getopt_long - Definition More...

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "generic.h"
#include "getopt_long.h"

Include dependency graph for getopt_long.c:

Defines
#define	BADARG ':'
#define	BADCH '?'
#define	EEND -1
#define	EMSG ""
Functions
VL_EXPORT int	getopt_long (int argc, char const argv[], const char optstring, const struct option longopts, int longindex)
	Parse long options (BSD style)
Variables
char *	optarg
int	opterr = 1
int	optind = 1
int	optopt
int	optreset

Detailed Description

getopt_long - Definition

Author:: Andrea Vedaldi

Definition in file getopt_long.c.

Define Documentation

#define BADARG ':'

Definition at line 37 of file getopt_long.c.

#define BADCH '?'

Definition at line 36 of file getopt_long.c.

#define EEND -1

Definition at line 38 of file getopt_long.c.

#define EMSG ""

Definition at line 39 of file getopt_long.c.

Function Documentation

VL_EXPORT int getopt_long	(	int	argc,
		char *const	argv[],
		const char *	optstring,
		const struct option *	longopts,
		int *	longindex
	)

Parse long options (BSD style)

Parameters:

argc	number of arguments.
argv	pointer to the vector of arguments.
optstring	list of abbreviated options
longopts	list of long options.
longindex	index of current option in longopts.

Returns:: the code of the next option.

This function extract long and short options from the argument list argv of argc entries.

A short options sequence is introduced by a single dash character -. Each short option is described by a single character in the string optstring, possibly followed by a : character to denote a (mandatory) argument of the short option. A short option with an argument cannot appear in the middle of a short option sequence, but only at the end.

A long option is introduced by a double dash --. Each long option is described by an instance of the option structure in the longopts table (the last entry must be filled with zeroes to denote the end).

Illegal options and missing arguments cause the function to skip the option and return '?'. If opterr is true (default), the function prints an error message to stderr. Finally, if optstring has a leading :, then error messages are suppressed and a missing argument causes : to be returned.