Thread: getopt() problems.......

Hi there....
I'm trying to become more framiliar with structured programming. I have a problem with an encryption program I'm creating.....
I'm allowing command line arguments to be passed to main(), and using getopt() to allow the dash(-) option and argument following the option...
I'm about 1/4 of the way finished, it compiles fine, but when I run it, I can not specify arguments with correct results... If you could, if it's not too much of a hasle, please compile/download attatchment....
Thanks in advance.
Here is my code so far:

Code:

#include <stdio.h>
#include <unistd.h>

FILE *in;

char usage(char *name); 
char infile(char *arg1);

main(int argc, char *argv[]) {

	char c;


	if (argc < 4) {
		usage(argv[0]);
		return (1);
	}

	
	while((c = getopt(argc, argv, "i:o:k:")) != EOF) {

	switch (c) {

		case ('i') : infile(argv[1]);
				break;
	}
		 
	
		
	}
	

}

char usage(char *name) {

	printf("Usage:\t%s -i [infile] -o [outfile] -k [key]\n", name);
	return;
}

char infile(char *arg1) {

	if ((in = fopen(arg1, "r")) == NULL) {
		printf("There was an error opening \"%s\"\n", arg1);
		exit(1);
	
	}

}

I've never used getopt(), and it's not standard.

The way I get the command-line arguments is simply:

Code:

int parm = 1;
while (parm < argc)
{
    if (argv[parm][0] == '-') 
    {           // it's a switch
        switch (toupper(argv[parm][1]))
        {
            case 'I':        // input switch?
                break;
            case 'O':        // output switch?
                break;
        }
    }
    else
    {           // it's not a switch
     /* do something else */
    }
    parm++;     // next parameter
}

Code:

case ('i') : infile(optarg);