runestrchr.c revision 439f3d1f87279a8be383ee01ef98cb9a5ca68573 
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
19Rune*
20runestrchr(Rune *s, Rune c)
21{
22	Rune c0 = c;
23	Rune c1;
24
25	if(c == 0) {
26		while(*s++)
27			;
28		return s-1;
29	}
30
31	while(c1 = *s++)
32		if(c1 == c0)
33			return s-1;
34	return 0;
35}
36