9base

revived minimalist port of Plan 9 userland to Unix
git clone git://git.suckless.org/9base
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runestrstr.c (1191B)


      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
     11  * ANY 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 "plan9.h"
     17 #include "utf.h"
     18 
     19 /*
     20  * Return pointer to first occurrence of s2 in s1,
     21  * 0 if none
     22  */
     23 Rune*
     24 runestrstr(Rune *s1, Rune *s2)
     25 {
     26 	Rune *p, *pa, *pb;
     27 	int c0, c;
     28 
     29 	c0 = *s2;
     30 	if(c0 == 0)
     31 		return s1;
     32 	s2++;
     33 	for(p=runestrchr(s1, c0); p; p=runestrchr(p+1, c0)) {
     34 		pa = p;
     35 		for(pb=s2;; pb++) {
     36 			c = *pb;
     37 			if(c == 0)
     38 				return p;
     39 			if(c != *++pa)
     40 				break;
     41 		}
     42 	}
     43 	return 0;
     44 }