debug/vfprintf_chk.c

   1 /* Copyright (C) 1991-2023 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <libio/libioP.h>
  19
  20
  21 /* Write formatted output to FP from the format string FORMAT.  */
  22 int
  23 ___vfprintf_chk (FILE *fp, int flag, const char *format, va_list ap)
  24 {
  25   /* For flag > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
  26      can only come from read-only format strings.  */
  27   unsigned int mode = (flag > 0) ? PRINTF_FORTIFY : 0;
  28
  29   return __vfprintf_internal (fp, format, ap, mode);
  30 }
  31 ldbl_strong_alias (___vfprintf_chk, __vfprintf_chk)