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ewfgetopt.c
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ewfgetopt.c
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/*
* ewfgetopt
* GetOpt functions for the libewf tools
*
* Copyright (c) 2006-2007, Joachim Metz <forensics@hoffmannbv.nl>,
* Hoffmann Investigations. All rights reserved.
*
* Refer to AUTHORS for acknowledgements.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the creator, related organisations, nor the names of
* its contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
* - All advertising materials mentioning features or use of this software
* must acknowledge the contribution by people stated in the acknowledgements.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER, COMPANY AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "../libewf/libewf_includes.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "../libewf/libewf_notify.h"
#include "ewfgetopt.h"
#ifndef HAVE_GETOPT
/* The current option argument
*/
CHAR_T *optarg = NULL;
/* The option index
* Start with argument 1 (argument 0 is the program name)
*/
int optind = 1;
/* Value to indicate the current option
*/
INT_T optopt = 0;
/* Get the program options
* Function for platforms that do not have the getopt function
* Returns the option character processed, or -1 on error,
* ? if the option was not in the options string, : if the option argument was missing
*/
INT_T ewfgetopt( int argument_count, CHAR_T * const argument_values[], const CHAR_T *options_string )
{
CHAR_T *option_value = NULL;
CHAR_T *argument_value = NULL;
if( optind >= argument_count )
{
return( -1 );
}
argument_value = argument_values[ optind ];
/* Check if the argument value is not an empty string
*/
if( *argument_value == (CHAR_T) '\0' )
{
return( -1 );
}
/* Check if the first character is a option marker '-'
*/
if( *argument_value != (CHAR_T) '-' )
{
return( -1 );
}
argument_value++;
/* Check if long options are provided '--'
*/
if( *argument_value == (CHAR_T) '-' )
{
optind++;
return( -1 );
}
optopt = *argument_value;
option_value = CHAR_T_SEARCH( options_string, optopt, CHAR_T_LENGTH( options_string ) );
argument_value++;
/* Check if an argument was specified or that the option was not found
* in the option string
*/
if( ( optopt == (INT_T) ':' ) || ( option_value == NULL ) )
{
if( *argument_value == (CHAR_T) '\0' )
{
optind++;
}
if( ( *options_string != (CHAR_T) ':' ) && ( optopt != (INT_T) '?' ) )
{
LIBEWF_WARNING_PRINT( "ewfgetopt: no such option: %" PRIc ".\n", optopt );
}
return( (INT_T) '?' );
}
option_value++;
/* Check if no option argument is required
*/
if( *option_value != (CHAR_T) ':' )
{
optarg = NULL;
if( *argument_value == (CHAR_T) '\0' )
{
optind++;
}
}
/* Check if the argument is right after the option flag with no space in between
*/
else if( *argument_value != (CHAR_T) '\0' )
{
optarg = argument_value;
optind++;
}
else
{
optind++;
/* Check if the argument was provided as the next argument value
*/
if( argument_count <= optind )
{
if( *option_value == ':' )
{
return( (INT_T) ':' );
}
LIBEWF_WARNING_PRINT( "ewfgetopt: option: %" PRIc " requires an argument.\n", optopt );
return( (INT_T) '?' );
}
optarg = argument_values[ optind ];
optind++;
}
return( (INT_T) optopt );
}
#endif

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