipefds[1]; + } else { + nextout=1; + pipefds[0] = -1; + } + + /* XXX test for failed fork()? */ + if (!(child->pid = fork())) { + /* Set the handling for job control signals back to the default. */ + signal(SIGINT, SIG_DFL); + signal(SIGQUIT, SIG_DFL); + signal(SIGTERM, SIG_DFL); + signal(SIGTSTP, SIG_DFL); + signal(SIGTTIN, SIG_DFL); + signal(SIGTTOU, SIG_DFL); + signal(SIGCHLD, SIG_DFL); + + close_all(); + + if (nextin != 0) { + dup2(nextin, 0); + close(nextin); + } + if (nextout != 1) { + dup2(nextout, 1); + close(nextout); + } + if (pipefds[0]!=-1) { + close(pipefds[0]); /* opposite end of our output pipe */ + } + + /* Like bash, explicit redirects override pipes, + * and the pipe fd is available for dup'ing. */ + setup_redirects(child,NULL); + + if (interactive && pi->followup!=PIPE_BG) { + /* If we (the child) win the race, put ourselves in the process + * group whose leader is the first process in this pipe. */ + if (pi->pgrp < 0) { + pi->pgrp = getpid(); + } + if (setpgid(0, pi->pgrp) == 0) { + tcsetpgrp(2, pi->pgrp); + } + } + + pseudo_exec(child); + } + + + /* put our child in the process group whose leader is the + first process in this pipe */ + if (pi->pgrp < 0) { + pi->pgrp = child->pid; + } + /* Don't check for errors. The child may be dead already, + * in which case setpgid returns error code EACCES. */ + setpgid(child->pid, pi->pgrp); + + if (nextin != 0) + close(nextin); + if (nextout != 1) + close(nextout); + + /* If there isn't another process, nextin is garbage + but it doesn't matter */ + nextin = pipefds[0]; + } +#endif + return -1; +} + +static int run_list_real(struct pipe *pi) +{ + char *save_name = NULL; + char **list = NULL; + char **save_list = NULL; + struct pipe *rpipe; + int flag_rep = 0; +#ifndef __U_BOOT__ + int save_num_progs; +#endif + int rcode=0, flag_skip=1; + int flag_restore = 0; + int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ + reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; + /* check syntax for "for" */ + for (rpipe = pi; rpipe; rpipe = rpipe->next) { + if ((rpipe->r_mode == RES_IN || + rpipe->r_mode == RES_FOR) && + (rpipe->next == NULL)) { + syntax(); +#ifdef __U_BOOT__ + flag_repeat = 0; +#endif + return 1; + } + if ((rpipe->r_mode == RES_IN && + (rpipe->next->r_mode == RES_IN && + rpipe->next->progs->argv != NULL))|| + (rpipe->r_mode == RES_FOR && + rpipe->next->r_mode != RES_IN)) { + syntax(); +#ifdef __U_BOOT__ + flag_repeat = 0; +#endif + return 1; + } + } + for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { + if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || + pi->r_mode == RES_FOR) { +#ifdef __U_BOOT__ + /* check Ctrl-C */ + ctrlc(); + if ((had_ctrlc())) { + return 1; + } +#endif + flag_restore = 0; + if (!rpipe) { + flag_rep = 0; + rpipe = pi; + } + } + rmode = pi->r_mode; + debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode); + if (rmode == skip_more_in_this_rmode && flag_skip) { + if (pi->followup == PIPE_SEQ) flag_skip=0; + continue; + } + flag_skip = 1; + skip_more_in_this_rmode = RES_XXXX; + if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; + if (rmode == RES_THEN && if_code) continue; + if (rmode == RES_ELSE && !if_code) continue; + if (rmode == RES_ELIF && !if_code) break; + if (rmode == RES_FOR && pi->num_progs) { + if (!list) { + /* if no variable values after "in" we skip "for" */ + if (!pi->next->progs->argv) continue; + /* create list of variable values */ + list = make_list_in(pi->next->progs->argv, + pi->progs->argv[0]); + save_list = list; + save_name = pi->progs->argv[0]; + pi->progs->argv[0] = NULL; + flag_rep = 1; + } + if (!(*list)) { + free(pi->progs->argv[0]); + free(save_list); + list = NULL; + flag_rep = 0; + pi->progs->argv[0] = save_name; +#ifndef __U_BOOT__ + pi->progs->glob_result.gl_pathv[0] = + pi->progs->argv[0]; +#endif + continue; + } else { + /* insert new value from list for variable */ + if (pi->progs->argv[0]) + free(pi->progs->argv[0]); + pi->progs->argv[0] = *list++; +#ifndef __U_BOOT__ + pi->progs->glob_result.gl_pathv[0] = + pi->progs->argv[0]; +#endif + } + } + if (rmode == RES_IN) continue; + if (rmode == RES_DO) { + if (!flag_rep) continue; + } + if ((rmode == RES_DONE)) { + if (flag_rep) { + flag_restore = 1; + } else { + rpipe = NULL; + } + } + if (pi->num_progs == 0) continue; +#ifndef __U_BOOT__ + save_num_progs = pi->num_progs; /* save number of programs */ +#endif + rcode = run_pipe_real(pi); + debug_printf("run_pipe_real returned %d\n",rcode); +#ifndef __U_BOOT__ + if (rcode!=-1) { + /* We only ran a builtin: rcode was set by the return value + * of run_pipe_real(), and we don't need to wait for anything. */ + } else if (pi->followup==PIPE_BG) { + /* XXX check bash's behavior with nontrivial pipes */ + /* XXX compute jobid */ + /* XXX what does bash do with attempts to background builtins? */ + insert_bg_job(pi); + rcode = EXIT_SUCCESS; + } else { + if (interactive) { + /* move the new process group into the foreground */ + if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) + perror_msg("tcsetpgrp-3"); + rcode = checkjobs(pi); + /* move the shell to the foreground */ + if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) + perror_msg("tcsetpgrp-4"); + } else { + rcode = checkjobs(pi); + } + debug_printf("checkjobs returned %d\n",rcode); + } + last_return_code=rcode; +#else + if (rcode < -1) { + last_return_code = -rcode - 2; + return -2; /* exit */ + } + last_return_code=(rcode == 0) ? 0 : 1; +#endif +#ifndef __U_BOOT__ + pi->num_progs = save_num_progs; /* restore number of programs */ +#endif + if ( rmode == RES_IF || rmode == RES_ELIF ) + next_if_code=rcode; /* can be overwritten a number of times */ + if (rmode == RES_WHILE) + flag_rep = !last_return_code; + if (rmode == RES_UNTIL) + flag_rep = last_return_code; + if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || + (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) + skip_more_in_this_rmode=rmode; +#ifndef __U_BOOT__ + checkjobs(NULL); +#endif + } + return rcode; +} + +/* broken, of course, but OK for testing */ +static char *indenter(int i) +{ + static char blanks[]=" "; + return &blanks[sizeof(blanks)-i-1]; +} + +/* return code is the exit status of the pipe */ +static int free_pipe(struct pipe *pi, int indent) +{ + char **p; + struct child_prog *child; +#ifndef __U_BOOT__ + struct redir_struct *r, *rnext; +#endif + int a, i, ret_code=0; + char *ind = indenter(indent); + +#ifndef __U_BOOT__ + if (pi->stopped_progs > 0) + return ret_code; + final_printf("%s run pipe: (pid %d)\n",ind,getpid()); +#endif + for (i=0; inum_progs; i++) { + child = &pi->progs[i]; + final_printf("%s command %d:\n",ind,i); + if (child->argv) { + for (a=0,p=child->argv; *p; a++,p++) { + final_printf("%s argv[%d] = %s\n",ind,a,*p); + } +#ifndef __U_BOOT__ + globfree(&child->glob_result); +#else + for (a = 0; a < child->argc; a++) { + free(child->argv[a]); + } + free(child->argv); + free(child->argv_nonnull); + child->argc = 0; +#endif + child->argv=NULL; + } else if (child->group) { +#ifndef __U_BOOT__ + final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); +#endif + ret_code = free_pipe_list(child->group,indent+3); + final_printf("%s end group\n",ind); + } else { + final_printf("%s (nil)\n",ind); + } +#ifndef __U_BOOT__ + for (r=child->redirects; r; r=rnext) { + final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); + if (r->dup == -1) { + /* guard against the case >$FOO, where foo is unset or blank */ + if (r->word.gl_pathv) { + final_printf(" %s\n", *r->word.gl_pathv); + globfree(&r->word); + } + } else { + final_printf("&%d\n", r->dup); + } + rnext=r->next; + free(r); + } + child->redirects=NULL; +#endif + } + free(pi->progs); /* children are an array, they get freed all at once */ + pi->progs=NULL; + return ret_code; +} + +static int free_pipe_list(struct pipe *head, int indent) +{ + int rcode=0; /* if list has no members */ + struct pipe *pi, *next; + char *ind = indenter(indent); + for (pi=head; pi; pi=next) { + final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); + rcode = free_pipe(pi, indent); + final_printf("%s pipe followup code %d\n", ind, pi->followup); + next=pi->next; + pi->next=NULL; + free(pi); + } + return rcode; +} + +/* Select which version we will use */ +static int run_list(struct pipe *pi) +{ + int rcode=0; +#ifndef __U_BOOT__ + if (fake_mode==0) { +#endif + rcode = run_list_real(pi); +#ifndef __U_BOOT__ + } +#endif + /* free_pipe_list has the side effect of clearing memory + * In the long run that function can be merged with run_list_real, + * but doing that now would hobble the debugging effort. */ + free_pipe_list(pi,0); + return rcode; +} + +/* The API for glob is arguably broken. This routine pushes a non-matching + * string into the output structure, removing non-backslashed backslashes. + * If someone can prove me wrong, by performing this function within the + * original glob(3) api, feel free to rewrite this routine into oblivion. + * Return code (0 vs. GLOB_NOSPACE) matches glob(3). + * XXX broken if the last character is '\\', check that before calling. + */ +#ifndef __U_BOOT__ +static int globhack(const char *src, int flags, glob_t *pglob) +{ + int cnt=0, pathc; + const char *s; + char *dest; + for (cnt=1, s=src; s && *s; s++) { + if (*s == '\\') s++; + cnt++; + } + dest = malloc(cnt); + if (!dest) return GLOB_NOSPACE; + if (!(flags & GLOB_APPEND)) { + pglob->gl_pathv=NULL; + pglob->gl_pathc=0; + pglob->gl_offs=0; + pglob->gl_offs=0; + } + pathc = ++pglob->gl_pathc; + pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); + if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; + pglob->gl_pathv[pathc-1]=dest; + pglob->gl_pathv[pathc]=NULL; + for (s=src; s && *s; s++, dest++) { + if (*s == '\\') s++; + *dest = *s; + } + *dest='\0'; + return 0; +} + +/* XXX broken if the last character is '\\', check that before calling */ +static int glob_needed(const char *s) +{ + for (; *s; s++) { + if (*s == '\\') s++; + if (strchr("*[?",*s)) return 1; + } + return 0; +} + +#if 0 +static void globprint(glob_t *pglob) +{ + int i; + debug_printf("glob_t at %p:\n", pglob); + debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", + pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); + for (i=0; igl_pathc; i++) + debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, + pglob->gl_pathv[i], pglob->gl_pathv[i]); +} +#endif + +static int xglob(o_string *dest, int flags, glob_t *pglob) +{ + int gr; + + /* short-circuit for null word */ + /* we can code this better when the debug_printf's are gone */ + if (dest->length == 0) { + if (dest->nonnull) { + /* bash man page calls this an "explicit" null */ + gr = globhack(dest->data, flags, pglob); + debug_printf("globhack returned %d\n",gr); + } else { + return 0; + } + } else if (glob_needed(dest->data)) { + gr = glob(dest->data, flags, NULL, pglob); + debug_printf("glob returned %d\n",gr); + if (gr == GLOB_NOMATCH) { + /* quote removal, or more accurately, backslash removal */ + gr = globhack(dest->data, flags, pglob); + debug_printf("globhack returned %d\n",gr); + } + } else { + gr = globhack(dest->data, flags, pglob); + debug_printf("globhack returned %d\n",gr); + } + if (gr == GLOB_NOSPACE) + error_msg_and_die("out of memory during glob"); + if (gr != 0) { /* GLOB_ABORTED ? */ + error_msg("glob(3) error %d",gr); + } + /* globprint(glob_target); */ + return gr; +} +#endif + +#ifdef __U_BOOT__ +static char *get_dollar_var(char ch); +#endif + +/* This is used to get/check local shell variables */ +char *get_local_var(const char *s) +{ + struct variables *cur; + + if (!s) + return NULL; + +#ifdef __U_BOOT__ + if (*s == '$') + return get_dollar_var(s[1]); +#endif + + for (cur = top_vars; cur; cur=cur->next) + if(strcmp(cur->name, s)==0) + return cur->value; + return NULL; +} + +/* This is used to set local shell variables + flg_export==0 if only local (not exporting) variable + flg_export==1 if "new" exporting environ + flg_export>1 if current startup environ (not call putenv()) */ +int set_local_var(const char *s, int flg_export) +{ + char *name, *value; + int result=0; + struct variables *cur; + +#ifdef __U_BOOT__ + /* might be possible! */ + if (!isalpha(*s)) + return -1; +#endif + + name=strdup(s); + +#ifdef __U_BOOT__ + if (getenv(name) != NULL) { + printf ("ERROR: " + "There is a global environment variable with the same name.\n"); + free(name); + return -1; + } +#endif + /* Assume when we enter this function that we are already in + * NAME=VALUE format. So the first order of business is to + * split 's' on the '=' into 'name' and 'value' */ + value = strchr(name, '='); + if (value == NULL && ++value == NULL) { + free(name); + return -1; + } + *value++ = 0; + + for(cur = top_vars; cur; cur = cur->next) { + if(strcmp(cur->name, name)==0) + break; + } + + if(cur) { + if(strcmp(cur->value, value)==0) { + if(flg_export>0 && cur->flg_export==0) + cur->flg_export=flg_export; + else + result++; + } else { + if(cur->flg_read_only) { + error_msg("%s: readonly variable", name); + result = -1; + } else { + if(flg_export>0 || cur->flg_export>1) + cur->flg_export=1; + free(cur->value); + + cur->value = strdup(value); + } + } + } else { + cur = malloc(sizeof(struct variables)); + if(!cur) { + result = -1; + } else { + cur->name = strdup(name); + if (cur->name == NULL) { + free(cur); + result = -1; + } else { + struct variables *bottom = top_vars; + cur->value = strdup(value); + cur->next = NULL; + cur->flg_export = flg_export; + cur->flg_read_only = 0; + while(bottom->next) bottom=bottom->next; + bottom->next = cur; + } + } + } + +#ifndef __U_BOOT__ + if(result==0 && cur->flg_export==1) { + *(value-1) = '='; + result = putenv(name); + } else { +#endif + free(name); +#ifndef __U_BOOT__ + if(result>0) /* equivalent to previous set */ + result = 0; + } +#endif + return result; +} + +void unset_local_var(const char *name) +{ + struct variables *cur; + + if (name) { + for (cur = top_vars; cur; cur=cur->next) { + if(strcmp(cur->name, name)==0) + break; + } + if (cur != NULL) { + struct variables *next = top_vars; + if(cur->flg_read_only) { + error_msg("%s: readonly variable", name); + return; + } else { +#ifndef __U_BOOT__ + if(cur->flg_export) + unsetenv(cur->name); +#endif + free(cur->name); + free(cur->value); + while (next->next != cur) + next = next->next; + next->next = cur->next; + } + free(cur); + } + } +} + +static int is_assignment(const char *s) +{ + if (s == NULL) + return 0; + + if (!isalpha(*s)) return 0; + ++s; + while(isalnum(*s) || *s=='_') ++s; + return *s=='='; +} + +#ifndef __U_BOOT__ +/* the src parameter allows us to peek forward to a possible &n syntax + * for file descriptor duplication, e.g., "2>&1". + * Return code is 0 normally, 1 if a syntax error is detected in src. + * Resource errors (in xmalloc) cause the process to exit */ +static int setup_redirect(struct p_context *ctx, int fd, redir_type style, + struct in_str *input) +{ + struct child_prog *child=ctx->child; + struct redir_struct *redir = child->redirects; + struct redir_struct *last_redir=NULL; + + /* Create a new redir_struct and drop it onto the end of the linked list */ + while(redir) { + last_redir=redir; + redir=redir->next; + } + redir = xmalloc(sizeof(struct redir_struct)); + redir->next=NULL; + redir->word.gl_pathv=NULL; + if (last_redir) { + last_redir->next=redir; + } else { + child->redirects=redir; + } + + redir->type=style; + redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; + + debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); + + /* Check for a '2>&1' type redirect */ + redir->dup = redirect_dup_num(input); + if (redir->dup == -2) return 1; /* syntax error */ + if (redir->dup != -1) { + /* Erik had a check here that the file descriptor in question + * is legit; I postpone that to "run time" + * A "-" representation of "close me" shows up as a -3 here */ + debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); + } else { + /* We do _not_ try to open the file that src points to, + * since we need to return and let src be expanded first. + * Set ctx->pending_redirect, so we know what to do at the + * end of the next parsed word. + */ + ctx->pending_redirect = redir; + } + return 0; +} +#endif + +static struct pipe *new_pipe(void) +{ + struct pipe *pi; + pi = xmalloc(sizeof(struct pipe)); + pi->num_progs = 0; + pi->progs = NULL; + pi->next = NULL; + pi->followup = 0; /* invalid */ + pi->r_mode = RES_NONE; + return pi; +} + +static void initialize_context(struct p_context *ctx) +{ + ctx->pipe=NULL; +#ifndef __U_BOOT__ + ctx->pending_redirect=NULL; +#endif + ctx->child=NULL; + ctx->list_head=new_pipe(); + ctx->pipe=ctx->list_head; + ctx->w=RES_NONE; + ctx->stack=NULL; +#ifdef __U_BOOT__ + ctx->old_flag=0; +#endif + done_command(ctx); /* creates the memory for working child */ +} + +/* normal return is 0 + * if a reserved word is found, and processed, return 1 + * should handle if, then, elif, else, fi, for, while, until, do, done. + * case, function, and select are obnoxious, save those for later. + */ +struct reserved_combo { + char *literal; + int code; + long flag; +}; +/* Mostly a list of accepted follow-up reserved words. + * FLAG_END means we are done with the sequence, and are ready + * to turn the compound list into a command. + * FLAG_START means the word must start a new compound list. + */ +static struct reserved_combo reserved_list[] = { + { "if", RES_IF, FLAG_THEN | FLAG_START }, + { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, + { "elif", RES_ELIF, FLAG_THEN }, + { "else", RES_ELSE, FLAG_FI }, + { "fi", RES_FI, FLAG_END }, + { "for", RES_FOR, FLAG_IN | FLAG_START }, + { "while", RES_WHILE, FLAG_DO | FLAG_START }, + { "until", RES_UNTIL, FLAG_DO | FLAG_START }, + { "in", RES_IN, FLAG_DO }, + { "do", RES_DO, FLAG_DONE }, + { "done", RES_DONE, FLAG_END } +}; +#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) + +static int reserved_word(o_string *dest, struct p_context *ctx) +{ + struct reserved_combo *r; + for (r=reserved_list; + rdata, r->literal) == 0) { + debug_printf("found reserved word %s, code %d\n",r->literal,r->code); + if (r->flag & FLAG_START) { + struct p_context *new = xmalloc(sizeof(struct p_context)); + debug_printf("push stack\n"); + if (ctx->w == RES_IN || ctx->w == RES_FOR) { + syntax(); + free(new); + ctx->w = RES_SNTX; + b_reset(dest); + return 1; + } + *new = *ctx; /* physical copy */ + initialize_context(ctx); + ctx->stack=new; + } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<code))) { + syntax(); + ctx->w = RES_SNTX; + b_reset(dest); + return 1; + } + ctx->w=r->code; + ctx->old_flag = r->flag; + if (ctx->old_flag & FLAG_END) { + struct p_context *old; + debug_printf("pop stack\n"); + done_pipe(ctx,PIPE_SEQ); + old = ctx->stack; + old->child->group = ctx->list_head; +#ifndef __U_BOOT__ + old->child->subshell = 0; +#endif + *ctx = *old; /* physical copy */ + free(old); + } + b_reset (dest); + return 1; + } + } + return 0; +} + +/* normal return is 0. + * Syntax or xglob errors return 1. */ +static int done_word(o_string *dest, struct p_context *ctx) +{ + struct child_prog *child=ctx->child; +#ifndef __U_BOOT__ + glob_t *glob_target; + int gr, flags = 0; +#else + char *str, *s; + int argc, cnt; +#endif + + debug_printf("done_word: %s %p\n", dest->data, child); + if (dest->length == 0 && !dest->nonnull) { + debug_printf(" true null, ignored\n"); + return 0; + } +#ifndef __U_BOOT__ + if (ctx->pending_redirect) { + glob_target = &ctx->pending_redirect->word; + } else { +#endif + if (child->group) { + syntax(); + return 1; /* syntax error, groups and arglists don't mix */ + } + if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { + debug_printf("checking %s for reserved-ness\n",dest->data); + if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; + } +#ifndef __U_BOOT__ + glob_target = &child->glob_result; + if (child->argv) flags |= GLOB_APPEND; +#else + for (cnt = 1, s = dest->data; s && *s; s++) { + if (*s == '\\') s++; + cnt++; + } + str = malloc(cnt); + if (!str) return 1; + if ( child->argv == NULL) { + child->argc=0; + } + argc = ++child->argc; + child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); + if (child->argv == NULL) return 1; + child->argv_nonnull = realloc(child->argv_nonnull, + (argc+1)*sizeof(*child->argv_nonnull)); + if (child->argv_nonnull == NULL) + return 1; + child->argv[argc-1]=str; + child->argv_nonnull[argc-1] = dest->nonnull; + child->argv[argc]=NULL; + child->argv_nonnull[argc] = 0; + for (s = dest->data; s && *s; s++,str++) { + if (*s == '\\') s++; + *str = *s; + } + *str = '\0'; +#endif +#ifndef __U_BOOT__ + } + gr = xglob(dest, flags, glob_target); + if (gr != 0) return 1; +#endif + + b_reset(dest); +#ifndef __U_BOOT__ + if (ctx->pending_redirect) { + ctx->pending_redirect=NULL; + if (glob_target->gl_pathc != 1) { + error_msg("ambiguous redirect"); + return 1; + } + } else { + child->argv = glob_target->gl_pathv; + } +#endif + if (ctx->w == RES_FOR) { + done_word(dest,ctx); + done_pipe(ctx,PIPE_SEQ); + } + return 0; +} + +/* The only possible error here is out of memory, in which case + * xmalloc exits. */ +static int done_command(struct p_context *ctx) +{ + /* The child is really already in the pipe structure, so + * advance the pipe counter and make a new, null child. + * Only real trickiness here is that the uncommitted + * child structure, to which ctx->child points, is not + * counted in pi->num_progs. */ + struct pipe *pi=ctx->pipe; + struct child_prog *prog=ctx->child; + + if (prog && prog->group == NULL + && prog->argv == NULL +#ifndef __U_BOOT__ + && prog->redirects == NULL) { +#else + ) { +#endif + debug_printf("done_command: skipping null command\n"); + return 0; + } else if (prog) { + pi->num_progs++; + debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); + } else { + debug_printf("done_command: initializing\n"); + } + pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); + + prog = pi->progs + pi->num_progs; +#ifndef __U_BOOT__ + prog->redirects = NULL; +#endif + prog->argv = NULL; + prog->argv_nonnull = NULL; +#ifndef __U_BOOT__ + prog->is_stopped = 0; +#endif + prog->group = NULL; +#ifndef __U_BOOT__ + prog->glob_result.gl_pathv = NULL; + prog->family = pi; +#endif + prog->sp = 0; + ctx->child = prog; + prog->type = ctx->type; + + /* but ctx->pipe and ctx->list_head remain unchanged */ + return 0; +} + +static int done_pipe(struct p_context *ctx, pipe_style type) +{ + struct pipe *new_p; + done_command(ctx); /* implicit closure of previous command */ + debug_printf("done_pipe, type %d\n", type); + ctx->pipe->followup = type; + ctx->pipe->r_mode = ctx->w; + new_p=new_pipe(); + ctx->pipe->next = new_p; + ctx->pipe = new_p; + ctx->child = NULL; + done_command(ctx); /* set up new pipe to accept commands */ + return 0; +} + +#ifndef __U_BOOT__ +/* peek ahead in the in_str to find out if we have a "&n" construct, + * as in "2>&1", that represents duplicating a file descriptor. + * returns either -2 (syntax error), -1 (no &), or the number found. + */ +static int redirect_dup_num(struct in_str *input) +{ + int ch, d=0, ok=0; + ch = b_peek(input); + if (ch != '&') return -1; + + b_getch(input); /* get the & */ + ch=b_peek(input); + if (ch == '-') { + b_getch(input); + return -3; /* "-" represents "close me" */ + } + while (isdigit(ch)) { + d = d*10+(ch-'0'); + ok=1; + b_getch(input); + ch = b_peek(input); + } + if (ok) return d; + + error_msg("ambiguous redirect"); + return -2; +} + +/* If a redirect is immediately preceded by a number, that number is + * supposed to tell which file descriptor to redirect. This routine + * looks for such preceding numbers. In an ideal world this routine + * needs to handle all the following classes of redirects... + * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo + * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo + * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo + * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo + * A -1 output from this program means no valid number was found, so the + * caller should use the appropriate default for this redirection. + */ +static int redirect_opt_num(o_string *o) +{ + int num; + + if (o->length==0) return -1; + for(num=0; numlength; num++) { + if (!isdigit(*(o->data+num))) { + return -1; + } + } + /* reuse num (and save an int) */ + num=atoi(o->data); + b_reset(o); + return num; +} + +FILE *generate_stream_from_list(struct pipe *head) +{ + FILE *pf; +#if 1 + int pid, channel[2]; + if (pipe(channel)<0) perror_msg_and_die("pipe"); + pid=fork(); + if (pid<0) { + perror_msg_and_die("fork"); + } else if (pid==0) { + close(channel[0]); + if (channel[1] != 1) { + dup2(channel[1],1); + close(channel[1]); + } +#if 0 +#define SURROGATE "surrogate response" + write(1,SURROGATE,sizeof(SURROGATE)); + _exit(run_list(head)); +#else + _exit(run_list_real(head)); /* leaks memory */ +#endif + } + debug_printf("forked child %d\n",pid); + close(channel[1]); + pf = fdopen(channel[0],"r"); + debug_printf("pipe on FILE *%p\n",pf); +#else + free_pipe_list(head,0); + pf=popen("echo surrogate response","r"); + debug_printf("started fake pipe on FILE *%p\n",pf); +#endif + return pf; +} + +/* this version hacked for testing purposes */ +/* return code is exit status of the process that is run. */ +static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) +{ + int retcode; + o_string result=NULL_O_STRING; + struct p_context inner; + FILE *p; + struct in_str pipe_str; + initialize_context(&inner); + + /* recursion to generate command */ + retcode = parse_stream(&result, &inner, input, subst_end); + if (retcode != 0) return retcode; /* syntax error or EOF */ + done_word(&result, &inner); + done_pipe(&inner, PIPE_SEQ); + b_free(&result); + + p=generate_stream_from_list(inner.list_head); + if (p==NULL) return 1; + mark_open(fileno(p)); + setup_file_in_str(&pipe_str, p); + + /* now send results of command back into original context */ + retcode = parse_stream(dest, ctx, &pipe_str, '\0'); + /* XXX In case of a syntax error, should we try to kill the child? + * That would be tough to do right, so just read until EOF. */ + if (retcode == 1) { + while (b_getch(&pipe_str)!=EOF) { /* discard */ }; + } + + debug_printf("done reading from pipe, pclose()ing\n"); + /* This is the step that wait()s for the child. Should be pretty + * safe, since we just read an EOF from its stdout. We could try + * to better, by using wait(), and keeping track of background jobs + * at the same time. That would be a lot of work, and contrary + * to the KISS philosophy of this program. */ + mark_closed(fileno(p)); + retcode=pclose(p); + free_pipe_list(inner.list_head,0); + debug_printf("pclosed, retcode=%d\n",retcode); + /* XXX this process fails to trim a single trailing newline */ + return retcode; +} + +static int parse_group(o_string *dest, struct p_context *ctx, + struct in_str *input, int ch) +{ + int rcode, endch=0; + struct p_context sub; + struct child_prog *child = ctx->child; + if (child->argv) { + syntax(); + return 1; /* syntax error, groups and arglists don't mix */ + } + initialize_context(&sub); + switch(ch) { + case '(': endch=')'; child->subshell=1; break; + case '{': endch='}'; break; + default: syntax(); /* really logic error */ + } + rcode=parse_stream(dest,&sub,input,endch); + done_word(dest,&sub); /* finish off the final word in the subcontext */ + done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ + child->group = sub.list_head; + return rcode; + /* child remains "open", available for possible redirects */ +} +#endif + +/* basically useful version until someone wants to get fancier, + * see the bash man page under "Parameter Expansion" */ +static char *lookup_param(char *src) +{ + char *p; + char *sep; + char *default_val = NULL; + int assign = 0; + int expand_empty = 0; + + if (!src) + return NULL; + + sep = strchr(src, ':'); + + if (sep) { + *sep = '\0'; + if (*(sep + 1) == '-') + default_val = sep+2; + if (*(sep + 1) == '=') { + default_val = sep+2; + assign = 1; + } + if (*(sep + 1) == '+') { + default_val = sep+2; + expand_empty = 1; + } + } + + p = getenv(src); + if (!p) + p = get_local_var(src); + + if (!p || strlen(p) == 0) { + p = default_val; + if (assign) { + char *var = malloc(strlen(src)+strlen(default_val)+2); + if (var) { + sprintf(var, "%s=%s", src, default_val); + set_local_var(var, 0); + } + free(var); + } + } else if (expand_empty) { + p += strlen(p); + } + + if (sep) + *sep = ':'; + + return p; +} + +#ifdef __U_BOOT__ +static char *get_dollar_var(char ch) +{ + static char buf[40]; + + buf[0] = '\0'; + switch (ch) { + case '?': + sprintf(buf, "%u", (unsigned int)last_return_code); + break; + default: + return NULL; + } + return buf; +} +#endif + +/* return code: 0 for OK, 1 for syntax error */ +static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) +{ +#ifndef __U_BOOT__ + int i, advance=0; +#else + int advance=0; +#endif +#ifndef __U_BOOT__ + char sep[]=" "; +#endif + int ch = input->peek(input); /* first character after the $ */ + debug_printf("handle_dollar: ch=%c\n",ch); + if (isalpha(ch)) { + b_addchr(dest, SPECIAL_VAR_SYMBOL); + ctx->child->sp++; + while(ch=b_peek(input),isalnum(ch) || ch=='_') { + b_getch(input); + b_addchr(dest,ch); + } + b_addchr(dest, SPECIAL_VAR_SYMBOL); +#ifndef __U_BOOT__ + } else if (isdigit(ch)) { + i = ch-'0'; /* XXX is $0 special? */ + if (i 0) b_adduint(dest, last_bg_pid); + advance = 1; + break; +#endif + case '?': +#ifndef __U_BOOT__ + b_adduint(dest,last_return_code); +#else + ctx->child->sp++; + b_addchr(dest, SPECIAL_VAR_SYMBOL); + b_addchr(dest, '$'); + b_addchr(dest, '?'); + b_addchr(dest, SPECIAL_VAR_SYMBOL); +#endif + advance = 1; + break; +#ifndef __U_BOOT__ + case '#': + b_adduint(dest,global_argc ? global_argc-1 : 0); + advance = 1; + break; +#endif + case '{': + b_addchr(dest, SPECIAL_VAR_SYMBOL); + ctx->child->sp++; + b_getch(input); + /* XXX maybe someone will try to escape the '}' */ + while(ch=b_getch(input),ch!=EOF && ch!='}') { + b_addchr(dest,ch); + } + if (ch != '}') { + syntax(); + return 1; + } + b_addchr(dest, SPECIAL_VAR_SYMBOL); + break; +#ifndef __U_BOOT__ + case '(': + b_getch(input); + process_command_subs(dest, ctx, input, ')'); + break; + case '*': + sep[0]=ifs[0]; + for (i=1; iquote); + } + /* Eat the character if the flag was set. If the compiler + * is smart enough, we could substitute "b_getch(input);" + * for all the "advance = 1;" above, and also end up with + * a nice size-optimized program. Hah! That'll be the day. + */ + if (advance) b_getch(input); + return 0; +} + +#ifndef __U_BOOT__ +int parse_string(o_string *dest, struct p_context *ctx, const char *src) +{ + struct in_str foo; + setup_string_in_str(&foo, src); + return parse_stream(dest, ctx, &foo, '\0'); +} +#endif + +/* return code is 0 for normal exit, 1 for syntax error */ +static int parse_stream(o_string *dest, struct p_context *ctx, + struct in_str *input, int end_trigger) +{ + unsigned int ch, m; +#ifndef __U_BOOT__ + int redir_fd; + redir_type redir_style; +#endif + int next; + + /* Only double-quote state is handled in the state variable dest->quote. + * A single-quote triggers a bypass of the main loop until its mate is + * found. When recursing, quote state is passed in via dest->quote. */ + + debug_printf("parse_stream, end_trigger=%d\n",end_trigger); + while ((ch=b_getch(input))!=EOF) { + m = map[ch]; +#ifdef __U_BOOT__ + if (input->__promptme == 0) return 1; +#endif + next = (ch == '\n') ? 0 : b_peek(input); + + debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", + ch >= ' ' ? ch : '.', ch, m, + dest->quote, ctx->stack == NULL ? '*' : '.'); + + if (m==0 || ((m==1 || m==2) && dest->quote)) { + b_addqchr(dest, ch, dest->quote); + } else { + if (m==2) { /* unquoted IFS */ + if (done_word(dest, ctx)) { + return 1; + } + /* If we aren't performing a substitution, treat a newline as a + * command separator. */ + if (end_trigger != '\0' && ch=='\n') + done_pipe(ctx,PIPE_SEQ); + } + if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { + debug_printf("leaving parse_stream (triggered)\n"); + return 0; + } +#if 0 + if (ch=='\n') { + /* Yahoo! Time to run with it! */ + done_pipe(ctx,PIPE_SEQ); + run_list(ctx->list_head); + initialize_context(ctx); + } +#endif + if (m!=2) switch (ch) { + case '#': + if (dest->length == 0 && !dest->quote) { + while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } + } else { + b_addqchr(dest, ch, dest->quote); + } + break; + case '\\': + if (next == EOF) { + syntax(); + return 1; + } + b_addqchr(dest, '\\', dest->quote); + b_addqchr(dest, b_getch(input), dest->quote); + break; + case '$': + if (handle_dollar(dest, ctx, input)!=0) return 1; + break; + case '\'': + dest->nonnull = 1; + while(ch=b_getch(input),ch!=EOF && ch!='\'') { +#ifdef __U_BOOT__ + if(input->__promptme == 0) return 1; +#endif + b_addchr(dest,ch); + } + if (ch==EOF) { + syntax(); + return 1; + } + break; + case '"': + dest->nonnull = 1; + dest->quote = !dest->quote; + break; +#ifndef __U_BOOT__ + case '`': + process_command_subs(dest, ctx, input, '`'); + break; + case '>': + redir_fd = redirect_opt_num(dest); + done_word(dest, ctx); + redir_style=REDIRECT_OVERWRITE; + if (next == '>') { + redir_style=REDIRECT_APPEND; + b_getch(input); + } else if (next == '(') { + syntax(); /* until we support >(list) Process Substitution */ + return 1; + } + setup_redirect(ctx, redir_fd, redir_style, input); + break; + case '<': + redir_fd = redirect_opt_num(dest); + done_word(dest, ctx); + redir_style=REDIRECT_INPUT; + if (next == '<') { + redir_style=REDIRECT_HEREIS; + b_getch(input); + } else if (next == '>') { + redir_style=REDIRECT_IO; + b_getch(input); + } else if (next == '(') { + syntax(); /* until we support <(list) Process Substitution */ + return 1; + } + setup_redirect(ctx, redir_fd, redir_style, input); + break; +#endif + case ';': + done_word(dest, ctx); + done_pipe(ctx,PIPE_SEQ); + break; + case '&': + done_word(dest, ctx); + if (next=='&') { + b_getch(input); + done_pipe(ctx,PIPE_AND); + } else { +#ifndef __U_BOOT__ + done_pipe(ctx,PIPE_BG); +#else + syntax_err(); + return 1; +#endif + } + break; + case '|': + done_word(dest, ctx); + if (next=='|') { + b_getch(input); + done_pipe(ctx,PIPE_OR); + } else { + /* we could pick up a file descriptor choice here + * with redirect_opt_num(), but bash doesn't do it. + * "echo foo 2| cat" yields "foo 2". */ +#ifndef __U_BOOT__ + done_command(ctx); +#else + syntax_err(); + return 1; +#endif + } + break; +#ifndef __U_BOOT__ + case '(': + case '{': + if (parse_group(dest, ctx, input, ch)!=0) return 1; + break; + case ')': + case '}': + syntax(); /* Proper use of this character caught by end_trigger */ + return 1; + break; +#endif + case SUBSTED_VAR_SYMBOL: + dest->nonnull = 1; + while (ch = b_getch(input), ch != EOF && + ch != SUBSTED_VAR_SYMBOL) { + debug_printf("subst, pass=%d\n", ch); + if (input->__promptme == 0) + return 1; + b_addchr(dest, ch); + } + debug_printf("subst, term=%d\n", ch); + if (ch == EOF) { + syntax(); + return 1; + } + break; + default: + syntax(); /* this is really an internal logic error */ + return 1; + } + } + } + /* complain if quote? No, maybe we just finished a command substitution + * that was quoted. Example: + * $ echo "`cat foo` plus more" + * and we just got the EOF generated by the subshell that ran "cat foo" + * The only real complaint is if we got an EOF when end_trigger != '\0', + * that is, we were really supposed to get end_trigger, and never got + * one before the EOF. Can't use the standard "syntax error" return code, + * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ + debug_printf("leaving parse_stream (EOF)\n"); + if (end_trigger != '\0') return -1; + return 0; +} + +static void mapset(const unsigned char *set, int code) +{ + const unsigned char *s; + for (s=set; *s; s++) map[*s] = code; +} + +static void update_ifs_map(void) +{ + /* char *ifs and char map[256] are both globals. */ + ifs = (uchar *)getenv("IFS"); + if (ifs == NULL) ifs=(uchar *)" \t\n"; + /* Precompute a list of 'flow through' behavior so it can be treated + * quickly up front. Computation is necessary because of IFS. + * Special case handling of IFS == " \t\n" is not implemented. + * The map[] array only really needs two bits each, and on most machines + * that would be faster because of the reduced L1 cache footprint. + */ + memset(map,0,sizeof(map)); /* most characters flow through always */ +#ifndef __U_BOOT__ + mapset((uchar *)"\\$'\"`", 3); /* never flow through */ + mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ +#else + { + uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; + mapset(subst, 3); /* never flow through */ + } + mapset((uchar *)"\\$'\"", 3); /* never flow through */ + mapset((uchar *)";&|#", 1); /* flow through if quoted */ +#endif + mapset(ifs, 2); /* also flow through if quoted */ +} + +/* most recursion does not come through here, the exeception is + * from builtin_source() */ +static int parse_stream_outer(struct in_str *inp, int flag) +{ + + struct p_context ctx; + o_string temp=NULL_O_STRING; + int rcode; +#ifdef __U_BOOT__ + int code = 0; +#endif + do { + ctx.type = flag; + initialize_context(&ctx); + update_ifs_map(); + if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); + inp->promptmode=1; + rcode = parse_stream(&temp, &ctx, inp, '\n'); +#ifdef __U_BOOT__ + if (rcode == 1) flag_repeat = 0; +#endif + if (rcode != 1 && ctx.old_flag != 0) { + syntax(); +#ifdef __U_BOOT__ + flag_repeat = 0; +#endif + } + if (rcode != 1 && ctx.old_flag == 0) { + done_word(&temp, &ctx); + done_pipe(&ctx,PIPE_SEQ); +#ifndef __U_BOOT__ + run_list(ctx.list_head); +#else + code = run_list(ctx.list_head); + if (code == -2) { /* exit */ + b_free(&temp); + code = 0; + /* XXX hackish way to not allow exit from main loop */ + if (inp->peek == file_peek) { + printf("exit not allowed from main input shell.\n"); + continue; + } + break; + } + if (code == -1) + flag_repeat = 0; +#endif + } else { + if (ctx.old_flag != 0) { + free(ctx.stack); + b_reset(&temp); + } +#ifdef __U_BOOT__ + if (inp->__promptme == 0) printf("\n"); + inp->__promptme = 1; +#endif + temp.nonnull = 0; + temp.quote = 0; + inp->p = NULL; + free_pipe_list(ctx.list_head,0); + } + b_free(&temp); + } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */ +#ifndef __U_BOOT__ + return 0; +#else + return (code != 0) ? 1 : 0; +#endif /* __U_BOOT__ */ +} + +#ifndef __U_BOOT__ +static int parse_string_outer(const char *s, int flag) +#else +int parse_string_outer(const char *s, int flag) +#endif /* __U_BOOT__ */ +{ + struct in_str input; +#ifdef __U_BOOT__ + char *p = NULL; + int rcode; + if ( !s || !*s) + return 1; + if (!(p = strchr(s, '\n')) || *++p) { + p = xmalloc(strlen(s) + 2); + strcpy(p, s); + strcat(p, "\n"); + setup_string_in_str(&input, p); + rcode = parse_stream_outer(&input, flag); + free(p); + return rcode; + } else { +#endif + setup_string_in_str(&input, s); + return parse_stream_outer(&input, flag); +#ifdef __U_BOOT__ + } +#endif +} + +#ifndef __U_BOOT__ +static int parse_file_outer(FILE *f) +#else +int parse_file_outer(void) +#endif +{ + int rcode; + struct in_str input; +#ifndef __U_BOOT__ + setup_file_in_str(&input, f); +#else + setup_file_in_str(&input); +#endif + rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); + return rcode; +} + +#ifdef __U_BOOT__ +#ifdef CONFIG_NEEDS_MANUAL_RELOC +static void u_boot_hush_reloc(void) +{ + unsigned long addr; + struct reserved_combo *r; + + for (r=reserved_list; rliteral) + gd->reloc_off; + r->literal = (char *)addr; + } +} +#endif + +int u_boot_hush_start(void) +{ + if (top_vars == NULL) { + top_vars = malloc(sizeof(struct variables)); + top_vars->name = "HUSH_VERSION"; + top_vars->value = "0.01"; + top_vars->next = NULL; + top_vars->flg_export = 0; + top_vars->flg_read_only = 1; +#ifdef CONFIG_NEEDS_MANUAL_RELOC + u_boot_hush_reloc(); +#endif + } + return 0; +} + +static void *xmalloc(size_t size) +{ + void *p = NULL; + + if (!(p = malloc(size))) { + printf("ERROR : memory not allocated\n"); + for(;;); + } + return p; +} + +static void *xrealloc(void *ptr, size_t size) +{ + void *p = NULL; + + if (!(p = realloc(ptr, size))) { + printf("ERROR : memory not allocated\n"); + for(;;); + } + return p; +} +#endif /* __U_BOOT__ */ + +#ifndef __U_BOOT__ +/* Make sure we have a controlling tty. If we get started under a job + * aware app (like bash for example), make sure we are now in charge so + * we don't fight over who gets the foreground */ +static void setup_job_control(void) +{ + static pid_t shell_pgrp; + /* Loop until we are in the foreground. */ + while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) + kill (- shell_pgrp, SIGTTIN); + + /* Ignore interactive and job-control signals. */ + signal(SIGINT, SIG_IGN); + signal(SIGQUIT, SIG_IGN); + signal(SIGTERM, SIG_IGN); + signal(SIGTSTP, SIG_IGN); + signal(SIGTTIN, SIG_IGN); + signal(SIGTTOU, SIG_IGN); + signal(SIGCHLD, SIG_IGN); + + /* Put ourselves in our own process group. */ + setsid(); + shell_pgrp = getpid (); + setpgid (shell_pgrp, shell_pgrp); + + /* Grab control of the terminal. */ + tcsetpgrp(shell_terminal, shell_pgrp); +} + +int hush_main(int argc, char * const *argv) +{ + int opt; + FILE *input; + char **e = environ; + + /* XXX what should these be while sourcing /etc/profile? */ + global_argc = argc; + global_argv = argv; + + /* (re?) initialize globals. Sometimes hush_main() ends up calling + * hush_main(), therefore we cannot rely on the BSS to zero out this + * stuff. Reset these to 0 every time. */ + ifs = NULL; + /* map[] is taken care of with call to update_ifs_map() */ + fake_mode = 0; + interactive = 0; + close_me_head = NULL; + last_bg_pid = 0; + job_list = NULL; + last_jobid = 0; + + /* Initialize some more globals to non-zero values */ + set_cwd(); +#ifdef CONFIG_FEATURE_COMMAND_EDITING + cmdedit_set_initial_prompt(); +#else + PS1 = NULL; +#endif + PS2 = "> "; + + /* initialize our shell local variables with the values + * currently living in the environment */ + if (e) { + for (; *e; e++) + set_local_var(*e, 2); /* without call putenv() */ + } + + last_return_code=EXIT_SUCCESS; + + + if (argv[0] && argv[0][0] == '-') { + debug_printf("\nsourcing /etc/profile\n"); + if ((input = fopen("/etc/profile", "r")) != NULL) { + mark_open(fileno(input)); + parse_file_outer(input); + mark_closed(fileno(input)); + fclose(input); + } + } + input=stdin; + + while ((opt = getopt(argc, argv, "c:xif")) > 0) { + switch (opt) { + case 'c': + { + global_argv = argv+optind; + global_argc = argc-optind; + opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); + goto final_return; + } + break; + case 'i': + interactive++; + break; + case 'f': + fake_mode++; + break; + default: +#ifndef BB_VER + fprintf(stderr, "Usage: sh [FILE]...\n" + " or: sh -c command [args]...\n\n"); + exit(EXIT_FAILURE); +#else + show_usage(); +#endif + } + } + /* A shell is interactive if the `-i' flag was given, or if all of + * the following conditions are met: + * no -c command + * no arguments remaining or the -s flag given + * standard input is a terminal + * standard output is a terminal + * Refer to Posix.2, the description of the `sh' utility. */ + if (argv[optind]==NULL && input==stdin && + isatty(fileno(stdin)) && isatty(fileno(stdout))) { + interactive++; + } + + debug_printf("\ninteractive=%d\n", interactive); + if (interactive) { + /* Looks like they want an interactive shell */ +#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET + printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); + printf( "Enter 'help' for a list of built-in commands.\n\n"); +#endif + setup_job_control(); + } + + if (argv[optind]==NULL) { + opt=parse_file_outer(stdin); + goto final_return; + } + + debug_printf("\nrunning script '%s'\n", argv[optind]); + global_argv = argv+optind; + global_argc = argc-optind; + input = xfopen(argv[optind], "r"); + opt = parse_file_outer(input); + +#ifdef CONFIG_FEATURE_CLEAN_UP + fclose(input); + if (cwd && cwd != unknown) + free((char*)cwd); + { + struct variables *cur, *tmp; + for(cur = top_vars; cur; cur = tmp) { + tmp = cur->next; + if (!cur->flg_read_only) { + free(cur->name); + free(cur->value); + free(cur); + } + } + } +#endif + +final_return: + return(opt?opt:last_return_code); +} +#endif + +static char *insert_var_value(char *inp) +{ + return insert_var_value_sub(inp, 0); +} + +static char *insert_var_value_sub(char *inp, int tag_subst) +{ + int res_str_len = 0; + int len; + int done = 0; + char *p, *p1, *res_str = NULL; + + while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { + /* check the beginning of the string for normal charachters */ + if (p != inp) { + /* copy any charachters to the result string */ + len = p - inp; + res_str = xrealloc(res_str, (res_str_len + len)); + strncpy((res_str + res_str_len), inp, len); + res_str_len += len; + } + inp = ++p; + /* find the ending marker */ + p = strchr(inp, SPECIAL_VAR_SYMBOL); + *p = '\0'; + /* look up the value to substitute */ + if ((p1 = lookup_param(inp))) { + if (tag_subst) + len = res_str_len + strlen(p1) + 2; + else + len = res_str_len + strlen(p1); + res_str = xrealloc(res_str, (1 + len)); + if (tag_subst) { + /* + * copy the variable value to the result + * string + */ + strcpy((res_str + res_str_len + 1), p1); + + /* + * mark the replaced text to be accepted as + * is + */ + res_str[res_str_len] = SUBSTED_VAR_SYMBOL; + res_str[res_str_len + 1 + strlen(p1)] = + SUBSTED_VAR_SYMBOL; + } else + /* + * copy the variable value to the result + * string + */ + strcpy((res_str + res_str_len), p1); + + res_str_len = len; + } + *p = SPECIAL_VAR_SYMBOL; + inp = ++p; + done = 1; + } + if (done) { + res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); + strcpy((res_str + res_str_len), inp); + while ((p = strchr(res_str, '\n'))) { + *p = ' '; + } + } + return (res_str == NULL) ? inp : res_str; +} + +static char **make_list_in(char **inp, char *name) +{ + int len, i; + int name_len = strlen(name); + int n = 0; + char **list; + char *p1, *p2, *p3; + + /* create list of variable values */ + list = xmalloc(sizeof(*list)); + for (i = 0; inp[i]; i++) { + p3 = insert_var_value(inp[i]); + p1 = p3; + while (*p1) { + if ((*p1 == ' ')) { + p1++; + continue; + } + if ((p2 = strchr(p1, ' '))) { + len = p2 - p1; + } else { + len = strlen(p1); + p2 = p1 + len; + } + /* we use n + 2 in realloc for list,because we add + * new element and then we will add NULL element */ + list = xrealloc(list, sizeof(*list) * (n + 2)); + list[n] = xmalloc(2 + name_len + len); + strcpy(list[n], name); + strcat(list[n], "="); + strncat(list[n], p1, len); + list[n++][name_len + len + 1] = '\0'; + p1 = p2; + } + if (p3 != inp[i]) free(p3); + } + list[n] = NULL; + return list; +} + +/* + * Make new string for parser + * inp - array of argument strings to flatten + * nonnull - indicates argument was quoted when originally parsed + */ +static char *make_string(char **inp, int *nonnull) +{ + char *p; + char *str = NULL; + int n; + int len = 2; + char *noeval_str; + int noeval = 0; + + noeval_str = get_local_var("HUSH_NO_EVAL"); + if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') + noeval = 1; + for (n = 0; inp[n]; n++) { + p = insert_var_value_sub(inp[n], noeval); + str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); + if (n) { + strcat(str, " "); + } else { + *str = '\0'; + } + if (nonnull[n]) + strcat(str, "'"); + strcat(str, p); + if (nonnull[n]) + strcat(str, "'"); + len = strlen(str) + 3; + if (p != inp[n]) free(p); + } + len = strlen(str); + *(str + len) = '\n'; + *(str + len + 1) = '\0'; + return str; +} + +#ifdef __U_BOOT__ +static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + int i, k; + int rcode = 0; + struct variables *cur; + + if (argc == 1) { /* Print all env variables */ + for (cur = top_vars; cur; cur = cur->next) { + printf ("%s=%s\n", cur->name, cur->value); + if (ctrlc ()) { + puts ("\n ** Abort\n"); + return 1; + } + } + return 0; + } + for (i = 1; i < argc; ++i) { /* print single env variables */ + char *name = argv[i]; + + k = -1; + for (cur = top_vars; cur; cur = cur->next) { + if(strcmp (cur->name, name) == 0) { + k = 0; + printf ("%s=%s\n", cur->name, cur->value); + } + if (ctrlc ()) { + puts ("\n ** Abort\n"); + return 1; + } + } + if (k < 0) { + printf ("## Error: \"%s\" not defined\n", name); + rcode ++; + } + } + return rcode; +} + +U_BOOT_CMD( + showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, + "print local hushshell variables", + "\n - print values of all hushshell variables\n" + "showvar name ...\n" + " - print value of hushshell variable 'name'" +); + +#endif +/****************************************************************************/ diff --git a/common/hush.c b/common/hush.c deleted file mode 100644 index 5b43224..0000000 --- a/common/hush.c +++ /dev/null @@ -1,3687 +0,0 @@ -/* - * sh.c -- a prototype Bourne shell grammar parser - * Intended to follow the original Thompson and Ritchie - * "small and simple is beautiful" philosophy, which - * incidentally is a good match to today's BusyBox. - * - * Copyright (C) 2000,2001 Larry Doolittle - * - * Credits: - * The parser routines proper are all original material, first - * written Dec 2000 and Jan 2001 by Larry Doolittle. - * The execution engine, the builtins, and much of the underlying - * support has been adapted from busybox-0.49pre's lash, - * which is Copyright (C) 2000 by Lineo, Inc., and - * written by Erik Andersen , . - * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and - * Erik W. Troan, which they placed in the public domain. I don't know - * how much of the Johnson/Troan code has survived the repeated rewrites. - * Other credits: - * b_addchr() derived from similar w_addchar function in glibc-2.2 - * setup_redirect(), redirect_opt_num(), and big chunks of main() - * and many builtins derived from contributions by Erik Andersen - * miscellaneous bugfixes from Matt Kraai - * - * There are two big (and related) architecture differences between - * this parser and the lash parser. One is that this version is - * actually designed from the ground up to understand nearly all - * of the Bourne grammar. The second, consequential change is that - * the parser and input reader have been turned inside out. Now, - * the parser is in control, and asks for input as needed. The old - * way had the input reader in control, and it asked for parsing to - * take place as needed. The new way makes it much easier to properly - * handle the recursion implicit in the various substitutions, especially - * across continuation lines. - * - * Bash grammar not implemented: (how many of these were in original sh?) - * $@ (those sure look like weird quoting rules) - * $_ - * ! negation operator for pipes - * &> and >& redirection of stdout+stderr - * Brace Expansion - * Tilde Expansion - * fancy forms of Parameter Expansion - * aliases - * Arithmetic Expansion - * <(list) and >(list) Process Substitution - * reserved words: case, esac, select, function - * Here Documents ( << word ) - * Functions - * Major bugs: - * job handling woefully incomplete and buggy - * reserved word execution woefully incomplete and buggy - * to-do: - * port selected bugfixes from post-0.49 busybox lash - done? - * finish implementing reserved words: for, while, until, do, done - * change { and } from special chars to reserved words - * builtins: break, continue, eval, return, set, trap, ulimit - * test magic exec - * handle children going into background - * clean up recognition of null pipes - * check setting of global_argc and global_argv - * control-C handling, probably with longjmp - * follow IFS rules more precisely, including update semantics - * figure out what to do with backslash-newline - * explain why we use signal instead of sigaction - * propagate syntax errors, die on resource errors? - * continuation lines, both explicit and implicit - done? - * memory leak finding and plugging - done? - * more testing, especially quoting rules and redirection - * document how quoting rules not precisely followed for variable assignments - * maybe change map[] to use 2-bit entries - * (eventually) remove all the printf's - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#define __U_BOOT__ -#ifdef __U_BOOT__ -#include /* malloc, free, realloc*/ -#include /* isalpha, isdigit */ -#include /* readline */ -#include -#include /* find_cmd */ -#ifndef CONFIG_SYS_PROMPT_HUSH_PS2 -#define CONFIG_SYS_PROMPT_HUSH_PS2 "> " -#endif -#endif -#ifndef __U_BOOT__ -#include /* isalpha, isdigit */ -#include /* getpid */ -#include /* getenv, atoi */ -#include /* strchr */ -#include /* popen etc. */ -#include /* glob, of course */ -#include /* va_list */ -#include -#include -#include /* should be pretty obvious */ - -#include /* ulimit */ -#include -#include -#include - -/* #include */ - -#if 1 -#include "busybox.h" -#include "cmdedit.h" -#else -#define applet_name "hush" -#include "standalone.h" -#define hush_main main -#undef CONFIG_FEATURE_SH_FANCY_PROMPT -#define BB_BANNER -#endif -#endif -#define SPECIAL_VAR_SYMBOL 03 -#define SUBSTED_VAR_SYMBOL 04 -#ifndef __U_BOOT__ -#define FLAG_EXIT_FROM_LOOP 1 -#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ -#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */ - -#endif - -#ifdef __U_BOOT__ -DECLARE_GLOBAL_DATA_PTR; - -#define EXIT_SUCCESS 0 -#define EOF -1 -#define syntax() syntax_err() -#define xstrdup strdup -#define error_msg printf -#else -typedef enum { - REDIRECT_INPUT = 1, - REDIRECT_OVERWRITE = 2, - REDIRECT_APPEND = 3, - REDIRECT_HEREIS = 4, - REDIRECT_IO = 5 -} redir_type; - -/* The descrip member of this structure is only used to make debugging - * output pretty */ -struct {int mode; int default_fd; char *descrip;} redir_table[] = { - { 0, 0, "()" }, - { O_RDONLY, 0, "<" }, - { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, - { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, - { O_RDONLY, -1, "<<" }, - { O_RDWR, 1, "<>" } -}; -#endif - -typedef enum { - PIPE_SEQ = 1, - PIPE_AND = 2, - PIPE_OR = 3, - PIPE_BG = 4, -} pipe_style; - -/* might eventually control execution */ -typedef enum { - RES_NONE = 0, - RES_IF = 1, - RES_THEN = 2, - RES_ELIF = 3, - RES_ELSE = 4, - RES_FI = 5, - RES_FOR = 6, - RES_WHILE = 7, - RES_UNTIL = 8, - RES_DO = 9, - RES_DONE = 10, - RES_XXXX = 11, - RES_IN = 12, - RES_SNTX = 13 -} reserved_style; -#define FLAG_END (1<, but protected with __USE_GNU */ -#endif - -/* "globals" within this file */ -static uchar *ifs; -static char map[256]; -#ifndef __U_BOOT__ -static int fake_mode; -static int interactive; -static struct close_me *close_me_head; -static const char *cwd; -static struct pipe *job_list; -static unsigned int last_bg_pid; -static unsigned int last_jobid; -static unsigned int shell_terminal; -static char *PS1; -static char *PS2; -struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 }; -struct variables *top_vars = &shell_ver; -#else -static int flag_repeat = 0; -static int do_repeat = 0; -static struct variables *top_vars = NULL ; -#endif /*__U_BOOT__ */ - -#define B_CHUNK (100) -#define B_NOSPAC 1 - -typedef struct { - char *data; - int length; - int maxlen; - int quote; - int nonnull; -} o_string; -#define NULL_O_STRING {NULL,0,0,0,0} -/* used for initialization: - o_string foo = NULL_O_STRING; */ - -/* I can almost use ordinary FILE *. Is open_memstream() universally - * available? Where is it documented? */ -struct in_str { - const char *p; -#ifndef __U_BOOT__ - char peek_buf[2]; -#endif - int __promptme; - int promptmode; -#ifndef __U_BOOT__ - FILE *file; -#endif - int (*get) (struct in_str *); - int (*peek) (struct in_str *); -}; -#define b_getch(input) ((input)->get(input)) -#define b_peek(input) ((input)->peek(input)) - -#ifndef __U_BOOT__ -#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" - -struct built_in_command { - char *cmd; /* name */ - char *descr; /* description */ - int (*function) (struct child_prog *); /* function ptr */ -}; -#endif - -/* define DEBUG_SHELL for debugging output (obviously ;-)) */ -#if 0 -#define DEBUG_SHELL -#endif - -/* This should be in utility.c */ -#ifdef DEBUG_SHELL -#ifndef __U_BOOT__ -static void debug_printf(const char *format, ...) -{ - va_list args; - va_start(args, format); - vfprintf(stderr, format, args); - va_end(args); -} -#else -#define debug_printf(fmt,args...) printf (fmt ,##args) -#endif -#else -static inline void debug_printf(const char *format, ...) { } -#endif -#define final_printf debug_printf - -#ifdef __U_BOOT__ -static void syntax_err(void) { - printf("syntax error\n"); -} -#else -static void __syntax(char *file, int line) { - error_msg("syntax error %s:%d", file, line); -} -#define syntax() __syntax(__FILE__, __LINE__) -#endif - -#ifdef __U_BOOT__ -static void *xmalloc(size_t size); -static void *xrealloc(void *ptr, size_t size); -#else -/* Index of subroutines: */ -/* function prototypes for builtins */ -static int builtin_cd(struct child_prog *child); -static int builtin_env(struct child_prog *child); -static int builtin_eval(struct child_prog *child); -static int builtin_exec(struct child_prog *child); -static int builtin_exit(struct child_prog *child); -static int builtin_export(struct child_prog *child); -static int builtin_fg_bg(struct child_prog *child); -static int builtin_help(struct child_prog *child); -static int builtin_jobs(struct child_prog *child); -static int builtin_pwd(struct child_prog *child); -static int builtin_read(struct child_prog *child); -static int builtin_set(struct child_prog *child); -static int builtin_shift(struct child_prog *child); -static int builtin_source(struct child_prog *child); -static int builtin_umask(struct child_prog *child); -static int builtin_unset(struct child_prog *child); -static int builtin_not_written(struct child_prog *child); -#endif -/* o_string manipulation: */ -static int b_check_space(o_string *o, int len); -static int b_addchr(o_string *o, int ch); -static void b_reset(o_string *o); -static int b_addqchr(o_string *o, int ch, int quote); -#ifndef __U_BOOT__ -static int b_adduint(o_string *o, unsigned int i); -#endif -/* in_str manipulations: */ -static int static_get(struct in_str *i); -static int static_peek(struct in_str *i); -static int file_get(struct in_str *i); -static int file_peek(struct in_str *i); -#ifndef __U_BOOT__ -static void setup_file_in_str(struct in_str *i, FILE *f); -#else -static void setup_file_in_str(struct in_str *i); -#endif -static void setup_string_in_str(struct in_str *i, const char *s); -#ifndef __U_BOOT__ -/* close_me manipulations: */ -static void mark_open(int fd); -static void mark_closed(int fd); -static void close_all(void); -#endif -/* "run" the final data structures: */ -static char *indenter(int i); -static int free_pipe_list(struct pipe *head, int indent); -static int free_pipe(struct pipe *pi, int indent); -/* really run the final data structures: */ -#ifndef __U_BOOT__ -static int setup_redirects(struct child_prog *prog, int squirrel[]); -#endif -static int run_list_real(struct pipe *pi); -#ifndef __U_BOOT__ -static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn)); -#endif -static int run_pipe_real(struct pipe *pi); -/* extended glob support: */ -#ifndef __U_BOOT__ -static int globhack(const char *src, int flags, glob_t *pglob); -static int glob_needed(const char *s); -static int xglob(o_string *dest, int flags, glob_t *pglob); -#endif -/* variable assignment: */ -static int is_assignment(const char *s); -/* data structure manipulation: */ -#ifndef __U_BOOT__ -static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input); -#endif -static void initialize_context(struct p_context *ctx); -static int done_word(o_string *dest, struct p_context *ctx); -static int done_command(struct p_context *ctx); -static int done_pipe(struct p_context *ctx, pipe_style type); -/* primary string parsing: */ -#ifndef __U_BOOT__ -static int redirect_dup_num(struct in_str *input); -static int redirect_opt_num(o_string *o); -static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end); -static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch); -#endif -static char *lookup_param(char *src); -static char *make_string(char **inp, int *nonnull); -static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input); -#ifndef __U_BOOT__ -static int parse_string(o_string *dest, struct p_context *ctx, const char *src); -#endif -static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger); -/* setup: */ -static int parse_stream_outer(struct in_str *inp, int flag); -#ifndef __U_BOOT__ -static int parse_string_outer(const char *s, int flag); -static int parse_file_outer(FILE *f); -#endif -#ifndef __U_BOOT__ -/* job management: */ -static int checkjobs(struct pipe* fg_pipe); -static void insert_bg_job(struct pipe *pi); -static void remove_bg_job(struct pipe *pi); -#endif -/* local variable support */ -static char **make_list_in(char **inp, char *name); -static char *insert_var_value(char *inp); -static char *insert_var_value_sub(char *inp, int tag_subst); - -#ifndef __U_BOOT__ -/* Table of built-in functions. They can be forked or not, depending on - * context: within pipes, they fork. As simple commands, they do not. - * When used in non-forking context, they can change global variables - * in the parent shell process. If forked, of course they can not. - * For example, 'unset foo | whatever' will parse and run, but foo will - * still be set at the end. */ -static struct built_in_command bltins[] = { - {"bg", "Resume a job in the background", builtin_fg_bg}, - {"break", "Exit for, while or until loop", builtin_not_written}, - {"cd", "Change working directory", builtin_cd}, - {"continue", "Continue for, while or until loop", builtin_not_written}, - {"env", "Print all environment variables", builtin_env}, - {"eval", "Construct and run shell command", builtin_eval}, - {"exec", "Exec command, replacing this shell with the exec'd process", - builtin_exec}, - {"exit", "Exit from shell()", builtin_exit}, - {"export", "Set environment variable", builtin_export}, - {"fg", "Bring job into the foreground", builtin_fg_bg}, - {"jobs", "Lists the active jobs", builtin_jobs}, - {"pwd", "Print current directory", builtin_pwd}, - {"read", "Input environment variable", builtin_read}, - {"return", "Return from a function", builtin_not_written}, - {"set", "Set/unset shell local variables", builtin_set}, - {"shift", "Shift positional parameters", builtin_shift}, - {"trap", "Trap signals", builtin_not_written}, - {"ulimit","Controls resource limits", builtin_not_written}, - {"umask","Sets file creation mask", builtin_umask}, - {"unset", "Unset environment variable", builtin_unset}, - {".", "Source-in and run commands in a file", builtin_source}, - {"help", "List shell built-in commands", builtin_help}, - {NULL, NULL, NULL} -}; - -static const char *set_cwd(void) -{ - if(cwd==unknown) - cwd = NULL; /* xgetcwd(arg) called free(arg) */ - cwd = xgetcwd((char *)cwd); - if (!cwd) - cwd = unknown; - return cwd; -} - -/* built-in 'eval' handler */ -static int builtin_eval(struct child_prog *child) -{ - char *str = NULL; - int rcode = EXIT_SUCCESS; - - if (child->argv[1]) { - str = make_string(child->argv + 1); - parse_string_outer(str, FLAG_EXIT_FROM_LOOP | - FLAG_PARSE_SEMICOLON); - free(str); - rcode = last_return_code; - } - return rcode; -} - -/* built-in 'cd ' handler */ -static int builtin_cd(struct child_prog *child) -{ - char *newdir; - if (child->argv[1] == NULL) - newdir = getenv("HOME"); - else - newdir = child->argv[1]; - if (chdir(newdir)) { - printf("cd: %s: %s\n", newdir, strerror(errno)); - return EXIT_FAILURE; - } - set_cwd(); - return EXIT_SUCCESS; -} - -/* built-in 'env' handler */ -static int builtin_env(struct child_prog *dummy) -{ - char **e = environ; - if (e == NULL) return EXIT_FAILURE; - for (; *e; e++) { - puts(*e); - } - return EXIT_SUCCESS; -} - -/* built-in 'exec' handler */ -static int builtin_exec(struct child_prog *child) -{ - if (child->argv[1] == NULL) - return EXIT_SUCCESS; /* Really? */ - child->argv++; - pseudo_exec(child); - /* never returns */ -} - -/* built-in 'exit' handler */ -static int builtin_exit(struct child_prog *child) -{ - if (child->argv[1] == NULL) - exit(last_return_code); - exit (atoi(child->argv[1])); -} - -/* built-in 'export VAR=value' handler */ -static int builtin_export(struct child_prog *child) -{ - int res = 0; - char *name = child->argv[1]; - - if (name == NULL) { - return (builtin_env(child)); - } - - name = strdup(name); - - if(name) { - char *value = strchr(name, '='); - - if (!value) { - char *tmp; - /* They are exporting something without an =VALUE */ - - value = get_local_var(name); - if (value) { - size_t ln = strlen(name); - - tmp = realloc(name, ln+strlen(value)+2); - if(tmp==NULL) - res = -1; - else { - sprintf(tmp+ln, "=%s", value); - name = tmp; - } - } else { - /* bash does not return an error when trying to export - * an undefined variable. Do likewise. */ - res = 1; - } - } - } - if (res<0) - perror_msg("export"); - else if(res==0) - res = set_local_var(name, 1); - else - res = 0; - free(name); - return res; -} - -/* built-in 'fg' and 'bg' handler */ -static int builtin_fg_bg(struct child_prog *child) -{ - int i, jobnum; - struct pipe *pi=NULL; - - if (!interactive) - return EXIT_FAILURE; - /* If they gave us no args, assume they want the last backgrounded task */ - if (!child->argv[1]) { - for (pi = job_list; pi; pi = pi->next) { - if (pi->jobid == last_jobid) { - break; - } - } - if (!pi) { - error_msg("%s: no current job", child->argv[0]); - return EXIT_FAILURE; - } - } else { - if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { - error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); - return EXIT_FAILURE; - } - for (pi = job_list; pi; pi = pi->next) { - if (pi->jobid == jobnum) { - break; - } - } - if (!pi) { - error_msg("%s: %d: no such job", child->argv[0], jobnum); - return EXIT_FAILURE; - } - } - - if (*child->argv[0] == 'f') { - /* Put the job into the foreground. */ - tcsetpgrp(shell_terminal, pi->pgrp); - } - - /* Restart the processes in the job */ - for (i = 0; i < pi->num_progs; i++) - pi->progs[i].is_stopped = 0; - - if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { - if (i == ESRCH) { - remove_bg_job(pi); - } else { - perror_msg("kill (SIGCONT)"); - } - } - - pi->stopped_progs = 0; - return EXIT_SUCCESS; -} - -/* built-in 'help' handler */ -static int builtin_help(struct child_prog *dummy) -{ - struct built_in_command *x; - - printf("\nBuilt-in commands:\n"); - printf("-------------------\n"); - for (x = bltins; x->cmd; x++) { - if (x->descr==NULL) - continue; - printf("%s\t%s\n", x->cmd, x->descr); - } - printf("\n\n"); - return EXIT_SUCCESS; -} - -/* built-in 'jobs' handler */ -static int builtin_jobs(struct child_prog *child) -{ - struct pipe *job; - char *status_string; - - for (job = job_list; job; job = job->next) { - if (job->running_progs == job->stopped_progs) - status_string = "Stopped"; - else - status_string = "Running"; - - printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); - } - return EXIT_SUCCESS; -} - - -/* built-in 'pwd' handler */ -static int builtin_pwd(struct child_prog *dummy) -{ - puts(set_cwd()); - return EXIT_SUCCESS; -} - -/* built-in 'read VAR' handler */ -static int builtin_read(struct child_prog *child) -{ - int res; - - if (child->argv[1]) { - char string[BUFSIZ]; - char *var = 0; - - string[0] = 0; /* In case stdin has only EOF */ - /* read string */ - fgets(string, sizeof(string), stdin); - chomp(string); - var = malloc(strlen(child->argv[1])+strlen(string)+2); - if(var) { - sprintf(var, "%s=%s", child->argv[1], string); - res = set_local_var(var, 0); - } else - res = -1; - if (res) - fprintf(stderr, "read: %m\n"); - free(var); /* So not move up to avoid breaking errno */ - return res; - } else { - do res=getchar(); while(res!='\n' && res!=EOF); - return 0; - } -} - -/* built-in 'set VAR=value' handler */ -static int builtin_set(struct child_prog *child) -{ - char *temp = child->argv[1]; - struct variables *e; - - if (temp == NULL) - for(e = top_vars; e; e=e->next) - printf("%s=%s\n", e->name, e->value); - else - set_local_var(temp, 0); - - return EXIT_SUCCESS; -} - - -/* Built-in 'shift' handler */ -static int builtin_shift(struct child_prog *child) -{ - int n=1; - if (child->argv[1]) { - n=atoi(child->argv[1]); - } - if (n>=0 && nargv[1] == NULL) - return EXIT_FAILURE; - - /* XXX search through $PATH is missing */ - input = fopen(child->argv[1], "r"); - if (!input) { - error_msg("Couldn't open file '%s'", child->argv[1]); - return EXIT_FAILURE; - } - - /* Now run the file */ - /* XXX argv and argc are broken; need to save old global_argv - * (pointer only is OK!) on this stack frame, - * set global_argv=child->argv+1, recurse, and restore. */ - mark_open(fileno(input)); - status = parse_file_outer(input); - mark_closed(fileno(input)); - fclose(input); - return (status); -} - -static int builtin_umask(struct child_prog *child) -{ - mode_t new_umask; - const char *arg = child->argv[1]; - char *end; - if (arg) { - new_umask=strtoul(arg, &end, 8); - if (*end!='\0' || end == arg) { - return EXIT_FAILURE; - } - } else { - printf("%.3o\n", (unsigned int) (new_umask=umask(0))); - } - umask(new_umask); - return EXIT_SUCCESS; -} - -/* built-in 'unset VAR' handler */ -static int builtin_unset(struct child_prog *child) -{ - /* bash returned already true */ - unset_local_var(child->argv[1]); - return EXIT_SUCCESS; -} - -static int builtin_not_written(struct child_prog *child) -{ - printf("builtin_%s not written\n",child->argv[0]); - return EXIT_FAILURE; -} -#endif - -static int b_check_space(o_string *o, int len) -{ - /* It would be easy to drop a more restrictive policy - * in here, such as setting a maximum string length */ - if (o->length + len > o->maxlen) { - char *old_data = o->data; - /* assert (data == NULL || o->maxlen != 0); */ - o->maxlen += max(2*len, B_CHUNK); - o->data = realloc(o->data, 1 + o->maxlen); - if (o->data == NULL) { - free(old_data); - } - } - return o->data == NULL; -} - -static int b_addchr(o_string *o, int ch) -{ - debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); - if (b_check_space(o, 1)) return B_NOSPAC; - o->data[o->length] = ch; - o->length++; - o->data[o->length] = '\0'; - return 0; -} - -static void b_reset(o_string *o) -{ - o->length = 0; - o->nonnull = 0; - if (o->data != NULL) *o->data = '\0'; -} - -static void b_free(o_string *o) -{ - b_reset(o); - free(o->data); - o->data = NULL; - o->maxlen = 0; -} - -/* My analysis of quoting semantics tells me that state information - * is associated with a destination, not a source. - */ -static int b_addqchr(o_string *o, int ch, int quote) -{ - if (quote && strchr("*?[\\",ch)) { - int rc; - rc = b_addchr(o, '\\'); - if (rc) return rc; - } - return b_addchr(o, ch); -} - -#ifndef __U_BOOT__ -static int b_adduint(o_string *o, unsigned int i) -{ - int r; - char *p = simple_itoa(i); - /* no escape checking necessary */ - do r=b_addchr(o, *p++); while (r==0 && *p); - return r; -} -#endif - -static int static_get(struct in_str *i) -{ - int ch = *i->p++; - if (ch=='\0') return EOF; - return ch; -} - -static int static_peek(struct in_str *i) -{ - return *i->p; -} - -#ifndef __U_BOOT__ -static inline void cmdedit_set_initial_prompt(void) -{ -#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT - PS1 = NULL; -#else - PS1 = getenv("PS1"); - if(PS1==0) - PS1 = "\\w \\$ "; -#endif -} - -static inline void setup_prompt_string(int promptmode, char **prompt_str) -{ - debug_printf("setup_prompt_string %d ",promptmode); -#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT - /* Set up the prompt */ - if (promptmode == 1) { - free(PS1); - PS1=xmalloc(strlen(cwd)+4); - sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); - *prompt_str = PS1; - } else { - *prompt_str = PS2; - } -#else - *prompt_str = (promptmode==1)? PS1 : PS2; -#endif - debug_printf("result %s\n",*prompt_str); -} -#endif - -static void get_user_input(struct in_str *i) -{ -#ifndef __U_BOOT__ - char *prompt_str; - static char the_command[BUFSIZ]; - - setup_prompt_string(i->promptmode, &prompt_str); -#ifdef CONFIG_FEATURE_COMMAND_EDITING - /* - ** enable command line editing only while a command line - ** is actually being read; otherwise, we'll end up bequeathing - ** atexit() handlers and other unwanted stuff to our - ** child processes (rob@sysgo.de) - */ - cmdedit_read_input(prompt_str, the_command); -#else - fputs(prompt_str, stdout); - fflush(stdout); - the_command[0]=fgetc(i->file); - the_command[1]='\0'; -#endif - fflush(stdout); - i->p = the_command; -#else - int n; - static char the_command[CONFIG_SYS_CBSIZE + 1]; - -#ifdef CONFIG_BOOT_RETRY_TIME -# ifndef CONFIG_RESET_TO_RETRY -# error "This currently only works with CONFIG_RESET_TO_RETRY enabled" -# endif - reset_cmd_timeout(); -#endif - i->__promptme = 1; - if (i->promptmode == 1) { - n = readline(CONFIG_SYS_PROMPT); - } else { - n = readline(CONFIG_SYS_PROMPT_HUSH_PS2); - } -#ifdef CONFIG_BOOT_RETRY_TIME - if (n == -2) { - puts("\nTimeout waiting for command\n"); -# ifdef CONFIG_RESET_TO_RETRY - do_reset(NULL, 0, 0, NULL); -# else -# error "This currently only works with CONFIG_RESET_TO_RETRY enabled" -# endif - } -#endif - if (n == -1 ) { - flag_repeat = 0; - i->__promptme = 0; - } - n = strlen(console_buffer); - console_buffer[n] = '\n'; - console_buffer[n+1]= '\0'; - if (had_ctrlc()) flag_repeat = 0; - clear_ctrlc(); - do_repeat = 0; - if (i->promptmode == 1) { - if (console_buffer[0] == '\n'&& flag_repeat == 0) { - strcpy(the_command,console_buffer); - } - else { - if (console_buffer[0] != '\n') { - strcpy(the_command,console_buffer); - flag_repeat = 1; - } - else { - do_repeat = 1; - } - } - i->p = the_command; - } - else { - if (console_buffer[0] != '\n') { - if (strlen(the_command) + strlen(console_buffer) - < CONFIG_SYS_CBSIZE) { - n = strlen(the_command); - the_command[n-1] = ' '; - strcpy(&the_command[n],console_buffer); - } - else { - the_command[0] = '\n'; - the_command[1] = '\0'; - flag_repeat = 0; - } - } - if (i->__promptme == 0) { - the_command[0] = '\n'; - the_command[1] = '\0'; - } - i->p = console_buffer; - } -#endif -} - -/* This is the magic location that prints prompts - * and gets data back from the user */ -static int file_get(struct in_str *i) -{ - int ch; - - ch = 0; - /* If there is data waiting, eat it up */ - if (i->p && *i->p) { - ch = *i->p++; - } else { - /* need to double check i->file because we might be doing something - * more complicated by now, like sourcing or substituting. */ -#ifndef __U_BOOT__ - if (i->__promptme && interactive && i->file == stdin) { - while(! i->p || (interactive && strlen(i->p)==0) ) { -#else - while(! i->p || strlen(i->p)==0 ) { -#endif - get_user_input(i); - } - i->promptmode=2; -#ifndef __U_BOOT__ - i->__promptme = 0; -#endif - if (i->p && *i->p) { - ch = *i->p++; - } -#ifndef __U_BOOT__ - } else { - ch = fgetc(i->file); - } - -#endif - debug_printf("b_getch: got a %d\n", ch); - } -#ifndef __U_BOOT__ - if (ch == '\n') i->__promptme=1; -#endif - return ch; -} - -/* All the callers guarantee this routine will never be - * used right after a newline, so prompting is not needed. - */ -static int file_peek(struct in_str *i) -{ -#ifndef __U_BOOT__ - if (i->p && *i->p) { -#endif - return *i->p; -#ifndef __U_BOOT__ - } else { - i->peek_buf[0] = fgetc(i->file); - i->peek_buf[1] = '\0'; - i->p = i->peek_buf; - debug_printf("b_peek: got a %d\n", *i->p); - return *i->p; - } -#endif -} - -#ifndef __U_BOOT__ -static void setup_file_in_str(struct in_str *i, FILE *f) -#else -static void setup_file_in_str(struct in_str *i) -#endif -{ - i->peek = file_peek; - i->get = file_get; - i->__promptme=1; - i->promptmode=1; -#ifndef __U_BOOT__ - i->file = f; -#endif - i->p = NULL; -} - -static void setup_string_in_str(struct in_str *i, const char *s) -{ - i->peek = static_peek; - i->get = static_get; - i->__promptme=1; - i->promptmode=1; - i->p = s; -} - -#ifndef __U_BOOT__ -static void mark_open(int fd) -{ - struct close_me *new = xmalloc(sizeof(struct close_me)); - new->fd = fd; - new->next = close_me_head; - close_me_head = new; -} - -static void mark_closed(int fd) -{ - struct close_me *tmp; - if (close_me_head == NULL || close_me_head->fd != fd) - error_msg_and_die("corrupt close_me"); - tmp = close_me_head; - close_me_head = close_me_head->next; - free(tmp); -} - -static void close_all(void) -{ - struct close_me *c; - for (c=close_me_head; c; c=c->next) { - close(c->fd); - } - close_me_head = NULL; -} - -/* squirrel != NULL means we squirrel away copies of stdin, stdout, - * and stderr if they are redirected. */ -static int setup_redirects(struct child_prog *prog, int squirrel[]) -{ - int openfd, mode; - struct redir_struct *redir; - - for (redir=prog->redirects; redir; redir=redir->next) { - if (redir->dup == -1 && redir->word.gl_pathv == NULL) { - /* something went wrong in the parse. Pretend it didn't happen */ - continue; - } - if (redir->dup == -1) { - mode=redir_table[redir->type].mode; - openfd = open(redir->word.gl_pathv[0], mode, 0666); - if (openfd < 0) { - /* this could get lost if stderr has been redirected, but - bash and ash both lose it as well (though zsh doesn't!) */ - perror_msg("error opening %s", redir->word.gl_pathv[0]); - return 1; - } - } else { - openfd = redir->dup; - } - - if (openfd != redir->fd) { - if (squirrel && redir->fd < 3) { - squirrel[redir->fd] = dup(redir->fd); - } - if (openfd == -3) { - close(openfd); - } else { - dup2(openfd, redir->fd); - if (redir->dup == -1) - close (openfd); - } - } - } - return 0; -} - -static void restore_redirects(int squirrel[]) -{ - int i, fd; - for (i=0; i<3; i++) { - fd = squirrel[i]; - if (fd != -1) { - /* No error checking. I sure wouldn't know what - * to do with an error if I found one! */ - dup2(fd, i); - close(fd); - } - } -} - -/* never returns */ -/* XXX no exit() here. If you don't exec, use _exit instead. - * The at_exit handlers apparently confuse the calling process, - * in particular stdin handling. Not sure why? */ -static void pseudo_exec(struct child_prog *child) -{ - int i, rcode; - char *p; - struct built_in_command *x; - if (child->argv) { - for (i=0; is_assignment(child->argv[i]); i++) { - debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); - p = insert_var_value(child->argv[i]); - putenv(strdup(p)); - if (p != child->argv[i]) free(p); - } - child->argv+=i; /* XXX this hack isn't so horrible, since we are about - to exit, and therefore don't need to keep data - structures consistent for free() use. */ - /* If a variable is assigned in a forest, and nobody listens, - * was it ever really set? - */ - if (child->argv[0] == NULL) { - _exit(EXIT_SUCCESS); - } - - /* - * Check if the command matches any of the builtins. - * Depending on context, this might be redundant. But it's - * easier to waste a few CPU cycles than it is to figure out - * if this is one of those cases. - */ - for (x = bltins; x->cmd; x++) { - if (strcmp(child->argv[0], x->cmd) == 0 ) { - debug_printf("builtin exec %s\n", child->argv[0]); - rcode = x->function(child); - fflush(stdout); - _exit(rcode); - } - } - - /* Check if the command matches any busybox internal commands - * ("applets") here. - * FIXME: This feature is not 100% safe, since - * BusyBox is not fully reentrant, so we have no guarantee the things - * from the .bss are still zeroed, or that things from .data are still - * at their defaults. We could exec ourself from /proc/self/exe, but I - * really dislike relying on /proc for things. We could exec ourself - * from global_argv[0], but if we are in a chroot, we may not be able - * to find ourself... */ -#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL - { - int argc_l; - char** argv_l=child->argv; - char *name = child->argv[0]; - -#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN - /* Following discussions from November 2000 on the busybox mailing - * list, the default configuration, (without - * get_last_path_component()) lets the user force use of an - * external command by specifying the full (with slashes) filename. - * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets - * _aways_ override external commands, so if you want to run - * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the - * filesystem and is _not_ busybox. Some systems may want this, - * most do not. */ - name = get_last_path_component(name); -#endif - /* Count argc for use in a second... */ - for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); - optind = 1; - debug_printf("running applet %s\n", name); - run_applet_by_name(name, argc_l, child->argv); - } -#endif - debug_printf("exec of %s\n",child->argv[0]); - execvp(child->argv[0],child->argv); - perror_msg("couldn't exec: %s",child->argv[0]); - _exit(1); - } else if (child->group) { - debug_printf("runtime nesting to group\n"); - interactive=0; /* crucial!!!! */ - rcode = run_list_real(child->group); - /* OK to leak memory by not calling free_pipe_list, - * since this process is about to exit */ - _exit(rcode); - } else { - /* Can happen. See what bash does with ">foo" by itself. */ - debug_printf("trying to pseudo_exec null command\n"); - _exit(EXIT_SUCCESS); - } -} - -static void insert_bg_job(struct pipe *pi) -{ - struct pipe *thejob; - - /* Linear search for the ID of the job to use */ - pi->jobid = 1; - for (thejob = job_list; thejob; thejob = thejob->next) - if (thejob->jobid >= pi->jobid) - pi->jobid = thejob->jobid + 1; - - /* add thejob to the list of running jobs */ - if (!job_list) { - thejob = job_list = xmalloc(sizeof(*thejob)); - } else { - for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; - thejob->next = xmalloc(sizeof(*thejob)); - thejob = thejob->next; - } - - /* physically copy the struct job */ - memcpy(thejob, pi, sizeof(struct pipe)); - thejob->next = NULL; - thejob->running_progs = thejob->num_progs; - thejob->stopped_progs = 0; - thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ - - /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ - { - char *bar=thejob->text; - char **foo=pi->progs[0].argv; - while(foo && *foo) { - bar += sprintf(bar, "%s ", *foo++); - } - } - - /* we don't wait for background thejobs to return -- append it - to the list of backgrounded thejobs and leave it alone */ - printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); - last_bg_pid = thejob->progs[0].pid; - last_jobid = thejob->jobid; -} - -/* remove a backgrounded job */ -static void remove_bg_job(struct pipe *pi) -{ - struct pipe *prev_pipe; - - if (pi == job_list) { - job_list = pi->next; - } else { - prev_pipe = job_list; - while (prev_pipe->next != pi) - prev_pipe = prev_pipe->next; - prev_pipe->next = pi->next; - } - if (job_list) - last_jobid = job_list->jobid; - else - last_jobid = 0; - - pi->stopped_progs = 0; - free_pipe(pi, 0); - free(pi); -} - -/* Checks to see if any processes have exited -- if they - have, figure out why and see if a job has completed */ -static int checkjobs(struct pipe* fg_pipe) -{ - int attributes; - int status; - int prognum = 0; - struct pipe *pi; - pid_t childpid; - - attributes = WUNTRACED; - if (fg_pipe==NULL) { - attributes |= WNOHANG; - } - - while ((childpid = waitpid(-1, &status, attributes)) > 0) { - if (fg_pipe) { - int i, rcode = 0; - for (i=0; i < fg_pipe->num_progs; i++) { - if (fg_pipe->progs[i].pid == childpid) { - if (i==fg_pipe->num_progs-1) - rcode=WEXITSTATUS(status); - (fg_pipe->num_progs)--; - return(rcode); - } - } - } - - for (pi = job_list; pi; pi = pi->next) { - prognum = 0; - while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { - prognum++; - } - if (prognum < pi->num_progs) - break; - } - - if(pi==NULL) { - debug_printf("checkjobs: pid %d was not in our list!\n", childpid); - continue; - } - - if (WIFEXITED(status) || WIFSIGNALED(status)) { - /* child exited */ - pi->running_progs--; - pi->progs[prognum].pid = 0; - - if (!pi->running_progs) { - printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); - remove_bg_job(pi); - } - } else { - /* child stopped */ - pi->stopped_progs++; - pi->progs[prognum].is_stopped = 1; - -#if 0 - /* Printing this stuff is a pain, since it tends to - * overwrite the prompt an inconveinient moments. So - * don't do that. */ - if (pi->stopped_progs == pi->num_progs) { - printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); - } -#endif - } - } - - if (childpid == -1 && errno != ECHILD) - perror_msg("waitpid"); - - /* move the shell to the foreground */ - /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ - /* perror_msg("tcsetpgrp-2"); */ - return -1; -} - -/* Figure out our controlling tty, checking in order stderr, - * stdin, and stdout. If check_pgrp is set, also check that - * we belong to the foreground process group associated with - * that tty. The value of shell_terminal is needed in order to call - * tcsetpgrp(shell_terminal, ...); */ -void controlling_tty(int check_pgrp) -{ - pid_t curpgrp; - - if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 - && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 - && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) - goto shell_terminal_error; - - if (check_pgrp && curpgrp != getpgid(0)) - goto shell_terminal_error; - - return; - -shell_terminal_error: - shell_terminal = -1; - return; -} -#endif - -/* run_pipe_real() starts all the jobs, but doesn't wait for anything - * to finish. See checkjobs(). - * - * return code is normally -1, when the caller has to wait for children - * to finish to determine the exit status of the pipe. If the pipe - * is a simple builtin command, however, the action is done by the - * time run_pipe_real returns, and the exit code is provided as the - * return value. - * - * The input of the pipe is always stdin, the output is always - * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, - * because it tries to avoid running the command substitution in - * subshell, when that is in fact necessary. The subshell process - * now has its stdout directed to the input of the appropriate pipe, - * so this routine is noticeably simpler. - */ -static int run_pipe_real(struct pipe *pi) -{ - int i; -#ifndef __U_BOOT__ - int nextin, nextout; - int pipefds[2]; /* pipefds[0] is for reading */ - struct child_prog *child; - struct built_in_command *x; - char *p; -# if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &i; - (void) &nextin; - (void) &nextout; - (void) &child; -# endif -#else - int nextin; - int flag = do_repeat ? CMD_FLAG_REPEAT : 0; - struct child_prog *child; - char *p; -# if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &i; - (void) &nextin; - (void) &child; -# endif -#endif /* __U_BOOT__ */ - - nextin = 0; -#ifndef __U_BOOT__ - pi->pgrp = -1; -#endif - - /* Check if this is a simple builtin (not part of a pipe). - * Builtins within pipes have to fork anyway, and are handled in - * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. - */ - if (pi->num_progs == 1) child = & (pi->progs[0]); -#ifndef __U_BOOT__ - if (pi->num_progs == 1 && child->group && child->subshell == 0) { - int squirrel[] = {-1, -1, -1}; - int rcode; - debug_printf("non-subshell grouping\n"); - setup_redirects(child, squirrel); - /* XXX could we merge code with following builtin case, - * by creating a pseudo builtin that calls run_list_real? */ - rcode = run_list_real(child->group); - restore_redirects(squirrel); -#else - if (pi->num_progs == 1 && child->group) { - int rcode; - debug_printf("non-subshell grouping\n"); - rcode = run_list_real(child->group); -#endif - return rcode; - } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { - for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } - if (i!=0 && child->argv[i]==NULL) { - /* assignments, but no command: set the local environment */ - for (i=0; child->argv[i]!=NULL; i++) { - - /* Ok, this case is tricky. We have to decide if this is a - * local variable, or an already exported variable. If it is - * already exported, we have to export the new value. If it is - * not exported, we need only set this as a local variable. - * This junk is all to decide whether or not to export this - * variable. */ - int export_me=0; - char *name, *value; - name = xstrdup(child->argv[i]); - debug_printf("Local environment set: %s\n", name); - value = strchr(name, '='); - if (value) - *value=0; -#ifndef __U_BOOT__ - if ( get_local_var(name)) { - export_me=1; - } -#endif - free(name); - p = insert_var_value(child->argv[i]); - set_local_var(p, export_me); - if (p != child->argv[i]) free(p); - } - return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ - } - for (i = 0; is_assignment(child->argv[i]); i++) { - p = insert_var_value(child->argv[i]); -#ifndef __U_BOOT__ - putenv(strdup(p)); -#else - set_local_var(p, 0); -#endif - if (p != child->argv[i]) { - child->sp--; - free(p); - } - } - if (child->sp) { - char * str = NULL; - - str = make_string(child->argv + i, - child->argv_nonnull + i); - parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); - free(str); - return last_return_code; - } -#ifndef __U_BOOT__ - for (x = bltins; x->cmd; x++) { - if (strcmp(child->argv[i], x->cmd) == 0 ) { - int squirrel[] = {-1, -1, -1}; - int rcode; - if (x->function == builtin_exec && child->argv[i+1]==NULL) { - debug_printf("magic exec\n"); - setup_redirects(child,NULL); - return EXIT_SUCCESS; - } - debug_printf("builtin inline %s\n", child->argv[0]); - /* XXX setup_redirects acts on file descriptors, not FILEs. - * This is perfect for work that comes after exec(). - * Is it really safe for inline use? Experimentally, - * things seem to work with glibc. */ - setup_redirects(child, squirrel); - - child->argv += i; /* XXX horrible hack */ - rcode = x->function(child); - /* XXX restore hack so free() can work right */ - child->argv -= i; - restore_redirects(squirrel); - } - return rcode; - } -#else - /* check ";", because ,example , argv consist from - * "help;flinfo" must not execute - */ - if (strchr(child->argv[i], ';')) { - printf("Unknown command '%s' - try 'help' or use " - "'run' command\n", child->argv[i]); - return -1; - } - /* Process the command */ - return cmd_process(flag, child->argc, child->argv, - &flag_repeat, NULL); -#endif - } -#ifndef __U_BOOT__ - - for (i = 0; i < pi->num_progs; i++) { - child = & (pi->progs[i]); - - /* pipes are inserted between pairs of commands */ - if ((i + 1) < pi->num_progs) { - if (pipe(pipefds)<0) perror_msg_and_die("pipe"); - nextout = pipefds[1]; - } else { - nextout=1; - pipefds[0] = -1; - } - - /* XXX test for failed fork()? */ - if (!(child->pid = fork())) { - /* Set the handling for job control signals back to the default. */ - signal(SIGINT, SIG_DFL); - signal(SIGQUIT, SIG_DFL); - signal(SIGTERM, SIG_DFL); - signal(SIGTSTP, SIG_DFL); - signal(SIGTTIN, SIG_DFL); - signal(SIGTTOU, SIG_DFL); - signal(SIGCHLD, SIG_DFL); - - close_all(); - - if (nextin != 0) { - dup2(nextin, 0); - close(nextin); - } - if (nextout != 1) { - dup2(nextout, 1); - close(nextout); - } - if (pipefds[0]!=-1) { - close(pipefds[0]); /* opposite end of our output pipe */ - } - - /* Like bash, explicit redirects override pipes, - * and the pipe fd is available for dup'ing. */ - setup_redirects(child,NULL); - - if (interactive && pi->followup!=PIPE_BG) { - /* If we (the child) win the race, put ourselves in the process - * group whose leader is the first process in this pipe. */ - if (pi->pgrp < 0) { - pi->pgrp = getpid(); - } - if (setpgid(0, pi->pgrp) == 0) { - tcsetpgrp(2, pi->pgrp); - } - } - - pseudo_exec(child); - } - - - /* put our child in the process group whose leader is the - first process in this pipe */ - if (pi->pgrp < 0) { - pi->pgrp = child->pid; - } - /* Don't check for errors. The child may be dead already, - * in which case setpgid returns error code EACCES. */ - setpgid(child->pid, pi->pgrp); - - if (nextin != 0) - close(nextin); - if (nextout != 1) - close(nextout); - - /* If there isn't another process, nextin is garbage - but it doesn't matter */ - nextin = pipefds[0]; - } -#endif - return -1; -} - -static int run_list_real(struct pipe *pi) -{ - char *save_name = NULL; - char **list = NULL; - char **save_list = NULL; - struct pipe *rpipe; - int flag_rep = 0; -#ifndef __U_BOOT__ - int save_num_progs; -#endif - int rcode=0, flag_skip=1; - int flag_restore = 0; - int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ - reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; - /* check syntax for "for" */ - for (rpipe = pi; rpipe; rpipe = rpipe->next) { - if ((rpipe->r_mode == RES_IN || - rpipe->r_mode == RES_FOR) && - (rpipe->next == NULL)) { - syntax(); -#ifdef __U_BOOT__ - flag_repeat = 0; -#endif - return 1; - } - if ((rpipe->r_mode == RES_IN && - (rpipe->next->r_mode == RES_IN && - rpipe->next->progs->argv != NULL))|| - (rpipe->r_mode == RES_FOR && - rpipe->next->r_mode != RES_IN)) { - syntax(); -#ifdef __U_BOOT__ - flag_repeat = 0; -#endif - return 1; - } - } - for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { - if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || - pi->r_mode == RES_FOR) { -#ifdef __U_BOOT__ - /* check Ctrl-C */ - ctrlc(); - if ((had_ctrlc())) { - return 1; - } -#endif - flag_restore = 0; - if (!rpipe) { - flag_rep = 0; - rpipe = pi; - } - } - rmode = pi->r_mode; - debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode); - if (rmode == skip_more_in_this_rmode && flag_skip) { - if (pi->followup == PIPE_SEQ) flag_skip=0; - continue; - } - flag_skip = 1; - skip_more_in_this_rmode = RES_XXXX; - if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; - if (rmode == RES_THEN && if_code) continue; - if (rmode == RES_ELSE && !if_code) continue; - if (rmode == RES_ELIF && !if_code) break; - if (rmode == RES_FOR && pi->num_progs) { - if (!list) { - /* if no variable values after "in" we skip "for" */ - if (!pi->next->progs->argv) continue; - /* create list of variable values */ - list = make_list_in(pi->next->progs->argv, - pi->progs->argv[0]); - save_list = list; - save_name = pi->progs->argv[0]; - pi->progs->argv[0] = NULL; - flag_rep = 1; - } - if (!(*list)) { - free(pi->progs->argv[0]); - free(save_list); - list = NULL; - flag_rep = 0; - pi->progs->argv[0] = save_name; -#ifndef __U_BOOT__ - pi->progs->glob_result.gl_pathv[0] = - pi->progs->argv[0]; -#endif - continue; - } else { - /* insert new value from list for variable */ - if (pi->progs->argv[0]) - free(pi->progs->argv[0]); - pi->progs->argv[0] = *list++; -#ifndef __U_BOOT__ - pi->progs->glob_result.gl_pathv[0] = - pi->progs->argv[0]; -#endif - } - } - if (rmode == RES_IN) continue; - if (rmode == RES_DO) { - if (!flag_rep) continue; - } - if ((rmode == RES_DONE)) { - if (flag_rep) { - flag_restore = 1; - } else { - rpipe = NULL; - } - } - if (pi->num_progs == 0) continue; -#ifndef __U_BOOT__ - save_num_progs = pi->num_progs; /* save number of programs */ -#endif - rcode = run_pipe_real(pi); - debug_printf("run_pipe_real returned %d\n",rcode); -#ifndef __U_BOOT__ - if (rcode!=-1) { - /* We only ran a builtin: rcode was set by the return value - * of run_pipe_real(), and we don't need to wait for anything. */ - } else if (pi->followup==PIPE_BG) { - /* XXX check bash's behavior with nontrivial pipes */ - /* XXX compute jobid */ - /* XXX what does bash do with attempts to background builtins? */ - insert_bg_job(pi); - rcode = EXIT_SUCCESS; - } else { - if (interactive) { - /* move the new process group into the foreground */ - if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) - perror_msg("tcsetpgrp-3"); - rcode = checkjobs(pi); - /* move the shell to the foreground */ - if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) - perror_msg("tcsetpgrp-4"); - } else { - rcode = checkjobs(pi); - } - debug_printf("checkjobs returned %d\n",rcode); - } - last_return_code=rcode; -#else - if (rcode < -1) { - last_return_code = -rcode - 2; - return -2; /* exit */ - } - last_return_code=(rcode == 0) ? 0 : 1; -#endif -#ifndef __U_BOOT__ - pi->num_progs = save_num_progs; /* restore number of programs */ -#endif - if ( rmode == RES_IF || rmode == RES_ELIF ) - next_if_code=rcode; /* can be overwritten a number of times */ - if (rmode == RES_WHILE) - flag_rep = !last_return_code; - if (rmode == RES_UNTIL) - flag_rep = last_return_code; - if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || - (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) - skip_more_in_this_rmode=rmode; -#ifndef __U_BOOT__ - checkjobs(NULL); -#endif - } - return rcode; -} - -/* broken, of course, but OK for testing */ -static char *indenter(int i) -{ - static char blanks[]=" "; - return &blanks[sizeof(blanks)-i-1]; -} - -/* return code is the exit status of the pipe */ -static int free_pipe(struct pipe *pi, int indent) -{ - char **p; - struct child_prog *child; -#ifndef __U_BOOT__ - struct redir_struct *r, *rnext; -#endif - int a, i, ret_code=0; - char *ind = indenter(indent); - -#ifndef __U_BOOT__ - if (pi->stopped_progs > 0) - return ret_code; - final_printf("%s run pipe: (pid %d)\n",ind,getpid()); -#endif - for (i=0; inum_progs; i++) { - child = &pi->progs[i]; - final_printf("%s command %d:\n",ind,i); - if (child->argv) { - for (a=0,p=child->argv; *p; a++,p++) { - final_printf("%s argv[%d] = %s\n",ind,a,*p); - } -#ifndef __U_BOOT__ - globfree(&child->glob_result); -#else - for (a = 0; a < child->argc; a++) { - free(child->argv[a]); - } - free(child->argv); - free(child->argv_nonnull); - child->argc = 0; -#endif - child->argv=NULL; - } else if (child->group) { -#ifndef __U_BOOT__ - final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); -#endif - ret_code = free_pipe_list(child->group,indent+3); - final_printf("%s end group\n",ind); - } else { - final_printf("%s (nil)\n",ind); - } -#ifndef __U_BOOT__ - for (r=child->redirects; r; r=rnext) { - final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); - if (r->dup == -1) { - /* guard against the case >$FOO, where foo is unset or blank */ - if (r->word.gl_pathv) { - final_printf(" %s\n", *r->word.gl_pathv); - globfree(&r->word); - } - } else { - final_printf("&%d\n", r->dup); - } - rnext=r->next; - free(r); - } - child->redirects=NULL; -#endif - } - free(pi->progs); /* children are an array, they get freed all at once */ - pi->progs=NULL; - return ret_code; -} - -static int free_pipe_list(struct pipe *head, int indent) -{ - int rcode=0; /* if list has no members */ - struct pipe *pi, *next; - char *ind = indenter(indent); - for (pi=head; pi; pi=next) { - final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); - rcode = free_pipe(pi, indent); - final_printf("%s pipe followup code %d\n", ind, pi->followup); - next=pi->next; - pi->next=NULL; - free(pi); - } - return rcode; -} - -/* Select which version we will use */ -static int run_list(struct pipe *pi) -{ - int rcode=0; -#ifndef __U_BOOT__ - if (fake_mode==0) { -#endif - rcode = run_list_real(pi); -#ifndef __U_BOOT__ - } -#endif - /* free_pipe_list has the side effect of clearing memory - * In the long run that function can be merged with run_list_real, - * but doing that now would hobble the debugging effort. */ - free_pipe_list(pi,0); - return rcode; -} - -/* The API for glob is arguably broken. This routine pushes a non-matching - * string into the output structure, removing non-backslashed backslashes. - * If someone can prove me wrong, by performing this function within the - * original glob(3) api, feel free to rewrite this routine into oblivion. - * Return code (0 vs. GLOB_NOSPACE) matches glob(3). - * XXX broken if the last character is '\\', check that before calling. - */ -#ifndef __U_BOOT__ -static int globhack(const char *src, int flags, glob_t *pglob) -{ - int cnt=0, pathc; - const char *s; - char *dest; - for (cnt=1, s=src; s && *s; s++) { - if (*s == '\\') s++; - cnt++; - } - dest = malloc(cnt); - if (!dest) return GLOB_NOSPACE; - if (!(flags & GLOB_APPEND)) { - pglob->gl_pathv=NULL; - pglob->gl_pathc=0; - pglob->gl_offs=0; - pglob->gl_offs=0; - } - pathc = ++pglob->gl_pathc; - pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); - if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; - pglob->gl_pathv[pathc-1]=dest; - pglob->gl_pathv[pathc]=NULL; - for (s=src; s && *s; s++, dest++) { - if (*s == '\\') s++; - *dest = *s; - } - *dest='\0'; - return 0; -} - -/* XXX broken if the last character is '\\', check that before calling */ -static int glob_needed(const char *s) -{ - for (; *s; s++) { - if (*s == '\\') s++; - if (strchr("*[?",*s)) return 1; - } - return 0; -} - -#if 0 -static void globprint(glob_t *pglob) -{ - int i; - debug_printf("glob_t at %p:\n", pglob); - debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", - pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); - for (i=0; igl_pathc; i++) - debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, - pglob->gl_pathv[i], pglob->gl_pathv[i]); -} -#endif - -static int xglob(o_string *dest, int flags, glob_t *pglob) -{ - int gr; - - /* short-circuit for null word */ - /* we can code this better when the debug_printf's are gone */ - if (dest->length == 0) { - if (dest->nonnull) { - /* bash man page calls this an "explicit" null */ - gr = globhack(dest->data, flags, pglob); - debug_printf("globhack returned %d\n",gr); - } else { - return 0; - } - } else if (glob_needed(dest->data)) { - gr = glob(dest->data, flags, NULL, pglob); - debug_printf("glob returned %d\n",gr); - if (gr == GLOB_NOMATCH) { - /* quote removal, or more accurately, backslash removal */ - gr = globhack(dest->data, flags, pglob); - debug_printf("globhack returned %d\n",gr); - } - } else { - gr = globhack(dest->data, flags, pglob); - debug_printf("globhack returned %d\n",gr); - } - if (gr == GLOB_NOSPACE) - error_msg_and_die("out of memory during glob"); - if (gr != 0) { /* GLOB_ABORTED ? */ - error_msg("glob(3) error %d",gr); - } - /* globprint(glob_target); */ - return gr; -} -#endif - -#ifdef __U_BOOT__ -static char *get_dollar_var(char ch); -#endif - -/* This is used to get/check local shell variables */ -char *get_local_var(const char *s) -{ - struct variables *cur; - - if (!s) - return NULL; - -#ifdef __U_BOOT__ - if (*s == '$') - return get_dollar_var(s[1]); -#endif - - for (cur = top_vars; cur; cur=cur->next) - if(strcmp(cur->name, s)==0) - return cur->value; - return NULL; -} - -/* This is used to set local shell variables - flg_export==0 if only local (not exporting) variable - flg_export==1 if "new" exporting environ - flg_export>1 if current startup environ (not call putenv()) */ -int set_local_var(const char *s, int flg_export) -{ - char *name, *value; - int result=0; - struct variables *cur; - -#ifdef __U_BOOT__ - /* might be possible! */ - if (!isalpha(*s)) - return -1; -#endif - - name=strdup(s); - -#ifdef __U_BOOT__ - if (getenv(name) != NULL) { - printf ("ERROR: " - "There is a global environment variable with the same name.\n"); - free(name); - return -1; - } -#endif - /* Assume when we enter this function that we are already in - * NAME=VALUE format. So the first order of business is to - * split 's' on the '=' into 'name' and 'value' */ - value = strchr(name, '='); - if (value == NULL && ++value == NULL) { - free(name); - return -1; - } - *value++ = 0; - - for(cur = top_vars; cur; cur = cur->next) { - if(strcmp(cur->name, name)==0) - break; - } - - if(cur) { - if(strcmp(cur->value, value)==0) { - if(flg_export>0 && cur->flg_export==0) - cur->flg_export=flg_export; - else - result++; - } else { - if(cur->flg_read_only) { - error_msg("%s: readonly variable", name); - result = -1; - } else { - if(flg_export>0 || cur->flg_export>1) - cur->flg_export=1; - free(cur->value); - - cur->value = strdup(value); - } - } - } else { - cur = malloc(sizeof(struct variables)); - if(!cur) { - result = -1; - } else { - cur->name = strdup(name); - if (cur->name == NULL) { - free(cur); - result = -1; - } else { - struct variables *bottom = top_vars; - cur->value = strdup(value); - cur->next = NULL; - cur->flg_export = flg_export; - cur->flg_read_only = 0; - while(bottom->next) bottom=bottom->next; - bottom->next = cur; - } - } - } - -#ifndef __U_BOOT__ - if(result==0 && cur->flg_export==1) { - *(value-1) = '='; - result = putenv(name); - } else { -#endif - free(name); -#ifndef __U_BOOT__ - if(result>0) /* equivalent to previous set */ - result = 0; - } -#endif - return result; -} - -void unset_local_var(const char *name) -{ - struct variables *cur; - - if (name) { - for (cur = top_vars; cur; cur=cur->next) { - if(strcmp(cur->name, name)==0) - break; - } - if (cur != NULL) { - struct variables *next = top_vars; - if(cur->flg_read_only) { - error_msg("%s: readonly variable", name); - return; - } else { -#ifndef __U_BOOT__ - if(cur->flg_export) - unsetenv(cur->name); -#endif - free(cur->name); - free(cur->value); - while (next->next != cur) - next = next->next; - next->next = cur->next; - } - free(cur); - } - } -} - -static int is_assignment(const char *s) -{ - if (s == NULL) - return 0; - - if (!isalpha(*s)) return 0; - ++s; - while(isalnum(*s) || *s=='_') ++s; - return *s=='='; -} - -#ifndef __U_BOOT__ -/* the src parameter allows us to peek forward to a possible &n syntax - * for file descriptor duplication, e.g., "2>&1". - * Return code is 0 normally, 1 if a syntax error is detected in src. - * Resource errors (in xmalloc) cause the process to exit */ -static int setup_redirect(struct p_context *ctx, int fd, redir_type style, - struct in_str *input) -{ - struct child_prog *child=ctx->child; - struct redir_struct *redir = child->redirects; - struct redir_struct *last_redir=NULL; - - /* Create a new redir_struct and drop it onto the end of the linked list */ - while(redir) { - last_redir=redir; - redir=redir->next; - } - redir = xmalloc(sizeof(struct redir_struct)); - redir->next=NULL; - redir->word.gl_pathv=NULL; - if (last_redir) { - last_redir->next=redir; - } else { - child->redirects=redir; - } - - redir->type=style; - redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; - - debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); - - /* Check for a '2>&1' type redirect */ - redir->dup = redirect_dup_num(input); - if (redir->dup == -2) return 1; /* syntax error */ - if (redir->dup != -1) { - /* Erik had a check here that the file descriptor in question - * is legit; I postpone that to "run time" - * A "-" representation of "close me" shows up as a -3 here */ - debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); - } else { - /* We do _not_ try to open the file that src points to, - * since we need to return and let src be expanded first. - * Set ctx->pending_redirect, so we know what to do at the - * end of the next parsed word. - */ - ctx->pending_redirect = redir; - } - return 0; -} -#endif - -static struct pipe *new_pipe(void) -{ - struct pipe *pi; - pi = xmalloc(sizeof(struct pipe)); - pi->num_progs = 0; - pi->progs = NULL; - pi->next = NULL; - pi->followup = 0; /* invalid */ - pi->r_mode = RES_NONE; - return pi; -} - -static void initialize_context(struct p_context *ctx) -{ - ctx->pipe=NULL; -#ifndef __U_BOOT__ - ctx->pending_redirect=NULL; -#endif - ctx->child=NULL; - ctx->list_head=new_pipe(); - ctx->pipe=ctx->list_head; - ctx->w=RES_NONE; - ctx->stack=NULL; -#ifdef __U_BOOT__ - ctx->old_flag=0; -#endif - done_command(ctx); /* creates the memory for working child */ -} - -/* normal return is 0 - * if a reserved word is found, and processed, return 1 - * should handle if, then, elif, else, fi, for, while, until, do, done. - * case, function, and select are obnoxious, save those for later. - */ -struct reserved_combo { - char *literal; - int code; - long flag; -}; -/* Mostly a list of accepted follow-up reserved words. - * FLAG_END means we are done with the sequence, and are ready - * to turn the compound list into a command. - * FLAG_START means the word must start a new compound list. - */ -static struct reserved_combo reserved_list[] = { - { "if", RES_IF, FLAG_THEN | FLAG_START }, - { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, - { "elif", RES_ELIF, FLAG_THEN }, - { "else", RES_ELSE, FLAG_FI }, - { "fi", RES_FI, FLAG_END }, - { "for", RES_FOR, FLAG_IN | FLAG_START }, - { "while", RES_WHILE, FLAG_DO | FLAG_START }, - { "until", RES_UNTIL, FLAG_DO | FLAG_START }, - { "in", RES_IN, FLAG_DO }, - { "do", RES_DO, FLAG_DONE }, - { "done", RES_DONE, FLAG_END } -}; -#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) - -static int reserved_word(o_string *dest, struct p_context *ctx) -{ - struct reserved_combo *r; - for (r=reserved_list; - rdata, r->literal) == 0) { - debug_printf("found reserved word %s, code %d\n",r->literal,r->code); - if (r->flag & FLAG_START) { - struct p_context *new = xmalloc(sizeof(struct p_context)); - debug_printf("push stack\n"); - if (ctx->w == RES_IN || ctx->w == RES_FOR) { - syntax(); - free(new); - ctx->w = RES_SNTX; - b_reset(dest); - return 1; - } - *new = *ctx; /* physical copy */ - initialize_context(ctx); - ctx->stack=new; - } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<code))) { - syntax(); - ctx->w = RES_SNTX; - b_reset(dest); - return 1; - } - ctx->w=r->code; - ctx->old_flag = r->flag; - if (ctx->old_flag & FLAG_END) { - struct p_context *old; - debug_printf("pop stack\n"); - done_pipe(ctx,PIPE_SEQ); - old = ctx->stack; - old->child->group = ctx->list_head; -#ifndef __U_BOOT__ - old->child->subshell = 0; -#endif - *ctx = *old; /* physical copy */ - free(old); - } - b_reset (dest); - return 1; - } - } - return 0; -} - -/* normal return is 0. - * Syntax or xglob errors return 1. */ -static int done_word(o_string *dest, struct p_context *ctx) -{ - struct child_prog *child=ctx->child; -#ifndef __U_BOOT__ - glob_t *glob_target; - int gr, flags = 0; -#else - char *str, *s; - int argc, cnt; -#endif - - debug_printf("done_word: %s %p\n", dest->data, child); - if (dest->length == 0 && !dest->nonnull) { - debug_printf(" true null, ignored\n"); - return 0; - } -#ifndef __U_BOOT__ - if (ctx->pending_redirect) { - glob_target = &ctx->pending_redirect->word; - } else { -#endif - if (child->group) { - syntax(); - return 1; /* syntax error, groups and arglists don't mix */ - } - if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { - debug_printf("checking %s for reserved-ness\n",dest->data); - if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; - } -#ifndef __U_BOOT__ - glob_target = &child->glob_result; - if (child->argv) flags |= GLOB_APPEND; -#else - for (cnt = 1, s = dest->data; s && *s; s++) { - if (*s == '\\') s++; - cnt++; - } - str = malloc(cnt); - if (!str) return 1; - if ( child->argv == NULL) { - child->argc=0; - } - argc = ++child->argc; - child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); - if (child->argv == NULL) return 1; - child->argv_nonnull = realloc(child->argv_nonnull, - (argc+1)*sizeof(*child->argv_nonnull)); - if (child->argv_nonnull == NULL) - return 1; - child->argv[argc-1]=str; - child->argv_nonnull[argc-1] = dest->nonnull; - child->argv[argc]=NULL; - child->argv_nonnull[argc] = 0; - for (s = dest->data; s && *s; s++,str++) { - if (*s == '\\') s++; - *str = *s; - } - *str = '\0'; -#endif -#ifndef __U_BOOT__ - } - gr = xglob(dest, flags, glob_target); - if (gr != 0) return 1; -#endif - - b_reset(dest); -#ifndef __U_BOOT__ - if (ctx->pending_redirect) { - ctx->pending_redirect=NULL; - if (glob_target->gl_pathc != 1) { - error_msg("ambiguous redirect"); - return 1; - } - } else { - child->argv = glob_target->gl_pathv; - } -#endif - if (ctx->w == RES_FOR) { - done_word(dest,ctx); - done_pipe(ctx,PIPE_SEQ); - } - return 0; -} - -/* The only possible error here is out of memory, in which case - * xmalloc exits. */ -static int done_command(struct p_context *ctx) -{ - /* The child is really already in the pipe structure, so - * advance the pipe counter and make a new, null child. - * Only real trickiness here is that the uncommitted - * child structure, to which ctx->child points, is not - * counted in pi->num_progs. */ - struct pipe *pi=ctx->pipe; - struct child_prog *prog=ctx->child; - - if (prog && prog->group == NULL - && prog->argv == NULL -#ifndef __U_BOOT__ - && prog->redirects == NULL) { -#else - ) { -#endif - debug_printf("done_command: skipping null command\n"); - return 0; - } else if (prog) { - pi->num_progs++; - debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); - } else { - debug_printf("done_command: initializing\n"); - } - pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); - - prog = pi->progs + pi->num_progs; -#ifndef __U_BOOT__ - prog->redirects = NULL; -#endif - prog->argv = NULL; - prog->argv_nonnull = NULL; -#ifndef __U_BOOT__ - prog->is_stopped = 0; -#endif - prog->group = NULL; -#ifndef __U_BOOT__ - prog->glob_result.gl_pathv = NULL; - prog->family = pi; -#endif - prog->sp = 0; - ctx->child = prog; - prog->type = ctx->type; - - /* but ctx->pipe and ctx->list_head remain unchanged */ - return 0; -} - -static int done_pipe(struct p_context *ctx, pipe_style type) -{ - struct pipe *new_p; - done_command(ctx); /* implicit closure of previous command */ - debug_printf("done_pipe, type %d\n", type); - ctx->pipe->followup = type; - ctx->pipe->r_mode = ctx->w; - new_p=new_pipe(); - ctx->pipe->next = new_p; - ctx->pipe = new_p; - ctx->child = NULL; - done_command(ctx); /* set up new pipe to accept commands */ - return 0; -} - -#ifndef __U_BOOT__ -/* peek ahead in the in_str to find out if we have a "&n" construct, - * as in "2>&1", that represents duplicating a file descriptor. - * returns either -2 (syntax error), -1 (no &), or the number found. - */ -static int redirect_dup_num(struct in_str *input) -{ - int ch, d=0, ok=0; - ch = b_peek(input); - if (ch != '&') return -1; - - b_getch(input); /* get the & */ - ch=b_peek(input); - if (ch == '-') { - b_getch(input); - return -3; /* "-" represents "close me" */ - } - while (isdigit(ch)) { - d = d*10+(ch-'0'); - ok=1; - b_getch(input); - ch = b_peek(input); - } - if (ok) return d; - - error_msg("ambiguous redirect"); - return -2; -} - -/* If a redirect is immediately preceded by a number, that number is - * supposed to tell which file descriptor to redirect. This routine - * looks for such preceding numbers. In an ideal world this routine - * needs to handle all the following classes of redirects... - * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo - * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo - * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo - * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo - * A -1 output from this program means no valid number was found, so the - * caller should use the appropriate default for this redirection. - */ -static int redirect_opt_num(o_string *o) -{ - int num; - - if (o->length==0) return -1; - for(num=0; numlength; num++) { - if (!isdigit(*(o->data+num))) { - return -1; - } - } - /* reuse num (and save an int) */ - num=atoi(o->data); - b_reset(o); - return num; -} - -FILE *generate_stream_from_list(struct pipe *head) -{ - FILE *pf; -#if 1 - int pid, channel[2]; - if (pipe(channel)<0) perror_msg_and_die("pipe"); - pid=fork(); - if (pid<0) { - perror_msg_and_die("fork"); - } else if (pid==0) { - close(channel[0]); - if (channel[1] != 1) { - dup2(channel[1],1); - close(channel[1]); - } -#if 0 -#define SURROGATE "surrogate response" - write(1,SURROGATE,sizeof(SURROGATE)); - _exit(run_list(head)); -#else - _exit(run_list_real(head)); /* leaks memory */ -#endif - } - debug_printf("forked child %d\n",pid); - close(channel[1]); - pf = fdopen(channel[0],"r"); - debug_printf("pipe on FILE *%p\n",pf); -#else - free_pipe_list(head,0); - pf=popen("echo surrogate response","r"); - debug_printf("started fake pipe on FILE *%p\n",pf); -#endif - return pf; -} - -/* this version hacked for testing purposes */ -/* return code is exit status of the process that is run. */ -static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) -{ - int retcode; - o_string result=NULL_O_STRING; - struct p_context inner; - FILE *p; - struct in_str pipe_str; - initialize_context(&inner); - - /* recursion to generate command */ - retcode = parse_stream(&result, &inner, input, subst_end); - if (retcode != 0) return retcode; /* syntax error or EOF */ - done_word(&result, &inner); - done_pipe(&inner, PIPE_SEQ); - b_free(&result); - - p=generate_stream_from_list(inner.list_head); - if (p==NULL) return 1; - mark_open(fileno(p)); - setup_file_in_str(&pipe_str, p); - - /* now send results of command back into original context */ - retcode = parse_stream(dest, ctx, &pipe_str, '\0'); - /* XXX In case of a syntax error, should we try to kill the child? - * That would be tough to do right, so just read until EOF. */ - if (retcode == 1) { - while (b_getch(&pipe_str)!=EOF) { /* discard */ }; - } - - debug_printf("done reading from pipe, pclose()ing\n"); - /* This is the step that wait()s for the child. Should be pretty - * safe, since we just read an EOF from its stdout. We could try - * to better, by using wait(), and keeping track of background jobs - * at the same time. That would be a lot of work, and contrary - * to the KISS philosophy of this program. */ - mark_closed(fileno(p)); - retcode=pclose(p); - free_pipe_list(inner.list_head,0); - debug_printf("pclosed, retcode=%d\n",retcode); - /* XXX this process fails to trim a single trailing newline */ - return retcode; -} - -static int parse_group(o_string *dest, struct p_context *ctx, - struct in_str *input, int ch) -{ - int rcode, endch=0; - struct p_context sub; - struct child_prog *child = ctx->child; - if (child->argv) { - syntax(); - return 1; /* syntax error, groups and arglists don't mix */ - } - initialize_context(&sub); - switch(ch) { - case '(': endch=')'; child->subshell=1; break; - case '{': endch='}'; break; - default: syntax(); /* really logic error */ - } - rcode=parse_stream(dest,&sub,input,endch); - done_word(dest,&sub); /* finish off the final word in the subcontext */ - done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ - child->group = sub.list_head; - return rcode; - /* child remains "open", available for possible redirects */ -} -#endif - -/* basically useful version until someone wants to get fancier, - * see the bash man page under "Parameter Expansion" */ -static char *lookup_param(char *src) -{ - char *p; - char *sep; - char *default_val = NULL; - int assign = 0; - int expand_empty = 0; - - if (!src) - return NULL; - - sep = strchr(src, ':'); - - if (sep) { - *sep = '\0'; - if (*(sep + 1) == '-') - default_val = sep+2; - if (*(sep + 1) == '=') { - default_val = sep+2; - assign = 1; - } - if (*(sep + 1) == '+') { - default_val = sep+2; - expand_empty = 1; - } - } - - p = getenv(src); - if (!p) - p = get_local_var(src); - - if (!p || strlen(p) == 0) { - p = default_val; - if (assign) { - char *var = malloc(strlen(src)+strlen(default_val)+2); - if (var) { - sprintf(var, "%s=%s", src, default_val); - set_local_var(var, 0); - } - free(var); - } - } else if (expand_empty) { - p += strlen(p); - } - - if (sep) - *sep = ':'; - - return p; -} - -#ifdef __U_BOOT__ -static char *get_dollar_var(char ch) -{ - static char buf[40]; - - buf[0] = '\0'; - switch (ch) { - case '?': - sprintf(buf, "%u", (unsigned int)last_return_code); - break; - default: - return NULL; - } - return buf; -} -#endif - -/* return code: 0 for OK, 1 for syntax error */ -static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) -{ -#ifndef __U_BOOT__ - int i, advance=0; -#else - int advance=0; -#endif -#ifndef __U_BOOT__ - char sep[]=" "; -#endif - int ch = input->peek(input); /* first character after the $ */ - debug_printf("handle_dollar: ch=%c\n",ch); - if (isalpha(ch)) { - b_addchr(dest, SPECIAL_VAR_SYMBOL); - ctx->child->sp++; - while(ch=b_peek(input),isalnum(ch) || ch=='_') { - b_getch(input); - b_addchr(dest,ch); - } - b_addchr(dest, SPECIAL_VAR_SYMBOL); -#ifndef __U_BOOT__ - } else if (isdigit(ch)) { - i = ch-'0'; /* XXX is $0 special? */ - if (i 0) b_adduint(dest, last_bg_pid); - advance = 1; - break; -#endif - case '?': -#ifndef __U_BOOT__ - b_adduint(dest,last_return_code); -#else - ctx->child->sp++; - b_addchr(dest, SPECIAL_VAR_SYMBOL); - b_addchr(dest, '$'); - b_addchr(dest, '?'); - b_addchr(dest, SPECIAL_VAR_SYMBOL); -#endif - advance = 1; - break; -#ifndef __U_BOOT__ - case '#': - b_adduint(dest,global_argc ? global_argc-1 : 0); - advance = 1; - break; -#endif - case '{': - b_addchr(dest, SPECIAL_VAR_SYMBOL); - ctx->child->sp++; - b_getch(input); - /* XXX maybe someone will try to escape the '}' */ - while(ch=b_getch(input),ch!=EOF && ch!='}') { - b_addchr(dest,ch); - } - if (ch != '}') { - syntax(); - return 1; - } - b_addchr(dest, SPECIAL_VAR_SYMBOL); - break; -#ifndef __U_BOOT__ - case '(': - b_getch(input); - process_command_subs(dest, ctx, input, ')'); - break; - case '*': - sep[0]=ifs[0]; - for (i=1; iquote); - } - /* Eat the character if the flag was set. If the compiler - * is smart enough, we could substitute "b_getch(input);" - * for all the "advance = 1;" above, and also end up with - * a nice size-optimized program. Hah! That'll be the day. - */ - if (advance) b_getch(input); - return 0; -} - -#ifndef __U_BOOT__ -int parse_string(o_string *dest, struct p_context *ctx, const char *src) -{ - struct in_str foo; - setup_string_in_str(&foo, src); - return parse_stream(dest, ctx, &foo, '\0'); -} -#endif - -/* return code is 0 for normal exit, 1 for syntax error */ -static int parse_stream(o_string *dest, struct p_context *ctx, - struct in_str *input, int end_trigger) -{ - unsigned int ch, m; -#ifndef __U_BOOT__ - int redir_fd; - redir_type redir_style; -#endif - int next; - - /* Only double-quote state is handled in the state variable dest->quote. - * A single-quote triggers a bypass of the main loop until its mate is - * found. When recursing, quote state is passed in via dest->quote. */ - - debug_printf("parse_stream, end_trigger=%d\n",end_trigger); - while ((ch=b_getch(input))!=EOF) { - m = map[ch]; -#ifdef __U_BOOT__ - if (input->__promptme == 0) return 1; -#endif - next = (ch == '\n') ? 0 : b_peek(input); - - debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", - ch >= ' ' ? ch : '.', ch, m, - dest->quote, ctx->stack == NULL ? '*' : '.'); - - if (m==0 || ((m==1 || m==2) && dest->quote)) { - b_addqchr(dest, ch, dest->quote); - } else { - if (m==2) { /* unquoted IFS */ - if (done_word(dest, ctx)) { - return 1; - } - /* If we aren't performing a substitution, treat a newline as a - * command separator. */ - if (end_trigger != '\0' && ch=='\n') - done_pipe(ctx,PIPE_SEQ); - } - if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { - debug_printf("leaving parse_stream (triggered)\n"); - return 0; - } -#if 0 - if (ch=='\n') { - /* Yahoo! Time to run with it! */ - done_pipe(ctx,PIPE_SEQ); - run_list(ctx->list_head); - initialize_context(ctx); - } -#endif - if (m!=2) switch (ch) { - case '#': - if (dest->length == 0 && !dest->quote) { - while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } - } else { - b_addqchr(dest, ch, dest->quote); - } - break; - case '\\': - if (next == EOF) { - syntax(); - return 1; - } - b_addqchr(dest, '\\', dest->quote); - b_addqchr(dest, b_getch(input), dest->quote); - break; - case '$': - if (handle_dollar(dest, ctx, input)!=0) return 1; - break; - case '\'': - dest->nonnull = 1; - while(ch=b_getch(input),ch!=EOF && ch!='\'') { -#ifdef __U_BOOT__ - if(input->__promptme == 0) return 1; -#endif - b_addchr(dest,ch); - } - if (ch==EOF) { - syntax(); - return 1; - } - break; - case '"': - dest->nonnull = 1; - dest->quote = !dest->quote; - break; -#ifndef __U_BOOT__ - case '`': - process_command_subs(dest, ctx, input, '`'); - break; - case '>': - redir_fd = redirect_opt_num(dest); - done_word(dest, ctx); - redir_style=REDIRECT_OVERWRITE; - if (next == '>') { - redir_style=REDIRECT_APPEND; - b_getch(input); - } else if (next == '(') { - syntax(); /* until we support >(list) Process Substitution */ - return 1; - } - setup_redirect(ctx, redir_fd, redir_style, input); - break; - case '<': - redir_fd = redirect_opt_num(dest); - done_word(dest, ctx); - redir_style=REDIRECT_INPUT; - if (next == '<') { - redir_style=REDIRECT_HEREIS; - b_getch(input); - } else if (next == '>') { - redir_style=REDIRECT_IO; - b_getch(input); - } else if (next == '(') { - syntax(); /* until we support <(list) Process Substitution */ - return 1; - } - setup_redirect(ctx, redir_fd, redir_style, input); - break; -#endif - case ';': - done_word(dest, ctx); - done_pipe(ctx,PIPE_SEQ); - break; - case '&': - done_word(dest, ctx); - if (next=='&') { - b_getch(input); - done_pipe(ctx,PIPE_AND); - } else { -#ifndef __U_BOOT__ - done_pipe(ctx,PIPE_BG); -#else - syntax_err(); - return 1; -#endif - } - break; - case '|': - done_word(dest, ctx); - if (next=='|') { - b_getch(input); - done_pipe(ctx,PIPE_OR); - } else { - /* we could pick up a file descriptor choice here - * with redirect_opt_num(), but bash doesn't do it. - * "echo foo 2| cat" yields "foo 2". */ -#ifndef __U_BOOT__ - done_command(ctx); -#else - syntax_err(); - return 1; -#endif - } - break; -#ifndef __U_BOOT__ - case '(': - case '{': - if (parse_group(dest, ctx, input, ch)!=0) return 1; - break; - case ')': - case '}': - syntax(); /* Proper use of this character caught by end_trigger */ - return 1; - break; -#endif - case SUBSTED_VAR_SYMBOL: - dest->nonnull = 1; - while (ch = b_getch(input), ch != EOF && - ch != SUBSTED_VAR_SYMBOL) { - debug_printf("subst, pass=%d\n", ch); - if (input->__promptme == 0) - return 1; - b_addchr(dest, ch); - } - debug_printf("subst, term=%d\n", ch); - if (ch == EOF) { - syntax(); - return 1; - } - break; - default: - syntax(); /* this is really an internal logic error */ - return 1; - } - } - } - /* complain if quote? No, maybe we just finished a command substitution - * that was quoted. Example: - * $ echo "`cat foo` plus more" - * and we just got the EOF generated by the subshell that ran "cat foo" - * The only real complaint is if we got an EOF when end_trigger != '\0', - * that is, we were really supposed to get end_trigger, and never got - * one before the EOF. Can't use the standard "syntax error" return code, - * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ - debug_printf("leaving parse_stream (EOF)\n"); - if (end_trigger != '\0') return -1; - return 0; -} - -static void mapset(const unsigned char *set, int code) -{ - const unsigned char *s; - for (s=set; *s; s++) map[*s] = code; -} - -static void update_ifs_map(void) -{ - /* char *ifs and char map[256] are both globals. */ - ifs = (uchar *)getenv("IFS"); - if (ifs == NULL) ifs=(uchar *)" \t\n"; - /* Precompute a list of 'flow through' behavior so it can be treated - * quickly up front. Computation is necessary because of IFS. - * Special case handling of IFS == " \t\n" is not implemented. - * The map[] array only really needs two bits each, and on most machines - * that would be faster because of the reduced L1 cache footprint. - */ - memset(map,0,sizeof(map)); /* most characters flow through always */ -#ifndef __U_BOOT__ - mapset((uchar *)"\\$'\"`", 3); /* never flow through */ - mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ -#else - { - uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; - mapset(subst, 3); /* never flow through */ - } - mapset((uchar *)"\\$'\"", 3); /* never flow through */ - mapset((uchar *)";&|#", 1); /* flow through if quoted */ -#endif - mapset(ifs, 2); /* also flow through if quoted */ -} - -/* most recursion does not come through here, the exeception is - * from builtin_source() */ -static int parse_stream_outer(struct in_str *inp, int flag) -{ - - struct p_context ctx; - o_string temp=NULL_O_STRING; - int rcode; -#ifdef __U_BOOT__ - int code = 0; -#endif - do { - ctx.type = flag; - initialize_context(&ctx); - update_ifs_map(); - if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); - inp->promptmode=1; - rcode = parse_stream(&temp, &ctx, inp, '\n'); -#ifdef __U_BOOT__ - if (rcode == 1) flag_repeat = 0; -#endif - if (rcode != 1 && ctx.old_flag != 0) { - syntax(); -#ifdef __U_BOOT__ - flag_repeat = 0; -#endif - } - if (rcode != 1 && ctx.old_flag == 0) { - done_word(&temp, &ctx); - done_pipe(&ctx,PIPE_SEQ); -#ifndef __U_BOOT__ - run_list(ctx.list_head); -#else - code = run_list(ctx.list_head); - if (code == -2) { /* exit */ - b_free(&temp); - code = 0; - /* XXX hackish way to not allow exit from main loop */ - if (inp->peek == file_peek) { - printf("exit not allowed from main input shell.\n"); - continue; - } - break; - } - if (code == -1) - flag_repeat = 0; -#endif - } else { - if (ctx.old_flag != 0) { - free(ctx.stack); - b_reset(&temp); - } -#ifdef __U_BOOT__ - if (inp->__promptme == 0) printf("\n"); - inp->__promptme = 1; -#endif - temp.nonnull = 0; - temp.quote = 0; - inp->p = NULL; - free_pipe_list(ctx.list_head,0); - } - b_free(&temp); - } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */ -#ifndef __U_BOOT__ - return 0; -#else - return (code != 0) ? 1 : 0; -#endif /* __U_BOOT__ */ -} - -#ifndef __U_BOOT__ -static int parse_string_outer(const char *s, int flag) -#else -int parse_string_outer(const char *s, int flag) -#endif /* __U_BOOT__ */ -{ - struct in_str input; -#ifdef __U_BOOT__ - char *p = NULL; - int rcode; - if ( !s || !*s) - return 1; - if (!(p = strchr(s, '\n')) || *++p) { - p = xmalloc(strlen(s) + 2); - strcpy(p, s); - strcat(p, "\n"); - setup_string_in_str(&input, p); - rcode = parse_stream_outer(&input, flag); - free(p); - return rcode; - } else { -#endif - setup_string_in_str(&input, s); - return parse_stream_outer(&input, flag); -#ifdef __U_BOOT__ - } -#endif -} - -#ifndef __U_BOOT__ -static int parse_file_outer(FILE *f) -#else -int parse_file_outer(void) -#endif -{ - int rcode; - struct in_str input; -#ifndef __U_BOOT__ - setup_file_in_str(&input, f); -#else - setup_file_in_str(&input); -#endif - rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); - return rcode; -} - -#ifdef __U_BOOT__ -#ifdef CONFIG_NEEDS_MANUAL_RELOC -static void u_boot_hush_reloc(void) -{ - unsigned long addr; - struct reserved_combo *r; - - for (r=reserved_list; rliteral) + gd->reloc_off; - r->literal = (char *)addr; - } -} -#endif - -int u_boot_hush_start(void) -{ - if (top_vars == NULL) { - top_vars = malloc(sizeof(struct variables)); - top_vars->name = "HUSH_VERSION"; - top_vars->value = "0.01"; - top_vars->next = NULL; - top_vars->flg_export = 0; - top_vars->flg_read_only = 1; -#ifdef CONFIG_NEEDS_MANUAL_RELOC - u_boot_hush_reloc(); -#endif - } - return 0; -} - -static void *xmalloc(size_t size) -{ - void *p = NULL; - - if (!(p = malloc(size))) { - printf("ERROR : memory not allocated\n"); - for(;;); - } - return p; -} - -static void *xrealloc(void *ptr, size_t size) -{ - void *p = NULL; - - if (!(p = realloc(ptr, size))) { - printf("ERROR : memory not allocated\n"); - for(;;); - } - return p; -} -#endif /* __U_BOOT__ */ - -#ifndef __U_BOOT__ -/* Make sure we have a controlling tty. If we get started under a job - * aware app (like bash for example), make sure we are now in charge so - * we don't fight over who gets the foreground */ -static void setup_job_control(void) -{ - static pid_t shell_pgrp; - /* Loop until we are in the foreground. */ - while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) - kill (- shell_pgrp, SIGTTIN); - - /* Ignore interactive and job-control signals. */ - signal(SIGINT, SIG_IGN); - signal(SIGQUIT, SIG_IGN); - signal(SIGTERM, SIG_IGN); - signal(SIGTSTP, SIG_IGN); - signal(SIGTTIN, SIG_IGN); - signal(SIGTTOU, SIG_IGN); - signal(SIGCHLD, SIG_IGN); - - /* Put ourselves in our own process group. */ - setsid(); - shell_pgrp = getpid (); - setpgid (shell_pgrp, shell_pgrp); - - /* Grab control of the terminal. */ - tcsetpgrp(shell_terminal, shell_pgrp); -} - -int hush_main(int argc, char * const *argv) -{ - int opt; - FILE *input; - char **e = environ; - - /* XXX what should these be while sourcing /etc/profile? */ - global_argc = argc; - global_argv = argv; - - /* (re?) initialize globals. Sometimes hush_main() ends up calling - * hush_main(), therefore we cannot rely on the BSS to zero out this - * stuff. Reset these to 0 every time. */ - ifs = NULL; - /* map[] is taken care of with call to update_ifs_map() */ - fake_mode = 0; - interactive = 0; - close_me_head = NULL; - last_bg_pid = 0; - job_list = NULL; - last_jobid = 0; - - /* Initialize some more globals to non-zero values */ - set_cwd(); -#ifdef CONFIG_FEATURE_COMMAND_EDITING - cmdedit_set_initial_prompt(); -#else - PS1 = NULL; -#endif - PS2 = "> "; - - /* initialize our shell local variables with the values - * currently living in the environment */ - if (e) { - for (; *e; e++) - set_local_var(*e, 2); /* without call putenv() */ - } - - last_return_code=EXIT_SUCCESS; - - - if (argv[0] && argv[0][0] == '-') { - debug_printf("\nsourcing /etc/profile\n"); - if ((input = fopen("/etc/profile", "r")) != NULL) { - mark_open(fileno(input)); - parse_file_outer(input); - mark_closed(fileno(input)); - fclose(input); - } - } - input=stdin; - - while ((opt = getopt(argc, argv, "c:xif")) > 0) { - switch (opt) { - case 'c': - { - global_argv = argv+optind; - global_argc = argc-optind; - opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); - goto final_return; - } - break; - case 'i': - interactive++; - break; - case 'f': - fake_mode++; - break; - default: -#ifndef BB_VER - fprintf(stderr, "Usage: sh [FILE]...\n" - " or: sh -c command [args]...\n\n"); - exit(EXIT_FAILURE); -#else - show_usage(); -#endif - } - } - /* A shell is interactive if the `-i' flag was given, or if all of - * the following conditions are met: - * no -c command - * no arguments remaining or the -s flag given - * standard input is a terminal - * standard output is a terminal - * Refer to Posix.2, the description of the `sh' utility. */ - if (argv[optind]==NULL && input==stdin && - isatty(fileno(stdin)) && isatty(fileno(stdout))) { - interactive++; - } - - debug_printf("\ninteractive=%d\n", interactive); - if (interactive) { - /* Looks like they want an interactive shell */ -#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET - printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); - printf( "Enter 'help' for a list of built-in commands.\n\n"); -#endif - setup_job_control(); - } - - if (argv[optind]==NULL) { - opt=parse_file_outer(stdin); - goto final_return; - } - - debug_printf("\nrunning script '%s'\n", argv[optind]); - global_argv = argv+optind; - global_argc = argc-optind; - input = xfopen(argv[optind], "r"); - opt = parse_file_outer(input); - -#ifdef CONFIG_FEATURE_CLEAN_UP - fclose(input); - if (cwd && cwd != unknown) - free((char*)cwd); - { - struct variables *cur, *tmp; - for(cur = top_vars; cur; cur = tmp) { - tmp = cur->next; - if (!cur->flg_read_only) { - free(cur->name); - free(cur->value); - free(cur); - } - } - } -#endif - -final_return: - return(opt?opt:last_return_code); -} -#endif - -static char *insert_var_value(char *inp) -{ - return insert_var_value_sub(inp, 0); -} - -static char *insert_var_value_sub(char *inp, int tag_subst) -{ - int res_str_len = 0; - int len; - int done = 0; - char *p, *p1, *res_str = NULL; - - while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { - /* check the beginning of the string for normal charachters */ - if (p != inp) { - /* copy any charachters to the result string */ - len = p - inp; - res_str = xrealloc(res_str, (res_str_len + len)); - strncpy((res_str + res_str_len), inp, len); - res_str_len += len; - } - inp = ++p; - /* find the ending marker */ - p = strchr(inp, SPECIAL_VAR_SYMBOL); - *p = '\0'; - /* look up the value to substitute */ - if ((p1 = lookup_param(inp))) { - if (tag_subst) - len = res_str_len + strlen(p1) + 2; - else - len = res_str_len + strlen(p1); - res_str = xrealloc(res_str, (1 + len)); - if (tag_subst) { - /* - * copy the variable value to the result - * string - */ - strcpy((res_str + res_str_len + 1), p1); - - /* - * mark the replaced text to be accepted as - * is - */ - res_str[res_str_len] = SUBSTED_VAR_SYMBOL; - res_str[res_str_len + 1 + strlen(p1)] = - SUBSTED_VAR_SYMBOL; - } else - /* - * copy the variable value to the result - * string - */ - strcpy((res_str + res_str_len), p1); - - res_str_len = len; - } - *p = SPECIAL_VAR_SYMBOL; - inp = ++p; - done = 1; - } - if (done) { - res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); - strcpy((res_str + res_str_len), inp); - while ((p = strchr(res_str, '\n'))) { - *p = ' '; - } - } - return (res_str == NULL) ? inp : res_str; -} - -static char **make_list_in(char **inp, char *name) -{ - int len, i; - int name_len = strlen(name); - int n = 0; - char **list; - char *p1, *p2, *p3; - - /* create list of variable values */ - list = xmalloc(sizeof(*list)); - for (i = 0; inp[i]; i++) { - p3 = insert_var_value(inp[i]); - p1 = p3; - while (*p1) { - if ((*p1 == ' ')) { - p1++; - continue; - } - if ((p2 = strchr(p1, ' '))) { - len = p2 - p1; - } else { - len = strlen(p1); - p2 = p1 + len; - } - /* we use n + 2 in realloc for list,because we add - * new element and then we will add NULL element */ - list = xrealloc(list, sizeof(*list) * (n + 2)); - list[n] = xmalloc(2 + name_len + len); - strcpy(list[n], name); - strcat(list[n], "="); - strncat(list[n], p1, len); - list[n++][name_len + len + 1] = '\0'; - p1 = p2; - } - if (p3 != inp[i]) free(p3); - } - list[n] = NULL; - return list; -} - -/* - * Make new string for parser - * inp - array of argument strings to flatten - * nonnull - indicates argument was quoted when originally parsed - */ -static char *make_string(char **inp, int *nonnull) -{ - char *p; - char *str = NULL; - int n; - int len = 2; - char *noeval_str; - int noeval = 0; - - noeval_str = get_local_var("HUSH_NO_EVAL"); - if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') - noeval = 1; - for (n = 0; inp[n]; n++) { - p = insert_var_value_sub(inp[n], noeval); - str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); - if (n) { - strcat(str, " "); - } else { - *str = '\0'; - } - if (nonnull[n]) - strcat(str, "'"); - strcat(str, p); - if (nonnull[n]) - strcat(str, "'"); - len = strlen(str) + 3; - if (p != inp[n]) free(p); - } - len = strlen(str); - *(str + len) = '\n'; - *(str + len + 1) = '\0'; - return str; -} - -#ifdef __U_BOOT__ -static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, - char * const argv[]) -{ - int i, k; - int rcode = 0; - struct variables *cur; - - if (argc == 1) { /* Print all env variables */ - for (cur = top_vars; cur; cur = cur->next) { - printf ("%s=%s\n", cur->name, cur->value); - if (ctrlc ()) { - puts ("\n ** Abort\n"); - return 1; - } - } - return 0; - } - for (i = 1; i < argc; ++i) { /* print single env variables */ - char *name = argv[i]; - - k = -1; - for (cur = top_vars; cur; cur = cur->next) { - if(strcmp (cur->name, name) == 0) { - k = 0; - printf ("%s=%s\n", cur->name, cur->value); - } - if (ctrlc ()) { - puts ("\n ** Abort\n"); - return 1; - } - } - if (k < 0) { - printf ("## Error: \"%s\" not defined\n", name); - rcode ++; - } - } - return rcode; -} - -U_BOOT_CMD( - showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, - "print local hushshell variables", - "\n - print values of all hushshell variables\n" - "showvar name ...\n" - " - print value of hushshell variable 'name'" -); - -#endif -/****************************************************************************/ diff --git a/common/main.c b/common/main.c index 9bee7bd..a80fb7c 100644 --- a/common/main.c +++ b/common/main.c @@ -14,7 +14,7 @@ #include #include #include -#include +#include #include #include #include diff --git a/include/cli_hush.h b/include/cli_hush.h new file mode 100644 index 0000000..4951eef --- /dev/null +++ b/include/cli_hush.h @@ -0,0 +1,26 @@ +/* + * (C) Copyright 2001 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _CLI_HUSH_H_ +#define _CLI_HUSH_H_ + +#define FLAG_EXIT_FROM_LOOP 1 +#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ +#define FLAG_REPARSING (1 << 2) /* >=2nd pass */ + +extern int u_boot_hush_start(void); +extern int parse_string_outer(const char *, int); +extern int parse_file_outer(void); + +int set_local_var(const char *s, int flg_export); +void unset_local_var(const char *name); +char *get_local_var(const char *s); + +#if defined(CONFIG_HUSH_INIT_VAR) +extern int hush_init_var (void); +#endif +#endif diff --git a/include/hush.h b/include/hush.h deleted file mode 100644 index 595303a..0000000 --- a/include/hush.h +++ /dev/null @@ -1,26 +0,0 @@ -/* - * (C) Copyright 2001 - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#ifndef _HUSH_H_ -#define _HUSH_H_ - -#define FLAG_EXIT_FROM_LOOP 1 -#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */ -#define FLAG_REPARSING (1 << 2) /* >=2nd pass */ - -extern int u_boot_hush_start(void); -extern int parse_string_outer(const char *, int); -extern int parse_file_outer(void); - -int set_local_var(const char *s, int flg_export); -void unset_local_var(const char *name); -char *get_local_var(const char *s); - -#if defined(CONFIG_HUSH_INIT_VAR) -extern int hush_init_var (void); -#endif -#endif -- cgit v0.10.2