/*
 * $XConsortium: ParseCmd.c,v 1.24 91/05/08 09:48:53 gildea Exp $
 */

/***********************************************************
Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts,
and the Massachusetts Institute of Technology, Cambridge, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the names of Digital or MIT not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

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

/* XrmParseCommand()

   Parse command line and store argument values into resource database

   Allows any un-ambiguous abbreviation for an option name, but requires
   that the table be ordered with any options that are prefixes of
   other options appearing before the longer version in the table.
*/

#include "Xlibint.h"
#include <X11/Xresource.h>
#include <stdio.h>


static void _XReportParseError(arg, msg)
    XrmOptionDescRec *arg;
    char *msg;
{
    (void) fprintf(stderr, "Error parsing argument \"%s\" (%s); %s\n",
		   arg->option, arg->specifier, msg);
    exit(1);
}

#if NeedFunctionPrototypes
void XrmParseCommand(
    XrmDatabase		*pdb,		/* data base */
    register XrmOptionDescList options, /* pointer to table of valid options */
    int			num_options,	/* number of options		     */
    _Xconst char	*prefix,	/* name to prefix resources with     */
    int			*argc,		/* address of argument count 	     */
    char		**argv)		/* argument list (command line)	     */
#else
void XrmParseCommand(pdb, options, num_options, prefix, argc, argv)
    XrmDatabase		*pdb;		/* data base */
    register XrmOptionDescList options; /* pointer to table of valid options */
    int			num_options;	/* number of options		     */
    char		*prefix;	/* name to prefix resources with     */
    int			*argc;		/* address of argument count 	     */
    char		**argv;		/* argument list (command line)	     */
#endif
{
    int 		foundOption;
    char		**argsave;
    register int	i, myargc;
    XrmBinding		bindings[100];
    XrmQuark		quarks[100];
    XrmBinding		*start_bindings;
    XrmQuark		*start_quarks;
    char		*optP, *argP, optchar, argchar;
    int			matches;
    enum {DontCare, Check, NotSorted, Sorted} table_is_sorted;
    char		**argend;

#define PutCommandResource(value_str)				\
    {								\
    XrmStringToBindingQuarkList(				\
	options[i].specifier, start_bindings, start_quarks);    \
    XrmQPutStringResource(pdb, bindings, quarks, value_str);    \
    } /* PutCommandResource */

    myargc = (*argc); 
    argend = argv + myargc;
    argsave = ++argv;

    /* Initialize bindings/quark list with prefix (typically app name). */
    quarks[0] = XrmStringToName(prefix);
    bindings[0] = XrmBindTightly;
    start_quarks = quarks+1;
    start_bindings = bindings+1;

    table_is_sorted = (myargc > 2) ? Check : DontCare;
    for (--myargc; myargc > 0; --myargc, ++argv) {
	foundOption = False;
	matches = 0;
	for (i=0; i < num_options; ++i) {
	    /* checking the sort order first insures we don't have to
	       re-do the check if the arg hits on the last entry in
	       the table.  Useful because usually '=' is the last entry
	       and users frequently specify geometry early in the command */
	    if (table_is_sorted == Check && i > 0 &&
		strcmp(options[i].option, options[i-1].option) < 0) {
		table_is_sorted = NotSorted;
	    }
	    for (argP = *argv, optP = options[i].option;
		 (optchar = *optP++) &&
		 (argchar = *argP++) &&
		 argchar == optchar;);
	    if (!optchar) {
		if (!*argP ||
		    options[i].argKind == XrmoptionStickyArg ||
		    options[i].argKind == XrmoptionIsArg) {
		    /* give preference to exact matches, StickyArg and IsArg */
		    matches = 1;
		    foundOption = i;
		    break;
		}
	    }
	    else if (!argchar) {
		/* may be an abbreviation for this option */
		matches++;
		foundOption = i;
	    }
	    else if (table_is_sorted == Sorted && optchar > argchar) {
		break;
	    }
	    if (table_is_sorted == Check && i > 0 &&
		strcmp(options[i].option, options[i-1].option) < 0) {
		table_is_sorted = NotSorted;
	    }
	}
	if (table_is_sorted == Check && i >= (num_options-1))
	    table_is_sorted = Sorted;
	if (matches == 1) {
		i = foundOption;
		switch (options[i].argKind){
		case XrmoptionNoArg:
		    --(*argc);
		    PutCommandResource(options[i].value);
		    break;
			    
		case XrmoptionIsArg:
		    --(*argc);
		    PutCommandResource(*argv);
		    break;

		case XrmoptionStickyArg:
		    --(*argc);
		    PutCommandResource(argP);
		    break;

		case XrmoptionSepArg:
		    if (myargc > 1) {
			++argv; --myargc; --(*argc); --(*argc);
			PutCommandResource(*argv);
		    } else
			(*argsave++) = (*argv);
		    break;
		
		case XrmoptionResArg:
		    if (myargc > 1) {
			++argv; --myargc; --(*argc); --(*argc);
			XrmPutLineResource(pdb, *argv);
		    } else
			(*argsave++) = (*argv);
		    break;
		
		case XrmoptionSkipArg:
		    if (myargc > 1) {
			--myargc;
			(*argsave++) = (*argv++);
		    }
		    (*argsave++) = (*argv); 
		    break;

		case XrmoptionSkipLine:
		    for (; myargc > 0; myargc--)
			(*argsave++) = (*argv++);
		    break;

		case XrmoptionSkipNArgs:
		    {
			register int j = 1 + (int) options[i].value;

			if (j > myargc) j = myargc;
			for (; j > 0; j--) {
			    (*argsave++) = (*argv++);
			    myargc--;
			}
			argv--;		/* went one too far before */
			myargc++;
		    }
		    break;

		default:
		    _XReportParseError (&options[i], "unknown kind");
		    break;
		}
	}
	else
	    (*argsave++) = (*argv);  /*compress arglist*/ 
    }

    if (argsave < argend)
	(*argsave)=NULL; /* put NULL terminator on compressed argv */
}
