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

Copyright (c) 1987, 1988  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.


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
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.

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

/*
 * $XConsortium: xrefresh.c,v 1.14 94/04/17 20:24:48 rws Exp $
 * $XFree86: xc/programs/xrefresh/xrefresh.c,v 3.1 1996/06/10 10:02:46 dawes Exp $
 *
 * Kitchen sink version, useful for clearing small areas and flashing the 
 * screen.
 */

#include <stdio.h>
#include <errno.h>
#include <X11/Xos.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <ctype.h>

#ifdef X_NOT_STDC_ENV
char *malloc();
#else
#include <stdlib.h>
#endif

Window win;

char *ProgramName;

void Syntax ()
{
    fprintf (stderr, "usage:  %s [-options] [geometry] [display]\n\n", 
    	     ProgramName);
    fprintf (stderr, "where the available options are:\n");
    fprintf (stderr, "    -display host:dpy       or -d\n");
    fprintf (stderr, "    -geometry WxH+X+Y       or -g spec\n");
    fprintf (stderr, "    -black                  use BlackPixel\n");
    fprintf (stderr, "    -white                  use WhitePixel\n");
    fprintf (stderr, "    -solid colorname        use the color indicated\n");
    fprintf (stderr, "    -root                   use the root background\n");
    fprintf (stderr, "    -none                   no background in window\n");
    fprintf (stderr, "\nThe default is:  %s -none\n\n", ProgramName);
    exit (1);
}

static char *copystring (s)
    register char *s;
{
    int len = (s ? strlen (s) : 0) + 1;
    char *retval;

    retval = malloc (len);
    if (!retval) {
	fprintf (stderr, "%s:  unable to allocate %d bytes for string.\n",
		 ProgramName, len);
	exit (1);
    }
    (void) strcpy (retval, s);
    return (retval);
}

/*
 * The following parses options that should be yes or no; it returns -1, 0, 1
 * for error, no, yes.
 */

static int parse_boolean_option (option)
    register char *option;
{
    static struct _booltable {
        char *name;
        int value;
    } booltable[] = {
        { "off", 0 }, { "n", 0 }, { "no", 0 }, { "false", 0 },
        { "on", 1 }, { "y", 1 }, { "yes", 1 }, { "true", 1 },
        { NULL, -1 }};
    register struct _booltable *t;
    register char *cp;

    for (cp = option; *cp; cp++) {
        if (isascii (*cp) && isupper (*cp)) *cp = tolower (*cp);
    }

    for (t = booltable; t->name; t++) {
        if (strcmp (option, t->name) == 0) return (t->value);
    }
    return (-1);
}


/*
 * The following is a hack until XrmParseCommand is ready.  It determines
 * whether or not the given string is an abbreviation of the arg.
 */

static Bool isabbreviation (arg, s, minslen)
    char *arg;
    char *s;
    int minslen;
{
    int arglen;
    int slen;

    /* exact match */
    if (strcmp (arg, s) == 0) return (True);

    arglen = strlen (arg);
    slen = strlen (s);

    /* too long or too short */
    if (slen >= arglen || slen < minslen) return (False);

    /* abbreviation */
    if (strncmp (arg, s, slen) == 0) return (True);

    /* bad */
    return (False);
}


enum e_action {doDefault, doBlack, doWhite, doSolid, doNone, doRoot};

struct s_pair {
	char *resource_name;
	enum e_action action;
} pair_table[] = {
	{ "Black", doBlack },
	{ "White", doWhite },
	{ "None", doNone },
	{ "Root", doRoot },
	{ NULL, doDefault }};


main(argc, argv)
int	argc;
char	*argv[];
{
    Visual visual;
    XSetWindowAttributes xswa;
    int i;
    char *displayname = NULL;
    Display *dpy;
    Colormap cmap;
    enum e_action action = doDefault;
    unsigned long mask;
    int screen;
    int x, y, width, height;
    char *geom = NULL;
    int geom_result;
    int display_width, display_height;
    char *solidcolor = NULL;
    XColor cdef;

    ProgramName = argv[0];

    for (i = 1; i < argc; i++) {
	char *arg = argv[i];

	if (arg[0] == '-') {
	    if (isabbreviation ("-display", arg, 2)) {
		if (++i >= argc) Syntax ();
		displayname = argv[i];
		continue;
	    } else if (isabbreviation ("-geometry", arg, 2)) {
		if (++i >= argc) Syntax ();
		geom = argv[i];
		continue;
	    } else if (isabbreviation ("-black", arg, 2)) {
		action = doBlack;
		continue;
	    } else if (isabbreviation ("-white", arg, 2)) {
		action = doWhite;
		continue;
	    } else if (isabbreviation ("-solid", arg, 2)) {
		if (++i >= argc) Syntax ();
		solidcolor = argv[i];
		action = doSolid;
		continue;
	    } else if (isabbreviation ("-none", arg, 2)) {
		action = doNone;
		continue;
	    } else if (isabbreviation ("-root", arg, 2)) {
		action = doRoot;
		continue;
	    } else 
		Syntax ();
	} else if (arg[0] == '=')			/* obsolete */
	    geom = arg;
	else 
	    Syntax ();
    }

    if ((dpy = XOpenDisplay(displayname)) == NULL) {
	fprintf (stderr, "%s:  unable to open display '%s'\n",
		 ProgramName, XDisplayName (displayname));
	exit (1);
    }

    if (action == doDefault) {
	char *def;

	if ((def = XGetDefault (dpy, ProgramName, "Solid")) != NULL) {
	    solidcolor = copystring (def);
	    action = doSolid;
	} else {
	    struct s_pair *pp;

	    for (pp = pair_table; pp->resource_name != NULL; pp++) {
		def = XGetDefault (dpy, ProgramName, pp->resource_name);
		if (def && parse_boolean_option (def) == 1) {
		    action = pp->action;
		}
	    }
	}
    }

    if (geom == NULL) geom = XGetDefault (dpy, ProgramName, "Geometry");

    screen = DefaultScreen (dpy);
    display_width = DisplayWidth (dpy, screen);
    display_height = DisplayHeight (dpy, screen);
    x = y = 0; 
    width = display_width;
    height = display_height;

    if (DisplayCells (dpy, screen) <= 2 && action == doSolid) {
	if (strcmp (solidcolor, "black") == 0)
	    action = doBlack;
	else if (strcmp (solidcolor, "white") == 0) 
	    action = doWhite;
	else {
	    fprintf (stderr, 
	    	     "%s:  can't use colors on a monochrome display.\n",
		     ProgramName);
	    action = doNone;
	}
    }

    if (geom) 
        geom_result = XParseGeometry (geom, &x, &y,
				      (unsigned int *)&width,
				      (unsigned int *)&height);
    else
	geom_result = NoValue;

    /*
     * For parsing geometry, we want to have the following
     *     
     *     =                (0,0) for (display_width,display_height)
     *     =WxH+X+Y         (X,Y) for (W,H)
     *     =WxH-X-Y         (display_width-W-X,display_height-H-Y) for (W,H)
     *     =+X+Y            (X,Y) for (display_width-X,display_height-Y)
     *     =WxH             (0,0) for (W,H)
     *     =-X-Y            (0,0) for (display_width-X,display_height-Y)
     *
     * If we let any missing values be taken from (0,0) for 
     * (display_width,display_height) we just have to deal with the
     * negative offsets.
     */

    if (geom_result & XNegative) {
	if (geom_result & WidthValue) {
	    x = display_width - width + x;
	} else {
	    width = display_width + x;
	    x = 0;
	}
    } 
    if (geom_result & YNegative) {
	if (geom_result & HeightValue) {
	    y = display_height - height + y;
	} else {
	    height = display_height + y;
	    y = 0;
	}
    }

    mask = 0;
    switch (action) {
	case doBlack:
	    xswa.background_pixel = BlackPixel (dpy, screen);
	    mask |= CWBackPixel;
	    break;
	case doWhite:
	    xswa.background_pixel = WhitePixel (dpy, screen);
	    mask |= CWBackPixel;
	    break;
	case doSolid:
	    cmap = DefaultColormap (dpy, screen);
	    if (XParseColor (dpy, cmap, solidcolor, &cdef) &&
		XAllocColor (dpy, cmap, &cdef)) {
		xswa.background_pixel = cdef.pixel;
		mask |= CWBackPixel;
	    } else {
		fprintf (stderr,"%s:  unable to allocate color '%s'.\n",
			 ProgramName, solidcolor);
		action = doNone;
	    }
	    break;
	case doDefault:
	case doNone:
	    xswa.background_pixmap = None;
	    mask |= CWBackPixmap;
	    break;
	case doRoot:
	    xswa.background_pixmap = ParentRelative;
	    mask |= CWBackPixmap;
	    break;
    }
    xswa.override_redirect = True;
    xswa.backing_store = NotUseful;
    xswa.save_under = False;
    mask |= (CWOverrideRedirect | CWBackingStore | CWSaveUnder);
    visual.visualid = CopyFromParent;
    win = XCreateWindow(dpy, DefaultRootWindow(dpy), x, y, width, height,
	    0, DefaultDepth(dpy, screen), InputOutput, &visual, mask, &xswa);

    /*
     * at some point, we really ought to go walk the tree and turn off 
     * backing store;  or do a ClearArea generating exposures on all windows
     */
    XMapWindow (dpy, win);
    /* the following will free the color that we might have allocateded */
    XCloseDisplay (dpy);
    exit (0);
}

