summaryrefslogtreecommitdiffstats
path: root/osdep/terminal-unix.c
blob: 954c13904fe86e9248f6b04dfb737de03debab0f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
/*
 * Based on GyS-TermIO v2.0 (for GySmail v3) (copyright (C) 1999 A'rpi/ESP-team)
 *
 * This file is part of mpv.
 *
 * mpv is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * mpv is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <pthread.h>
#include <assert.h>

#include <termios.h>
#include <unistd.h>

#include "osdep/io.h"
#include "osdep/threads.h"
#include "osdep/polldev.h"

#include "common/common.h"
#include "misc/bstr.h"
#include "input/input.h"
#include "input/keycodes.h"
#include "misc/ctype.h"
#include "terminal.h"

static volatile struct termios tio_orig;
static volatile int tio_orig_set;

static int tty_in = -1, tty_out = -1;

struct key_entry {
    const char *seq;
    int mpkey;
    // If this is not NULL, then if seq is matched as unique prefix, the
    // existing sequence is replaced by the following string. Matching
    // continues normally, and mpkey is or-ed into the final result.
    const char *replace;
};

static const struct key_entry keys[] = {
    {"\010", MP_KEY_BS},
    {"\011", MP_KEY_TAB},
    {"\012", MP_KEY_ENTER},
    {"\177", MP_KEY_BS},

    {"\033[1~", MP_KEY_HOME},
    {"\033[2~", MP_KEY_INS},
    {"\033[3~", MP_KEY_DEL},
    {"\033[4~", MP_KEY_END},
    {"\033[5~", MP_KEY_PGUP},
    {"\033[6~", MP_KEY_PGDWN},
    {"\033[7~", MP_KEY_HOME},
    {"\033[8~", MP_KEY_END},

    {"\033[11~", MP_KEY_F+1},
    {"\033[12~", MP_KEY_F+2},
    {"\033[13~", MP_KEY_F+3},
    {"\033[14~", MP_KEY_F+4},
    {"\033[15~", MP_KEY_F+5},
    {"\033[17~", MP_KEY_F+6},
    {"\033[18~", MP_KEY_F+7},
    {"\033[19~", MP_KEY_F+8},
    {"\033[20~", MP_KEY_F+9},
    {"\033[21~", MP_KEY_F+10},
    {"\033[23~", MP_KEY_F+11},
    {"\033[24~", MP_KEY_F+12},

    {"\033[A", MP_KEY_UP},
    {"\033[B", MP_KEY_DOWN},
    {"\033[C", MP_KEY_RIGHT},
    {"\033[D", MP_KEY_LEFT},
    {"\033[E", MP_KEY_KP5},
    {"\033[F", MP_KEY_END},
    {"\033[H", MP_KEY_HOME},

    {"\033[[A", MP_KEY_F+1},
    {"\033[[B", MP_KEY_F+2},
    {"\033[[C", MP_KEY_F+3},
    {"\033[[D", MP_KEY_F+4},
    {"\033[[E", MP_KEY_F+5},

    {"\033OE", MP_KEY_KP5}, // mintty?
    {"\033OM", MP_KEY_KPENTER},
    {"\033OP", MP_KEY_F+1},
    {"\033OQ", MP_KEY_F+2},
    {"\033OR", MP_KEY_F+3},
    {"\033OS", MP_KEY_F+4},

    {"\033Oa", MP_KEY_UP | MP_KEY_MODIFIER_CTRL}, // urxvt
    {"\033Ob", MP_KEY_DOWN | MP_KEY_MODIFIER_CTRL},
    {"\033Oc", MP_KEY_RIGHT | MP_KEY_MODIFIER_CTRL},
    {"\033Od", MP_KEY_LEFT | MP_KEY_MODIFIER_CTRL},
    {"\033Oj", '*'}, // also keypad, but we don't have separate codes for them
    {"\033Ok", '+'},
    {"\033Om", '-'},
    {"\033On", MP_KEY_KPDEC},
    {"\033Oo", '/'},
    {"\033Op", MP_KEY_KP0},
    {"\033Oq", MP_KEY_KP1},
    {"\033Or", MP_KEY_KP2},
    {"\033Os", MP_KEY_KP3},
    {"\033Ot", MP_KEY_KP4},
    {"\033Ou", MP_KEY_KP5},
    {"\033Ov", MP_KEY_KP6},
    {"\033Ow", MP_KEY_KP7},
    {"\033Ox", MP_KEY_KP8},
    {"\033Oy", MP_KEY_KP9},

    {"\033[a", MP_KEY_UP | MP_KEY_MODIFIER_SHIFT}, // urxvt
    {"\033[b", MP_KEY_DOWN | MP_KEY_MODIFIER_SHIFT},
    {"\033[c", MP_KEY_RIGHT | MP_KEY_MODIFIER_SHIFT},
    {"\033[d", MP_KEY_LEFT | MP_KEY_MODIFIER_SHIFT},
    {"\033[2^", MP_KEY_INS | MP_KEY_MODIFIER_CTRL},
    {"\033[3^", MP_KEY_DEL | MP_KEY_MODIFIER_CTRL},
    {"\033[5^", MP_KEY_PGUP | MP_KEY_MODIFIER_CTRL},
    {"\033[6^", MP_KEY_PGDWN | MP_KEY_MODIFIER_CTRL},
    {"\033[7^", MP_KEY_HOME | MP_KEY_MODIFIER_CTRL},
    {"\033[8^", MP_KEY_END | MP_KEY_MODIFIER_CTRL},

    {"\033[1;2", MP_KEY_MODIFIER_SHIFT, .replace = "\033["}, // xterm
    {"\033[1;3", MP_KEY_MODIFIER_ALT, .replace = "\033["},
    {"\033[1;5", MP_KEY_MODIFIER_CTRL, .replace = "\033["},
    {"\033[1;4", MP_KEY_MODIFIER_ALT | MP_KEY_MODIFIER_SHIFT, .replace = "\033["},
    {"\033[1;6", MP_KEY_MODIFIER_CTRL | MP_KEY_MODIFIER_SHIFT, .replace = "\033["},
    {"\033[1;7", MP_KEY_MODIFIER_CTRL | MP_KEY_MODIFIER_ALT, .replace = "\033["},
    {"\033[1;8",
     MP_KEY_MODIFIER_CTRL | MP_KEY_MODIFIER_ALT | MP_KEY_MODIFIER_SHIFT,
     .replace = "\033["},

    {"\033[29~", MP_KEY_MENU},
    {"\033[Z", MP_KEY_TAB | MP_KEY_MODIFIER_SHIFT},

    {0}
};

#define BUF_LEN 256

struct termbuf {
    unsigned char b[BUF_LEN];
    int len;
    int mods;
};

static void skip_buf(struct termbuf *b, unsigned int count)
{
    assert(count <= b->len);

    memmove(&b->b[0], &b->b[count], b->len - count);
    b->len -= count;
    b->mods = 0;
}

static struct termbuf buf;

static bool getch2(struct input_ctx *input_ctx)
{
    int retval = read(tty_in, &buf.b[buf.len], BUF_LEN - buf.len);
    /* Return false on EOF to stop running select() on the FD, as it'd
     * trigger all the time. Note that it's possible to get temporary
     * EOF on terminal if the user presses ctrl-d, but that shouldn't
     * happen if the terminal state change done in terminal_init()
     * works.
     */
    if (retval == 0)
        return false;
    if (retval == -1)
        return errno != EBADF && errno != EINVAL;
    buf.len += retval;

    while (buf.len) {
        int utf8_len = bstr_parse_utf8_code_length(buf.b[0]);
        if (utf8_len > 1) {
            if (buf.len < utf8_len)
                goto read_more;

            mp_input_put_key_utf8(input_ctx, buf.mods, (bstr){buf.b, utf8_len});
            skip_buf(&buf, utf8_len);
            continue;
        }

        const struct key_entry *match = NULL; // may be a partial match
        for (int n = 0; keys[n].seq; n++) {
            const struct key_entry *e = &keys[n];
            if (memcmp(e->seq, buf.b, MPMIN(buf.len, strlen(e->seq))) == 0) {
                if (match)
                    goto read_more; /* need more bytes to disambiguate */
                match = e;
            }
        }

        if (!match) { // normal or unknown key
            if (buf.b[0] == '\033') {
                skip_buf(&buf, 1);
                if (buf.len > 0 && mp_isalnum(buf.b[0])) { // meta+normal key
                    mp_input_put_key(input_ctx, buf.b[0] | MP_KEY_MODIFIER_ALT);
                    skip_buf(&buf, 1);
                } else if (buf.len == 1 && buf.b[0] == '\033') {
                    mp_input_put_key(input_ctx, MP_KEY_ESC);
                    skip_buf(&buf, 1);
                } else {
                    // Throw it away. Typically, this will be a complete,
                    // unsupported sequence, and dropping this will skip it.
                    skip_buf(&buf, buf.len);
                }
            } else {
                mp_input_put_key(input_ctx, buf.b[0]);
                skip_buf(&buf, 1);
            }
            continue;
        }

        int seq_len = strlen(match->seq);
        if (seq_len > buf.len)
            goto read_more; /* partial match */

        if (match->replace) {
            int rep = strlen(match->replace);
            assert(rep <= seq_len);
            memcpy(buf.b, match->replace, rep);
            memmove(buf.b + rep, buf.b + seq_len, buf.len - seq_len);
            buf.len = rep + buf.len - seq_len;
            buf.mods |= match->mpkey;
            continue;
        }

        mp_input_put_key(input_ctx, buf.mods | match->mpkey);
        skip_buf(&buf, seq_len);
    }

read_more:  /* need more bytes */
    return true;
}

static volatile int getch2_active  = 0;
static volatile int getch2_enabled = 0;
static bool read_terminal;

static void enable_kx(bool enable)
{
    // This check is actually always true, as enable_kx calls are all guarded
    // by read_terminal, which is true only if both stdin and stdout are a
    // tty. Note that stderr being redirected away has no influence over mpv's
    // I/O handling except for disabling the terminal OSD, and thus stderr
    // shouldn't be relied on here either.
    if (isatty(tty_out)) {
        char *cmd = enable ? "\033=" : "\033>";
        (void)write(tty_out, cmd, strlen(cmd));
    }
}

static void do_activate_getch2(void)
{
    if (getch2_active || !read_terminal)
        return;

    enable_kx(true);

    struct termios tio_new;
    tcgetattr(tty_in,&tio_new);

    if (!tio_orig_set) {
        tio_orig = tio_new;
        tio_orig_set = 1;
    }

    tio_new.c_lflag &= ~(ICANON|ECHO); /* Clear ICANON and ECHO. */
    tio_new.c_cc[VMIN] = 1;
    tio_new.c_cc[VTIME] = 0;
    tcsetattr(tty_in,TCSANOW,&tio_new);

    getch2_active = 1;
}

static void do_deactivate_getch2(void)
{
    if (!getch2_active)
        return;

    enable_kx(false);

    if (tio_orig_set) {
        // once set, it will never be set again
        // so we can cast away volatile here
        tcsetattr(tty_in, TCSANOW, (const struct termios *) &tio_orig);
    }

    getch2_active = 0;
}

// sigaction wrapper
static int setsigaction(int signo, void (*handler) (int),
                        int flags, bool do_mask)
{
    struct sigaction sa;
    sa.sa_handler = handler;

    if(do_mask)
        sigfillset(&sa.sa_mask);
    else
        sigemptyset(&sa.sa_mask);

    sa.sa_flags = flags | SA_RESTART;
    return sigaction(signo, &sa, NULL);
}

static void getch2_poll(void)
{
    if (!getch2_enabled)
        return;

    // check if stdin is in the foreground process group
    int newstatus = (tcgetpgrp(tty_in) == getpgrp());

    // and activate getch2 if it is, deactivate otherwise
    if (newstatus)
        do_activate_getch2();
    else
        do_deactivate_getch2();
}

static void stop_sighandler(int signum)
{
    do_deactivate_getch2();

    // note: for this signal, we use SA_RESETHAND but do NOT mask signals
    // so this will invoke the default handler
    raise(SIGTSTP);
}

static void continue_sighandler(int signum)
{
    // SA_RESETHAND has reset SIGTSTP, so we need to restore it here
    setsigaction(SIGTSTP, stop_sighandler, SA_RESETHAND, false);

    getch2_poll();
}

static pthread_t input_thread;
static struct input_ctx *input_ctx;
static int death_pipe[2] = {-1, -1};

static void close_death_pipe(void)
{
    for (int n = 0; n < 2; n++) {
        if (death_pipe[n] >= 0)
            close(death_pipe[n]);
        death_pipe[n] = -1;
    }
}

static void close_tty(void)
{
    if (tty_in >= 0 && tty_in != STDIN_FILENO)
        close(tty_in);

    tty_in = tty_out = -1;
}

static void quit_request_sighandler(int signum)
{
    do_deactivate_getch2();

    (void)write(death_pipe[1], &(char){1}, 1);
}

static void *terminal_thread(void *ptr)
{
    mpthread_set_name("terminal");
    bool stdin_ok = read_terminal; // if false, we still wait for SIGTERM
    while (1) {
        getch2_poll();
        struct pollfd fds[2] = {
            { .events = POLLIN, .fd = death_pipe[0] },
            { .events = POLLIN, .fd = tty_in }
        };
        polldev(fds, stdin_ok ? 2 : 1, -1);
        if (fds[0].revents)
            break;
        if (fds[1].revents) {
            if (!getch2(input_ctx))
                break;
        }
    }
    char c;
    bool quit = read(death_pipe[0], &c, 1) == 1 && c == 1;
    // Important if we received SIGTERM, rather than regular quit.
    if (quit) {
        struct mp_cmd *cmd = mp_input_parse_cmd(input_ctx, bstr0("quit 4"), "");
        if (cmd)
            mp_input_queue_cmd(input_ctx, cmd);
    }
    return NULL;
}

void terminal_setup_getch(struct input_ctx *ictx)
{
    if (!getch2_enabled || input_ctx)
        return;

    if (mp_make_wakeup_pipe(death_pipe) < 0)
        return;

    // Disable reading from the terminal even if stdout is not a tty, to make
    //   mpv ... | less
    // do the right thing.
    read_terminal = isatty(tty_in) && isatty(STDOUT_FILENO);

    input_ctx = ictx;

    if (pthread_create(&input_thread, NULL, terminal_thread, NULL)) {
        input_ctx = NULL;
        close_death_pipe();
        close_tty();
        return;
    }

    setsigaction(SIGINT,  quit_request_sighandler, SA_RESETHAND, false);
    setsigaction(SIGQUIT, quit_request_sighandler, SA_RESETHAND, false);
    setsigaction(SIGTERM, quit_request_sighandler, SA_RESETHAND, false);
}

void terminal_uninit(void)
{
    if (!getch2_enabled)
        return;

    // restore signals
    setsigaction(SIGCONT, SIG_DFL, 0, false);
    setsigaction(SIGTSTP, SIG_DFL, 0, false);
    setsigaction(SIGINT,  SIG_DFL, 0, false);
    setsigaction(SIGQUIT, SIG_DFL, 0, false);
    setsigaction(SIGTERM, SIG_DFL, 0, false);
    setsigaction(SIGTTIN, SIG_DFL, 0, false);
    setsigaction(SIGTTOU, SIG_DFL, 0, false);

    if (input_ctx) {
        (void)write(death_pipe[1], &(char){0}, 1);
        pthread_join(input_thread, NULL);
        close_death_pipe();
        input_ctx = NULL;
    }

    do_deactivate_getch2();
    close_tty();

    getch2_enabled = 0;
    read_terminal = false;
}

bool terminal_in_background(void)
{
    return read_terminal && tcgetpgrp(STDERR_FILENO) != getpgrp();
}

void terminal_get_size(int *w, int *h)
{
    struct winsize ws;
    if (ioctl(tty_in, TIOCGWINSZ, &ws) < 0 || !ws.ws_row || !ws.ws_col)
        return;

    *w = ws.ws_col;
    *h = ws.ws_row;
}

void terminal_init(void)
{
    assert(!getch2_enabled);
    getch2_enabled = 1;

    tty_in = tty_out = open("/dev/tty", O_RDWR | O_CLOEXEC);
    if (tty_in < 0) {
        tty_in = STDIN_FILENO;
        tty_out = STDOUT_FILENO;
    }

    // handlers to fix terminal settings
    setsigaction(SIGCONT, continue_sighandler, 0, true);
    setsigaction(SIGTSTP, stop_sighandler, SA_RESETHAND, false);
    setsigaction(SIGTTIN, SIG_IGN, 0, true);
    setsigaction(SIGTTOU, SIG_IGN, 0, true);

    getch2_poll();
}