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top: correct an insidious occasional truncation buglet

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With the help of our Swedish translator, hopefully the
final buglet has now been vanquished in the multi-byte
translation support. This one was a real nasty bugger.

Although it didn't occur with every terminal emulator,
occasionally random text lines were being chopped off.

As it turns out, those terminals were blameless. There
were two separate places in top's show_special routine
where potential multi-byte sequences were inadequately
addressed. Solution: exploit existing utf-8 functions.

[ it also became apparent that the translation hints ]
[ in the top_nls module were deficient. so a special ]
[ caution was added regarding the final line of txt. ]

Reference(s):
https://gitlab.com/procps-ng/procps/issues/68

Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner 2017-10-01 23:59:59 -05:00 committed by Craig Small
parent d5a9965cde
commit f6ee2c0085
3 changed files with 16 additions and 2 deletions
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4
top/top.c
View File

@ -932,7 +932,7 @@ static void show_special (int interact, const char *glob) {
case 5: case 6: case 7: case 8:
*sub_end = '\0';
snprintf(tmp, sizeof(tmp), "%s%.*s%s"
, Curwin->captab[ch], room, sub_beg, Caps_off);
, Curwin->captab[ch], utf8_embody(sub_beg, room), sub_beg, Caps_off);
rp = scat(rp, tmp);
room -= (sub_end - sub_beg);
room += utf8_delta(sub_beg);
@ -955,7 +955,7 @@ static void show_special (int interact, const char *glob) {
it probably means caller wants to retain cursor position on this final
line. That, in turn, means we're interactive and so we'll just do our
'fit-to-screen' thingy while also leaving room for the cursor... */
if (*glob) PUTT("%.*s", Screen_cols -1, glob);
if (*glob) PUTT("%.*s", utf8_embody(glob, Screen_cols - 1), glob);
} // end: show_special

3
top/top.h
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@ -86,6 +86,9 @@
/* For the impetus and NUMA/Node prototype design, thanks to:
Lance Shelton <LShelton@fusionio.com> - April, 2013 */
/* For prompting & helping with top's utf-8 support, thanks to:
Göran Uddeborg <goeran@uddeborg.se> - September, 2017 */
#ifdef PRETEND2_5_X
#define linux_version_code LINUX_VERSION(2,5,43)
#endif

11
top/top_nls.c
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@ -520,6 +520,17 @@ static void build_uniq_nlstab (void) {
. If you would like additional information regarding these strings,
. please see the prologue to the show_special function in the top.c
. source file.
.
. Caution:
. The next three items represent pages for interacting with a user.
. In all cases, the last lines of text must be treated with care.
.
. They must not end with a newline character so that at runtime the
. cursor will remain on that final text line.
.
. Also, the special sequences (tilde+number) must not appear on the
. last line (the one without the newline). So please avoid any line
. wraps that could place them there.
. */
Uniq_nlstab[KEYS_helpbas_fmt] = _(""