* getopt_internal -- * Parse argc/argv argument vector. Called by user level routines. */

* Exchange the block from nonopt_start to nonopt_end with the block * from nonopt_end to opt_end (keeping the same order of arguments * in each bloc

* parse_long_options -- * Parse long options in argc/argv argument vector. * Returns -1 if short_too is set and the option does not match long_optio

* Compute the greatest common divisor of a and b. */