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There's no way of telling how many colorcells are unallocated.

Your program should work on both monochrome and color screens if possible using something like the following code.

Bool iscolor;
Xcolor blue;
iscolor = (XDisplayCells(display, screen)>2);
foreground = (iscolor &&
              XParsecolor(display,cmap, "blue",&blue) &&
              XAllocColor(display,cmap, &blue))
                    ? blue.pixel : BlackPixel (display,screen));

Tim Love
Mon Mar 11 17:03:18 GMT 1996