1 /*
2 FUNCTION
3 <<wmemchr>>---find a wide character in memory
4
5
6 SYNOPSIS
7 #include <wchar.h>
8 wchar_t *wmemchr(const wchar_t *<[s]>, wchar_t <[c]>, size_t <[n]>);
9
10 DESCRIPTION
11 The <<wmemchr>> function locates the first occurrence of <[c]> in the
12 initial <[n]> wide characters of the object pointed to be <[s]>. This
13 function is not affected by locale and all wchar_t values are treated
14 identically. The null wide character and wchar_t values not
15 corresponding to valid characters are not treated specially.
16
17 If <[n]> is zero, <[s]> must be a valid pointer and the function
18 behaves as if no valid occurrence of <[c]> is found.
19
20 RETURNS
21 The <<wmemchr>> function returns a pointer to the located
22 wide character, or a null pointer if the wide character does not occur
23 in the object.
24
25 PORTABILITY
26 <<wmemchr>> is ISO/IEC 9899/AMD1:1995 (ISO C).
27
28 No supporting OS subroutines are required.
29 */
30
31 /* $NetBSD: wmemchr.c,v 1.1 2000/12/23 23:14:37 itojun Exp $ */
32
33 /*-
34 * Copyright (c)1999 Citrus Project,
35 * All rights reserved.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 *
46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56 * SUCH DAMAGE.
57 *
58 * citrus Id: wmemchr.c,v 1.2 2000/12/20 14:08:31 itojun Exp
59 */
60
61
62 #include <_ansi.h>
63 #include <wchar.h>
64
65 wchar_t *
wmemchr(const wchar_t * s,wchar_t c,size_t n)66 wmemchr (const wchar_t * s,
67 wchar_t c,
68 size_t n)
69 {
70 size_t i;
71
72 for (i = 0; i < n; i++)
73 {
74 if (*s == c)
75 {
76 /* LINTED const castaway */
77 return (wchar_t *) s;
78 }
79 s++;
80 }
81 return NULL;
82 }
83
