Function strstr

freebsd/libkern/strstr.c:44–61

* Find the first occurrence of find in s. */

 * Find the first occurrence of find in s.
 */
char *
strstr(const char *s, const char *find)
{
	char c, sc;
	size_t len;

	if ((c = *find++) != 0) {
		len = strlen(find);
		do {
			do {
				if ((sc = *s++) == '\0')
					return (NULL);
			} while (sc != c);
		} while (strncmp(s, find, len) != 0);
		s--;
	}
	return (__DECONST(char *, s));
}