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vt: make use of ucs_get_fallback() when glyph is unavailable

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Attempt to display a fallback character when given character doesn't
have an available glyph. The substitution may not be as good as the
original character but still way more helpful than a squared question
mark.

Example substitutions: À -> A, ç -> c, ø -> o, ─ -> -, © -> C, etc.

See gen_ucs_fallback_table.py for a comprehensive list.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Link: https://lore.kernel.org/r/20250507141535.40655-8-nico@fluxnic.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolas Pitre 2025-05-07 10:13:22 -04:00 committed by Greg Kroah-Hartman
parent fe26933cf1
commit 6802f3591f
1 changed files with 13 additions and 0 deletions
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13
drivers/tty/vt/vt.c
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@ -3007,6 +3007,19 @@ static int vc_get_glyph(struct vc_data *vc, int tc)
return tc;
}
/*
* The Unicode screen memory is allocated only when required.
* This is one such case: we're about to "cheat" with the displayed
* character meaning the simple screen buffer won't hold the original
* information, whereas the Unicode screen buffer always does.
*/
vc_uniscr_check(vc);
/* Try getting a simpler fallback character. */
tc = ucs_get_fallback(tc);
if (tc)
return vc_get_glyph(vc, tc);
/* Display U+FFFD (Unicode Replacement Character). */
return conv_uni_to_pc(vc, UCS_REPLACEMENT);
}