R6.6 is the Xorg base-lineXORG-MAINXORG-STABLE

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+/* $Xorg: dsimple.c,v 1.4 2001/02/09 02:05:54 xorgcvs Exp $ */
+/*
+
+Copyright 1993, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+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 OPEN GROUP 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 Open Group 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 Open Group.
+
+*/
+
+#include <X11/Xos.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/cursorfont.h>
+#include <stdio.h>
+/*
+ * Other_stuff.h: Definitions of routines in other_stuff.
+ *
+ * Written by Mark Lillibridge.   Last updated 7/1/87
+ */
+
+unsigned long Resolve_Color();
+Pixmap Bitmap_To_Pixmap();
+Window Select_Window();
+void out();
+void blip();
+Window Window_With_Name();
+void Fatal_Error();
+
+/*
+ * Just_display: A group of routines designed to make the writting of simple
+ *               X11 applications which open a display but do not open
+ *               any windows much faster and easier.  Unless a routine says
+ *               otherwise, it may be assumed to require program_name, dpy,
+ *               and screen already defined on entry.
+ *
+ * Written by Mark Lillibridge.   Last updated 7/1/87
+ */
+
+
+/* This stuff is defined in the calling program by just_display.h */
+extern char *program_name;
+extern Display *dpy;
+extern int screen;
+
+
+/*
+ * Malloc: like malloc but handles out of memory using Fatal_Error.
+ */
+char *Malloc(size)
+     unsigned size;
+{
+	char *data, *malloc();
+
+	if (!(data = malloc(size)))
+	  Fatal_Error("Out of memory!");
+
+	return(data);
+}
+	
+
+/*
+ * Realloc: like Malloc except for realloc, handles NULL using Malloc.
+ */
+char *Realloc(ptr, size)
+        char *ptr;
+        int size;
+{
+	char *new_ptr, *realloc();
+
+	if (!ptr)
+	  return(Malloc(size));
+
+	if (!(new_ptr = realloc(ptr, size)))
+	  Fatal_Error("Out of memory!");
+
+	return(new_ptr);
+}
+
+
+/*
+ * Get_Display_Name (argc, argv) Look for -display, -d, or host:dpy (obselete)
+ * If found, remove it from command line.  Don't go past a lone -.
+ */
+char *Get_Display_Name(pargc, argv)
+    int *pargc;  /* MODIFIED */
+    char **argv; /* MODIFIED */
+{
+    int argc = *pargc;
+    char **pargv = argv+1;
+    char *displayname = NULL;
+    int i;
+
+    for (i = 1; i < argc; i++) {
+	char *arg = argv[i];
+
+	if (!strcmp (arg, "-display") || !strcmp (arg, "-d")) {
+	    if (++i >= argc) usage ();
+
+	    displayname = argv[i];
+	    *pargc -= 2;
+	    continue;
+	}
+	if (!strcmp(arg,"-")) {
+		while (i<argc)
+			*pargv++ = argv[i++];
+		break;
+	}
+	*pargv++ = arg;
+    }
+
+    *pargv = NULL;
+    return (displayname);
+}
+
+
+/*
+ * Open_Display: Routine to open a display with correct error handling.
+ *               Does not require dpy or screen defined on entry.
+ */
+Display *Open_Display(display_name)
+char *display_name;
+{
+	Display *d;
+
+	d = XOpenDisplay(display_name);
+	if (d == NULL) {
+	    fprintf (stderr, "%s:  unable to open display '%s'\n",
+		     program_name, XDisplayName (display_name));
+	    usage ();
+	    /* doesn't return */
+	}
+
+	return(d);
+}
+
+
+/*
+ * Setup_Display_And_Screen: This routine opens up the correct display (i.e.,
+ *                           it calls Get_Display_Name) and then stores a
+ *                           pointer to it in dpy.  The default screen
+ *                           for this display is then stored in screen.
+ *                           Does not require dpy or screen defined.
+ */
+void Setup_Display_And_Screen(argc, argv)
+int *argc;      /* MODIFIED */
+char **argv;    /* MODIFIED */
+{
+	dpy = Open_Display (Get_Display_Name(argc, argv));
+	screen = DefaultScreen(dpy);
+}
+
+
+/*
+ * Open_Font: This routine opens a font with error handling.
+ */
+XFontStruct *Open_Font(name)
+char *name;
+{
+	XFontStruct *font;
+
+	if (!(font=XLoadQueryFont(dpy, name)))
+	  Fatal_Error("Unable to open font %s!", name);
+
+	return(font);
+}
+
+
+/*
+ * Beep: Routine to beep the display.
+ */
+void Beep()
+{
+	XBell(dpy, 50);
+}
+
+
+/*
+ * ReadBitmapFile: same as XReadBitmapFile except it returns the bitmap
+ *                 directly and handles errors using Fatal_Error.
+ */
+static void _bitmap_error(status, filename)
+     int status;
+     char *filename;
+{
+  if (status == BitmapOpenFailed)
+    Fatal_Error("Can't open file %s!", filename);
+  else if (status == BitmapFileInvalid)
+    Fatal_Error("file %s: Bad bitmap format.", filename);
+  else
+    Fatal_Error("Out of memory!");
+}
+
+Pixmap ReadBitmapFile(d, filename, width, height, x_hot, y_hot)
+     Drawable d;
+     char *filename;
+     int *width, *height, *x_hot, *y_hot;
+{
+  Pixmap bitmap;
+  int status;
+
+  status = XReadBitmapFile(dpy, RootWindow(dpy, screen), filename,
+			   (unsigned int *)width, (unsigned int *)height,
+			   &bitmap, x_hot, y_hot);
+  if (status != BitmapSuccess)
+    _bitmap_error(status, filename);
+
+  return(bitmap);
+}
+
+
+/*
+ * WriteBitmapFile: same as XWriteBitmapFile except it handles errors
+ *                  using Fatal_Error.
+ */
+void WriteBitmapFile(filename, bitmap, width, height, x_hot, y_hot)
+     char *filename;
+     Pixmap bitmap;
+     int width, height, x_hot, y_hot;
+{
+  int status;
+
+  status= XWriteBitmapFile(dpy, filename, bitmap, width, height, x_hot,
+			   y_hot);
+  if (status != BitmapSuccess)
+    _bitmap_error(status, filename);
+}
+
+
+/*
+ * Select_Window_Args: a rountine to provide a common interface for
+ *                     applications that need to allow the user to select one
+ *                     window on the screen for special consideration.
+ *                     This routine implements the following command line
+ *                     arguments:
+ *
+ *                       -root            Selects the root window.
+ *                       -id <id>         Selects window with id <id>. <id> may
+ *                                        be either in decimal or hex.
+ *                       -name <name>     Selects the window with name <name>.
+ *
+ *                     Call as Select_Window_Args(&argc, argv) in main before
+ *                     parsing any of your program's command line arguments.
+ *                     Select_Window_Args will remove its arguments so that
+ *                     your program does not have to worry about them.
+ *                     The window returned is the window selected or 0 if
+ *                     none of the above arguments was present.  If 0 is
+ *                     returned, Select_Window should probably be called after
+ *                     all command line arguments, and other setup is done.
+ *                     For examples of usage, see xwininfo, xwd, or xprop.
+ */
+Window Select_Window_Args(rargc, argv)
+     int *rargc;
+     char **argv;
+#define ARGC (*rargc)
+{
+	int nargc=1;
+	int argc;
+	char **nargv;
+	Window w=0;
+
+	nargv = argv+1; argc = ARGC;
+#define OPTION argv[0]
+#define NXTOPTP ++argv, --argc>0
+#define NXTOPT if (++argv, --argc==0) usage()
+#define COPYOPT nargv++[0]=OPTION, nargc++
+
+	while (NXTOPTP) {
+		if (!strcmp(OPTION, "-")) {
+			COPYOPT;
+			while (NXTOPTP)
+			  COPYOPT;
+			break;
+		}
+		if (!strcmp(OPTION, "-root")) {
+			w=RootWindow(dpy, screen);
+			continue;
+		}
+		if (!strcmp(OPTION, "-name")) {
+			NXTOPT;
+			w = Window_With_Name(dpy, RootWindow(dpy, screen),
+					     OPTION);
+			if (!w)
+			  Fatal_Error("No window with name %s exists!",OPTION);
+			continue;
+		}
+		if (!strcmp(OPTION, "-id")) {
+			NXTOPT;
+			w=0;
+			sscanf(OPTION, "0x%lx", &w);
+			if (!w)
+			  sscanf(OPTION, "%ld", &w);
+			if (!w)
+			  Fatal_Error("Invalid window id format: %s.", OPTION);
+			continue;
+		}
+		COPYOPT;
+	}
+	ARGC = nargc;
+	
+	return(w);
+}
+
+/*
+ * Other_stuff: A group of routines which do common X11 tasks.
+ *
+ * Written by Mark Lillibridge.   Last updated 7/1/87
+ */
+
+extern Display *dpy;
+extern int screen;
+
+/*
+ * Resolve_Color: This routine takes a color name and returns the pixel #
+ *                that when used in the window w will be of color name.
+ *                (WARNING:  The colormap of w MAY be modified! )
+ *                If colors are run out of, only the first n colors will be
+ *                as correct as the hardware can make them where n depends
+ *                on the display.  This routine does not require wind to
+ *                be defined.
+ */
+unsigned long Resolve_Color(w, name)
+     Window w;
+     char *name;
+{
+	XColor c;
+	Colormap colormap;
+	XWindowAttributes wind_info;
+
+	/*
+	 * The following is a hack to insure machines without a rgb table
+	 * handle at least white & black right.
+	 */
+	if (!strcmp(name, "white"))
+	  name="#ffffffffffff";
+	if (!strcmp(name, "black"))
+	  name="#000000000000";
+
+	XGetWindowAttributes(dpy, w, &wind_info);
+	colormap = wind_info.colormap;
+
+	if (!XParseColor(dpy, colormap, name, &c))
+	  Fatal_Error("Bad color format '%s'.", name);
+
+	if (!XAllocColor(dpy, colormap, &c))
+	  Fatal_Error("XAllocColor failed!");
+
+	return(c.pixel);
+}
+
+
+/*
+ * Bitmap_To_Pixmap: Convert a bitmap to a 2 colored pixmap.  The colors come
+ *                   from the foreground and background colors of the gc.
+ *                   Width and height are required solely for efficiency.
+ *                   If needed, they can be obtained via. XGetGeometry.
+ */
+Pixmap Bitmap_To_Pixmap(dpy, d, gc, bitmap, width, height)
+     Display *dpy;
+     Drawable d;
+     GC gc;
+     Pixmap bitmap;
+     int width, height;
+{
+  Pixmap pix;
+  int x;
+  unsigned int i, depth;
+  Drawable root;
+
+  if (!XGetGeometry(dpy, d, &root, &x, &x, &i, &i, &i, &depth))
+    return(0);
+
+  pix = XCreatePixmap(dpy, d, width, height, (int)depth);
+
+  XCopyPlane(dpy, bitmap, pix, gc, 0, 0, width, height, 0, 0, 1);
+
+  return(pix);
+}
+
+
+/*
+ * blip: a debugging routine.  Prints Blip! on stderr with flushing. 
+ */
+void blip()
+{
+  outl("blip!");
+}
+
+
+/*
+ * Routine to let user select a window using the mouse
+ */
+
+Window Select_Window(dpy)
+     Display *dpy;
+{
+  int status;
+  Cursor cursor;
+  XEvent event;
+  Window target_win = None, root = RootWindow(dpy,screen);
+  int buttons = 0;
+
+  /* Make the target cursor */
+  cursor = XCreateFontCursor(dpy, XC_crosshair);
+
+  /* Grab the pointer using target cursor, letting it room all over */
+  status = XGrabPointer(dpy, root, False,
+			ButtonPressMask|ButtonReleaseMask, GrabModeSync,
+			GrabModeAsync, root, cursor, CurrentTime);
+  if (status != GrabSuccess) Fatal_Error("Can't grab the mouse.");
+
+  /* Let the user select a window... */
+  while ((target_win == None) || (buttons != 0)) {
+    /* allow one more event */
+    XAllowEvents(dpy, SyncPointer, CurrentTime);
+    XWindowEvent(dpy, root, ButtonPressMask|ButtonReleaseMask, &event);
+    switch (event.type) {
+    case ButtonPress:
+      if (target_win == None) {
+	target_win = event.xbutton.subwindow; /* window selected */
+	if (target_win == None) target_win = root;
+      }
+      buttons++;
+      break;
+    case ButtonRelease:
+      if (buttons > 0) /* there may have been some down before we started */
+	buttons--;
+       break;
+    }
+  } 
+
+  XUngrabPointer(dpy, CurrentTime);      /* Done with pointer */
+
+  return(target_win);
+}
+
+
+/*
+ * Window_With_Name: routine to locate a window with a given name on a display.
+ *                   If no window with the given name is found, 0 is returned.
+ *                   If more than one window has the given name, the first
+ *                   one found will be returned.  Only top and its subwindows
+ *                   are looked at.  Normally, top should be the RootWindow.
+ */
+Window Window_With_Name(dpy, top, name)
+     Display *dpy;
+     Window top;
+     char *name;
+{
+	Window *children, dummy;
+	unsigned int nchildren;
+	int i;
+	Window w=0;
+	char *window_name;
+
+	if (XFetchName(dpy, top, &window_name) && !strcmp(window_name, name))
+	  return(top);
+
+	if (!XQueryTree(dpy, top, &dummy, &dummy, &children, &nchildren))
+	  return(0);
+
+	for (i=0; i<nchildren; i++) {
+		w = Window_With_Name(dpy, children[i], name);
+		if (w)
+		  break;
+	}
+	if (children) XFree ((char *)children);
+	return(w);
+}
+
+/*
+ * outl: a debugging routine.  Flushes stdout then prints a message on stderr
+ *       and flushes stderr.  Used to print messages when past certain points
+ *       in code so we can tell where we are.  Outl may be invoked like
+ *       printf with up to 7 arguments.
+ */
+/* VARARGS1 */
+outl(msg, arg0,arg1,arg2,arg3,arg4,arg5,arg6)
+     char *msg;
+     char *arg0, *arg1, *arg2, *arg3, *arg4, *arg5, *arg6;
+{
+	fflush(stdout);
+	fprintf(stderr, msg, arg0, arg1, arg2, arg3, arg4, arg5, arg6);
+	fprintf(stderr, "\n");
+	fflush(stderr);
+}
+
+
+/*
+ * Standard fatal error routine - call like printf but maximum of 7 arguments.
+ * Does not require dpy or screen defined.
+ */
+/* VARARGS1 */
+void Fatal_Error(msg, arg0,arg1,arg2,arg3,arg4,arg5,arg6)
+char *msg;
+char *arg0, *arg1, *arg2, *arg3, *arg4, *arg5, *arg6;
+{
+	fflush(stdout);
+	fflush(stderr);
+	fprintf(stderr, "%s: error: ", program_name);
+	fprintf(stderr, msg, arg0, arg1, arg2, arg3, arg4, arg5, arg6);
+	fprintf(stderr, "\n");
+	exit(1);
+}