debug/obprintf_chk.c

   1 /* Print output of stream to given obstack.
   2    Copyright (C) 1996-2023 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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <libio/libioP.h>
  20 #include <stdarg.h>
  21
  22
  23 int
  24 __obstack_printf_chk (struct obstack *obstack, int flag, const char *format,
  25                       ...)
  26 {
  27   /* For flag > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
  28      can only come from read-only format strings.  */
  29   unsigned int mode = (flag > 0) ? PRINTF_FORTIFY : 0;
  30   va_list ap;
  31   int ret;
  32
  33   va_start (ap, format);
  34   ret = __obstack_vprintf_internal (obstack, format, ap, mode);
  35   va_end (ap);
  36
  37   return ret;
  38 }