Subversion Repositories tendra.SVN

/*

    		 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

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

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

 *

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

 *

 **** Commentary:

 *

 * This file implements the command line argument parsing routines specified

 * in "arg-parse.h".  See that file for more details.

 *

 **** Change Log:

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

 * Revision 1.1.1.1  1998/01/17  15:57:43  release

 * First version to be checked into rolling release.

 *

 * Revision 1.3  1994/12/12  11:44:26  smf

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

 * OSSG C Coding Standards.

 *

 * Revision 1.2  1994/08/22  09:36:39  smf

 * Fixed bug DR114:ids-too-long.

 *

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

 * Initial import of library shared files.

 *

**/

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

#include "arg-parse.h"

#include "gen-errors.h"

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

void

arg_parse_intern_descriptions PROTO_N ((arg_list))

			      PROTO_T (ArgListP arg_list)

{

    while ((arg_list->name != NIL (CStringP)) ||

	   (arg_list->short_name != '\0')) {

	EStringP estring = error_lookup_string (arg_list->u.name);

	ASSERT (estring != NIL (EStringP));

	arg_list->u.message = estring;

	arg_list ++;

    }

}

int

arg_parse_arguments PROTO_N ((arg_list, usage, argc, argv))

		    PROTO_T (ArgListP arg_list X

			     EStringP usage X

			     int      argc X

			     char   **argv)

{

    int       tmp_argc = argc;

    char    **tmp_argv = argv;

    ArgUsageT closure;

    closure.usage    = error_string_contents (usage);

    closure.arg_list = arg_list;

    while (tmp_argc) {

	CStringP option = (tmp_argv [0]);

	char     c      = (option [0]);

	if ((((c == '-') && (option [1] == '-')) ||

	     ((c == '+') && (option [1] == '+'))) && (option [2] == '\0')) {

	    return (argc - tmp_argc + 1);

	} else if (((c == '-') && (option [1] == '-')) ||

		   ((c == '+') && (option [1] == '+'))) {

	    ArgListP tmp_list  = arg_list;

	    ArgListP chosen    = NIL (ArgListP);

	    unsigned matches   = 0;

	    CStringP immediate = NIL (CStringP);

	    while ((tmp_list->name != NIL (CStringP)) ||

		   (tmp_list->short_name != '\0')) {

		CStringP opt = (tmp_list->name);

		CStringP arg = (&(option [2]));

		if (opt != NIL (CStringP)) {

		    char optch;

		    char argch;

		    do {

			optch = (*opt ++);

			argch = (*arg ++);

		    } while (optch && argch && (optch == argch));

		    if (optch == argch) {

			chosen    = tmp_list;

			matches   = 1;

			immediate = (arg - 1);

			break;

		    } else if ((optch == '\0') &&

			       (((tmp_list->type) == AT_IMMEDIATE) ||

				((tmp_list->type) == AT_EITHER))) {

			chosen    = tmp_list;

			matches   = 1;

			immediate = (arg - 1);

			break;

		    } else if (argch == '\0') {

			chosen = tmp_list;

			matches ++;

		    }

		}

		tmp_list ++;

	    }

	    if (matches == 0) {

		E_arg_parse_unknown_option (option, &closure);

		UNREACHED;

	    } else if (matches > 1) {

		E_arg_parse_ambiguous_option (option, &closure);

		UNREACHED;

	    } else {

		switch (chosen->type) EXHAUSTIVE {

		  case AT_SWITCH:

		    (*((BoolP) (chosen->closure))) = (c == '-');

		    break;

		  case AT_NEG_SWITCH:

		    (*((BoolP) (chosen->closure))) = (c == '+');

		    break;

		  case AT_PROC_SWITCH:

		    (*(chosen->proc)) (option, &closure, chosen->closure,

				       c == '-');

		    break;

		  case AT_IMMEDIATE:

		    if (immediate != NIL (CStringP)) {

			(*(chosen->proc)) (option, &closure, chosen->closure,

					   immediate);

		    } else {

			E_arg_parse_unknown_option (option, &closure);

			UNREACHED;

		    }

		    break;

		  case AT_EITHER:

		    if (immediate != NIL (CStringP)) {

			if (immediate [0] != '\0') {

			    (*(chosen->proc)) (option, &closure,

					       chosen->closure, immediate);

			} else if (tmp_argc > 1) {

			    tmp_argv ++;

			    tmp_argc --;

			    (*(chosen->proc)) (option, &closure,

					       chosen->closure, tmp_argv [0]);

			} else {

			    E_arg_parse_missing_argument (option, &closure);

			    UNREACHED;

			}

		    } else {

			E_arg_parse_unknown_option (option, &closure);

			UNREACHED;

		    }

		    break;

		  case AT_FOLLOWING:

		    if (tmp_argc > 1) {

			tmp_argv ++;

			tmp_argc --;

			(*(chosen->proc)) (option, &closure, chosen->closure,

					   tmp_argv [0]);

		    } else {

			E_arg_parse_missing_argument (option, &closure);

			UNREACHED;

		    }

		    break;

		  case AT_EMPTY:

		    (*(chosen->proc)) (option, &closure, chosen->closure);

		    break;

		  case AT_FOLLOWING2:

		    if (tmp_argc > 2) {

			tmp_argv += 2;

			tmp_argc -= 2;

			(*(chosen->proc)) (option, &closure, chosen->closure,

					   tmp_argv [-1], tmp_argv [0]);

		    } else {

			E_arg_parse_missing_argument (option, &closure);

			UNREACHED;

		    }

		    break;

		  case AT_FOLLOWING3:

		    if (tmp_argc > 3) {

			tmp_argv += 3;

			tmp_argc -= 3;

			(*(chosen->proc)) (option, &closure, chosen->closure,

					   tmp_argv [-2], tmp_argv [-1],

					   tmp_argv [0]);

		    } else {

			E_arg_parse_missing_argument (option, &closure);

			UNREACHED;

		    }

		    break;

		}

	    }

	} else if (((c == '-') && (option [1] == '+')) ||

		   ((c == '+') && (option [1] == '-')) ||

		   ((c == '-') && (option [1] == '\0')) ||

		   ((c == '+') && (option [1] == '\0'))) {

	    E_arg_parse_unknown_option (option, &closure);

	    UNREACHED;

	} else if ((c == '-') || (c == '+')) {

	    CStringP opt = &(option [1]);

	    while ((opt != NIL (CStringP)) && (*opt != '\0')) {

		ArgListP tmp_list = arg_list;

		ArgListP chosen   = NIL (ArgListP);

		while ((tmp_list->name != NIL (CStringP)) ||

		       (tmp_list->short_name != '\0')) {

		    if (tmp_list->short_name == *opt) {

			chosen = tmp_list;

			break;

		    }

		    tmp_list ++;

		}

		if (chosen) {

		    switch (chosen->type) EXHAUSTIVE {

		      case AT_SWITCH:

			(*((BoolP) (chosen->closure))) = (c == '-');

			break;

		      case AT_NEG_SWITCH:

			(*((BoolP) (chosen->closure))) = (c == '+');

			break;

		      case AT_PROC_SWITCH:

			(*(chosen->proc)) (opt, &closure, chosen->closure,

					   c == '-');

			break;

		      case AT_IMMEDIATE:

			(*(chosen->proc)) (opt, &closure, chosen->closure,

					   opt + 1);

			opt = NIL (CStringP);

			break;

		      case AT_EITHER:

			if (opt [1] != '\0') {

			    (*(chosen->proc)) (opt, &closure, chosen->closure,

					       opt + 1);

			} else if (tmp_argc > 1) {

			    tmp_argv ++;

			    tmp_argc --;

			    (*(chosen->proc)) (opt, &closure, chosen->closure,

					       tmp_argv [0]);

			} else {

			    E_arg_parse_missing_short_arg (option, opt,

							   &closure);

			    UNREACHED;

			}

			opt = NIL (CStringP);

			break;

		      case AT_FOLLOWING:

			if (tmp_argc > 1) {

			    tmp_argv ++;

			    tmp_argc --;

			    (*(chosen->proc)) (opt, &closure, chosen->closure,

					       tmp_argv [0]);

			} else {

			    E_arg_parse_missing_short_arg (option, opt,

							   &closure);

			    UNREACHED;

			}

			break;

		      case AT_EMPTY:

			(*(chosen->proc)) (opt, &closure, chosen->closure);

			break;

		      case AT_FOLLOWING2:

			if (tmp_argc > 2) {

			    tmp_argv += 2;

			    tmp_argc -= 2;

			    (*(chosen->proc)) (opt, &closure, chosen->closure,

					       tmp_argv [-1], tmp_argv [0]);

			} else {

			    E_arg_parse_missing_short_arg (option, opt,

							   &closure);

			    UNREACHED;

			}

			break;

		      case AT_FOLLOWING3:

			if (tmp_argc > 3) {

			    tmp_argv += 3;

			    tmp_argc -= 3;

			    (*(chosen->proc)) (opt, &closure, chosen->closure,

					       tmp_argv [-2], tmp_argv [-1],

					       tmp_argv [0]);

			} else {

			    E_arg_parse_missing_short_arg (option, opt,

							   &closure);

			    UNREACHED;

			}

			break;

		    }

		} else {

		    E_arg_parse_unknown_short_opt (option, opt, &closure);

		    UNREACHED;

		}

		if (opt) {

		    opt ++;

		}

	    }

	} else {

	    return (argc - tmp_argc);

	}

	tmp_argv ++;

	tmp_argc --;

    }

    return (argc);

}

void

write_arg_usage PROTO_N ((ostream, closure))

		PROTO_T (OStreamP  ostream X

			 ArgUsageP closure)

{

    CStringP usage    = (closure->usage);

    ArgListP arg_list = (closure->arg_list);

    write_cstring (ostream, usage);

    while ((arg_list->name != NIL (CStringP)) ||

	   (arg_list->short_name != '\0')) {

	CStringP desc = error_string_contents (arg_list->u.message);

	if (arg_list->name) {

	    write_newline (ostream);

	    write_cstring (ostream, "    {--|++}");

	    write_cstring (ostream, arg_list->name);

	    write_cstring (ostream, desc);

	}

	if (arg_list->short_name != '\0') {

	    write_newline (ostream);

	    write_cstring (ostream, "    {-|+}");

	    write_char (ostream, arg_list->short_name);

	    write_cstring (ostream, desc);

	}

	arg_list ++;

    }

}

/*

 * Local variables(smf):

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

 * end:

**/