string/strcpy.c

   1 /* Copyright (C) 1991-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stddef.h>
  19 #include <string.h>
  20
  21 #undef strcpy
  22
  23 /* Copy SRC to DEST.  */
  24 char *
  25 strcpy (char *dest, const char *src)
  26 {
  27   char c;
  28   char *s = (char *) src;
  29   const ptrdiff_t off = dest - s - 1;
  30
  31   do
  32     {
  33       c = *s++;
  34       s[off] = c;
  35     }
  36   while (c != '\0');
  37
  38   return dest;
  39 }
  40 libc_hidden_builtin_def (strcpy)