1/* Return number of sections in the ELF file.
2   Copyright (C) 2002, 2009, 2015 Red Hat, Inc.
3   This file is part of elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6   This file is free software; you can redistribute it and/or modify
7   it under the terms of either
8
9     * the GNU Lesser General Public License as published by the Free
10       Software Foundation; either version 3 of the License, or (at
11       your option) any later version
12
13   or
14
15     * the GNU General Public License as published by the Free
16       Software Foundation; either version 2 of the License, or (at
17       your option) any later version
18
19   or both in parallel, as here.
20
21   elfutils is distributed in the hope that it will be useful, but
22   WITHOUT ANY WARRANTY; without even the implied warranty of
23   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
24   General Public License for more details.
25
26   You should have received copies of the GNU General Public License and
27   the GNU Lesser General Public License along with this program.  If
28   not, see <http://www.gnu.org/licenses/>.  */
29
30#ifdef HAVE_CONFIG_H
31# include <config.h>
32#endif
33
34#include <assert.h>
35#include <gelf.h>
36#include <stddef.h>
37
38#include "libelfP.h"
39
40
41int
42internal_function
43__elf_getshdrnum_rdlock (Elf *elf, size_t *dst)
44{
45  int result = 0;
46  int idx;
47
48  if (elf == NULL)
49    return -1;
50
51  if (unlikely (elf->kind != ELF_K_ELF))
52    {
53      __libelf_seterrno (ELF_E_INVALID_HANDLE);
54      return -1;
55    }
56
57  idx = elf->state.elf.scns_last->cnt;
58  if (idx != 0
59      || (elf->state.elf.scns_last
60	  != (elf->class == ELFCLASS32
61	      || (offsetof (Elf, state.elf32.scns)
62		  == offsetof (Elf, state.elf64.scns))
63	      ? &elf->state.elf32.scns : &elf->state.elf64.scns)))
64    /* There is at least one section.  */
65    *dst = 1 + elf->state.elf.scns_last->data[idx - 1].index;
66  else
67    *dst = 0;
68
69  return result;
70}
71
72int
73elf_getshdrnum (Elf *elf, size_t *dst)
74{
75  int result;
76
77  if (elf == NULL)
78    return -1;
79
80  rwlock_rdlock (elf->lock);
81  result = __elf_getshdrnum_rdlock (elf, dst);
82  rwlock_unlock (elf->lock);
83
84  return result;
85}
86/* Alias for the deprecated name.  */
87strong_alias (elf_getshdrnum, elf_getshnum)
88