newlib-cygwin/newlib/libc/string/wcscat.c

/*
FUNCTION
	<<wcscat>>---concatenate two wide-character strings
INDEX
	wcscat

ANSI_SYNOPSIS
	#include <wchar.h>
	wchar_t *wcscat(wchar_t *<[s1]>, const wchar_t *<[s2]>);

TRAD_SYNOPSIS
	wchar_t *wcscat(<[s1]>, <[s2]>
	wchar_t *<[s1]>;
	const wchar_t *<[s2]>;

DESCRIPTION
	The <<wcscat>> function appends a copy of the wide-character string
	pointed to by <[s2]> (including the terminating null wide-character
	code) to the end of the wide-character string pointed to by <[s1]>.
	The initial wide-character code of <[s2]> overwrites the null
	wide-character code at the end of <[s1]>. If copying takes place between
	objects that overlap, the behaviour is undefined. 

RETURNS
	The <<wcscat>> function returns <[s1]>;
	no return value is reserved to indicate an error. 

PORTABILITY
<<wcscat>> is ISO/IEC 9899/AMD1:1995 (ISO C).
No supporting OS subroutines are required.
*/

/*	$NetBSD: wcscat.c,v 1.1 2000/12/23 23:14:36 itojun Exp $	*/

/*-
 * Copyright (c)1999 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	citrus Id: wcscat.c,v 1.1 1999/12/29 21:47:45 tshiozak Exp
 */

#include <_ansi.h>
#include <wchar.h>

wchar_t *
_DEFUN (wcscat, (s1, s2),
	wchar_t * s1 _AND
	_CONST wchar_t * s2)
{
  wchar_t *p;
  wchar_t *q;
  _CONST wchar_t *r;

  p = s1;
  while (*p)
    p++;
  q = p;
  r = s2;
  while (*r)
    *q++ = *r++;
  *q = '\0';
  return s1;
}