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error_string.c
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error_string.c
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/*
* Error string functions
*
* Copyright (c) 2006-2009, Joachim Metz <forensics@hoffmannbv.nl>,
* Hoffmann Investigations. All rights reserved.
*
* 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 "notify.h"
#include <errno.h>
#if defined( HAVE_STDLIB_H )
#include <stdlib.h>
#endif
#if defined( HAVE_STRING_H )
#include <string.h>
#endif
#include "error_string.h"
#if defined( error_string_strerror_r ) || defined( HAVE_STRERROR )
/* Function to wrap strerror()
* Returns a new instance to a string containing the error string, NULL on error
*/
char *error_string_strerror(
int error_number )
{
static char *function = "error_string_strerror";
#if !defined( error_string_strerror_r ) && defined( HAVE_STRERROR )
char *static_error_string = NULL;
#endif
#if defined( error_string_strerror_r ) || defined( HAVE_STRERROR )
char *error_string = NULL;
size_t error_string_size = 256;
error_string = (char *) memory_allocate(
sizeof( char ) * error_string_size );
if( error_string == NULL )
{
notify_warning_printf( "%s: unable to create error string.\n",
function );
return( NULL );
}
#endif
#if defined( error_string_strerror_r )
if( error_string_strerror_r(
error_number,
error_string,
error_string_size ) != ERROR_STRING_STRERROR_R_RETURN_ERROR )
{
notify_warning_printf( "%s: unable to set error string.\n",
function );
memory_free(
error_string );
return( NULL );
}
return( error_string );
#elif defined( HAVE_STRERROR )
static_error_string = strerror(
error_number );
if( static_error_string == NULL )
{
notify_warning_printf( "%s: unable to create static error string.\n",
function );
memory_free(
error_string );
return( NULL );
}
if( memory_copy(
error_string,
static_error_string,
error_string_size ) == NULL )
{
notify_warning_printf( "%s: unable to set error string.\n",
function );
memory_free(
error_string );
return( NULL );
}
return( error_string );
#endif
}
#endif
#if defined( error_string_wcserror_r )
/* Function to wrap wide character equivalent of strerror()
* Returns a new instance to a string containing the error string, NULL on error
*/
wchar_t *error_string_wcserror(
int error_number )
{
static char *function = "error_string_wcserror";
wchar_t *error_string = NULL;
uint16_t error_string_size = 256;
error_string = (wchar_t *) memory_allocate(
sizeof( wchar_t ) * error_string_size );
if( error_string == NULL )
{
notify_warning_printf( "%s: unable to create error string.\n",
function );
return( NULL );
}
if( error_string_wcserror_r(
error_number,
error_string,
error_string_size ) != ERROR_STRING_STRERROR_R_RETURN_ERROR )
{
notify_warning_printf( "%s: unable to set error string.\n",
function );
memory_free(
error_string );
return( NULL );
}
return( error_string );
}
#endif

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