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/* $OpenBSD: tty-acs.c,v 1.7 2019/05/17 05:48:25 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 "tmux.h"
static int tty_acs_cmp(const void *, const void *);
/* 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 */
};
static int
tty_acs_cmp(const void *key, const void *value)
{
const struct tty_acs_entry *entry = value;
u_char ch;
ch = *(u_char *) key;
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;
/* 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);
}
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