libelf/elf_getarhdr.c

/* Read header of next archive member.
   Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
   Written by Ulrich Drepper <drepper@redhat.com>, 1998.

   This program 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, version 2.

   This program 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, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <assert.h>
#include <libelf.h>
#include <stddef.h>

#include "libelfP.h"


Elf_Arhdr *
elf_getarhdr (elf)
     Elf *elf;
{
  Elf *parent = elf->parent;

  /* Calling this function is not ok for any file type but archives.  */
  if (parent == NULL)
    {
      __libelf_seterrno (ELF_E_INVALID_OP);
      return NULL;
    }

  /* Make sure we have read the archive header.  */
  if (parent->state.ar.elf_ar_hdr.ar_name == NULL
      && __libelf_next_arhdr (parent) != 0)
    /* Something went wrong.  Maybe there is no member left.  */
    return NULL;


  /* We can be sure the parent is an archive.  */
  assert (parent->kind == ELF_K_AR);

  return &parent->state.ar.elf_ar_hdr;
}