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Support OSC 4 terminal colour-palette queries.

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Markus Gans points out that some applications which (not at all
unreasonably) don't trust $TERM to tell them the full capabilities of
their terminal will use the sequence "OSC 4 ; nn ; ? BEL" to ask for
the colour-palette value in position nn, and they may not particularly
care _what_ the results are but they will use them to decide whether
the right number of colour palette entries even exist.
This commit is contained in:
Simon Tatham
2017-10-05 20:43:02 +01:00
parent 262376a054
commit 4743798400
5 changed files with 96 additions and 35 deletions
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66
terminal.c
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@ -2727,6 +2727,22 @@ static void do_osc(Terminal *term)
if (!term->no_remote_wintitle)
set_title(term->frontend, term->osc_string);
break;
case 4:
if (term->ldisc && !strcmp(term->osc_string, "?")) {
int r, g, b;
if (palette_get(term->frontend, toint(term->esc_args[1]),
&r, &g, &b)) {
char *reply_buf = dupprintf(
"\033]4;%u;rgb:%04x/%04x/%04x\007",
term->esc_args[1],
(unsigned)r * 0x0101,
(unsigned)g * 0x0101,
(unsigned)b * 0x0101);
ldisc_send(term->ldisc, reply_buf, strlen(reply_buf), 0);
sfree(reply_buf);
}
}
break;
}
}
}
@ -3365,6 +3381,7 @@ static void term_out(Terminal *term)
compatibility(OTHER);
term->termstate = SEEN_OSC;
term->esc_args[0] = 0;
term->esc_nargs = 1;
break;
case '7': /* DECSC: save cursor */
compatibility(VT100);
@ -4470,25 +4487,40 @@ static void term_out(Terminal *term)
case '7':
case '8':
case '9':
if (term->esc_args[0] <= UINT_MAX / 10 &&
term->esc_args[0] * 10 <= UINT_MAX - c - '0')
term->esc_args[0] = 10 * term->esc_args[0] + c - '0';
if (term->esc_args[term->esc_nargs-1] <= UINT_MAX / 10 &&
term->esc_args[term->esc_nargs-1] * 10 <= UINT_MAX - c - '0')
term->esc_args[term->esc_nargs-1] =
10 * term->esc_args[term->esc_nargs-1] + c - '0';
else
term->esc_args[0] = UINT_MAX;
term->esc_args[term->esc_nargs-1] = UINT_MAX;
break;
case 'L':
/*
* Grotty hack to support xterm and DECterm title
* sequences concurrently.
*/
if (term->esc_args[0] == 2) {
term->esc_args[0] = 1;
break;
}
/* else fall through */
default:
term->termstate = OSC_STRING;
term->osc_strlen = 0;
default:
/*
* _Most_ other characters here terminate the
* immediate parsing of the OSC sequence and go
* into OSC_STRING state, but we deal with a
* couple of exceptions first.
*/
if (c == 'L' && term->esc_args[0] == 2) {
/*
* Grotty hack to support xterm and DECterm title
* sequences concurrently.
*/
term->esc_args[0] = 1;
} else if (c == ';' && term->esc_nargs == 1 &&
term->esc_args[0] == 4) {
/*
* xterm's OSC 4 sequence to query the current
* RGB value of a colour takes a second
* numeric argument which is easiest to parse
* using the existing system rather than in
* do_osc.
*/
term->esc_args[term->esc_nargs++] = 0;
} else {
term->termstate = OSC_STRING;
term->osc_strlen = 0;
}
}
break;
case OSC_STRING: