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 ANY
11 * 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 "utf.h"
17 #include "utfdef.h"
18
19
20 /*
21 * Return pointer to first occurrence of s2 in s1,
22 * 0 if none
23 */
24 const
25 char*
utfutf(const char * s1,const char * s2)26 utfutf(const char *s1, const char *s2)
27 {
28 const char *p;
29 long f, n1, n2;
30 Rune r;
31
32 n1 = chartorune(&r, s2);
33 f = r;
34 if(f <= Runesync) /* represents self */
35 return strstr(s1, s2);
36
37 n2 = strlen(s2);
38 for(p=s1; (p=utfrune(p, f)) != 0; p+=n1)
39 if(strncmp(p, s2, n2) == 0)
40 return p;
41 return 0;
42 }
43