ref: 351881313c73f9276a102d1508ca59e3cc8ad7b1
dir: /lib/c/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;
}