1 /* Get next section.
2 Copyright (C) 1998, 1999, 2000, 2001, 2002 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 <libelf.h>
24 #include <stddef.h>
25
26 #include "libelfP.h"
27
28
29 Elf_Scn *
elf_nextscn(elf,scn)30 elf_nextscn (elf, scn)
31 Elf *elf;
32 Elf_Scn *scn;
33 {
34 Elf_Scn *result = NULL;
35
36 if (elf == NULL)
37 return NULL;
38
39 rwlock_rdlock (elf->lock);
40
41 if (scn == NULL)
42 {
43 /* If no section handle is given return the first (not 0th) section. */
44 if (elf->class == ELFCLASS32
45 || (offsetof (Elf, state.elf32.scns)
46 == offsetof (Elf, state.elf64.scns)))
47 {
48 if (elf->state.elf32.scns.cnt > 1)
49 result = &elf->state.elf32.scns.data[1];
50 }
51 else
52 {
53 if (elf->state.elf64.scns.cnt > 1)
54 result = &elf->state.elf64.scns.data[1];
55 }
56 }
57 else
58 {
59 Elf_ScnList *list = scn->list;
60
61 if (scn + 1 < &list->data[list->cnt])
62 result = scn + 1;
63 else if (scn + 1 == &list->data[list->max]
64 && (list = list->next) != NULL)
65 {
66 /* If there is another element in the section list it must
67 have at least one entry. */
68 assert (list->cnt > 0);
69 result = &list->data[0];
70 }
71 }
72
73 rwlock_unlock (elf->lock);
74
75 return result;
76 }
77 INTDEF(elf_nextscn)
78