wcsmbs/wcpcpy.c

   1 /* Copyright (C) 1996-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
   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 <wchar.h>
  20
  21 #define __need_ptrdiff_t
  22 #include <stddef.h>
  23
  24 #ifdef WCPCPY
  25 # define __wcpcpy WCPCPY
  26 #endif
  27 /* Copy SRC to DEST, returning the address of the terminating L'\0' in
  28    DEST.  */
  29 wchar_t *
  30 __wcpcpy (wchar_t *dest, const wchar_t *src)
  31 {
  32   wchar_t *wcp = (wchar_t *) dest - 1;
  33   wint_t c;
  34   const ptrdiff_t off = src - dest + 1;
  35
  36   do
  37     {
  38       c = wcp[off];
  39       *++wcp = c;
  40     }
  41   while (c != L'\0');
  42
  43   return wcp;
  44 }
  45
  46 #ifndef WCPCPY
  47 weak_alias (__wcpcpy, wcpcpy)
  48 #endif