tty-acs.c

   1 /* $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2010 Nicholas Marriott <nicholas.marriott@gmail.com>
   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 #include <string.h>
  23
  24 #include "tmux.h"
  25
  26 /* Table mapping ACS entries to UTF-8. */
  27 struct tty_acs_entry {
  28         u_char           key;
  29         const char      *string;
  30 };
  31 static const struct tty_acs_entry tty_acs_table[] = {
  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) */
  39         { 'b', "\342\220\211" },
  40         { 'c', "\342\220\214" },
  41         { 'd', "\342\220\215" },
  42         { 'e', "\342\220\212" },
  43         { 'f', "\302\260" },            /* degree symbol */
  44         { 'g', "\302\261" },            /* plus/minus */
  45         { 'h', "\342\220\244" },
  46         { 'i', "\342\220\213" },
  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 */
  64         { '{', "\317\200" },            /* greek pi */
  65         { '|', "\342\211\240" },        /* not-equal */
  66         { '}', "\302\243" },            /* UK pound sign */
  67         { '~', "\302\267" }             /* bullet */
  68 };
  69
  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 };
 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 */
 127         { "\302\267",     0, 2, 1 }  /* U+00B7 */
 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 */
 144         { "\302\267",     0, 2, 1 }  /* U+00B7 */
 145 };
 146
 147 /* UTF-8 rounded borders. */
 148 static const struct utf8_data tty_acs_rounded_borders_list[] = {
 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 */
 158         { "\342\224\234", 0, 3, 1 }, /* U+2524 */
 159         { "\342\224\244", 0, 3, 1 }, /* U+251C */
 160         { "\342\225\213", 0, 3, 1 }, /* U+254B */
 161         { "\302\267",     0, 2, 1 }  /* U+00B7 */
 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 }
 184
 185 static int
 186 tty_acs_cmp(const void *key, const void *value)
 187 {
 188         const struct tty_acs_entry      *entry = value;
 189         int                              test = *(u_char *)key;
 190
 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));
 201 }
 202
 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
 224         if (tty->client->flags & CLIENT_UTF8)
 225                 return (0);
 226         return (1);
 227 }
 228
 229 /* Retrieve ACS to output as UTF-8. */
 230 const char *
 231 tty_acs_get(struct tty *tty, u_char ch)
 232 {
 233         const struct tty_acs_entry      *entry;
 234
 235         /* Use the ACS set instead of UTF-8 if needed. */
 236         if (tty_acs_needed(tty)) {
 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. */
 243         entry = bsearch(&ch, tty_acs_table, nitems(tty_acs_table),
 244             sizeof tty_acs_table[0], tty_acs_cmp);
 245         if (entry == NULL)
 246                 return (NULL);
 247         return (entry->string);
 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);
 269 }