/* Test program for dwelf_elf_gnu_build_id, print build ID.

   Copyright (C) 2014 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/>.  */

#include <config.h>

#include <assert.h>

#include <inttypes.h>

#include <err.h>

#include <errno.h>

#include ELFUTILS_HEADER(elf)

#include ELFUTILS_HEADER(dwelf)

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include "system.h"

int

main (int argc, char *argv[])

{

  if (argc < 2)

    error (EXIT_FAILURE, 0, "No input file given");

  elf_version (EV_CURRENT);

  for (int i = 1; i < argc; i++)

    {

      const char *file = argv[i];

      int fd = open (file, O_RDONLY);

      if (fd < 0)

	error (EXIT_FAILURE, errno, "couldn't open file '%s'", file);

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

      if (elf == NULL)

	{

	  printf("%s: elf_begin failed: %s\n", file, elf_errmsg (-1));

	  close (fd);

	  continue;

	}

      const void *build_id;

      ssize_t len = dwelf_elf_gnu_build_id (elf, &build_id);

      switch (len)

	{

	case 0:

	  printf ("%s: <no NT_GNU_BUILD_ID note>\n", file);

	  break;

	case -1:

	  errx (1, "dwelf_elf_gnu_build_id (%s): %s",

		file, elf_errmsg (-1));

	default:

	  printf ("%s: build ID: ", file);

	  const unsigned char *p = build_id;

	  const unsigned char *end = p + len;

	  while (p < end)

	      printf("%02x", (unsigned)*p++);

	  putchar('\n');

	}

      elf_end (elf);

      close (fd);

    }

  return 0;

}