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Adding another option to getopt

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# 1  
Old 06-13-2013
Adding another option to getopt
I am trying to code for the addition of a new argument to the command line, the option D to a code that already has ABC (below). When I use make to compile it, it displays: invalid option --D. I did define the global d variable, as well as initialized it inside the main function of the C code. I don't know what else to try. Is there some trick to add additional arguments to getopt?

Code:
while ((op = getopt(argc, argv, "A:B:C:D")) != EOF) 
                switch (op) {
                	case    'A':    a = atoi(optarg); 
                                         break;
                        case    'B':    b= atof(optarg);
                                        break;
                        case    'C':    c= atof(optarg);
					break; //why break???
                        case    'D':    d = atoi(optarg);
					break;
                      default:  instruct();
                }

Thank you!
Last edited by Scott; 06-13-2013 at 06:42 PM.. Reason: Please use code tags
# 2  
Old 06-13-2013
You need a colon following the D in your optstring, if it is supposed to take an value (i.e. -D7 ) and not just be a flag (eg -D):

Code:
getopt(argc, argv, "A:B:C:D:")

btw break ends the case statement, if you don't have a break execution falls into the following case statement.
This User Gave Thanks to Chubler_XL For This Post:
Alabama
# 3  
Old 06-14-2013
Thank you, my bad. I added the ":" after D, but it still displays "invalid option". It should not be a problem with changing argc, right? The next part is this. Not sure if something else is happening to optind.

Code:
if ((argc - optind) != 1) {
                instruct();
        }

	strcpy(file_name, argv[optind])

# 4  
Old 06-14-2013
What OS are you using?

Exactly what is the command line that this code is parsing?

Is there any code in your script that modifies argc, argv, or any of the strings pointed to by argv[0] through argv[argc - 1] before you get to the code shown in your first post in this thread? (If at all possible, show us all of the code between your entry into main() and the while getopt() loop.)

Please show us the exact error message that you're getting from getopt (in CODE tags).
This User Gave Thanks to Don Cragun For This Post:
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# 5  
Old 06-14-2013
I am using Mac OS X.

Eventually I want to add all ABCD cases, but for now I am giving it just -D1 to parse.

There are no such operations, below is all the code starting from main until the while op=getopt loop. The instruct function prints instructions for the ABC cases, but not the added part for case D.
I am using the make compiler on this code together with 2 other programs, and giving the command line -D1 to the resulting file.
Code:
main(argc, argv)
	int	argc;
	char	**argv;
{
	FILE 	*fopen(), *ifp, *ofp;
	int	a=a0, d=d0;//a0 and d0 defined above
	float	b=b0, c=c0;//b0 and c0 defined above
	char	in_file[256], out_file[256];
	void instruct();
	if (argc == 1) 
		instruct();

The error message is:
Code:
invalid option -- 'D'

Thank you!
# 6  
Old 06-14-2013
Did you try ?

Code:
getopt(argc, argv, "ABCD:")

This User Gave Thanks to rajamadhavan For This Post:
Alabama
# 7  
Old 06-14-2013
Thank you, just did, but still getting "invalid option --D".
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