moo/lib/moo-opt.h

/*
 * $Id$
 *
    Copyright (c) 2014-2019 Chung, Hyung-Hwan. All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _MOO_OPT_H_
#define _MOO_OPT_H_

#include <moo-cmn.h>

/** \file
 * This file defines functions and data structures to process 
 * command-line arguments. 
 */

typedef struct moo_uopt_t moo_uopt_t;
typedef struct moo_uopt_lng_t moo_uopt_lng_t;

struct moo_uopt_lng_t
{
	const moo_uch_t* str;
	moo_uci_t        val;
};

struct moo_uopt_t
{
	/* input */
	const moo_uch_t* str; /* option string  */
	moo_uopt_lng_t*  lng; /* long options */

	/* output */
	moo_uci_t        opt; /* character checked for validity */
	moo_uch_t*       arg; /* argument associated with an option */

	/* output */
	const moo_uch_t* lngopt; 

	/* input + output */
	int              ind; /* index into parent argv vector */

	/* input + output - internal*/
	moo_uch_t*       cur;
};

typedef struct moo_bopt_t moo_bopt_t;
typedef struct moo_bopt_lng_t moo_bopt_lng_t;

struct moo_bopt_lng_t
{
	const moo_bch_t* str;
	moo_bci_t        val;
};

struct moo_bopt_t
{
	/* input */
	const moo_bch_t* str; /* option string  */
	moo_bopt_lng_t*  lng; /* long options */

	/* output */
	moo_bci_t        opt; /* character checked for validity */
	moo_bch_t*       arg; /* argument associated with an option */

	/* output */
	const moo_bch_t* lngopt; 

	/* input + output */
	int              ind; /* index into parent argv vector */

	/* input + output - internal*/
	moo_bch_t*       cur;
};

#if defined(__cplusplus)
extern "C" {
#endif

/**
 * The moo_getopt() function processes the \a argc command-line arguments
 * pointed to by \a argv as configured in \a opt. It can process two 
 * different option styles: a single character starting with '-', and a 
 * long name starting with '--'. 
 *
 * A character in \a opt.str is treated as a single character option. Should
 * it require a parameter, specify ':' after it.
 *
 * Two special returning option characters indicate special error conditions. 
 * - \b ? indicates a bad option stored in the \a opt->opt field.
 * - \b : indicates a bad parameter for an option stored in the \a opt->opt field.
 *
 * @return an option character on success, MOO_CHAR_EOF on no more options.
 */
MOO_EXPORT moo_uci_t moo_getuopt (
	int                argc, /* argument count */ 
	moo_uch_t* const*  argv, /* argument array */
	moo_uopt_t*        opt   /* option configuration */
);

MOO_EXPORT moo_bci_t moo_getbopt (
	int                argc, /* argument count */ 
	moo_bch_t* const*  argv, /* argument array */
	moo_bopt_t*        opt   /* option configuration */
);


#if defined(MOO_OOCH_IS_UCH)
#	define moo_opt_t moo_uopt_t
#	define moo_opt_lng_t moo_uopt_lng_t
#	define moo_getopt(argc,argv,opt) moo_getuopt(argc,argv,opt)
#else
#	define moo_opt_t moo_bopt_t
#	define moo_opt_lng_t moo_bopt_lng_t
#	define moo_getopt(argc,argv,opt) moo_getbopt(argc,argv,opt)
#endif

#if defined(__cplusplus)
}
#endif

#endif