ref: cb474632d3f23de10fea2d70a4b4c98d8f3a3755
dir: /sys/src/ape/lib/utf/runestrstr.c/
/*
* 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;
}