Annotation of src/usr.bin/tmux/tty-acs.c, Revision 1.13
1.13 ! nicm 1: /* $OpenBSD: tty-acs.c,v 1.12 2021/10/18 09:15:56 nicm Exp $ */
1.1 nicm 2:
3: /*
1.4 nicm 4: * Copyright (c) 2010 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 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>
1.10 nicm 22: #include <string.h>
1.1 nicm 23:
24: #include "tmux.h"
25:
26: /* Table mapping ACS entries to UTF-8. */
27: struct tty_acs_entry {
1.12 nicm 28: u_char key;
1.1 nicm 29: const char *string;
30: };
1.5 nicm 31: static const struct tty_acs_entry tty_acs_table[] = {
1.2 nicm 32: { '+', "\342\206\222" }, /* arrow pointing right */
33: { ',', "\342\206\220" }, /* arrow pointing left */
34: { '-', "\342\206\221" }, /* arrow pointing up */
35: { '.', "\342\206\223" }, /* arrow pointing down */
36: { '0', "\342\226\256" }, /* solid square block */
37: { '`', "\342\227\206" }, /* diamond */
38: { 'a', "\342\226\222" }, /* checker board (stipple) */
1.7 nicm 39: { 'b', "\342\220\211" },
40: { 'c', "\342\220\214" },
41: { 'd', "\342\220\215" },
42: { 'e', "\342\220\212" },
1.2 nicm 43: { 'f', "\302\260" }, /* degree symbol */
44: { 'g', "\302\261" }, /* plus/minus */
1.7 nicm 45: { 'h', "\342\220\244" },
46: { 'i', "\342\220\213" },
1.2 nicm 47: { 'j', "\342\224\230" }, /* lower right corner */
48: { 'k', "\342\224\220" }, /* upper right corner */
49: { 'l', "\342\224\214" }, /* upper left corner */
50: { 'm', "\342\224\224" }, /* lower left corner */
51: { 'n', "\342\224\274" }, /* large plus or crossover */
52: { 'o', "\342\216\272" }, /* scan line 1 */
53: { 'p', "\342\216\273" }, /* scan line 3 */
54: { 'q', "\342\224\200" }, /* horizontal line */
55: { 'r', "\342\216\274" }, /* scan line 7 */
56: { 's', "\342\216\275" }, /* scan line 9 */
57: { 't', "\342\224\234" }, /* tee pointing right */
58: { 'u', "\342\224\244" }, /* tee pointing left */
59: { 'v', "\342\224\264" }, /* tee pointing up */
60: { 'w', "\342\224\254" }, /* tee pointing down */
61: { 'x', "\342\224\202" }, /* vertical line */
62: { 'y', "\342\211\244" }, /* less-than-or-equal-to */
63: { 'z', "\342\211\245" }, /* greater-than-or-equal-to */
1.12 nicm 64: { '{', "\317\200" }, /* greek pi */
1.2 nicm 65: { '|', "\342\211\240" }, /* not-equal */
66: { '}', "\302\243" }, /* UK pound sign */
67: { '~', "\302\267" } /* bullet */
1.1 nicm 68: };
69:
1.10 nicm 70: /* Table mapping UTF-8 to ACS entries. */
71: struct tty_acs_reverse_entry {
72: const char *string;
73: u_char key;
74: };
75: static const struct tty_acs_reverse_entry tty_acs_reverse2[] = {
76: { "\302\267", '~' }
77: };
78: static const struct tty_acs_reverse_entry tty_acs_reverse3[] = {
79: { "\342\224\200", 'q' },
80: { "\342\224\201", 'q' },
81: { "\342\224\202", 'x' },
82: { "\342\224\203", 'x' },
83: { "\342\224\214", 'l' },
84: { "\342\224\217", 'k' },
85: { "\342\224\220", 'k' },
86: { "\342\224\223", 'l' },
87: { "\342\224\224", 'm' },
88: { "\342\224\227", 'm' },
89: { "\342\224\230", 'j' },
90: { "\342\224\233", 'j' },
91: { "\342\224\234", 't' },
92: { "\342\224\243", 't' },
93: { "\342\224\244", 'u' },
94: { "\342\224\253", 'u' },
95: { "\342\224\263", 'w' },
96: { "\342\224\264", 'v' },
97: { "\342\224\273", 'v' },
98: { "\342\224\274", 'n' },
99: { "\342\225\213", 'n' },
100: { "\342\225\220", 'q' },
101: { "\342\225\221", 'x' },
102: { "\342\225\224", 'l' },
103: { "\342\225\227", 'k' },
104: { "\342\225\232", 'm' },
105: { "\342\225\235", 'j' },
106: { "\342\225\240", 't' },
107: { "\342\225\243", 'u' },
108: { "\342\225\246", 'w' },
109: { "\342\225\251", 'v' },
110: { "\342\225\254", 'n' },
111: };
1.11 nicm 112:
113: /* UTF-8 double borders. */
114: static const struct utf8_data tty_acs_double_borders_list[] = {
115: { "", 0, 0, 0 },
116: { "\342\225\221", 0, 3, 1 }, /* U+2551 */
117: { "\342\225\220", 0, 3, 1 }, /* U+2550 */
118: { "\342\225\224", 0, 3, 1 }, /* U+2554 */
119: { "\342\225\227", 0, 3, 1 }, /* U+2557 */
120: { "\342\225\232", 0, 3, 1 }, /* U+255A */
121: { "\342\225\235", 0, 3, 1 }, /* U+255D */
122: { "\342\225\246", 0, 3, 1 }, /* U+2566 */
123: { "\342\225\251", 0, 3, 1 }, /* U+2569 */
124: { "\342\225\240", 0, 3, 1 }, /* U+2560 */
125: { "\342\225\243", 0, 3, 1 }, /* U+2563 */
126: { "\342\225\254", 0, 3, 1 }, /* U+256C */
1.12 nicm 127: { "\302\267", 0, 2, 1 } /* U+00B7 */
1.11 nicm 128: };
129:
130: /* UTF-8 heavy borders. */
131: static const struct utf8_data tty_acs_heavy_borders_list[] = {
132: { "", 0, 0, 0 },
133: { "\342\224\203", 0, 3, 1 }, /* U+2503 */
134: { "\342\224\201", 0, 3, 1 }, /* U+2501 */
135: { "\342\224\217", 0, 3, 1 }, /* U+250F */
136: { "\342\224\223", 0, 3, 1 }, /* U+2513 */
137: { "\342\224\227", 0, 3, 1 }, /* U+2517 */
138: { "\342\224\233", 0, 3, 1 }, /* U+251B */
139: { "\342\224\263", 0, 3, 1 }, /* U+2533 */
140: { "\342\224\273", 0, 3, 1 }, /* U+253B */
141: { "\342\224\243", 0, 3, 1 }, /* U+2523 */
142: { "\342\224\253", 0, 3, 1 }, /* U+252B */
143: { "\342\225\213", 0, 3, 1 }, /* U+254B */
1.12 nicm 144: { "\302\267", 0, 2, 1 } /* U+00B7 */
1.11 nicm 145: };
146:
147: /* UTF-8 rounded borders. */
148: static const struct utf8_data tty_acs_rounded_borders_list[] = {
1.12 nicm 149: { "", 0, 0, 0 },
150: { "\342\224\202", 0, 3, 1 }, /* U+2502 */
151: { "\342\224\200", 0, 3, 1 }, /* U+2500 */
152: { "\342\225\255", 0, 3, 1 }, /* U+256D */
153: { "\342\225\256", 0, 3, 1 }, /* U+256E */
154: { "\342\225\260", 0, 3, 1 }, /* U+2570 */
155: { "\342\225\257", 0, 3, 1 }, /* U+256F */
156: { "\342\224\263", 0, 3, 1 }, /* U+2533 */
157: { "\342\224\273", 0, 3, 1 }, /* U+253B */
1.13 ! nicm 158: { "\342\224\234", 0, 3, 1 }, /* U+2524 */
! 159: { "\342\224\244", 0, 3, 1 }, /* U+251C */
1.12 nicm 160: { "\342\225\213", 0, 3, 1 }, /* U+254B */
161: { "\302\267", 0, 2, 1 } /* U+00B7 */
1.11 nicm 162: };
163:
164: /* Get cell border character for double style. */
165: const struct utf8_data *
166: tty_acs_double_borders(int cell_type)
167: {
168: return (&tty_acs_double_borders_list[cell_type]);
169: }
170:
171: /* Get cell border character for heavy style. */
172: const struct utf8_data *
173: tty_acs_heavy_borders(int cell_type)
174: {
175: return (&tty_acs_heavy_borders_list[cell_type]);
176: }
177:
178: /* Get cell border character for rounded style. */
179: const struct utf8_data *
180: tty_acs_rounded_borders(int cell_type)
181: {
182: return (&tty_acs_rounded_borders_list[cell_type]);
183: }
1.10 nicm 184:
1.5 nicm 185: static int
1.1 nicm 186: tty_acs_cmp(const void *key, const void *value)
187: {
188: const struct tty_acs_entry *entry = value;
1.10 nicm 189: int test = *(u_char *)key;
1.1 nicm 190:
1.10 nicm 191: return (test - entry->key);
192: }
193:
194: static int
195: tty_acs_reverse_cmp(const void *key, const void *value)
196: {
197: const struct tty_acs_reverse_entry *entry = value;
198: const char *test = key;
199:
200: return (strcmp(test, entry->string));
1.1 nicm 201: }
202:
1.6 nicm 203: /* Should this terminal use ACS instead of UTF-8 line drawing? */
204: int
205: tty_acs_needed(struct tty *tty)
206: {
207: if (tty == NULL)
208: return (0);
209:
210: /*
211: * If the U8 flag is present, it marks whether a terminal supports
212: * UTF-8 and ACS together.
213: *
214: * If it is present and zero, we force ACS - this gives users a way to
215: * turn off UTF-8 line drawing.
216: *
217: * If it is nonzero, we can fall through to the default and use UTF-8
218: * line drawing on UTF-8 terminals.
219: */
220: if (tty_term_has(tty->term, TTYC_U8) &&
221: tty_term_number(tty->term, TTYC_U8) == 0)
222: return (1);
223:
1.9 nicm 224: if (tty->client->flags & CLIENT_UTF8)
1.6 nicm 225: return (0);
226: return (1);
227: }
228:
1.10 nicm 229: /* Retrieve ACS to output as UTF-8. */
1.1 nicm 230: const char *
231: tty_acs_get(struct tty *tty, u_char ch)
232: {
1.10 nicm 233: const struct tty_acs_entry *entry;
1.1 nicm 234:
1.6 nicm 235: /* Use the ACS set instead of UTF-8 if needed. */
236: if (tty_acs_needed(tty)) {
1.1 nicm 237: if (tty->term->acs[ch][0] == '\0')
238: return (NULL);
239: return (&tty->term->acs[ch][0]);
240: }
241:
242: /* Otherwise look up the UTF-8 translation. */
1.6 nicm 243: entry = bsearch(&ch, tty_acs_table, nitems(tty_acs_table),
244: sizeof tty_acs_table[0], tty_acs_cmp);
1.1 nicm 245: if (entry == NULL)
246: return (NULL);
247: return (entry->string);
1.10 nicm 248: }
249:
250: /* Reverse UTF-8 into ACS. */
251: int
252: tty_acs_reverse_get(__unused struct tty *tty, const char *s, size_t slen)
253: {
254: const struct tty_acs_reverse_entry *table, *entry;
255: u_int items;
256:
257: if (slen == 2) {
258: table = tty_acs_reverse2;
259: items = nitems(tty_acs_reverse2);
260: } else if (slen == 3) {
261: table = tty_acs_reverse3;
262: items = nitems(tty_acs_reverse3);
263: } else
264: return (-1);
265: entry = bsearch(s, table, items, sizeof table[0], tty_acs_reverse_cmp);
266: if (entry == NULL)
267: return (-1);
268: return (entry->key);
1.1 nicm 269: }
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