[2163] in Athena Bugs
X11r3 Xibm server
daemon@ATHENA.MIT.EDU (Steve Ellis)
Thu May 4 09:50:21 1989
To: bugs@ATHENA.MIT.EDU
Date: Thu, 04 May 89 09:49:48 EDT
From: Steve Ellis <ellis@ATHENA.MIT.EDU>
Calling XDrawPoints crashes the X11r3 Xibm server when the points array is
declared size 256. The program below crashes the server when
"#define DOT_BUFF_SIZE 256" is used. Program functions correctly
when "#define DOT_BUFF_SIZE 128" is used.
Test Program:
/* System include files */
#include <stdio.h>
#include <strings.h>
/* X11 include files */
#include <X11/Xlib.h>
static Display *dpyp;
static int bloxscreen;
static Window window;
static XSetWindowAttributes bloxwindow;
static unsigned int bloxwmask;
#define DOT_BUFF_SIZE 256
static int num_dots;
static XPoint dot_buff[DOT_BUFF_SIZE];
static XPoint *dot_buff_ptr;
/* set window size */
static int x_offset = 0;
static int y_offset = 0;
static int x_size = 200;
static int y_size = 200;
static int border_width = 4;
#define CFP CopyFromParent
/* Graphics context related declarations */
GC draw_gc;
static int foreground, background; /* pixel values for drawing colors */
main(argc,argv)
int argc;
char *argv;
{
XGCValues gcv;
unsigned long gcvmask;
char *display = NULL;
XEvent event;
int temp;
if( !(dpyp = XOpenDisplay(display)) ){
fprintf (stderr,
"%s in %s: Unable to open display.\n"
);
}
bloxscreen = DefaultScreen(dpyp);
if (dpyp == (Display *) NULL) {
fprintf (stderr,
"%s in %s: Unable to open display.\n"
);
}
/* Set up master window for blox. */
foreground = BlackPixel(dpyp,bloxscreen);
background = WhitePixel(dpyp,bloxscreen);
bloxwindow.background_pixel = background ;
bloxwindow.border_pixel = foreground ;
bloxwmask = CWBackPixel | CWBorderPixel;
window = XCreateWindow(dpyp, RootWindow(dpyp,bloxscreen),
x_offset, y_offset, x_size, y_size,
border_width,CFP,CFP,CFP,
bloxwmask, &bloxwindow);
if (!window) {
fprintf (stderr,
"%s in %s: Error opening main window.\n"
);
XCloseDisplay (dpyp);
}
/* Make the window visible on the screen. */
XSelectInput(dpyp,window,ExposureMask);
XMapWindow (dpyp, window);
XMaskEvent(dpyp,ExposureMask,&event);
/* set default graphics_context*/
gcv.foreground = foreground;
gcv.background = background;
gcv.function = GXcopy;
gcvmask = GCForeground | GCBackground | GCFunction;
draw_gc = XCreateGC(dpyp,window,gcvmask,&gcv);
dot_buff_ptr = dot_buff;
temp += 50;
vsdot(&temp,&temp);
temp += 50;
vsdot(&temp,&temp);
temp += 50;
vsdot(&temp,&temp);
temp += 50;
vsdot(&temp,&temp);
vsmcur();
sleep (10);
}
vsdot(x1, y1)
int *x1;
int *y1;
{
dot_buff_ptr->x = *x1;
dot_buff_ptr->y = *y1;
num_dots++;
dot_buff_ptr++;
}
vsmcur()
{
if( num_dots > 0)
XDrawPoints (dpyp, window, draw_gc, dot_buff, num_dots,CoordModeOrigin);
XFlush (dpyp);
/* Reset the buffer pointers and the counters. */
dot_buff_ptr = dot_buff;
num_dots = 0;
return;
}
