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libiberty/strstr.c
35 строк
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Import source from binutils
18 сен 2022, 18:55
18 сен 2022, 18:55
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/* Simple implementation of strstr for systems without it. This function is in the public domain. */ /* @deftypefn Supplemental char* strstr (const char *@var{string}, const char *@var{sub}) This function searches for the substring @var{sub} in the string @var{string}, not including the terminating null characters. A pointer to the first occurrence of @var{sub} is returned, or @code{NULL} if the substring is absent. If @var{sub} points to a string with zero length, the function returns @var{string}. @end deftypefn */ #include <stddef.h> extern int memcmp (const void *, const void *, size_t); extern size_t strlen (const char *); char * strstr (const char *s1, const char *s2) { const size_t len = strlen (s2); while (*s1) { if (!memcmp (s1, s2, len)) return (char *)s1; ++s1; } return (0); }