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  
35  ELFTC_VCSID("$Id$");
36  
37  char *
38  elf_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  }