Function strstr

payloads/libpayload/libc/string.c:267–280

* Find a substring within a string. * * @param h The haystack string. * @param n The needle string (substring). * @return A pointer to the first occurrence of the substring in * the string, or NULL if the substring was not encountered within the string. */

 * the string, or NULL if the substring was not encountered within the string.
 */
char *strstr(const char *h, const char *n)
{
	size_t hn = strlen(h);
	size_t nn = strlen(n);

	if (hn < nn)
		return NULL;

	for (size_t i = 0; i <= hn - nn; i++)
		if (!memcmp(&h[i], n, nn))
			return (char *)&h[i];

	return NULL;
}

/**
 * Separate strings.