/*
 * $Id$
 *
    Copyright (c) 2016-2020 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 _MIO_OPT_H_
#define _MIO_OPT_H_

#include "mio-cmn.h"

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

typedef struct mio_uopt_t mio_uopt_t;
typedef struct mio_uopt_lng_t mio_uopt_lng_t;

struct mio_uopt_lng_t
{
	const mio_uch_t* str;
	mio_uci_t        val;
};

struct mio_uopt_t
{
	/* input */
	const mio_uch_t* str; /* option string  */
	mio_uopt_lng_t*  lng; /* long options */

	/* output */
	mio_uci_t        opt; /* character checked for validity */
	mio_uch_t*       arg; /* argument associated with an option */

	/* output */
	const mio_uch_t* lngopt; 

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

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

typedef struct mio_bopt_t mio_bopt_t;
typedef struct mio_bopt_lng_t mio_bopt_lng_t;

struct mio_bopt_lng_t
{
	const mio_bch_t* str;
	mio_bci_t        val;
};

struct mio_bopt_t
{
	/* input */
	const mio_bch_t* str; /* option string  */
	mio_bopt_lng_t*  lng; /* long options */

	/* output */
	mio_bci_t        opt; /* character checked for validity */
	mio_bch_t*       arg; /* argument associated with an option */

	/* output */
	const mio_bch_t* lngopt; 

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

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

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

/**
 * The mio_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, MIO_CHAR_EOF on no more options.
 */
MIO_EXPORT mio_uci_t mio_getuopt (
	int                argc, /* argument count */ 
	mio_uch_t* const*  argv, /* argument array */
	mio_uopt_t*        opt   /* option configuration */
);

MIO_EXPORT mio_bci_t mio_getbopt (
	int                argc, /* argument count */ 
	mio_bch_t* const*  argv, /* argument array */
	mio_bopt_t*        opt   /* option configuration */
);


#if defined(MIO_OOCH_IS_UCH)
#	define mio_opt_t mio_uopt_t
#	define mio_opt_lng_t mio_uopt_lng_t
#	define mio_getopt(argc,argv,opt) mio_getuopt(argc,argv,opt)
#else
#	define mio_opt_t mio_bopt_t
#	define mio_opt_lng_t mio_bopt_lng_t
#	define mio_getopt(argc,argv,opt) mio_getbopt(argc,argv,opt)
#endif

#if defined(__cplusplus)
}
#endif

#endif