ref: e4b842056c1b63bafae9b5b1347366955b757730
dir: /sys/src/ape/lib/utf/utfutf.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
*/
char*
utfutf(char *s1, char *s2)
{
char *p;
long f, n1, n2;
Rune r;
n1 = chartorune(&r, s2);
f = r;
if(f <= Runesync) /* represents self */
return strstr(s1, s2);
n2 = strlen(s2);
for(p=s1; p=utfrune(p, f); p+=n1)
if(strncmp(p, s2, n2) == 0)
return p;
return 0;
}