Récupérer les arguments de la ligne de commande avec getopt_long

#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
 
/* The name of this program */
const char* program_name;
 
/* Print infos about program version and authors */
void print_versionInfo()
{
	printf("you are running version %.3lf\n", VERSION);
	printf("this program was developped by %s\n",AUTHORS);
	printf("you can find some information on bidon's project page at %s\n",WEBSITE);
	exit(EXIT_SUCCESS);
}
 
/* Print help an exit with exit code exit_msg */
void print_help(FILE *stream, int exit_msg)
{
	fprintf(stream,"usage : %s [ options ]\n",program_name);
	printf("valid options are :\n");
	fprintf(stream,
	"  -h  --help\t print this message\n"
	"  -s  --server server_name\t	the name of the server you want to connect to\n"
	"  -P  --port port_number\t this not a needed option, you may used it if you want to connecter on port\
#port_number instead of default 5222\n"
	"  -l  --login gid\t login into server_name with gid as your login. You need your full gid.\
i.e. if you are toto and your account is on jabber.clubnix.esiee.fr you need to do :\n \
%s -s jabber.clubnix.esiee.fr -l toto@jabber.clubnix.esiee.fr\n"
	"  -p --passwd password\t it is your password\n"
	"  -r --recipient recipient\t your messages will be sent to recipient"
	"  -v --version\t print version and exit"
	"  -S --SINGLE\t use this if you want to start a user to user chat.\
	by default the chat_mode is set to MUC to allow to connect to a Multi Users Channel\n"
	,program_name);
	exit(exit_msg);
}
 
int main( int argc, char **argv)
{
	int next_option;
	/* A string listing the valid short options letters */
	const char *short_options = "s:P::l:p:r:hvS";
 
	/* An array listing valid long options */
	static const struct option long_options[]=
	{
		{"server",required_argument,NULL,'s'},
		{"port",optional_argument,NULL,'P'},
		{"login",required_argument,NULL,'l'},
		{"passwd",required_argument,NULL,'p'},
		{"recipient",required_argument,NULL,'r'},
		{"help",no_argument,NULL,'h'},
		{"version",no_argument,NULL,'v'},
		{"Single", no_argument,NULL,'S'},
		{NULL, 0, NULL, 0} /* End of array need by getopt_long do not delete it*/
	};
 
	/* You can connect to a serveur in 2 modes :
	 * SINGLE start a conversation with an other user already connected to the server
	 * MUC Multi Users Channel to connect to a chat room
	 */
	typedef enum chat_mode chat_mode;
	enum chat_mode
	{
		SINGLE,	MUC
	};
 
	char *server_name;
	int port;
	char *login_name;
	char *passwd;
	char *recipient;
 
	/* By default chat_mode is set to MUC since we want
	  to managed a chat room */
	chat_mode mode = MUC;
 
	/* Remember the program name to incorporate it in messages. */
	program_name = argv[0];
 
	do
	{
		next_option = getopt_long(argc, argv, short_options, long_options, NULL );
 
		switch(next_option)
		{
			case 's':
			server_name = optarg;
			printf("you will be connected to %s\n",server_name);
			break;
			case 'P':
			if (NULL != optarg)
			{
				port = atoi(optarg);
				printf("you be connected on %s on port %d\n",server_name,port);
			}
			break;
			case 'l':
			login_name = optarg;
			printf("your will be logged as %s\n",login_name);
			break;
			case 'p':
			passwd = optarg;
			printf("use %s as password\n",passwd);
			break;
			case 'r':
			recipient = optarg;
			printf("your messages will be sent to %s\n",recipient);
			break;
			case 'S':
			mode = SINGLE;
			printf("entering in SINGLE chat mode\n");
			break;
			case 'h':
			print_help(stdout, EXIT_SUCCESS);
			break;
			case 'v':
			print_versionInfo();
			break;
			case '?': /* An invalide option has been used,
			print help an exit with code EXIT_FAILURE */
			print_help(stderr, EXIT_FAILURE);
			break;
		}
	}
	while(next_option !=-1);
 
 
	if (optind < argc)
	{
		printf ("this arguments are not reconized: ");
		while (optind < argc)
		printf ("%s ", argv[optind++]);
		printf ("\n");
	}
 
	exit(EXIT_SUCCESS);
}