wcsmbs/wcscpy.c

   1 /* Copyright (C) 1995-2017 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 #ifndef WCSCPY
  24 # define WCSCPY wcscpy
  25 #endif
  26
  27 /* Copy SRC to DEST.  */
  28 wchar_t *
  29 WCSCPY (wchar_t *dest, const wchar_t *src)
  30 {
  31   wint_t c;
  32   wchar_t *wcp;
  33
  34   if (__alignof__ (wchar_t) >= sizeof (wchar_t))
  35     {
  36       const ptrdiff_t off = dest - src - 1;
  37
  38       wcp = (wchar_t *) src;
  39
  40       do
  41         {
  42           c = *wcp++;
  43           wcp[off] = c;
  44         }
  45       while (c != L'\0');
  46     }
  47   else
  48     {
  49       wcp = dest;
  50
  51       do
  52         {
  53           c = *src++;
  54           *wcp++ = c;
  55         }
  56       while (c != L'\0');
  57     }
  58
  59   return dest;
  60 }