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author | Du, Changbin <changbin.du@gmail.com> | 2014-01-23 23:54:12 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-24 00:36:55 (GMT) |
commit | aace05097a0fd467230e39acb148be0fdaa90068 (patch) | |
tree | ca2e61621bcb24ad83f3f145987c8ffd5c28c65b | |
parent | 0d9dfc23f4d8c17365c84eb48ecca28b963ba192 (diff) | |
download | linux-aace05097a0fd467230e39acb148be0fdaa90068.tar.xz |
lib/parser.c: add match_wildcard() function
match_wildcard function is a simple implementation of wildcard
matching algorithm. It only supports two usual wildcardes:
'*' - matches zero or more characters
'?' - matches one character
This algorithm is safe since it is non-recursive.
Signed-off-by: Du, Changbin <changbin.du@gmail.com>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | include/linux/parser.h | 1 | ||||
-rw-r--r-- | lib/parser.c | 51 |
2 files changed, 52 insertions, 0 deletions
diff --git a/include/linux/parser.h b/include/linux/parser.h index ea2281e..39d5b79 100644 --- a/include/linux/parser.h +++ b/include/linux/parser.h @@ -29,5 +29,6 @@ int match_token(char *, const match_table_t table, substring_t args[]); int match_int(substring_t *, int *result); int match_octal(substring_t *, int *result); int match_hex(substring_t *, int *result); +bool match_wildcard(const char *pattern, const char *str); size_t match_strlcpy(char *, const substring_t *, size_t); char *match_strdup(const substring_t *); diff --git a/lib/parser.c b/lib/parser.c index 807b2aa..ee52955 100644 --- a/lib/parser.c +++ b/lib/parser.c @@ -193,6 +193,56 @@ int match_hex(substring_t *s, int *result) } /** + * match_wildcard: - parse if a string matches given wildcard pattern + * @pattern: wildcard pattern + * @str: the string to be parsed + * + * Description: Parse the string @str to check if matches wildcard + * pattern @pattern. The pattern may contain two type wildcardes: + * '*' - matches zero or more characters + * '?' - matches one character + * If it's matched, return true, else return false. + */ +bool match_wildcard(const char *pattern, const char *str) +{ + const char *s = str; + const char *p = pattern; + bool star = false; + + while (*s) { + switch (*p) { + case '?': + s++; + p++; + break; + case '*': + star = true; + str = s; + if (!*++p) + return true; + pattern = p; + break; + default: + if (*s == *p) { + s++; + p++; + } else { + if (!star) + return false; + str++; + s = str; + p = pattern; + } + break; + } + } + + if (*p == '*') + ++p; + return !*p; +} + +/** * match_strlcpy: - Copy the characters from a substring_t to a sized buffer * @dest: where to copy to * @src: &substring_t to copy @@ -235,5 +285,6 @@ EXPORT_SYMBOL(match_token); EXPORT_SYMBOL(match_int); EXPORT_SYMBOL(match_octal); EXPORT_SYMBOL(match_hex); +EXPORT_SYMBOL(match_wildcard); EXPORT_SYMBOL(match_strlcpy); EXPORT_SYMBOL(match_strdup); |