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+/* $XConsortium: xcalc.c,v 1.16 94/04/17 20:43:31 converse Exp $ */
+/*
+
+Copyright (c) 1989  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.
+
+*/
+/* $XFree86: xc/programs/xcalc/xcalc.c,v 1.2 2000/05/11 18:14:41 tsi Exp $ */
+
+/*
+ * xcalc.c  -  a hand calculator for the X Window system
+ *
+ *  Original Author:  John H. Bradley, University of Pennsylvania
+ *			(bradley@cis.upenn.edu)  March, 1987
+ *  RPN mode added and port to X11 by Mark Rosenstein, MIT Project Athena
+ *  Rewritten to be an Xaw and Xt client by Donna Converse, MIT X Consortium
+ */
+
+#include <stdio.h>
+#include <math.h>
+#include <signal.h>
+#include <X11/Intrinsic.h>
+#include <X11/StringDefs.h>
+#include <X11/Xatom.h>
+#include <X11/Shell.h>
+#include <X11/Xaw/Cardinals.h>
+#include <X11/Xaw/Form.h>
+#include <X11/Xaw/Label.h>
+#include <X11/Xaw/Command.h>
+#include <X11/Xaw/Toggle.h>
+#include <X11/cursorfont.h>
+#include "xcalc.h"
+#include "actions.h"
+
+#ifndef IEEE
+extern signal_t fperr();
+extern signal_t illerr();
+#endif
+
+/*
+ *	global data
+ */
+int	rpn = 0;		/* Reverse Polish Notation (HP mode) flag */
+#define LCD_STR_LEN	32
+char	dispstr[LCD_STR_LEN];		/* string to show up in the LCD */
+Atom	wm_delete_window;		/* see ICCCM section 5.2.2 */
+
+/*
+ *	local data 
+ */
+static Display	*dpy = NULL;		/* connection to the X server */
+static Widget	toplevel=NULL;  	/* top level shell widget */
+static Widget   calculator=NULL;	/* an underlying form widget */
+static Widget	LCD = NULL;		/* liquid crystal display */
+static Widget	ind[6];			/* mode indicators in the screen */
+static char	selstr[LCD_STR_LEN]; /* storage for selections from the LCD */
+					/* checkerboard used in mono mode */
+static XtAppContext xtcontext;		/* Toolkit application context */
+#define check_width 16
+#define check_height 16
+static unsigned char check_bits[] = {
+   0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa,
+   0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa,
+   0x55, 0x55, 0xaa, 0xaa, 0x55, 0x55, 0xaa, 0xaa};
+
+/*	command line options specific to the application */
+static XrmOptionDescRec Options[] = {
+{"-rpn",	"rpn",		XrmoptionNoArg,		(XtPointer)"on"},
+{"-stipple",	"stipple",	XrmoptionNoArg,		(XtPointer)"on"}
+};
+
+/*	resources specific to the application */
+static struct resources {
+    Boolean	rpn;		/* reverse polish notation (HP mode) */
+    Boolean	stipple;	/* background stipple */
+    Cursor	cursor;
+} appResources;
+
+#define offset(field) XtOffsetOf(struct resources, field)
+static XtResource Resources[] = {
+{"rpn",		"Rpn",		XtRBoolean,	sizeof(Boolean),
+     offset(rpn),	XtRImmediate,	(XtPointer) False},
+{"stipple",	"Stipple",	XtRBoolean,	sizeof(Boolean),
+     offset(stipple),	XtRImmediate,	(XtPointer) False},
+{"cursor",	"Cursor",	XtRCursor,	sizeof(Cursor),
+     offset(cursor),	XtRCursor,	(XtPointer)NULL}
+};
+#undef offset
+
+
+int
+main(argc, argv)
+    int		argc;
+    char	**argv;
+{
+    Arg		args[3];
+
+    void create_calculator();
+    void Quit(), Syntax();
+
+
+    XtSetLanguageProc(NULL, (XtLanguageProc) NULL, NULL);
+
+    toplevel = XtAppInitialize(&xtcontext, "XCalc", Options, XtNumber(Options),
+			       &argc, argv, NULL, NULL, 0);
+    if (argc != 1) Syntax(argc, argv);
+    
+    XtSetArg(args[0], XtNinput, True);
+    XtSetValues(toplevel, args, ONE);
+
+    XtGetApplicationResources(toplevel, (XtPointer)&appResources, Resources,
+			      XtNumber(Resources), (ArgList) NULL, ZERO);
+
+    create_calculator(toplevel);
+
+    XtAppAddActions(xtcontext, Actions, XtNumber(Actions));
+
+    XtOverrideTranslations(toplevel, 
+	   XtParseTranslationTable("<Message>WM_PROTOCOLS: quit()\n"));
+
+    XtRealizeWidget(toplevel);
+
+    dpy = XtDisplay(toplevel);
+    wm_delete_window = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
+    (void) XSetWMProtocols(dpy, XtWindow(toplevel), &wm_delete_window, 1);
+    XDefineCursor(dpy, XtWindow(toplevel), appResources.cursor);
+
+    if (appResources.stipple || (CellsOfScreen(XtScreen(toplevel)) <= 2))
+    {
+	Screen	*screen = XtScreen(toplevel);
+	Pixmap	backgroundPix;
+
+	backgroundPix = XCreatePixmapFromBitmapData
+	    (dpy, XtWindow(toplevel),
+	     (char *)check_bits, check_width, check_height,
+	     WhitePixelOfScreen(screen), BlackPixelOfScreen(screen),
+	     DefaultDepthOfScreen(screen));
+	XtSetArg(args[0], XtNbackgroundPixmap, backgroundPix);
+	XtSetValues(calculator, args, ONE);
+    }
+
+#ifndef IEEE
+    signal(SIGFPE,fperr);
+    signal(SIGILL,illerr);
+#endif
+    ResetCalc();
+    XtAppMainLoop(xtcontext);
+
+    return 0;
+}
+
+void create_calculator(shell)
+    Widget	shell;
+{
+    void create_display();
+    void create_keypad();
+
+    rpn = appResources.rpn;
+    calculator = XtCreateManagedWidget(rpn ? "hp" : "ti", formWidgetClass,
+				       shell, (ArgList) NULL, ZERO);
+    create_display(calculator);
+    create_keypad(calculator);
+    XtSetKeyboardFocus(calculator, LCD);
+}
+
+/*
+ *	Do the calculator data display widgets.
+ */
+void create_display(parent)
+    Widget	parent;
+{
+    Widget	bevel, screen;
+    static Arg	args[] = {
+    	{XtNborderWidth, (XtArgVal)0},
+    	{XtNjustify, (XtArgVal)XtJustifyRight}
+    };
+
+    /* the frame surrounding the calculator display */
+    bevel = XtCreateManagedWidget("bevel", formWidgetClass, parent,
+				  (ArgList) NULL, ZERO);
+
+    /* the screen of the calculator */
+    screen = XtCreateManagedWidget("screen", formWidgetClass, bevel,
+				   (ArgList) NULL, ZERO);
+
+    /* M - the memory indicator */
+    ind[XCalc_MEMORY] = XtCreateManagedWidget("M", labelWidgetClass, screen,
+					args, XtNumber(args));
+
+    /* liquid crystal display */
+    LCD = XtCreateManagedWidget("LCD", toggleWidgetClass, screen, args,
+				XtNumber(args));
+
+    /* INV - the inverse function indicator */
+    ind[XCalc_INVERSE] = XtCreateManagedWidget("INV", labelWidgetClass, 
+					 screen, args, XtNumber(args));
+
+    /* DEG - the degrees switch indicator */
+    ind[XCalc_DEGREE] = XtCreateManagedWidget("DEG", labelWidgetClass, screen,
+					args, XtNumber(args));
+
+    /* RAD - the radian switch indicator */
+    ind[XCalc_RADIAN] = XtCreateManagedWidget("RAD", labelWidgetClass, screen,
+					args, XtNumber(args));
+
+    /* GRAD - the grad switch indicator */
+    ind[XCalc_GRADAM] = XtCreateManagedWidget("GRAD", labelWidgetClass, screen,
+					args, XtNumber(args));
+
+    /* () - the parenthesis indicator */
+    ind[XCalc_PAREN] = XtCreateManagedWidget("P", labelWidgetClass, screen,
+					     args, XtNumber(args));
+}
+
+/*
+ *	Do all the buttons.  The application defaults file will give the
+ *	default button placement, default button labels, and default 
+ *      actions connected to the buttons.  The user can change any of 
+ *      these defaults in an environment-specific resource file.
+ */
+
+void create_keypad(parent)
+    Widget	parent;
+{
+    static char	*Keyboard[] = {
+	"button1", "button2", "button3", "button4", "button5",
+	"button6", "button7", "button8", "button9", "button10",
+	"button11","button12","button13","button14","button15",
+	"button16","button17","button18","button19","button20",
+	"button21","button22","button23","button24","button25",
+	"button26","button27","button28","button29","button30",
+	"button31","button32","button33","button34","button35",
+	"button36","button37","button38","button39","button40"
+	};
+    register int i;
+    int		 n = XtNumber(Keyboard);
+
+    if (appResources.rpn) n--; 	/* HP has 39 buttons, TI has 40 */
+
+    for (i=0; i < n; i++)
+	XtCreateManagedWidget(Keyboard[i], commandWidgetClass, parent,
+			      (ArgList) NULL, ZERO);
+}
+
+/*
+ *	Miscellaneous utility routines that interact with the widgets.
+ */
+
+/*
+ * 	called by math routines to write to the liquid crystal display.
+ */
+void draw(string)
+    char	*string;
+{
+    Arg	args[1];
+
+    XtSetArg(args[0], XtNlabel, string);
+    XtSetValues(LCD, args, ONE);
+}
+/*
+ *	called by math routines to turn on and off the display indicators.
+ */
+void setflag(indicator, on)
+    int		indicator;
+    Boolean	on;
+{
+    if (on) XtMapWidget(ind[indicator]);
+    else XtUnmapWidget(ind[indicator]);
+}
+
+/*
+ *	ring the bell.
+ */
+void ringbell()
+{
+    XBell(dpy, 0);
+}
+
+/*
+ *	die.
+ */
+void Quit()
+{
+    extern void exit();
+    XtDestroyApplicationContext(xtcontext);
+    exit(0);
+}
+
+/*  
+ *	recite and die.
+ */
+void Syntax(argc, argv)	
+    int		argc;
+    char	**argv;
+{
+    register int i;
+    extern void exit();
+    (void) fprintf(stderr, "%s: unknown options:", argv[0]);
+    for (i=1; i <argc; i++)
+	(void) fprintf(stderr, " %s", argv[i]);
+    (void) fprintf(stderr, "\n\n");
+    (void) fprintf(stderr, "Usage:  %s", argv[0]);
+    for (i=0; i < XtNumber(Options); i++)
+	(void) fprintf(stderr, " [%s]", Options[i].option);
+    (void) fprintf(stderr, "\n");
+    XtDestroyApplicationContext(xtcontext);
+    exit(1);
+}
+
+/*    
+ * I use actions on the toggle widget to support selections.  This
+ * means that the user may not do a partial selection of the number
+ * displayed in the `liquid crystal display.'  Copying numbers into
+ * the calculator is also not supported.  So all you can do is copy
+ * the entire number from the calculator display.
+ */
+
+/*ARGSUSED*/
+Boolean convert(w, selection, target, type, value, length, format)
+    Widget	w;
+    Atom	*selection;
+    Atom	*target;
+    Atom	*type;
+    XtPointer	*value;
+    unsigned long	*length;
+    int		*format;
+{
+    if (*target == XA_STRING)
+    {
+	*type = XA_STRING;
+	*length = strlen(dispstr);
+	strncpy(selstr, dispstr, (int)(*length));
+	*value = selstr;
+	*format = 8;
+	return True;
+    }
+    return False;
+}
+
+/*
+ * called when xcalc loses ownership of the selection.
+ */
+/*ARGSUSED*/
+void lose(w, selection)
+    Widget	w;
+    Atom	*selection;
+{
+    XawToggleUnsetCurrent(LCD);
+}
+
+/*
+ * called when some other client got the selection.
+ */
+/*ARGSUSED*/
+void done(w, selection, target)
+    Widget	w;
+    Atom	*selection;
+    Atom	*target;
+{
+    selstr[0] = '\0';
+}
+
+/*
+ * called by the selection() action routine, in response to user action.
+ */
+void do_select(time)
+    Time	time;
+{
+    Boolean	state;
+    Arg		args[1];
+
+    XtSetArg(args[0], XtNstate, &state);
+    XtGetValues(LCD, args, 1);
+
+    if (state)
+        XtOwnSelection(LCD, XA_PRIMARY, time, convert, lose, done);
+    else
+	selstr[0] = '\0';
+}