lib/libc/string/wcsncat.c

   1 /*      $NetBSD: wcsncat.c,v 1.3 2012/06/25 22:32:46 abs Exp $  */
   2
   3 /*-
   4  * Copyright (c)1999 Citrus Project,
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  *      citrus Id: wcsncat.c,v 1.1 1999/12/29 21:47:45 tshiozak Exp
  29  */
  30
  31 #include <sys/cdefs.h>
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 __RCSID("$NetBSD: wcsncat.c,v 1.3 2012/06/25 22:32:46 abs Exp $");
  34 #endif /* LIBC_SCCS and not lint */
  35
  36 #include <assert.h>
  37 #include <wchar.h>
  38
  39 wchar_t *
  40 wcsncat(wchar_t *s1, const wchar_t *s2, size_t n)
  41 {
  42         wchar_t *p;
  43         wchar_t *q;
  44         const wchar_t *r;
  45
  46         _DIAGASSERT(s1 != NULL);
  47         _DIAGASSERT(s2 != NULL);
  48
  49         p = s1;
  50         while (*p)
  51                 p++;
  52         q = p;
  53         r = s2;
  54         while (*r && n) {
  55                 *q++ = *r++;
  56                 n--;
  57         }
  58         *q = '\0';
  59         return s1;
  60 }