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 #include <memcopy.h>
  21
  22 #undef strcpy
  23
  24 /* Copy SRC to DEST.  */
  25 char *
  26 strcpy (dest, src)
  27      char *dest;
  28      const char *src;
  29 {
  30   char c;
  31   char *s = (char *) src;
  32   const ptrdiff_t off = dest - s - 1;
  33
  34   do
  35     {
  36       c = *s++;
  37       s[off] = c;
  38     }
  39   while (c != '\0');
  40
  41   return dest;
  42 }
  43 libc_hidden_builtin_def (strcpy)