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Annotation of src/usr.bin/tmux/tty-acs.c, Revision 1.6

1.6     ! nicm        1: /* $OpenBSD: tty-acs.c,v 1.5 2016/10/03 22:52:11 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>
                     22:
                     23: #include "tmux.h"
                     24:
1.5       nicm       25: static int     tty_acs_cmp(const void *, const void *);
1.1       nicm       26:
                     27: /* Table mapping ACS entries to UTF-8. */
                     28: struct tty_acs_entry {
                     29:        u_char           key;
                     30:        const char      *string;
                     31: };
1.5       nicm       32: static const struct tty_acs_entry tty_acs_table[] = {
1.2       nicm       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:        { 'f', "\302\260" },            /* degree symbol */
                     41:        { 'g', "\302\261" },            /* plus/minus */
                     42:        { 'h', "\342\226\222" },        /* board of squares */
                     43:        { 'i', "\342\230\203" },        /* lantern symbol */
                     44:        { 'j', "\342\224\230" },        /* lower right corner */
                     45:        { 'k', "\342\224\220" },        /* upper right corner */
                     46:        { 'l', "\342\224\214" },        /* upper left corner */
                     47:        { 'm', "\342\224\224" },        /* lower left corner */
                     48:        { 'n', "\342\224\274" },        /* large plus or crossover */
                     49:        { 'o', "\342\216\272" },        /* scan line 1 */
                     50:        { 'p', "\342\216\273" },        /* scan line 3 */
                     51:        { 'q', "\342\224\200" },        /* horizontal line */
                     52:        { 'r', "\342\216\274" },        /* scan line 7 */
                     53:        { 's', "\342\216\275" },        /* scan line 9 */
                     54:        { 't', "\342\224\234" },        /* tee pointing right */
                     55:        { 'u', "\342\224\244" },        /* tee pointing left */
                     56:        { 'v', "\342\224\264" },        /* tee pointing up */
                     57:        { 'w', "\342\224\254" },        /* tee pointing down */
                     58:        { 'x', "\342\224\202" },        /* vertical line */
                     59:        { 'y', "\342\211\244" },        /* less-than-or-equal-to */
                     60:        { 'z', "\342\211\245" },        /* greater-than-or-equal-to */
                     61:        { '{', "\317\200" },            /* greek pi */
                     62:        { '|', "\342\211\240" },        /* not-equal */
                     63:        { '}', "\302\243" },            /* UK pound sign */
                     64:        { '~', "\302\267" }             /* bullet */
1.1       nicm       65: };
                     66:
1.5       nicm       67: static int
1.1       nicm       68: tty_acs_cmp(const void *key, const void *value)
                     69: {
                     70:        const struct tty_acs_entry      *entry = value;
                     71:        u_char                           ch;
                     72:
                     73:        ch = *(u_char *) key;
                     74:        return (ch - entry->key);
                     75: }
                     76:
1.6     ! nicm       77: /* Should this terminal use ACS instead of UTF-8 line drawing? */
        !            78: int
        !            79: tty_acs_needed(struct tty *tty)
        !            80: {
        !            81:        if (tty == NULL)
        !            82:                return (0);
        !            83:
        !            84:        /*
        !            85:         * If the U8 flag is present, it marks whether a terminal supports
        !            86:         * UTF-8 and ACS together.
        !            87:         *
        !            88:         * If it is present and zero, we force ACS - this gives users a way to
        !            89:         * turn off UTF-8 line drawing.
        !            90:         *
        !            91:         * If it is nonzero, we can fall through to the default and use UTF-8
        !            92:         * line drawing on UTF-8 terminals.
        !            93:         */
        !            94:        if (tty_term_has(tty->term, TTYC_U8) &&
        !            95:            tty_term_number(tty->term, TTYC_U8) == 0)
        !            96:                return (1);
        !            97:
        !            98:        if (tty->flags & TTY_UTF8)
        !            99:                return (0);
        !           100:        return (1);
        !           101: }
        !           102:
1.1       nicm      103: /* Retrieve ACS to output as a string. */
                    104: const char *
                    105: tty_acs_get(struct tty *tty, u_char ch)
                    106: {
1.6     ! nicm      107:        struct tty_acs_entry    *entry;
1.1       nicm      108:
1.6     ! nicm      109:        /* Use the ACS set instead of UTF-8 if needed. */
        !           110:        if (tty_acs_needed(tty)) {
1.1       nicm      111:                if (tty->term->acs[ch][0] == '\0')
                    112:                        return (NULL);
                    113:                return (&tty->term->acs[ch][0]);
                    114:        }
                    115:
                    116:        /* Otherwise look up the UTF-8 translation. */
1.6     ! nicm      117:        entry = bsearch(&ch, tty_acs_table, nitems(tty_acs_table),
        !           118:            sizeof tty_acs_table[0], tty_acs_cmp);
1.1       nicm      119:        if (entry == NULL)
                    120:                return (NULL);
                    121:        return (entry->string);
                    122: }