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-Software cursor for VGA by Pavel Machek <email@example.com>
-======================= and Martin Mares <firstname.lastname@example.org>
- Linux now has some ability to manipulate cursor appearance. Normally, you
-can set the size of hardware cursor (and also work around some ugly bugs in
-those miserable Trident cards--see #define TRIDENT_GLITCH in drivers/video/
-vgacon.c). You can now play a few new tricks: you can make your cursor look
-like a non-blinking red block, make it inverse background of the character it's
-over or to highlight that character and still choose whether the original
-hardware cursor should remain visible or not. There may be other things I have
-never thought of.
- The cursor appearance is controlled by a "<ESC>[?1;2;3c" escape sequence
-where 1, 2 and 3 are parameters described below. If you omit any of them,
-they will default to zeroes.
- Parameter 1 specifies cursor size (0=default, 1=invisible, 2=underline, ...,
-8=full block) + 16 if you want the software cursor to be applied + 32 if you
-want to always change the background color + 64 if you dislike having the
-background the same as the foreground. Highlights are ignored for the last two
- The second parameter selects character attribute bits you want to change
-(by simply XORing them with the value of this parameter). On standard VGA,
-the high four bits specify background and the low four the foreground. In both
-groups, low three bits set color (as in normal color codes used by the console)
-and the most significant one turns on highlight (or sometimes blinking--it
-depends on the configuration of your VGA).
- The third parameter consists of character attribute bits you want to set.
-Bit setting takes place before bit toggling, so you can simply clear a bit by
-including it in both the set mask and the toggle mask.
-To get normal blinking underline, use: echo -e '\033[?2c'
-To get blinking block, use: echo -e '\033[?6c'
-To get red non-blinking block, use: echo -e '\033[?17;0;64c'