/*
 *   VUOS: view OS project
 *   Copyright (C) 2017  Renzo Davoli <renzo@cs.unibo.it>, Antonio Cardace <anto.cardace@gmail.com>
 *   VirtualSquare team.
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <libgen.h>
#include <getopt.h>
#include <vulib.h>

static char *progname;
void usage()
{
	fprintf(stderr,
			"Usage:\n"
			"  %s OPTIONS\n"
			"  OPTIONS:\n"
			"    -h --help:  print this help message\n\n", progname);
	exit(2);
}

static const char *short_options = "p";
static const struct option long_options[] = {
	{"help",0,0,'h'},
	{0,0,0,0}
};

int main(int argc, char *argv[])
{
	int c;
	progname = basename(argv[0]);
	size_t bufsize;
	if (vu_check() < 0) {
		fprintf(stderr,"This is a VUOS command."
				"It works only inside a vuos virtual namespace\n");
		usage();
	}
	while (1) {
		c=getopt_long(argc, argv,
				short_options, long_options, NULL);
		if (c == -1) break;
		switch (c) {
			case 'h': usage();
								break;
		}
	}
	if (argc - optind > 0)
		usage();
	if ((bufsize = vu_lsmod(NULL, 0)) > 0) {
		char buf[bufsize];
		if (vu_lsmod(buf, bufsize) < 0)
			perror(progname);
		else
			printf("%s", buf);
	}
	return 0;
}