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/* $OpenBSD: tty-acs.c,v 1.13 2023/08/08 07:19:48 nicm Exp $ */
/*
* Copyright (c) 2010 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include "tmux.h"
/* Table mapping ACS entries to UTF-8. */
struct tty_acs_entry {
u_char key;
const char *string;
};
static const struct tty_acs_entry tty_acs_table[] = {
{ '+', "\342\206\222" }, /* arrow pointing right */
{ ',', "\342\206\220" }, /* arrow pointing left */
{ '-', "\342\206\221" }, /* arrow pointing up */
{ '.', "\342\206\223" }, /* arrow pointing down */
{ '0', "\342\226\256" }, /* solid square block */
{ '`', "\342\227\206" }, /* diamond */
{ 'a', "\342\226\222" }, /* checker board (stipple) */
{ 'b', "\342\220\211" },
{ 'c', "\342\220\214" },
{ 'd', "\342\220\215" },
{ 'e', "\342\220\212" },
{ 'f', "\302\260" }, /* degree symbol */
{ 'g', "\302\261" }, /* plus/minus */
{ 'h', "\342\220\244" },
{ 'i', "\342\220\213" },
{ 'j', "\342\224\230" }, /* lower right corner */
{ 'k', "\342\224\220" }, /* upper right corner */
{ 'l', "\342\224\214" }, /* upper left corner */
{ 'm', "\342\224\224" }, /* lower left corner */
{ 'n', "\342\224\274" }, /* large plus or crossover */
{ 'o', "\342\216\272" }, /* scan line 1 */
{ 'p', "\342\216\273" }, /* scan line 3 */
{ 'q', "\342\224\200" }, /* horizontal line */
{ 'r', "\342\216\274" }, /* scan line 7 */
{ 's', "\342\216\275" }, /* scan line 9 */
{ 't', "\342\224\234" }, /* tee pointing right */
{ 'u', "\342\224\244" }, /* tee pointing left */
{ 'v', "\342\224\264" }, /* tee pointing up */
{ 'w', "\342\224\254" }, /* tee pointing down */
{ 'x', "\342\224\202" }, /* vertical line */
{ 'y', "\342\211\244" }, /* less-than-or-equal-to */
{ 'z', "\342\211\245" }, /* greater-than-or-equal-to */
{ '{', "\317\200" }, /* greek pi */
{ '|', "\342\211\240" }, /* not-equal */
{ '}', "\302\243" }, /* UK pound sign */
{ '~', "\302\267" } /* bullet */
};
/* Table mapping UTF-8 to ACS entries. */
struct tty_acs_reverse_entry {
const char *string;
u_char key;
};
static const struct tty_acs_reverse_entry tty_acs_reverse2[] = {
{ "\302\267", '~' }
};
static const struct tty_acs_reverse_entry tty_acs_reverse3[] = {
{ "\342\224\200", 'q' },
{ "\342\224\201", 'q' },
{ "\342\224\202", 'x' },
{ "\342\224\203", 'x' },
{ "\342\224\214", 'l' },
{ "\342\224\217", 'k' },
{ "\342\224\220", 'k' },
{ "\342\224\223", 'l' },
{ "\342\224\224", 'm' },
{ "\342\224\227", 'm' },
{ "\342\224\230", 'j' },
{ "\342\224\233", 'j' },
{ "\342\224\234", 't' },
{ "\342\224\243", 't' },
{ "\342\224\244", 'u' },
{ "\342\224\253", 'u' },
{ "\342\224\263", 'w' },
{ "\342\224\264", 'v' },
{ "\342\224\273", 'v' },
{ "\342\224\274", 'n' },
{ "\342\225\213", 'n' },
{ "\342\225\220", 'q' },
{ "\342\225\221", 'x' },
{ "\342\225\224", 'l' },
{ "\342\225\227", 'k' },
{ "\342\225\232", 'm' },
{ "\342\225\235", 'j' },
{ "\342\225\240", 't' },
{ "\342\225\243", 'u' },
{ "\342\225\246", 'w' },
{ "\342\225\251", 'v' },
{ "\342\225\254", 'n' },
};
/* UTF-8 double borders. */
static const struct utf8_data tty_acs_double_borders_list[] = {
{ "", 0, 0, 0 },
{ "\342\225\221", 0, 3, 1 }, /* U+2551 */
{ "\342\225\220", 0, 3, 1 }, /* U+2550 */
{ "\342\225\224", 0, 3, 1 }, /* U+2554 */
{ "\342\225\227", 0, 3, 1 }, /* U+2557 */
{ "\342\225\232", 0, 3, 1 }, /* U+255A */
{ "\342\225\235", 0, 3, 1 }, /* U+255D */
{ "\342\225\246", 0, 3, 1 }, /* U+2566 */
{ "\342\225\251", 0, 3, 1 }, /* U+2569 */
{ "\342\225\240", 0, 3, 1 }, /* U+2560 */
{ "\342\225\243", 0, 3, 1 }, /* U+2563 */
{ "\342\225\254", 0, 3, 1 }, /* U+256C */
{ "\302\267", 0, 2, 1 } /* U+00B7 */
};
/* UTF-8 heavy borders. */
static const struct utf8_data tty_acs_heavy_borders_list[] = {
{ "", 0, 0, 0 },
{ "\342\224\203", 0, 3, 1 }, /* U+2503 */
{ "\342\224\201", 0, 3, 1 }, /* U+2501 */
{ "\342\224\217", 0, 3, 1 }, /* U+250F */
{ "\342\224\223", 0, 3, 1 }, /* U+2513 */
{ "\342\224\227", 0, 3, 1 }, /* U+2517 */
{ "\342\224\233", 0, 3, 1 }, /* U+251B */
{ "\342\224\263", 0, 3, 1 }, /* U+2533 */
{ "\342\224\273", 0, 3, 1 }, /* U+253B */
{ "\342\224\243", 0, 3, 1 }, /* U+2523 */
{ "\342\224\253", 0, 3, 1 }, /* U+252B */
{ "\342\225\213", 0, 3, 1 }, /* U+254B */
{ "\302\267", 0, 2, 1 } /* U+00B7 */
};
/* UTF-8 rounded borders. */
static const struct utf8_data tty_acs_rounded_borders_list[] = {
{ "", 0, 0, 0 },
{ "\342\224\202", 0, 3, 1 }, /* U+2502 */
{ "\342\224\200", 0, 3, 1 }, /* U+2500 */
{ "\342\225\255", 0, 3, 1 }, /* U+256D */
{ "\342\225\256", 0, 3, 1 }, /* U+256E */
{ "\342\225\260", 0, 3, 1 }, /* U+2570 */
{ "\342\225\257", 0, 3, 1 }, /* U+256F */
{ "\342\224\263", 0, 3, 1 }, /* U+2533 */
{ "\342\224\273", 0, 3, 1 }, /* U+253B */
{ "\342\224\234", 0, 3, 1 }, /* U+2524 */
{ "\342\224\244", 0, 3, 1 }, /* U+251C */
{ "\342\225\213", 0, 3, 1 }, /* U+254B */
{ "\302\267", 0, 2, 1 } /* U+00B7 */
};
/* Get cell border character for double style. */
const struct utf8_data *
tty_acs_double_borders(int cell_type)
{
return (&tty_acs_double_borders_list[cell_type]);
}
/* Get cell border character for heavy style. */
const struct utf8_data *
tty_acs_heavy_borders(int cell_type)
{
return (&tty_acs_heavy_borders_list[cell_type]);
}
/* Get cell border character for rounded style. */
const struct utf8_data *
tty_acs_rounded_borders(int cell_type)
{
return (&tty_acs_rounded_borders_list[cell_type]);
}
static int
tty_acs_cmp(const void *key, const void *value)
{
const struct tty_acs_entry *entry = value;
int test = *(u_char *)key;
return (test - entry->key);
}
static int
tty_acs_reverse_cmp(const void *key, const void *value)
{
const struct tty_acs_reverse_entry *entry = value;
const char *test = key;
return (strcmp(test, entry->string));
}
/* 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->client->flags & CLIENT_UTF8)
return (0);
return (1);
}
/* Retrieve ACS to output as UTF-8. */
const char *
tty_acs_get(struct tty *tty, u_char ch)
{
const struct tty_acs_entry *entry;
/* 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);
if (entry == NULL)
return (NULL);
return (entry->string);
}
/* Reverse UTF-8 into ACS. */
int
tty_acs_reverse_get(__unused struct tty *tty, const char *s, size_t slen)
{
const struct tty_acs_reverse_entry *table, *entry;
u_int items;
if (slen == 2) {
table = tty_acs_reverse2;
items = nitems(tty_acs_reverse2);
} else if (slen == 3) {
table = tty_acs_reverse3;
items = nitems(tty_acs_reverse3);
} else
return (-1);
entry = bsearch(s, table, items, sizeof table[0], tty_acs_reverse_cmp);
if (entry == NULL)
return (-1);
return (entry->key);
}
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