/* Test program for reading and writing out the same file in-place

   Copyright (C) 2019 Red Hat, Inc.

   This file is part of elfutils.

   This file is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   elfutils 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 General Public License for more details.

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

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <errno.h>

#include <fcntl.h>

#include <inttypes.h>

#include <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include ELFUTILS_HEADER(elf)

#include <gelf.h>

int

main (int argc, const char *argv[])

{

  /* Takes the given file, and create a new identical one.  */

  if (argc != 2)

    {

      fprintf (stderr, "elfrdwrnop elf-file\n");

      exit (1);

    }

  elf_version (EV_CURRENT);

  const char *name = argv[1];

  printf ("elfrdwrdnop %s\n", name);

  int fd = open (name, O_RDWR);

  if (fd < 0)

    {

      fprintf (stderr, "Couldn't open file '%s': %s\n",

	       name, strerror (errno));

      exit (1);

    }

  Elf *elf = elf_begin (fd, ELF_C_RDWR, NULL);

  if (elf == NULL)

    {

      fprintf (stderr, "Couldn't open ELF file '%s': %s\n",

	       name, elf_errmsg (-1));

      exit (1);

    }

  /* Write everything to disk.  If there are any phdrs, then we want

     the exact same layout.  */

  size_t phnum;

  if (elf_getphdrnum (elf, &phnum) != 0)

    {

      printf ("cannot get phdrs: %s\n", elf_errmsg (-1));

      exit (1);

    }

  if (phnum > 0)

    elf_flagelf (elf, ELF_C_SET, ELF_F_LAYOUT);

  if (elf_update (elf, ELF_C_WRITE) < 0)

    {

      printf ("failure in elf_update: %s\n", elf_errmsg (-1));

      exit (1);

    }

  if (elf_end (elf) != 0)

    {

      printf ("couldn't cleanup elf '%s': %s\n", name, elf_errmsg (-1));

      exit (1);

    }

  if (close (fd) != 0)

    {

      printf ("couldn't close '%s': %s\n", name, strerror (errno));

      exit (1);

    }

  return 0;

}