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      1 /*
      2  * The authors of this software are Rob Pike and Ken Thompson.
      3  *              Copyright (c) 2002 by Lucent Technologies.
      4  * Permission to use, copy, modify, and distribute this software for any
      5  * purpose without fee is hereby granted, provided that this entire notice
      6  * is included in all copies of any software which is or includes a copy
      7  * or modification of this software and in all copies of the supporting
      8  * documentation for such software.
      9  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
     10  * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
     11  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
     12  * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
     13  */
     14 #include <stdarg.h>
     15 #include <string.h>
     16 #include "utf.h"
     17 #include "utfdef.h"
     18 
     19 /*
     20  * Return pointer to first occurrence of s2 in s1,
     21  * 0 if none
     22  */
     23 const
     24 Rune*
     25 runestrstr(const Rune *s1, const Rune *s2)
     26 {
     27 	const Rune *p, *pa, *pb;
     28 	int c0, c;
     29 
     30 	c0 = *s2;
     31 	if(c0 == 0)
     32 		return s1;
     33 	s2++;
     34 	for(p=runestrchr(s1, c0); p; p=runestrchr(p+1, c0)) {
     35 		pa = p;
     36 		for(pb=s2;; pb++) {
     37 			c = *pb;
     38 			if(c == 0)
     39 				return p;
     40 			if(c != *++pa)
     41 				break;
     42 		}
     43 	}
     44 	return 0;
     45 }
     46