/*
 * opt.c
 * 
 * Parsing command line for Multicast Application
 *
 * function: options(argc, argv)
 * 
 * Written by Philippe Dax (ENST) - (C) 1995
 */

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

extern char *optarg;
extern int optind, opterr, optopt;

/*
 * global variables
 */
char * group;
char * session;
char * media;
char * format;
unsigned char ttl;
unsigned short port;
int multicast, unicast;
int debug =0;

void usage(char * progname)
{
	fprintf(stderr,
		"Usage: %s [-d] [-h] \
			[-S \"session-name\"] \
			[-M \"media-name\"] \
			[-f format-name] \
			[-t ttl] \
			group/port/ttl\n",
		progname);
	exit(1);
}

void options(int argc, char ** argv)
{
	int c;
	char *s;

	while ((c = getopt(argc, argv, "hdt:S:M:f:")) != EOF) {
		switch(c) {
		case 'S': /* Session name */
			session = optarg;
			break;
		case 'M': /* Media name */
			media = optarg;
			break;
		case 'f': /* Format name */
			format = optarg;
			break;
		case 't': /* ttl scope value */
			ttl = atoi(optarg);
			break;
		case 'd': /* debugging */
			debug = 1;
			break;
		case 'h':
		default :
			usage(argv[0]);
		}
	}
	if (optind == argc)
		usage(argv[0]);
	group = argv[optind];
	s = strchr(group, '/');
	if (*s) {
		*s = '\0';
		port = atoi(s+1);
		if (!port || port > 65535) {
			fprintf(stderr, "Bad port number\n");
			exit(1);
		}
	}
	if (IN_MULTICAST(group)) {
		multicast = 1;
		unicast = 0;
	}
	else {
		multicast = 0;
		unicast = 1;
	}
	s = strchr(s+1, '/');
	if (*s) {
		ttl = atoi(s+1);
		ttl = (ttl <= 255) ? ttl : 255;
		ttl = (ttl != 0) ? ttl : 1;
	}
	if (debug)
		fprintf(stderr, "group/port/ttl: %s/%d/%d\n", group, port, ttl);
}