libelf/gelf_getverdaux.c

/* Get additional symbol version definition information at the given offset.
   Copyright (C) 1999, 2000, 2001, 2002 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Written by Ulrich Drepper <drepper@redhat.com>, 1999.

   Red Hat elfutils 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 of the License.

   Red Hat 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 Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

   In addition, as a special exception, Red Hat, Inc. gives You the
   additional right to link the code of Red Hat elfutils with code licensed
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   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <assert.h>
#include <gelf.h>
#include <string.h>

#include "libelfP.h"


GElf_Verdaux *
gelf_getverdaux (data, offset, dst)
     Elf_Data *data;
     int offset;
     GElf_Verdaux *dst;
{
  GElf_Verdaux *result;

  if (data == NULL)
    return NULL;

  if (unlikely (data->d_type != ELF_T_VDEF))
    {
      __libelf_seterrno (ELF_E_INVALID_HANDLE);
      return NULL;
    }

  /* It's easy to handle this type.  It has the same size for 32 and
     64 bit objects.  */
  assert (sizeof (GElf_Verdaux) == sizeof (Elf32_Verdaux));
  assert (sizeof (GElf_Verdaux) == sizeof (Elf64_Verdaux));

  rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock);

  /* The data is already in the correct form.  Just make sure the
     index is OK.  */
  if (unlikely (offset < 0)
      || unlikely (offset + sizeof (GElf_Verdaux) > data->d_size)
      || unlikely (offset % __alignof__ (GElf_Verdaux) != 0))
    {
      __libelf_seterrno (ELF_E_OFFSET_RANGE);
      result = NULL;
    }
  else
    result = (GElf_Verdaux *) memcpy (dst, (char *) data->d_buf + offset,
				      sizeof (GElf_Verdaux));


  rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);

  return result;
}