string/strcpy.c

   1 /* Copyright (C) 1991, 1997, 2000, 2003 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <stddef.h>
  20 #include <string.h>
  21 #include <memcopy.h>
  22 #include <bp-checks.h>
  23
  24 #undef strcpy
  25
  26 /* Copy SRC to DEST.  */
  27 char *
  28 strcpy (dest, src)
  29      char *dest;
  30      const char *src;
  31 {
  32   reg_char c;
  33   char *__unbounded s = (char *__unbounded) CHECK_BOUNDS_LOW (src);
  34   const ptrdiff_t off = CHECK_BOUNDS_LOW (dest) - s - 1;
  35   size_t n;
  36
  37   do
  38     {
  39       c = *s++;
  40       s[off] = c;
  41     }
  42   while (c != '\0');
  43
  44   n = s - src;
  45   (void) CHECK_BOUNDS_HIGH (src + n);
  46   (void) CHECK_BOUNDS_HIGH (dest + n);
  47
  48   return dest;
  49 }
  50 libc_hidden_builtin_def (strcpy)