elf_errmsg.c revision 8349 
1/*-
2 * Copyright (c) 2006 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
28#include <string.h>
29
30#include "_libelf.h"
31#include "libelf.h"
32
33/*
34 * Retrieve a human readable translation for an error message.
35 */
36
37const char *_libelf_errors[] = {
38#define	DEFINE_ERROR(N,S)	[ELF_E_##N] = S
39        DEFINE_ERROR(NONE,	"No Error"),
40        DEFINE_ERROR(ARCHIVE,	"Malformed ar(1) archive"),
41        DEFINE_ERROR(ARGUMENT,	"Invalid argument"),
42        DEFINE_ERROR(CLASS,	"ELF class mismatch"),
43        DEFINE_ERROR(DATA,	"Invalid data buffer descriptor"),
44        DEFINE_ERROR(HEADER,	"Missing or malformed ELF header"),
45        DEFINE_ERROR(IO,	"I/O error"),
46        DEFINE_ERROR(LAYOUT,	"Layout constraint violation"),
47        DEFINE_ERROR(MODE,	"Incorrect ELF descriptor mode"),
48        DEFINE_ERROR(RANGE,	"Value out of range of target"),
49        DEFINE_ERROR(RESOURCE,	"Resource exhaustion"),
50        DEFINE_ERROR(SECTION,	"Invalid section descriptor"),
51        DEFINE_ERROR(SEQUENCE,	"API calls out of sequence"),
52        DEFINE_ERROR(UNIMPL,	"Unimplemented feature"),
53        DEFINE_ERROR(VERSION,	"Unknown ELF API version"),
54        DEFINE_ERROR(NUM,	"Unknown error")
55#undef	DEFINE_ERROR
56};
57
58const char *
59elf_errmsg(int error)
60{
61        int oserr;
62
63        if (error == 0 && (error = LIBELF_PRIVATE(error)) == 0)
64            return NULL;
65        else if (error == -1)
66            error = LIBELF_PRIVATE(error);
67
68        oserr = error >> LIBELF_OS_ERROR_SHIFT;
69        error &= LIBELF_ELF_ERROR_MASK;
70
71        if (error < 0 || error >= ELF_E_NUM)
72                return _libelf_errors[ELF_E_NUM];
73        if (oserr) {
74                strncpy(LIBELF_PRIVATE(msg), _libelf_errors[error],
75                    sizeof(LIBELF_PRIVATE(msg)));
76                strncat(LIBELF_PRIVATE(msg), ": ", sizeof(LIBELF_PRIVATE(msg)));
77                strncat(LIBELF_PRIVATE(msg), strerror(oserr),
78                    sizeof(LIBELF_PRIVATE(msg)));
79                return (const char *)&LIBELF_PRIVATE(msg);
80        }
81        return _libelf_errors[error];
82}
83