1/* $OpenBSD$ */
2
3/*
4 * Copyright (c) 2010 Nicholas Marriott <[email protected]>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20
21#include <stdlib.h>
22
23#include "tmux.h"
24
25static int tty_acs_cmp(const void *, const void *);
26
27/* Table mapping ACS entries to UTF-8. */
28struct tty_acs_entry {
29 u_char key;
30 const char *string;
31};
32static const struct tty_acs_entry tty_acs_table[] = {
33 { '+', "\342\206\222" }, /* arrow pointing right */
34 { ',', "\342\206\220" }, /* arrow pointing left */
35 { '-', "\342\206\221" }, /* arrow pointing up */
36 { '.', "\342\206\223" }, /* arrow pointing down */
37 { '0', "\342\226\256" }, /* solid square block */
38 { '`', "\342\227\206" }, /* diamond */
39 { 'a', "\342\226\222" }, /* checker board (stipple) */
40 { 'b', "\342\220\211" },
41 { 'c', "\342\220\214" },
42 { 'd', "\342\220\215" },
43 { 'e', "\342\220\212" },
44 { 'f', "\302\260" }, /* degree symbol */
45 { 'g', "\302\261" }, /* plus/minus */
46 { 'h', "\342\220\244" },
47 { 'i', "\342\220\213" },
48 { 'j', "\342\224\230" }, /* lower right corner */
49 { 'k', "\342\224\220" }, /* upper right corner */
50 { 'l', "\342\224\214" }, /* upper left corner */
51 { 'm', "\342\224\224" }, /* lower left corner */
52 { 'n', "\342\224\274" }, /* large plus or crossover */
53 { 'o', "\342\216\272" }, /* scan line 1 */
54 { 'p', "\342\216\273" }, /* scan line 3 */
55 { 'q', "\342\224\200" }, /* horizontal line */
56 { 'r', "\342\216\274" }, /* scan line 7 */
57 { 's', "\342\216\275" }, /* scan line 9 */
58 { 't', "\342\224\234" }, /* tee pointing right */
59 { 'u', "\342\224\244" }, /* tee pointing left */
60 { 'v', "\342\224\264" }, /* tee pointing up */
61 { 'w', "\342\224\254" }, /* tee pointing down */
62 { 'x', "\342\224\202" }, /* vertical line */
63 { 'y', "\342\211\244" }, /* less-than-or-equal-to */
64 { 'z', "\342\211\245" }, /* greater-than-or-equal-to */
65 { '{', "\317\200" }, /* greek pi */
66 { '|', "\342\211\240" }, /* not-equal */
67 { '}', "\302\243" }, /* UK pound sign */
68 { '~', "\302\267" } /* bullet */
69};
70
71static int
72tty_acs_cmp(const void *key, const void *value)
73{
74 const struct tty_acs_entry *entry = value;
75 u_char ch;
76
77 ch = *(u_char *) key;
78 return (ch - entry->key);
79}
80
81/* Should this terminal use ACS instead of UTF-8 line drawing? */
82int
83tty_acs_needed(struct tty *tty)
84{
85 if (tty == NULL)
86 return (0);
87
88 /*
89 * If the U8 flag is present, it marks whether a terminal supports
90 * UTF-8 and ACS together.
91 *
92 * If it is present and zero, we force ACS - this gives users a way to
93 * turn off UTF-8 line drawing.
94 *
95 * If it is nonzero, we can fall through to the default and use UTF-8
96 * line drawing on UTF-8 terminals.
97 */
98 if (tty_term_has(tty->term, TTYC_U8) &&
99 tty_term_number(tty->term, TTYC_U8) == 0)
100 return (1);
101
102 if (tty->flags & TTY_UTF8)
103 return (0);
104 return (1);
105}
106
107/* Retrieve ACS to output as a string. */
108const char *
109tty_acs_get(struct tty *tty, u_char ch)
110{
111 struct tty_acs_entry *entry;
112
113 /* Use the ACS set instead of UTF-8 if needed. */
114 if (tty_acs_needed(tty)) {
115 if (tty->term->acs[ch][0] == '\0')
116 return (NULL);
117 return (&tty->term->acs[ch][0]);
118 }
119
120 /* Otherwise look up the UTF-8 translation. */
121 entry = bsearch(&ch, tty_acs_table, nitems(tty_acs_table),
122 sizeof tty_acs_table[0], tty_acs_cmp);
123 if (entry == NULL)
124 return (NULL);
125 return (entry->string);
126}
127