wcsmbs/wcscpy.c

   1 /* Copyright (C) 1995, 1996, 1997, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stddef.h>
  20 #include <wchar.h>
  21
  22
  23 /* Copy SRC to DEST.  */
  24 wchar_t *
  25 wcscpy (dest, src)
  26      wchar_t *dest;
  27      const wchar_t *src;
  28 {
  29   wint_t c;
  30   wchar_t *wcp;
  31
  32   if (__alignof__ (wchar_t) >= sizeof (wchar_t))
  33     {
  34       const ptrdiff_t off = dest - src - 1;
  35
  36       wcp = (wchar_t *) src;
  37
  38       do
  39         {
  40           c = *wcp++;
  41           wcp[off] = c;
  42         }
  43       while (c != L'\0');
  44     }
  45   else
  46     {
  47       wcp = dest;
  48
  49       do
  50         {
  51           c = *src++;
  52           *wcp++ = c;
  53         }
  54       while (c != L'\0');
  55     }
  56
  57   return dest;
  58 }