/*
 main.c
 
    Copyright (C) 2004 Jeremy Zurcher
 
    This is a 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 libdaemon; if not, write to the Free Software Foundation,
    Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "main.h"

static char *prog_name = NULL;

static void usage(void)
{
	fprintf(stderr,"\n/*\n *\t=> %s <= version "VERSION", "COPYRIGHT"\n *\n",prog_name);
	fprintf(stderr," *\t\tThis program is a free software; you can redistribute it and/or modify\n");
	fprintf(stderr," *\t\tit under the terms of the GNU General Public License as published by\n");
	fprintf(stderr," *\t\tthe Free Software Foundation; either version 2 of the License, or\n");
	fprintf(stderr," *\t\t(at your option) any later version.\n *\n");
	fprintf(stderr," *\t\tThis program is distributed in the hope that it will be useful,\n");
	fprintf(stderr," *\t\tbut WITHOUT ANY WARRANTY; without even the implied warranty of\n");
	fprintf(stderr," *\t\tMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n");
	fprintf(stderr," *\t\tGNU General Public License for more details.\n"); 
	fprintf(stderr," */\n\n");
	
	fprintf(stderr,"usage : %s [-v] [ -a argument ]\n",prog_name);
	fprintf(stderr,"\t\t--version      :  print version\n");
	fprintf(stderr,"\t\t--help         :  print this screen\n");
	fprintf(stderr,"\t\t-v             :  verbose mode\n");
	fprintf(stderr,"\t\t-a             :  an argument\n");
	exit(EXIT_FAILURE);
}

static void version()
{
	fprintf(stderr,"%s version "VERSION", "COPYRIGHT"\n",prog_name);
	exit(EXIT_FAILURE);
}

static void argv_err(int i, char *opt, char *arg)
{
	if(i<0) fprintf(stderr,"%s : unknown option -%s.\n",prog_name,opt);
	else if(i==0) fprintf(stderr,"%s : -%s option, argument is mandatory.\n",prog_name,opt);
	else fprintf(stderr,"%s : -%s option, wrong argument %s.\n",prog_name,opt,arg);
	exit(EXIT_FAILURE);
}

int main(int argc, char **argv)
{
	int verbose = 0;
	char *arg = NULL;
	
	char *tmp = NULL;
	
	/* eat progname */
	prog_name = basename(*argv);
	++argv;
	--argc;
	while(argc){
		tmp = *argv;
		if(*tmp=='-'){
			tmp++;
			if(*tmp=='-'){
				/* long options  */
				tmp++;
				if(!strncmp(tmp,"help",5)) usage();
				else if(!strncmp(tmp,"version",8)) version();
				else argv_err(-1,tmp-1,NULL);
			}
			/* short otions */
			else if(*tmp=='v') {
				verbose = 1;
			}
			else if(*tmp=='a') {
				if(!--argc) argv_err(0,"a",NULL);	/* need argument */
				arg = *++argv;
			}
			else {
				argv_err(-1,*argv,NULL);		/* unknown option */
			}
		}
		else {
			/* no (more) options */
			break;
		}
		argc--;
		argv++;
	}

	printf("-v       : %d\n",verbose);
	printf("-a       : %s\n",arg);
	
	while(argc--) printf("argument : %s\n",*argv++);
	
	exit(EXIT_SUCCESS);
}