CODEWITHSUNDEEP
ccommand-linecommand-line-argumentsgetopt
Dave Challis
Dave Challis

Reputation: 3906

Handling command line options before and after an argument in C

So far I've been using getopt_long to parse options for a command line C program.

Is there a way to stop getopt_long parsing when it hits a non-option argument? If not, what's the best way to handle this in C?

To give an example, I'd like to handle commands in a similar way to git, and have general arguments before a command, and command-specific arguments after it:

git [general options] <command> [command options]

e.g.:

git --bare commit -a
git -p --bare status -s

-p and --bare are general options, and can be used with all commands, whereas -a is specific to the commit command, and -s specific to the status command.

Using getopt_long will try and parse all the options first, and then leave the non-option arguments to be handled. I'd ideally like to stop parsing once I hit a non-option (i.e. the command), and then pass the remaining arguments to a command-specific option parser.

Upvotes: 5

Views: 1035

Answers (1)

hmakholm left over Monica
hmakholm left over Monica

Reputation: 23342

The GNU Getopt manual says:

POSIX demands the following behavior: The first non-option stops option processing. This mode is selected by either setting the environment variable POSIXLY_CORRECT or beginning the options argument string with a plus sign (‘+’).

Upvotes: 7

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