/* $Xorg: ParseCmd.c,v 1.4 2001/02/09 02:03:35 xorgcvs Exp $ */

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

Copyright 1987, 1988, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
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in this Software without prior written authorization from The Open Group.


Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, 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 name of Digital not be
used in advertising or publicity pertaining to distribution of the
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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******************************************************************/
/* $XFree86: xc/lib/X11/ParseCmd.c,v 1.5 2001/12/14 19:54:03 dawes Exp $ */

/* 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.
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "Xlibint.h"
#include <X11/Xresource.h>
#include <stdio.h>


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

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)	     */
{
    int 		foundOption;
    char		**argsave;
    register int	i, myargc;
    XrmBinding		bindings[100];
    XrmQuark		quarks[100];
    XrmBinding		*start_bindings;
    XrmQuark		*start_quarks;
    char		*optP, *argP = NULL, optchar, argchar = 0;
    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 + (long) 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 */
}