diff options
Diffstat (limited to 'lib/string.c')
| -rw-r--r-- | lib/string.c | 51 |
1 files changed, 35 insertions, 16 deletions
diff --git a/lib/string.c b/lib/string.c index 0e0900de8bf..d56f88d4a84 100644 --- a/lib/string.c +++ b/lib/string.c @@ -15,13 +15,14 @@ * reentrant and should be faster). Use only strsep() in new code, please. */ +#include <asm/sections.h> #include <config.h> +#include <limits.h> #include <linux/compiler.h> -#include <linux/types.h> -#include <linux/string.h> #include <linux/ctype.h> +#include <linux/string.h> +#include <linux/types.h> #include <malloc.h> -#include <asm/sections.h> /** * strncasecmp - Case insensitive, length-limited string comparison @@ -679,30 +680,48 @@ char *memdup(const void *src, size_t len) return p; } -#ifndef __HAVE_ARCH_STRSTR +#ifndef __HAVE_ARCH_STRNSTR /** - * strstr - Find the first substring in a %NUL terminated string - * @s1: The string to be searched - * @s2: The string to search for + * strnstr() - find the first substring occurrence in a NUL terminated string + * + * @s1: string to be searched + * @s2: string to search for + * @len: maximum number of characters in s2 to consider + * + * Return: pointer to the first occurrence or NULL */ -char * strstr(const char * s1,const char * s2) +char *strnstr(const char *s1, const char *s2, size_t len) { - int l1, l2; + size_t l1, l2; + l1 = strnlen(s1, len); l2 = strlen(s2); - if (!l2) - return (char *) s1; - l1 = strlen(s1); - while (l1 >= l2) { - l1--; - if (!memcmp(s1,s2,l2)) + + for (; l1 >= l2; --l1, ++s1) { + if (!memcmp(s1, s2, l2)) return (char *) s1; - s1++; } + return NULL; } #endif +#ifndef __HAVE_ARCH_STRSTR +/** + * strstr() - find the first substring occurrence in a NUL terminated string + * + * @s1: string to be searched + * @s2: string to search for + * @len: maximum number of characters in s2 to consider + * + * Return: pointer to the first occurrence or NULL + */ +char *strstr(const char *s1, const char *s2) +{ + return strnstr(s1, s2, SIZE_MAX); +} +#endif + #ifndef __HAVE_ARCH_MEMCHR /** * memchr - Find a character in an area of memory. |