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 <ar.h>
28 #include <assert.h>
29 #include <libelf.h>
30 
31 #include "_libelf.h"
32 
33 ELFTC_VCSID("$Id: elf_getident.c 3174 2015-03-27 17:13:41Z emaste $");
34 
35 char *
36 elf_getident(Elf *e, size_t *sz)
37 {
38 
39 	if (e == NULL) {
40 		LIBELF_SET_ERROR(ARGUMENT, 0);
41 		goto error;
42 	}
43 
44 	if (e->e_cmd == ELF_C_WRITE && e->e_rawfile == NULL) {
45 		LIBELF_SET_ERROR(SEQUENCE, 0);
46 		goto error;
47 	}
48 
49 	assert(e->e_kind != ELF_K_AR || e->e_cmd == ELF_C_READ);
50 
51 	if (sz) {
52 		if (e->e_kind == ELF_K_AR)
53 			*sz = SARMAG;
54 		else if (e->e_kind == ELF_K_ELF)
55 			*sz = EI_NIDENT;
56 		else
57 			*sz = e->e_rawsize;
58 	}
59 
60 	return ((char *) e->e_rawfile);
61 
62  error:
63 	if (sz)
64 		*sz = 0;
65 	return (NULL);
66 }
67