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      1 /*	$NetBSD: elf_errmsg.c,v 1.6 2025/12/25 18:58:12 jkoshy Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006,2008,2011 Joseph Koshy
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 
     31 #include <libelf.h>
     32 #include <stdio.h>
     33 #include <string.h>
     34 
     35 #include "_libelf.h"
     36 
     37 ELFTC_VCSID("Id: elf_errmsg.c 3977 2022-05-01 06:45:34Z jkoshy");
     38 
     39 __RCSID("$NetBSD: elf_errmsg.c,v 1.6 2025/12/25 18:58:12 jkoshy Exp $");
     40 
     41 /*
     42  * Retrieve a human readable translation for an error message.
     43  */
     44 
     45 static const char *_libelf_errors[] = {
     46 #define	DEFINE_ERROR(N,S)	[ELF_E_##N] = S
     47 	DEFINE_ERROR(NONE,	"No Error"),
     48 	DEFINE_ERROR(ARCHIVE,	"Malformed ar(1) archive"),
     49 	DEFINE_ERROR(ARGUMENT,	"Invalid argument"),
     50 	DEFINE_ERROR(CLASS,	"ELF class mismatch"),
     51 	DEFINE_ERROR(DATA,	"Invalid data buffer descriptor"),
     52 	DEFINE_ERROR(HEADER,	"Missing or malformed ELF header"),
     53 	DEFINE_ERROR(IO,	"I/O error"),
     54 	DEFINE_ERROR(LAYOUT,	"Layout constraint violation"),
     55 	DEFINE_ERROR(MODE,	"Incorrect ELF descriptor mode"),
     56 	DEFINE_ERROR(RANGE,	"Value out of range of target"),
     57 	DEFINE_ERROR(RESOURCE,	"Resource exhaustion"),
     58 	DEFINE_ERROR(SECTION,	"Invalid section descriptor"),
     59 	DEFINE_ERROR(SEQUENCE,	"API calls out of sequence"),
     60 	DEFINE_ERROR(UNIMPL,	"Unimplemented feature"),
     61 	DEFINE_ERROR(VERSION,	"Unknown ELF API version"),
     62 	DEFINE_ERROR(NUM,	"Unknown error")
     63 #undef	DEFINE_ERROR
     64 };
     65 
     66 const char *
     67 elf_errmsg(int error)
     68 {
     69 	int oserr;
     70 
     71 	if (error == ELF_E_NONE &&
     72 	    (error = LIBELF_PRIVATE(error)) == 0)
     73 	    return NULL;
     74 	else if (error == -1)
     75 	    error = LIBELF_PRIVATE(error);
     76 
     77 	oserr = error >> LIBELF_OS_ERROR_SHIFT;
     78 	error &= LIBELF_ELF_ERROR_MASK;
     79 
     80 	if (error < ELF_E_NONE || error >= ELF_E_NUM)
     81 		return _libelf_errors[ELF_E_NUM];
     82 	if (oserr) {
     83 		(void) snprintf((char *) LIBELF_PRIVATE(msg),
     84 		    sizeof(LIBELF_PRIVATE(msg)), "%s: %s",
     85 		    _libelf_errors[error], strerror(oserr));
     86 		return (const char *)&LIBELF_PRIVATE(msg);
     87 	}
     88 	return _libelf_errors[error];
     89 }
     90