char *strstr( char *haystack, char *needle ) {
	char *hp;
	char *np;

	if( !*needle ) return haystack;              // null needle; return haystack (strange POSIX specification requirement!)

	while( *haystack ) {                         // until we reach the end of the haystack
		hp = haystack;                           // copy of the haystack pointer      
		np = needle;                             // copy of the needle pointer
		do {
			if( !*np ) return haystack;          // end of needle; match completed; return current value of haystack pointer
		} while( *hp++ == *np++ );               // increment both pointer (copies) while the chars match
		++haystack;                              // Got here means a mismatch; base pointer to next character.
	}
	return 0;                                    // Got here means we hit the terminating null of the haystack; no match; return null.
}