gelf_getverdaux.c revision 1e9ef50681e20ef14c2ba38aef37a71ff148be08 
1/* Get additional symbol version definition information at the given offset.
2   Copyright (C) 1999, 2000, 2001, 2002 Red Hat, Inc.
3   This file is part of Red Hat elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 1999.
5
6   Red Hat elfutils is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by the
8   Free Software Foundation; version 2 of the License.
9
10   Red Hat elfutils is distributed in the hope that it will be useful, but
11   WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   General Public License for more details.
14
15   You should have received a copy of the GNU General Public License along
16   with Red Hat elfutils; if not, write to the Free Software Foundation,
17   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
18
19   In addition, as a special exception, Red Hat, Inc. gives You the
20   additional right to link the code of Red Hat elfutils with code licensed
21   under any Open Source Initiative certified open source license
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23   distribution of source code with any binary distribution and to
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25   this exception must only link to the code of Red Hat elfutils through
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36   code used in conjunction with Red Hat elfutils except the Non-GPL Code
37   covered by this exception.  If you modify this file, you may extend this
38   exception to your version of the file, but you are not obligated to do
39   so.  If you do not wish to provide this exception without modification,
40   you must delete this exception statement from your version and license
41   this file solely under the GPL without exception.
42
43   Red Hat elfutils is an included package of the Open Invention Network.
44   An included package of the Open Invention Network is a package for which
45   Open Invention Network licensees cross-license their patents.  No patent
46   license is granted, either expressly or impliedly, by designation as an
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49   <http://www.openinventionnetwork.com>.  */
50
51#ifdef HAVE_CONFIG_H
52# include <config.h>
53#endif
54
55#include <assert.h>
56#include <gelf.h>
57#include <string.h>
58
59#include "libelfP.h"
60
61
62GElf_Verdaux *
63gelf_getverdaux (data, offset, dst)
64     Elf_Data *data;
65     int offset;
66     GElf_Verdaux *dst;
67{
68  GElf_Verdaux *result;
69
70  if (data == NULL)
71    return NULL;
72
73  if (unlikely (data->d_type != ELF_T_VDEF))
74    {
75      __libelf_seterrno (ELF_E_INVALID_HANDLE);
76      return NULL;
77    }
78
79  /* It's easy to handle this type.  It has the same size for 32 and
80     64 bit objects.  */
81  assert (sizeof (GElf_Verdaux) == sizeof (Elf32_Verdaux));
82  assert (sizeof (GElf_Verdaux) == sizeof (Elf64_Verdaux));
83
84  rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock);
85
86  /* The data is already in the correct form.  Just make sure the
87     index is OK.  */
88  if (unlikely (offset < 0)
89      || unlikely (offset + sizeof (GElf_Verdaux) > data->d_size)
90      || unlikely (offset % __alignof__ (GElf_Verdaux) != 0))
91    {
92      __libelf_seterrno (ELF_E_OFFSET_RANGE);
93      result = NULL;
94    }
95  else
96    result = (GElf_Verdaux *) memcpy (dst, (char *) data->d_buf + offset,
97				      sizeof (GElf_Verdaux));
98
99
100  rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);
101
102  return result;
103}
104