debug/vfprintf_chk.c

   1 /* Copyright (C) 1991-2017 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 FP from the format string FORMAT.  */
  24 int
  25 ___vfprintf_chk (FILE *fp, int flag, const char *format, va_list ap)
  26 {
  27   int done;
  28
  29   _IO_acquire_lock_clear_flags2 (fp);
  30   if (flag > 0)
  31     fp->_flags2 |= _IO_FLAGS2_FORTIFY;
  32
  33   done = vfprintf (fp, format, ap);
  34
  35   if (flag > 0)
  36     fp->_flags2 &= ~_IO_FLAGS2_FORTIFY;
  37   _IO_release_lock (fp);
  38
  39   return done;
  40 }
  41 ldbl_hidden_def (___vfprintf_chk, __vfprintf_chk)
  42 ldbl_strong_alias (___vfprintf_chk, __vfprintf_chk)