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authorIngo Molnar <mingo@elte.hu>2009-06-06 18:33:43 (GMT)
committerIngo Molnar <mingo@elte.hu>2009-06-06 18:33:43 (GMT)
commit864709302a80f26fa9da3be5b47304f0b8bae192 (patch)
tree8c2bab78f141fe43a38914bd3e3aae0a88f958e5 /tools/perf/util/string.c
parent75b5032212641f6d38ac041416945e70da833b68 (diff)
downloadlinux-864709302a80f26fa9da3be5b47304f0b8bae192.tar.xz
perf_counter tools: Move from Documentation/perf_counter/ to tools/perf/
Several people have suggested that 'perf' has become a full-fledged tool that should be moved out of Documentation/. Move it to the (new) tools/ directory. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util/string.c')
-rw-r--r--tools/perf/util/string.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
new file mode 100644
index 0000000..ec33c0c
--- /dev/null
+++ b/tools/perf/util/string.c
@@ -0,0 +1,34 @@
+#include "string.h"
+
+static int hex(char ch)
+{
+ if ((ch >= '0') && (ch <= '9'))
+ return ch - '0';
+ if ((ch >= 'a') && (ch <= 'f'))
+ return ch - 'a' + 10;
+ if ((ch >= 'A') && (ch <= 'F'))
+ return ch - 'A' + 10;
+ return -1;
+}
+
+/*
+ * While we find nice hex chars, build a long_val.
+ * Return number of chars processed.
+ */
+int hex2u64(const char *ptr, __u64 *long_val)
+{
+ const char *p = ptr;
+ *long_val = 0;
+
+ while (*p) {
+ const int hex_val = hex(*p);
+
+ if (hex_val < 0)
+ break;
+
+ *long_val = (*long_val << 4) | hex_val;
+ p++;
+ }
+
+ return p - ptr;
+}