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/*
getopt_long.c - implementation of getopt_long() for systems that lack it
Copyright (C) 2001, 2002, 2008, 2012 Arthur de Jong
This library 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 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "getopt_long.h"
/* this is a (poor) getopt_long() replacement for systems that don't have it
(this is generally a GNU extension)
this implementation is by no means flawless, especially the optional
arguments to options and options following filenames is not quite right,
also minimal error checking is performed
*/
int getopt_long(int argc, char *const argv[],
const char *optstring,
const struct option *longopts, int *longindex)
{
int i, l;
/* first check if there realy is a -- option */
if ((optind > 0) && (optind < argc) &&
(strncmp(argv[optind], "--", 2) == 0) &&
(argv[optind][2] != '\0'))
{
/* check the longopts list for a valid option */
for (i = 0; longopts[i].name != NULL; i++)
{
/* save the length for later */
l = strlen(longopts[i].name);
if (strncmp(argv[optind] + 2, longopts[i].name, l) == 0)
{
/* we have a match */
if ((longopts[i].has_arg == no_argument) &&
(argv[optind][2 + l] == '\0'))
{
optind++;
return longopts[i].val;
}
else if ((longopts[i].has_arg == required_argument) &&
(argv[optind][2 + l] == '='))
{
optarg = argv[optind] + 3 + l;
optind++;
return longopts[i].val;
}
else if ((longopts[i].has_arg == required_argument) &&
(argv[optind][2 + l] == '\0'))
{
optarg = argv[optind + 1];
optind += 2;
return longopts[i].val;
}
else if ((longopts[i].has_arg == optional_argument) &&
(argv[optind][2 + l] == '='))
{
optarg = argv[optind] + 3 + l;
optind++;
return longopts[i].val;
}
else if ((longopts[i].has_arg == optional_argument) &&
(argv[optind][2 + l] == '\0'))
{
optind++;
return longopts[i].val;
}
}
}
}
/* if all else fails use plain getopt() */
return getopt(argc, argv, optstring);
}
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