1 /*
2 FUNCTION
3 <<wcsncat>>---concatenate part of two wide-character strings
4
5 SYNOPSIS
6 #include <wchar.h>
7 wchar_t *wcsncat(wchar_t *__restrict <[s1]>,
8 const wchar_t *__restrict <[s2]>, size_t <[n]>);
9
10 DESCRIPTION
11 The <<wcsncat>> function appends not more than <[n]> wide-character
12 codes (a null wide-character code and wide-character codes that follow
13 it are not appended) from the array pointed to by <[s2]> to the end of
14 the wide-character string pointed to by <[s1]>. The initial
15 wide-character code of <[s2]> overwrites the null wide-character code
16 at the end of <[s1]>.
17 A terminating null wide-character code is always appended to the result.
18 If copying takes place between objects that overlap, the behaviour is
19 undefined.
20
21 RETURNS
22 The <<wcsncat>> function returns <[s1]>; no return value is reserved to
23 indicate an error.
24
25 PORTABILITY
26 <<wcsncat>> is ISO/IEC 9899/AMD1:1995 (ISO C).
27
28 No supporting OS subroutines are required.
29 */
30
31 /* $NetBSD: wcsncat.c,v 1.1 2000/12/23 23:14:36 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: wcsncat.c,v 1.1 1999/12/29 21:47:45 tshiozak Exp
59 */
60
61 #include <_ansi.h>
62 #include <wchar.h>
63
64 wchar_t *
wcsncat(wchar_t * __restrict s1,const wchar_t * __restrict s2,size_t n)65 wcsncat (wchar_t *__restrict s1,
66 const wchar_t *__restrict s2,
67 size_t n)
68 {
69 wchar_t *p;
70 wchar_t *q;
71 const wchar_t *r;
72
73 p = s1;
74 while (*p)
75 p++;
76 q = p;
77 r = s2;
78 while (*r && n)
79 {
80 *q++ = *r++;
81 n--;
82 }
83 *q = '\0';
84 return s1;
85 }
86
