1 /* Retrieve file identification data.
2 Copyright (C) 1998, 1999, 2000, 2002, 2004 Red Hat, Inc.
3 Written 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 <stddef.h>
23
24 #include "libelfP.h"
25
26
27 char *
elf_getident(elf,ptr)28 elf_getident (elf, ptr)
29 Elf *elf;
30 size_t *ptr;
31 {
32 /* In case this is no ELF file, the handle is invalid and we return
33 NULL. */
34 if (elf == NULL || elf->kind != ELF_K_ELF)
35 {
36 if (ptr != NULL)
37 *ptr = 0;
38 return NULL;
39 }
40
41 /* We already read the ELF header. Return a pointer to it and store
42 the length in *PTR. */
43 if (ptr != NULL)
44 *ptr = EI_NIDENT;
45
46 return (char *) (elf->class == ELFCLASS32
47 || (offsetof (struct Elf, state.elf32.ehdr)
48 == offsetof (struct Elf, state.elf64.ehdr))
49 ? elf->state.elf32.ehdr->e_ident
50 : elf->state.elf64.ehdr->e_ident);
51 }
52