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libsystem_error.c
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libsystem_error.c
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/*
* Error string functions
*
* Copyright (c) 2006-2009, Joachim Metz <forensics@hoffmannbv.nl>,
* Hoffmann Investigations.
*
* Refer to AUTHORS for acknowledgements.
*
* This software is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this software. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <memory.h>
#include <narrow_string.h>
#include <types.h>
#include <wide_string.h>
#include <liberror.h>
#if defined( HAVE_ERRNO_H ) || defined( WINAPI )
#include <errno.h>
#endif
#if defined( HAVE_STDLIB_H ) || defined( WINAPI )
#include <stdlib.h>
#endif
#include "libsystem_error.h"
#include "libsystem_string.h"
/* Retrieves a descriptive string of the error number
* Returns 1 if successful or -1 on error
*/
int libsystem_error_copy_to_string(
int error_number,
libsystem_character_t *string,
size_t string_size,
liberror_error_t **error )
{
static char *function = "libsystem_error_copy_to_string";
#if ( defined( HAVE_STRERROR ) && !defined( HAVE_STRERROR_R ) ) || ( defined( WINAPI ) && defined( USE_CRT_FUNCTIONS ) && !defined( _MSC_VER ) )
#if defined( LIBSYSTEM_HAVE_WIDE_CHARACTER )
const wchar_t *static_error_string = NULL;
#else
const char *static_error_string = NULL;
#endif
size_t static_error_string_length = 0;
#endif
if( string == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid string.",
function );
return( -1 );
}
if( string_size > (size_t) SSIZE_MAX )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid string size value exceeds maximum.",
function );
return( -1 );
}
#if defined( WINAPI ) && !defined( USE_CRT_FUNCTIONS )
#if defined( LIBSYSTEM_HAVE_WIDE_CHARACTER )
if( FormatMessageW(
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
(DWORD) error_number,
MAKELANGID(
LANG_NEUTRAL,
SUBLANG_DEFAULT ),
string,
string_size,
NULL ) != 0 )
#else
if( FormatMessageA(
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
(DWORD) error_number,
MAKELANGID(
LANG_NEUTRAL,
SUBLANG_DEFAULT ),
string,
string_size,
NULL ) != 0 )
#endif
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_RUNTIME,
LIBERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to set string.",
function );
return( -1 );
}
/* Use the MSVSC++ specific error string function
*/
#elif defined( _MSC_VER )
#if defined( LIBSYSTEM_HAVE_WIDE_CHARACTER )
if( _wcserror_s(
string,
string_size,
error_number ) != 0 )
#else
if( strerror_s(
string,
string_size,
error_number ) != 0 )
#endif
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_RUNTIME,
LIBERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to set string.",
function );
return( -1 );
}
/* Use the POSIX specific error string function
*/
#elif defined( HAVE_STRERROR_R )
/* Sanity check
*/
#if defined( LIBSYSTEM_HAVE_WIDE_CHARACTER )
#error Missing wide character strerror_r function
#endif
#if defined( STRERROR_R_CHAR_P )
if( strerror_r(
error_number,
string,
string_size ) == NULL )
#else
if( strerror_r(
error_number,
string,
string_size ) != 0 )
#endif
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_RUNTIME,
LIBERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to set string.",
function );
return( -1 );
}
/* Use the static error string function
*/
#elif defined( HAVE_STRERROR ) || defined( WINAPI )
/* Sanity check
*/
#if defined( LIBSYSTEM_HAVE_WIDE_CHARACTER ) && !defined( WINAPI )
#error Missing wide character strerror function
#endif
#if defined( LIBSYSTEM_HAVE_WIDE_CHARACTER )
static_error_string = _wcserror(
error_number );
#else
static_error_string = strerror(
error_number );
#endif
if( static_error_string == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_RUNTIME,
LIBERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to create static error string.",
function );
return( -1 );
}
static_error_string_length = libsystem_string_length(
static_error_string );
if( libsystem_string_copy(
string,
static_error_string,
static_error_string_length ) == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_RUNTIME,
LIBERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to set string.",
function );
return( -1 );
}
string[ static_error_string_length ] = 0;
#else
#error Missing strerror function
#endif
return( 1 );
}

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