debug/stpcpy_chk.c

   1 /* Copyright (C) 1992-2014 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 #ifdef HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <string.h>
  23
  24
  25 /* Copy SRC to DEST, returning the address of the terminating '\0' in DEST.  */
  26 char *
  27 __stpcpy_chk (dest, src, destlen)
  28      char *dest;
  29      const char *src;
  30      size_t destlen;
  31 {
  32   char *d = dest;
  33   const char *s = src;
  34
  35   do
  36     {
  37       if (__builtin_expect (destlen-- == 0, 0))
  38         __chk_fail ();
  39       *d++ = *s;
  40     }
  41   while (*s++ != '\0');
  42
  43   return d - 1;
  44 }