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libsystem_getopt.c
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libsystem_getopt.c
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/*
* GetOpt 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 <types.h>
#if defined( HAVE_STDLIB_H ) || defined( WINAPI )
#include <stdlib.h>
#endif
#include "libsystem_getopt.h"
#include "libsystem_notify.h"
#include "libsystem_string.h"
#if !defined( HAVE_GETOPT )
/* The current option argument
*/
libsystem_character_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
*/
libsystem_integer_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
*/
libsystem_integer_t libsystem_getopt(
int argument_count,
libsystem_character_t * const argument_values[],
const libsystem_character_t *options_string )
{
libsystem_character_t *option_value = NULL;
libsystem_character_t *argument_value = NULL;
static char *function = "libsystem_getopt";
if( optind >= argument_count )
{
return( (libsystem_integer_t) -1 );
}
argument_value = argument_values[ optind ];
/* Check if the argument value is not an empty string
*/
if( *argument_value == (libsystem_character_t) '\0' )
{
return( (libsystem_integer_t) -1 );
}
/* Check if the first character is a option marker '-'
*/
if( *argument_value != (libsystem_character_t) '-' )
{
return( (libsystem_integer_t) -1 );
}
argument_value++;
/* Check if long options are provided '--'
*/
if( *argument_value == (libsystem_character_t) '-' )
{
optind++;
return( (libsystem_integer_t) -1 );
}
optopt = *argument_value;
option_value = libsystem_string_search(
options_string,
optopt,
libsystem_string_length(
options_string ) );
argument_value++;
/* Check if an argument was specified or that the option was not found
* in the option string
*/
if( ( optopt == (libsystem_integer_t) ':' )
|| ( option_value == NULL ) )
{
if( *argument_value == (libsystem_character_t) '\0' )
{
optind++;
}
if( ( *options_string != (libsystem_character_t) ':' )
&& ( optopt != (libsystem_integer_t) '?' ) )
{
libsystem_notify_printf(
"%s: no such option: %" PRIc_LIBSYSTEM ".\n",
function,
optopt );
}
return( (libsystem_integer_t) '?' );
}
option_value++;
/* Check if no option argument is required
*/
if( *option_value != (libsystem_character_t) ':' )
{
optarg = NULL;
if( *argument_value == (libsystem_character_t) '\0' )
{
optind++;
}
}
/* Check if the argument is right after the option flag with no space in between
*/
else if( *argument_value != (libsystem_character_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( (libsystem_integer_t) ':' );
}
libsystem_notify_printf(
"%s: option: %" PRIc_LIBSYSTEM " requires an argument.\n",
function,
optopt );
return( (libsystem_integer_t) '?' );
}
optarg = argument_values[ optind ];
optind++;
}
return( optopt );
}
#endif

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