Commit 1c55f187 authored Dec 10, 2008 by Ingo Brueckl Committed by Linus Torvalds Dec 13, 2008

console ASCII glyph 1:1 mapping



For the console, there is a 1:1 mapping of glyphs which cannot be found
in the current font.  This seems to be meant as a kind of 'emergency
fallback' for fonts without unicode mapping which otherwise would
display nothing readable on the screen.

At the moment it affects all chars for which no substitution character
is defined.  In particular this means that for all chars (>= 128) where
there is no iso88591-1/unicode character (e.g.  control character area)
you'll get the very strange 1:1 mapping of the (cp437) graphics card
glyphs.

I'm pretty sure that the 1:1 mapping should only affect strict ASCII
code characters, i.e.  chars < 128.

The patch limits the mapping as it probably was meant anyway.

Signed-off-by: Ingo Brueckl <ib@wupperonline.de>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: Egmont Koblinger <egmont@uhulinux.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent f75bc06e

drivers/char/vt.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2274,7 +2274,7 @@ rescan_last_byte:
		continue; /* nothing to display */
		}
		/* Glyph not found */
		if ((!(vc->vc_utf && !vc->vc_disp_ctrl) \|\| c < 128) && !(c & ~charmask)) {
		if ((!(vc->vc_utf && !vc->vc_disp_ctrl) && c < 128) && !(c & ~charmask)) {
		/* In legacy mode use the glyph we get by a 1:1 mapping.
		This would make absolutely no sense with Unicode in mind,
		but do this for ASCII characters since a font may lack

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