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Check the terminfo(5) U8 capability and disable using UTF-8 for ACS if

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it is present and zero. This is useful for users with terminals or fonts
that do not correctly support UTF-8 line drawing characters. GitHub
issue 927, reported by Hiroaki Yamazoe and Akinori Hattori.
This commit is contained in:
nicm
2017-05-15 16:44:04 +00:00
parent b160de5cb4
commit 1ba7f1d03f
4 changed files with 45 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
tty-acs.c
View File

@ -74,23 +74,48 @@ tty_acs_cmp(const void *key, const void *value)
return (ch - entry->key);
}
/* Should this terminal use ACS instead of UTF-8 line drawing? */
int
tty_acs_needed(struct tty *tty)
{
if (tty == NULL)
return (0);
/*
* If the U8 flag is present, it marks whether a terminal supports
* UTF-8 and ACS together.
*
* If it is present and zero, we force ACS - this gives users a way to
* turn off UTF-8 line drawing.
*
* If it is nonzero, we can fall through to the default and use UTF-8
* line drawing on UTF-8 terminals.
*/
if (tty_term_has(tty->term, TTYC_U8) &&
tty_term_number(tty->term, TTYC_U8) == 0)
return (1);
if (tty->flags & TTY_UTF8)
return (0);
return (1);
}
/* Retrieve ACS to output as a string. */
const char *
tty_acs_get(struct tty *tty, u_char ch)
{
struct tty_acs_entry *entry;
struct tty_acs_entry *entry;
/* If not a UTF-8 terminal, use the ACS set. */
if (tty != NULL && !(tty->flags & TTY_UTF8)) {
/* Use the ACS set instead of UTF-8 if needed. */
if (tty_acs_needed(tty)) {
if (tty->term->acs[ch][0] == '\0')
return (NULL);
return (&tty->term->acs[ch][0]);
}
/* Otherwise look up the UTF-8 translation. */
entry = bsearch(&ch,
tty_acs_table, nitems(tty_acs_table), sizeof tty_acs_table[0],
tty_acs_cmp);
entry = bsearch(&ch, tty_acs_table, nitems(tty_acs_table),
sizeof tty_acs_table[0], tty_acs_cmp);
if (entry == NULL)
return (NULL);
return (entry->string);