/* * The authors of this software are Rob Pike and Ken Thompson. *              Copyright (c) 2002 by Lucent Technologies. * Permission to use, copy, modify, and distribute this software for any * purpose without fee is hereby granted, provided that this entire notice * is included in all copies of any software which is or includes a copy * or modification of this software and in all copies of the supporting * documentation for such software. * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE. */#include <stdarg.h>#include <string.h>#include "utf.h"#include "utfdef.h" /* * Return pointer to first occurrence of s2 in s1, * 0 if none */Rune*runestrstr(Rune *s1, Rune *s2){	Rune *p, *pa, *pb;	int c0, c; 	c0 = *s2;	if(c0 == 0)		return s1;	s2++;	for(p=runestrchr(s1, c0); p; p=runestrchr(p+1, c0)) {		pa = p;		for(pb=s2;; pb++) {			c = *pb;			if(c == 0)				return p;			if(c != *++pa)				break;		}	}	return 0;}