debug/stpcpy_chk.c

   1 /* Copyright (C) 1992, 1995, 1997, 2002, 2004 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 #ifdef HAVE_CONFIG_H
  20 # include <config.h>
  21 #endif
  22
  23 #include <string.h>
  24
  25
  26 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
  27 char *
  28 __stpcpy_chk (dest, src, destlen)
  29      char *dest;
  30      const char *src;
  31      size_t destlen;
  32 {
  33   register char *d = dest;
  34   register const char *s = src;
  35
  36   do
  37     {
  38       if (__builtin_expect (destlen-- == 0, 0))
  39         __chk_fail ();
  40       *d++ = *s;
  41     }
  42   while (*s++ != '\0');
  43
  44   return d - 1;
  45 }