lib/unistr/u-move.h

   1 /* Copy piece of UTF-8/UTF-16/UTF-32 string.
   2    Copyright (C) 1999, 2002, 2006, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <string.h>
  19
  20 UNIT *
  21 FUNC (UNIT *dest, const UNIT *src, size_t n)
  22 {
  23 #if 0
  24   if (dest < src)
  25     {
  26       UNIT *destptr = dest;
  27       const UNIT *srcptr = src;
  28
  29       for (; n > 0; n--)
  30         *destptr++ = *srcptr++;
  31     }
  32   else if (dest > src)
  33     {
  34       UNIT *destptr = dest + n - 1;
  35       const UNIT *srcptr = src + n - 1;
  36
  37       for (; n > 0; n--)
  38         *destptr-- = *srcptr--;
  39     }
  40 #else
  41   memmove ((char *) dest, (const char *) src, n * sizeof (UNIT));
  42 #endif
  43   return dest;
  44 }