MEMMEM - obtain first substring from string.

(Not in the ANSI standard)

#include <sdgstd.h>
ptr = memmem( s, subs, size_s, size_subs);

const void *s;: points to the string to be scanned.
const void *subs;: points to the (sub)string to scan for.
size_t size_s;: is the length of "s".
size_t size_subs;: is the length of "subs".
void *ptr;: points to the first occurrence of the substring in the given string. If the substring is not found, this will be a null pointer.

"memmem" returns a pointer to the first occurrence of a substring within another string.