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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

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        reproduced upon any copies or amended versions of it;

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        no liability whatsoever in relation to any use to which

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*/

/**** arg-parse.h --- Command line argument parsing.

 *

 ** Author: Steve Folkes <smf@hermes.mod.uk>

 *

 **** Commentary:

 *

 ***=== INTRODUCTION =========================================================

 *

 * This file specifies the interface to a command line argument parsing

 * facility.  The facility has a standard behaviour, making it easier to have

 * a standard command line argument format.  The facility only parses command

 * line options, which it assumes precede the other arguments.  All options

 * must begin with an option character (either '+' or '-').  The facility

 * supports short (single character) options (should begin with '-' or '+')

 * and long (multiple character) options (should begin with '--' or '++').

 * Any arguments that begins with another character will terminate the parsing

 * without error (so that the program can deal with the remaining arguments).

 * In addition, the option '--' (or '++') will terminate the parse, so that a

 * user may specify non option arguments that begin with an option character.

 *

 * The parsing routines support a number of different option types, and deal

 * with shortest prefixes for non immediate options (an immediate option is

 * one where the data associated with it is part of the option string, and not

 * in a following word).

 *

 ***=== TYPES ================================================================

 *

 ** Type:	ArgTypeT

 ** Type:	ArgTypeP

 ** Repr:	enum {AT_SWITCH, AT_NEG_SWITCH, AT_PROC_SWITCH, AT_IMMEDIATE,

 *		      AT_EITHER, AT_FOLLOWING, AT_EMPTY, AT_FOLLOWING2}

 *

 * This is the type of the an option.  The constants have the following

 * meanings:

 *

 *	AT_SWITCH

 *

 * This is the type of a switch option.  The procedure value should be null.

 * The closure should be a pointer to a boolean.  If the option character is a

 * '-' then the boolean is set.  If the option character is '+' then the

 * boolean is reset.

 *

 *	AT_NEG_SWITCH

 *

 * This is the type of a negated switch option. The procedure value should be

 * null. The closure should be a pointer to a boolean.  If the option

 * character is a '-' then the boolean is reset.  If the option character is

 * '+' then the boolean is set.

 *

 *	AT_PROC_SWITCH

 *

 * This is the type of a switch option that needs some extra work to be

 * performed.  The procedure will be called with the option that was selected,

 * the error closure, the option closure, and a boolean (true if the option

 * character is '-', false otherwise).

 *

 *	AT_IMMEDIATE

 *

 * This is the type of an option with one immediate argument.  No shortest

 * prefix matching will be used for immediate arguments.  The procedure will

 * be called with the option that was selected, the error closure, the option

 * closure, and the argument to the option.  This type of argument should

 * appear at the end of the argument list that is passed to the

 * ``arg_parse_arguments'' function, as it may cause problems with shortest

 * prefix matching otherwise.

 *

 *	AT_EITHER

 *

 * This is the type of an option with one argument. If an immediate argument

 * exists, then that is used.  If no immediate argument exists, then the

 * following argument is used.  No shortest prefix matching will be used for

 * either arguments.  The procedure will be called with the option that was

 * selected, the error closure, the option closure, and the argument to the

 * option.  This type of argument should appear at the end of the argument

 * list that is passed to the ``arg_parse_arguments'' function, as it may

 * cause problems with shortest prefix matching otherwise.

 *

 *	AT_FOLLOWING

 *

 * This is the type of an option with one following argument.  The procedure

 * will be called with the option that was selected, the error closure, the

 * option closure, and the argument to the option.

 *

 *	AT_EMPTY

 *

 * This is the type of an option with no argument.  The procedure will be

 * called with the option that was selected, the error closure, and the option

 * closure.

 *

 *	AT_FOLLOWING2

 *

 * This is the type of an option with two following arguments.  The procedure

 * will be called with the option that was selected, the error closure, the

 * option closure, and the arguments to the option.

 *

 *	AT_FOLLOWING3

 *

 * This is the type of an option with three following arguments.  The

 * procedure will be called with the option that was selected, the error

 * closure, the option closure, and the arguments to the option.

 *

 * Note that if a matched option is a short option, then the current position

 * is passed to the option handling procedure as the option name.  For long

 * options, the entire option string is passed.  If the handler is interested

 * in the option name, it should check the start of this string: if it is '-'

 * or '+' it should be a long option; otherwise it should be a short option.

 *

 ** Type:	ArgProcP

 ** Repr:	void (*) (CStringP, ArgUsageP, GenericP, ...)

 *

 * This is the type of a procedure to be called to parse a complex option.

 * Because of union initialisation problems, the latter arguments of this

 * function are untyped.

 *

 ** Type:	ArgListT

 ** Type:	ArgListP

 ** Repr:	<private>

 *

 * This is the type of an entry in an option list.  A vector of such entries

 * should be passed to the ``arg_parse_arguments'' function, with the last

 * entry being the ``ARG_PARSE_END_LIST'' macro.  Each entry has the following

 * fields: a name field (the name of the option without the leading '--' or

 * '++'), a short name field (a character), a type field (the type of the

 * option), a procedure field (the procedure to handle the option), a closure

 * field (a pointer to some arbritary data used by the procedure), and a

 * description field (the name of a named string that describes how the option

 * is used - see the file "error.h" for more information on named strings).

 * The description field should be surrounded by the ``UB'' and ``UE'' macros

 * for union initialisation.  The named strings used in the description fields

 * should themselves be interned before the ``arg_parse_arguments'' function

 * is called.  A typical argument list definition would be something like the

 * following:

 *

 *	static ArgListT arg_list [] = {

 *	    {

 *		"option name", 'o', AT_PROC_SWITCH, (ArgProcP) arg_proc,

 *		NIL (GenericP),

 *		UB "option description name" UE

 *	    }, ARG_PARSE_END_LIST

 *	};

 *

 * If an option has only a short form, then the name should be NIL (CStringP);

 * if it has only a long form, then the character should be '\0'.  It is

 * illegal for an option to have neither a long form or a short form.

 *

 ** Type:	ArgUsageT

 ** Type:	ArgUsageP

 ** Repr:	struct {CStringP usage; ArgListP arg_list;}

 *

 * This is the type of argument to be passed to ``write_arg_usage''.

 *

 ***=== FUNCTIONS ============================================================

 *

 ** Function:	void			arg_parse_intern_descriptions

 *			(ArgListP arg_list)

 ** Exceptions:	XX_dalloc_no_memory, XX_error_redefined_string

 *

 * This function should be called on all option lists that the program uses,

 * before they are passed to ``arg_parse_arguments''.  It replaces the

 * descrption name with the named string it represents.  It should only be

 * called once on each list.  The named strings used should be interned before

 * this function is called.

 *

 ** Function:	int arg_parse_arguments(ArgListP arg_list, EStringP usage,

 *					int argc, char **argv)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function does the argument parsing.  The arg_list argument should

 * specify the valid options for the program.  The usage estring should be a

 * named string, whose content is a summary of the program's usage.  The argc

 * and argv arguments should specify the actual arguments passed to the

 * program.  The parsing starts from the first argument, so the first element

 * of the program's argument list (the program name) should not be passed to

 * this function.  The function returns the number of elements of the list

 * that it parsed.

 *

 ** Function:	void write_arg_usage(OStreamP ostream, ArgUsageP closure)

 ** Exceptions:	XX_dalloc_no_memory, XX_ostream_write_error

 *

 * This function can be used to write out a usage message based upon the usage

 * information supplied.

 *

 ***=== MACROS ===============================================================

 *

 ** Macro:	ARG_PARSE_END_LIST

 ** Exceptions:

 *

 * This macro should be used to terminate an option list.

 *

 **** Change Log:

 * $Log: arg-parse.h,v $

 * Revision 1.1.1.1  1998/01/17  15:57:17  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/12  11:44:28  smf

 * Performing changes for 'CR94_178.sid+tld-update' - bringing in line with

 * OSSG C Coding Standards.

 *

 * Revision 1.1.1.1  1994/07/25  16:05:47  smf

 * Initial import of library shared files.

 *

**/

/****************************************************************************/

#ifndef H_ARG_PARSE

#define H_ARG_PARSE

#include "os-interface.h"

#include "cstring.h"

#include "error.h"

#include "ostream.h"

/*--------------------------------------------------------------------------*/

#ifdef FS_NO_ENUM

typedef int ArgTypeT, *ArgTypeP;

#define AT_SWITCH	(0)

#define AT_NEG_SWITCH	(1)

#define AT_PROC_SWITCH	(2)

#define AT_IMMEDIATE	(3)

#define AT_EITHER	(4)

#define AT_FOLLOWING	(5)

#define AT_EMPTY	(6)

#define AT_FOLLOWING2	(7)

#define AT_FOLLOWING3	(8)

#else

typedef enum {

    AT_SWITCH,

    AT_NEG_SWITCH,

    AT_PROC_SWITCH,

    AT_IMMEDIATE,

    AT_EITHER,

    AT_FOLLOWING,

    AT_EMPTY,

    AT_FOLLOWING2,

    AT_FOLLOWING3

} ArgTypeT, *ArgTypeP;

#endif /* defined (FS_NO_ENUM) */

struct ArgListT;

typedef struct ArgUsageT {

    CStringP			usage;

    struct ArgListT	       *arg_list;

} ArgUsageT, *ArgUsageP;

typedef void(*ArgProcP)(CStringP, ArgUsageP, GenericP, ...);

typedef struct ArgListT {

    CStringP			name;

    char			short_name;

    ArgTypeT			type;

    ArgProcP			proc;

    GenericP			closure;

    UNION {

	CStringP		name;

	EStringP		message;

    } u;

} ArgListT, *ArgListP;

/*--------------------------------------------------------------------------*/

extern void			arg_parse_intern_descriptions

(ArgListP);

extern int			arg_parse_arguments

(ArgListP, EStringP, int, char **);

extern void			write_arg_usage

(OStreamP, ArgUsageP);

/*--------------------------------------------------------------------------*/

#define ARG_PARSE_END_LIST \

{NIL(CStringP), '\0',(ArgTypeT)0, NIL(ArgProcP), NIL(GenericP), \

 UB NIL(CStringP)UE}

#endif /* !defined (H_ARG_PARSE) */

/*

 * Local variables(smf):

 * eval: (include::add-path-entry "../os-interface" "../generated")

 * end:

**/