lib/wmemmove-impl.h

   1 /* Copy wide character array.
   2    Copyright (C) 1999, 2011-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 1999.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 wchar_t *
  19 wmemmove (wchar_t *dest, const wchar_t *src, size_t n)
  20 {
  21   if (dest < src)
  22     {
  23       wchar_t *destptr = dest;
  24       const wchar_t *srcptr = src;
  25       for (; n > 0; n--)
  26         *destptr++ = *srcptr++;
  27     }
  28   else if (dest > src)
  29     {
  30       wchar_t *destptr = dest + n - 1;
  31       const wchar_t *srcptr = src + n - 1;
  32       for (; n > 0; n--)
  33         *destptr-- = *srcptr--;
  34     }
  35   return dest;
  36 }