1/*-
2 * Copyright (c) 2006,2008,2011 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 <libelf.h>
28#include <stdio.h>
29#include <string.h>
30
31#include "_libelf.h"
32
33ELFTC_VCSID("$Id: elf_errmsg.c 3174 2015-03-27 17:13:41Z emaste $");
34
35/*
36 * Retrieve a human readable translation for an error message.
37 */
38
39static const char *_libelf_errors[] = {
40#define	DEFINE_ERROR(N,S)	[ELF_E_##N] = S
41	DEFINE_ERROR(NONE,	"No Error"),
42	DEFINE_ERROR(ARCHIVE,	"Malformed ar(1) archive"),
43	DEFINE_ERROR(ARGUMENT,	"Invalid argument"),
44	DEFINE_ERROR(CLASS,	"ELF class mismatch"),
45	DEFINE_ERROR(DATA,	"Invalid data buffer descriptor"),
46	DEFINE_ERROR(HEADER,	"Missing or malformed ELF header"),
47	DEFINE_ERROR(IO,	"I/O error"),
48	DEFINE_ERROR(LAYOUT,	"Layout constraint violation"),
49	DEFINE_ERROR(MODE,	"Incorrect ELF descriptor mode"),
50	DEFINE_ERROR(RANGE,	"Value out of range of target"),
51	DEFINE_ERROR(RESOURCE,	"Resource exhaustion"),
52	DEFINE_ERROR(SECTION,	"Invalid section descriptor"),
53	DEFINE_ERROR(SEQUENCE,	"API calls out of sequence"),
54	DEFINE_ERROR(UNIMPL,	"Unimplemented feature"),
55	DEFINE_ERROR(VERSION,	"Unknown ELF API version"),
56	DEFINE_ERROR(NUM,	"Unknown error")
57#undef	DEFINE_ERROR
58};
59
60const char *
61elf_errmsg(int error)
62{
63	int oserr;
64
65	if (error == ELF_E_NONE &&
66	    (error = LIBELF_PRIVATE(error)) == 0)
67	    return NULL;
68	else if (error == -1)
69	    error = LIBELF_PRIVATE(error);
70
71	oserr = error >> LIBELF_OS_ERROR_SHIFT;
72	error &= LIBELF_ELF_ERROR_MASK;
73
74	if (error < ELF_E_NONE || error >= ELF_E_NUM)
75		return _libelf_errors[ELF_E_NUM];
76	if (oserr) {
77		(void) snprintf((char *) LIBELF_PRIVATE(msg),
78		    sizeof(LIBELF_PRIVATE(msg)), "%s: %s",
79		    _libelf_errors[error], strerror(oserr));
80		return (const char *)&LIBELF_PRIVATE(msg);
81	}
82	return _libelf_errors[error];
83}
84