debug/printf_chk.c

   1 /* Copyright (C) 1991-2015 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 <stdarg.h>
  19 #include <stdio.h>
  20 #include "../libio/libioP.h"
  21
  22
  23 /* Write formatted output to stdout from the format string FORMAT.  */
  24 int
  25 ___printf_chk (int flag, const char *format, ...)
  26 {
  27   va_list ap;
  28   int done;
  29
  30   _IO_acquire_lock_clear_flags2 (stdout);
  31   if (flag > 0)
  32     stdout->_flags2 |= _IO_FLAGS2_FORTIFY;
  33
  34   va_start (ap, format);
  35   done = vfprintf (stdout, format, ap);
  36   va_end (ap);
  37
  38   if (flag > 0)
  39     stdout->_flags2 &= ~_IO_FLAGS2_FORTIFY;
  40   _IO_release_lock (stdout);
  41
  42   return done;
  43 }
  44 ldbl_strong_alias (___printf_chk, __printf_chk)