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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stddef.h>
  19 #include <string.h>
  20 #include <memcopy.h>
  21 #include <bp-checks.h>
  22
  23 #undef strcpy
  24
  25 /* Copy SRC to DEST.  */
  26 char *
  27 strcpy (dest, src)
  28      char *dest;
  29      const char *src;
  30 {
  31   char c;
  32   char *__unbounded s = (char *__unbounded) CHECK_BOUNDS_LOW (src);
  33   const ptrdiff_t off = CHECK_BOUNDS_LOW (dest) - s - 1;
  34   size_t n;
  35
  36   do
  37     {
  38       c = *s++;
  39       s[off] = c;
  40     }
  41   while (c != '\0');
  42
  43   n = s - src;
  44   (void) CHECK_BOUNDS_HIGH (src + n);
  45   (void) CHECK_BOUNDS_HIGH (dest + n);
  46
  47   return dest;
  48 }
  49 libc_hidden_builtin_def (strcpy)