1 /*
2 FUNCTION
3 <<wcsrchr>>---wide-character string scanning operation
4
5 SYNOPSIS
6 #include <wchar.h>
7 wchar_t *wcsrchr(const wchar_t *<[s]>, wchar_t <[c]>);
8
9 DESCRIPTION
10 The <<wcsrchr>> function locates the last occurrence of <[c]> in the
11 wide-character string pointed to by <[s]>. The value of <[c]> must be a
12 character representable as a type wchar_t and must be a wide-character
13 code corresponding to a valid character in the current locale.
14 The terminating null wide-character code is considered to be part of
15 the wide-character string.
16
17 RETURNS
18 Upon successful completion, <<wcsrchr>> returns a pointer to the
19 wide-character code or a null pointer if <[c]> does not occur in the
20 wide-character string.
21
22 PORTABILITY
23 <<wcsrchr>> is ISO/IEC 9899/AMD1:1995 (ISO C).
24
25 No supporting OS subroutines are required.
26 */
27
28 /* $NetBSD: wcsrchr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $ */
29
30 /*-
31 * Copyright (c)1999 Citrus Project,
32 * All rights reserved.
33 *
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
36 * are met:
37 * 1. Redistributions of source code must retain the above copyright
38 * notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 * notice, this list of conditions and the following disclaimer in the
41 * documentation and/or other materials provided with the distribution.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 *
55 * citrus Id: wcsrchr.c,v 1.2 2000/12/21 05:07:25 itojun Exp
56 */
57
58 #include <_ansi.h>
59 #include <stddef.h>
60 #include <wchar.h>
61
62 wchar_t *
wcsrchr(const wchar_t * s,wchar_t c)63 wcsrchr (const wchar_t * s,
64 wchar_t c)
65 {
66 const wchar_t *p;
67
68 p = s;
69 while (*p)
70 p++;
71 while (s <= p)
72 {
73 if (*p == c)
74 {
75 /* LINTED interface specification */
76 return (wchar_t *) p;
77 }
78 p--;
79 }
80 return NULL;
81 }
82
