1 /* $NetBSD: wcsstr.c,v 1.5 2012/06/25 22:32:46 abs Exp $ */
2
3 /*-
4 * Copyright (c)1999 Citrus Project,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * citrus Id: wcsstr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
29 */
30
31 #include <sys/cdefs.h>
32 #if defined(LIBC_SCCS) && !defined(lint)
33 __RCSID("$NetBSD: wcsstr.c,v 1.5 2012/06/25 22:32:46 abs Exp $");
34 #endif /* LIBC_SCCS and not lint */
35
36 #include <assert.h>
37 #include <wchar.h>
38
39 wchar_t *
40 #ifdef WCSWCS
wcswcs(const wchar_t * big,const wchar_t * little)41 wcswcs(const wchar_t *big, const wchar_t *little)
42 #else
43 wcsstr(const wchar_t *big, const wchar_t *little)
44 #endif
45 {
46 const wchar_t *p;
47 const wchar_t *q;
48 const wchar_t *r;
49
50 _DIAGASSERT(big != NULL);
51 _DIAGASSERT(little != NULL);
52
53 if (!*little)
54 return __UNCONST(big);
55 if (wcslen(big) < wcslen(little))
56 return NULL;
57
58 p = big;
59 q = little;
60 while (*p) {
61 q = little;
62 r = p;
63 while (*q) {
64 if (*r != *q)
65 break;
66 q++;
67 r++;
68 }
69 if (!*q)
70 return __UNCONST(p);
71 p++;
72 }
73 return NULL;
74 }
75