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log_handle.c
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log_handle.c
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/*
* Log handle
*
* Copyright (c) 2009-2012, Joachim Metz <jbmetz@users.sourceforge.net>
*
* 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 <file_stream.h>
#include <memory.h>
#include <types.h>
#include <libcstring.h>
#include <liberror.h>
#if defined( HAVE_STDARG_H ) || defined( WINAPI )
#include <stdarg.h>
#elif defined( HAVE_VARARGS_H )
#include <varargs.h>
#else
#error Missing headers stdarg.h and varargs.h
#endif
#include <libsystem.h>
#include "log_handle.h"
/* Initializes the log handle
* Returns 1 if successful or -1 on error
*/
int log_handle_initialize(
log_handle_t **log_handle,
liberror_error_t **error )
{
static char *function = "log_handle_initialize";
if( log_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid log handle.",
function );
return( -1 );
}
if( *log_handle != NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_RUNTIME,
LIBERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,
"%s: invalid log handle value already set.",
function );
return( -1 );
}
*log_handle = memory_allocate_structure(
log_handle_t );
if( *log_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_MEMORY,
LIBERROR_MEMORY_ERROR_INSUFFICIENT,
"%s: unable to create log handle.",
function );
goto on_error;
}
if( memory_set(
*log_handle,
0,
sizeof( log_handle_t ) ) == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_MEMORY,
LIBERROR_MEMORY_ERROR_SET_FAILED,
"%s: unable to clear log handle.",
function );
goto on_error;
}
return( 1 );
on_error:
if( *log_handle != NULL )
{
memory_free(
*log_handle );
*log_handle = NULL;
}
return( -1 );
}
/* Frees the log handle and its elements
* Returns 1 if successful or -1 on error
*/
int log_handle_free(
log_handle_t **log_handle,
liberror_error_t **error )
{
static char *function = "log_handle_free";
if( log_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid log handle.",
function );
return( -1 );
}
if( *log_handle != NULL )
{
memory_free(
*log_handle );
*log_handle = NULL;
}
return( 1 );
}
/* Opens the log handle
* Returns 1 if successful or -1 on error
*/
int log_handle_open(
log_handle_t *log_handle,
const libcstring_system_character_t *filename,
liberror_error_t **error )
{
static char *function = "log_handle_open";
if( log_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid log handle.",
function );
return( -1 );
}
if( filename != NULL )
{
log_handle->log_stream = libsystem_file_stream_open(
filename,
_LIBCSTRING_SYSTEM_STRING( FILE_STREAM_OPEN_APPEND ) );
if( log_handle->log_stream == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_IO,
LIBERROR_IO_ERROR_OPEN_FAILED,
"%s: unable to open file.",
function );
return( -1 );
}
}
return( 1 );
}
/* Closes the log handle
* Returns the 0 if succesful or -1 on error
*/
int log_handle_close(
log_handle_t *log_handle,
liberror_error_t **error )
{
static char *function = "log_handle_close";
if( log_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid log handle.",
function );
return( -1 );
}
if( log_handle->log_stream != NULL )
{
if( libsystem_file_stream_close(
log_handle->log_stream ) != 0 )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_IO,
LIBERROR_IO_ERROR_CLOSE_FAILED,
"%s: unable to close log stream.",
function );
return( -1 );
}
log_handle->log_stream = NULL;
}
return( 0 );
}
#if defined( HAVE_STDARG_H ) || defined( WINAPI )
#define VARARGS( function, type, argument ) \
function( log_handle_t *log_handle, type argument, ... )
#define VASTART( argument_list, type, name ) \
va_start( argument_list, name )
#define VAEND( argument_list ) \
va_end( argument_list )
#elif defined( HAVE_VARARGS_H )
#define VARARGS( function, type, argument ) \
function( log_handle_t *log_handle, va_alist ) va_dcl
#define VASTART( argument_list, type, name ) \
{ type name; va_start( argument_list ); name = va_arg( argument_list, type )
#define VAEND( argument_list ) \
va_end( argument_list ); }
#endif
/* Print a formatted string on the notify stream
*/
void VARARGS(
log_handle_printf,
char *,
format )
{
va_list argument_list;
if( ( log_handle != NULL )
&& ( log_handle->log_stream != NULL ) )
{
VASTART(
argument_list,
char *,
format );
vfprintf(
log_handle->log_stream,
format,
argument_list );
VAEND(
argument_list );
}
}
#undef VARARGS
#undef VASTART
#undef VAEND

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