elf_getident.c revision 260684
1/*-
2 * Copyright (c) 2006,2008 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28
29#include <ar.h>
30#include <assert.h>
31#include <libelf.h>
32
33#include "_libelf.h"
34
35ELFTC_VCSID("$Id: elf_getident.c 2225 2011-11-26 18:55:54Z jkoshy $");
36
37char *
38elf_getident(Elf *e, size_t *sz)
39{
40
41	if (e == NULL) {
42		LIBELF_SET_ERROR(ARGUMENT, 0);
43		goto error;
44	}
45
46	if (e->e_cmd == ELF_C_WRITE && e->e_rawfile == NULL) {
47		LIBELF_SET_ERROR(SEQUENCE, 0);
48		goto error;
49	}
50
51	assert(e->e_kind != ELF_K_AR || e->e_cmd == ELF_C_READ);
52
53	if (sz) {
54		if (e->e_kind == ELF_K_AR)
55			*sz = SARMAG;
56		else if (e->e_kind == ELF_K_ELF)
57			*sz = EI_NIDENT;
58		else
59			*sz = e->e_rawsize;
60	}
61
62	return ((char *) e->e_rawfile);
63
64 error:
65	if (sz)
66		*sz = 0;
67	return (NULL);
68}
69