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lib: Add implementation for strrchr

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Signed-off-by: Jaakko Hannikainen <jaakko.hannikainen@intel.com>
Change-Id: I57c549fae0fa8b2321794e9256da63b0a2fe6eaf
This commit is contained in:
Jaakko Hannikainen 2016-08-24 14:56:02 +03:00 • committed by Andrew Boie
commit 24a2fb19f9
2 changed files with 21 additions and 0 deletions
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1
lib/libc/minimal/include/string.h
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@ -29,6 +29,7 @@ extern "C" {
extern char *strcpy(char *_Restrict d, const char *_Restrict s); extern char *strcpy(char *_Restrict d, const char *_Restrict s);
extern char *strncpy(char *_Restrict d, const char *_Restrict s, size_t n); extern char *strncpy(char *_Restrict d, const char *_Restrict s, size_t n);
extern char *strchr(const char *s, int c); extern char *strchr(const char *s, int c);
extern char *strrchr(const char *s, int c);
extern size_t strlen(const char *s); extern size_t strlen(const char *s);
extern int strcmp(const char *s1, const char *s2); extern int strcmp(const char *s1, const char *s2);
extern int strncmp(const char *s1, const char *s2, size_t n); extern int strncmp(const char *s1, const char *s2, size_t n);

20
lib/libc/minimal/source/string/string.c
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@ -84,6 +84,26 @@ char *strchr(const char *s, int c)
return (*s == tmp) ? (char *) s : NULL; return (*s == tmp) ? (char *) s : NULL;
} }
/**
*
* @brief String scanning operation
*
* @return pointer to last instance of found byte, or NULL if not found
*/
char *strrchr(const char *s, int c)
{
char *match = NULL;
do {
if (*s == (char)c) {
match = (char *)s;
}
} while (*s++);
return match;
}
/** /**
* *
* @brief Get string length * @brief Get string length