/* Print output of stream to given obstack.

   Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <stdlib.h>

#include <libioP.h>

#include "../libio/strfile.h"

#include <assert.h>

#include <string.h>

#include <errno.h>

#include <obstack.h>

#include <stdarg.h>

#include <stdio_ext.h>

struct _IO_obstack_file

{

  struct _IO_FILE_plus file;

  struct obstack *obstack;

};

extern const struct _IO_jump_t _IO_obstack_jumps libio_vtable attribute_hidden;

int

__obstack_vprintf_chk (struct obstack *obstack, int flags, const char *format,

		       va_list args)

{

  struct obstack_FILE

    {

      struct _IO_obstack_file ofile;

    } new_f;

  int result;

  int size;

  int room;

#ifdef _IO_MTSAFE_IO

  new_f.ofile.file.file._lock = NULL;

#endif

  _IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL);

  _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;

  room = obstack_room (obstack);

  size = obstack_object_size (obstack) + room;

  if (size == 0)

    {

      /* We have to handle the allocation a bit different since the

	 `_IO_str_init_static' function would handle a size of zero

	 different from what we expect.  */

      /* Get more memory.  */

      obstack_make_room (obstack, 64);

      /* Recompute how much room we have.  */

      room = obstack_room (obstack);

      size = room;

      assert (size != 0);

    }

  _IO_str_init_static_internal ((struct _IO_strfile_ *) &new_f.ofile,

				obstack_base (obstack),

				size, obstack_next_free (obstack));

  /* Now allocate the rest of the current chunk.  */

  assert (size == (new_f.ofile.file.file._IO_write_end

		   - new_f.ofile.file.file._IO_write_base));

  assert (new_f.ofile.file.file._IO_write_ptr

	  == (new_f.ofile.file.file._IO_write_base

	      + obstack_object_size (obstack)));

  obstack_blank_fast (obstack, room);

  new_f.ofile.obstack = obstack;

  /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n

     can only come from read-only format strings.  */

  if (flags > 0)

    new_f.ofile.file.file._flags2 |= _IO_FLAGS2_FORTIFY;

  result = _IO_vfprintf (&new_f.ofile.file.file, format, args);

  /* Shrink the buffer to the space we really currently need.  */

  obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr

				- new_f.ofile.file.file._IO_write_end));

  return result;

}

libc_hidden_def (__obstack_vprintf_chk)

int

__obstack_printf_chk (struct obstack *obstack, int flags, const char *format,

		      ...)

{

  int result;

  va_list ap;

  va_start (ap, format);

  result = __obstack_vprintf_chk (obstack, flags, format, ap);

  va_end (ap);

  return result;

}