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  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 *__restrict <[s1]>,
  8.                         const wchar_t *__restrict <[s2]>, size_t <[n]>);
  9.  
  10. TRAD_SYNOPSIS
  11.         wchar_t *wcsncat(<[s1]>, <[s2]>, <[n]>
  12.         wchar_t *__restrict <[s1]>;
  13.         const wchar_t *__restrict <[s2]>;
  14.         size_t <[n]>;
  15.  
  16. DESCRIPTION
  17.         The <<wcsncat>> function appends not more than <[n]> wide-character
  18.         codes (a null wide-character code and wide-character codes that follow
  19.         it are not appended) from the array pointed to by <[s2]> to the end of
  20.         the wide-character string pointed to by <[s1]>. The initial
  21.         wide-character code of <[s2]> overwrites the null wide-character code
  22.         at the end of <[s1]>.
  23.         A terminating null wide-character code is always appended to the result.
  24.         If copying takes place between objects that overlap, the behaviour is
  25.         undefined.
  26.  
  27. RETURNS
  28.         The <<wcsncat>> function returns <[s1]>; no return value is reserved to
  29.         indicate an error.
  30.  
  31. PORTABILITY
  32. <<wcsncat>> is ISO/IEC 9899/AMD1:1995 (ISO C).
  33.  
  34. No supporting OS subroutines are required.
  35. */
  36.  
  37. /*      $NetBSD: wcsncat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $       */
  38.  
  39. /*-
  40.  * Copyright (c)1999 Citrus Project,
  41.  * All rights reserved.
  42.  *
  43.  * Redistribution and use in source and binary forms, with or without
  44.  * modification, are permitted provided that the following conditions
  45.  * are met:
  46.  * 1. Redistributions of source code must retain the above copyright
  47.  *    notice, this list of conditions and the following disclaimer.
  48.  * 2. Redistributions in binary form must reproduce the above copyright
  49.  *    notice, this list of conditions and the following disclaimer in the
  50.  *    documentation and/or other materials provided with the distribution.
  51.  *
  52.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  53.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  56.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62.  * SUCH DAMAGE.
  63.  *
  64.  *      citrus Id: wcsncat.c,v 1.1 1999/12/29 21:47:45 tshiozak Exp
  65.  */
  66.  
  67. #include <_ansi.h>
  68. #include <wchar.h>
  69.  
  70. wchar_t *
  71. _DEFUN (wcsncat, (s1, s2, n),
  72.         wchar_t *__restrict s1 _AND
  73.         _CONST wchar_t *__restrict s2 _AND
  74.         size_t n)
  75. {
  76.   wchar_t *p;
  77.   wchar_t *q;
  78.   _CONST wchar_t *r;
  79.  
  80.   p = s1;
  81.   while (*p)
  82.     p++;
  83.   q = p;
  84.   r = s2;
  85.   while (*r && n)
  86.     {
  87.       *q++ = *r++;
  88.       n--;
  89.     }
  90.   *q = '\0';
  91.   return s1;
  92. }
  93.