toolchain/gcc/newlib/libc/string/wcsncat.c

   1 /*
   2 FUNCTION
   3         <<wcsncat>>---concatenate part of two wide-character strings
   4
   5 ANSI_SYNOPSIS
   6         #include <wchar.h>
   7         wchar_t *wcsncat(wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);
   8
   9 TRAD_SYNOPSIS
  10         wchar_t *wcsncat(<[s1]>, <[s2]>, <[n]>
  11         wchar_t *<[s1]>;
  12         const wchar_t *<[s2]>;
  13         size_t <[n]>;
  14
  15 DESCRIPTION
  16         The <<wcsncat>> function appends not more than <[n]> wide-character
  17         codes (a null wide-character code and wide-character codes that follow
  18         it are not appended) from the array pointed to by <[s2]> to the end of
  19         the wide-character string pointed to by <[s1]>. The initial
  20         wide-character code of <[s2]> overwrites the null wide-character code
  21         at the end of <[s1]>.
  22         A terminating null wide-character code is always appended to the result.
  23         If copying takes place between objects that overlap, the behaviour is
  24         undefined.
  25
  26 RETURNS
  27         The <<wcsncat>> function returns <[s1]>; no return value is reserved to
  28         indicate an error.
  29
  30 PORTABILITY
  31 <<wcsncat>> is ISO/IEC 9899/AMD1:1995 (ISO C).
  32 No supporting OS subroutines are required.
  33 */
  34
  35 /*      $NetBSD: wcsncat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $       */
  36
  37 /*-
  38  * Copyright (c)1999 Citrus Project,
  39  * All rights reserved.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      citrus Id: wcsncat.c,v 1.1 1999/12/29 21:47:45 tshiozak Exp
  63  */
  64
  65 #include <_ansi.h>
  66 #include <wchar.h>
  67
  68 wchar_t *
  69 _DEFUN (wcsncat, (s1, s2, n),
  70         wchar_t * s1 _AND
  71         _CONST wchar_t * s2 _AND
  72         size_t n)
  73 {
  74   wchar_t *p;
  75   wchar_t *q;
  76   _CONST wchar_t *r;
  77
  78   p = s1;
  79   while (*p)
  80     p++;
  81   q = p;
  82   r = s2;
  83   while (*r && n)
  84     {
  85       *q++ = *r++;
  86       n--;
  87     }
  88   *q = '\0';
  89   return s1;
  90 }