diff options
| author | Nicolas Pitre <npitre@baylibre.com> | 2025-05-07 10:13:22 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-21 13:39:45 +0200 |
| commit | 6802f3591fdc732d2460eed3112b02cc07acab8f (patch) | |
| tree | 131682f7bd0dd956fa11f91f4d8a8058ca694147 | |
| parent | fe26933cf1e151ce0a5d858c263e8dacb2f12cee (diff) | |
vt: make use of ucs_get_fallback() when glyph is unavailable
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>
| -rw-r--r-- | drivers/tty/vt/vt.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 556af82a9231..efb761454166 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -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); } |