1 /* Get section at specific index.
2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004 Red Hat, Inc.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 2.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17
18 #ifdef HAVE_CONFIG_H
19 # include <config.h>
20 #endif
21
22 #include <assert.h>
23 #include <stddef.h>
24 #include <stdlib.h>
25
26 #include "libelfP.h"
27
28
29 Elf_Scn *
elf_getscn(elf,idx)30 elf_getscn (elf, idx)
31 Elf *elf;
32 size_t idx;
33 {
34 if (elf == NULL)
35 return NULL;
36
37 if (unlikely (elf->kind != ELF_K_ELF))
38 {
39 __libelf_seterrno (ELF_E_INVALID_HANDLE);
40 return NULL;
41 }
42
43 rwlock_rdlock (elf->lock);
44
45 Elf_Scn *result = NULL;
46
47 /* Find the section in the list. */
48 Elf_ScnList *runp = (elf->class == ELFCLASS32
49 || (offsetof (struct Elf, state.elf32.scns)
50 == offsetof (struct Elf, state.elf64.scns))
51 ? &elf->state.elf32.scns : &elf->state.elf64.scns);
52 while (1)
53 {
54 if (idx < runp->max)
55 {
56 if (idx < runp->cnt)
57 result = &runp->data[idx];
58 else
59 __libelf_seterrno (ELF_E_INVALID_INDEX);
60 break;
61 }
62
63 idx -= runp->max;
64
65 runp = runp->next;
66 if (runp == NULL)
67 {
68 __libelf_seterrno (ELF_E_INVALID_INDEX);
69 break;
70 }
71 }
72
73 rwlock_unlock (elf->lock);
74
75 return result;
76 }
77 INTDEF(elf_getscn)
78