ref: f2e04e5f2f85f9dda6d813a9a47a95995de1e5aa
dir: /src/libc/string/strstr.c/
#include <stddef.h>
#include <string.h>
#undef strstr
char *
strstr(const char *s1, const char *s2)
{
const char *p;
int c = *s2;
if (c == '\0')
return NULL;
for (p = s1; p = strchr(p, c); ++p) {
if (!strcmp(p, s2))
return (char *) p;
}
return NULL;
}