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| author | Daisuke Nojiri <dnojiri@chromium.org> | 2019-09-20 12:12:06 -0700 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2019-10-01 07:41:19 +0000 |
| commit | 620b7164dddf12df27d5380d647c921853c036dc (patch) | |
| tree | e16ca0c0cac257259b599133d0f10eccde583b9f /common | |
| parent | 34b58efd6a434a6530a224458a00ec207ed9ba88 (diff) | |
| download | chrome-ec-620b7164dddf12df27d5380d647c921853c036dc.tar.gz | |
utils: Add strstr
The strstr API searches for s2 in s1 and returns the pointer to the
substring found in s1.
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
BUG=none
BRANCH=none
TEST=make run-utils_str
Change-Id: I30f5e8d03e304d28dd6e9bfeebfcaeee2e79ea85
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1818727
Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
Auto-Submit: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Jett Rink <jettrink@chromium.org>
Commit-Queue: Jett Rink <jettrink@chromium.org>
Diffstat (limited to 'common')
| -rw-r--r-- | common/util.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/common/util.c b/common/util.c index 40a107883e..b9f11aad27 100644 --- a/common/util.c +++ b/common/util.c @@ -94,6 +94,31 @@ __stdlib_compat int strncasecmp(const char *s1, const char *s2, size_t size) } +__stdlib_compat char *strstr(const char *s1, const char *s2) +{ + const char *p, *q, *r; + size_t len1 = strlen(s1); + size_t len2 = strlen(s2); + + if (len1 == 0 || len2 == 0 || len1 < len2) + return NULL; + + r = s1 + len1 - len2 + 1; + for (; s1 < r; s1++) { + if (*s1 == *s2) { + p = s1 + 1; + q = s2 + 1; + for (; q < s2 + len2;) { + if (*p++ != *q++) + break; + } + if (*q == '\0') + return (char *)s1; + } + } + return NULL; +} + __stdlib_compat int atoi(const char *nptr) { int result = 0; |