debug/printf_chk.c

   1 /* Copyright (C) 1991, 1995, 1996, 1997, 2001, 2004
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <stdarg.h>
  21 #include <stdio.h>
  22 #include "../libio/libioP.h"
  23
  24
  25 /* Write formatted output to stdout from the format string FORMAT.  */
  26 int
  27 __printf_chk (int flag, const char *format, ...)
  28 {
  29   va_list ap;
  30   int done;
  31
  32   _IO_acquire_lock (stdout);
  33   if (flag > 0)
  34     stdout->_flags2 |= _IO_FLAGS2_FORTIFY;
  35
  36   va_start (ap, format);
  37   done = vfprintf (stdout, format, ap);
  38   va_end (ap);
  39
  40   if (flag > 0)
  41     stdout->_flags2 &= ~_IO_FLAGS2_FORTIFY;
  42   _IO_release_lock (stdout);
  43
  44   return done;
  45 }