xref: /xsrc/external/mit/libX11/dist/src/ParseCmd.c

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/* 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, const 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)				\
    do {							\
    XrmStringToBindingQuarkList(				\
	options[i].specifier, start_bindings, start_quarks);    \
    XrmQPutStringResource(pdb, bindings, quarks, value_str);    \
    } while (0) /* 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 */
}