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vt: pad double-width code points with a zero-white-space

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In the Unicode screen buffer, we follow double-width code points with a
space to maintain proper column alignment. This, however, creates
semantic problems when e.g. using cut and paste or selection.

Let's use a better code point for the column padding's purpose i.e. a
zero-white-space rather than a full space.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Link: https://lore.kernel.org/r/20250410011839.64418-12-nico@fluxnic.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolas Pitre 2025-04-09 21:14:03 -04:00 committed by Greg Kroah-Hartman
parent c7cb5b0779
commit 547f57b88d
1 changed files with 8 additions and 3 deletions
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11
drivers/tty/vt/vt.c
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@ -2937,12 +2937,13 @@ static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
width = 2;
} else if (ucs_is_zero_width(c)) {
prev_c = vc_uniscr_getc(vc, -1);
if (prev_c == ' ' &&
if (prev_c == 0x200B &&
ucs_is_double_width(vc_uniscr_getc(vc, -2))) {
/*
* Let's merge this zero-width code point with
* the preceding double-width code point by
* replacing the existing whitespace padding.
* replacing the existing zero-white-space
* padding.
*/
vc_con_rewind(vc);
} else if (c == 0xfe0f && prev_c != 0) {
@ -3040,7 +3041,11 @@ static int vc_con_write_normal(struct vc_data *vc, int tc, int c,
tc = conv_uni_to_pc(vc, ' ');
if (tc < 0)
tc = ' ';
next_c = ' ';
/*
* Store a zero-white-space in the Unicode screen given that
* the previous code point is semantically double-width.
*/
next_c = 0x200B;
}
out: