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 /*
21  * Return pointer to first occurrence of s2 in s1,
22  * 0 if none
23  */
24 char*
25 utfutf(char *s1, char *s2)
26 {
27 	char *p;
28 	long f, n1, n2;
29 	Rune r;
30 
31 	n1 = chartorune(&r, s2);
32 	f = r;
33 	if(f <= Runesync)		/* represents self */
34 		return strstr(s1, s2);
35 
36 	n2 = strlen(s2);
37 	for(p=s1; p=utfrune(p, f); p+=n1)
38 		if(strncmp(p, s2, n2) == 0)
39 			return p;
40 	return 0;
41 }