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mpv/osdep/terminal-unix.c
Kacper Michajłow 13ed292ab0 terminal: don't print escape sequence if not tty
2024-01-15 10:39:42 +01:00

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/*
* 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 <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <assert.h>
#include <termios.h>
#include <unistd.h>
#include "osdep/io.h"
#include "osdep/threads.h"
#include "osdep/poll_wrapper.h"
#include "common/common.h"
#include "misc/bstr.h"
#include "input/input.h"
#include "input/keycodes.h"
#include "misc/ctype.h"
#include "terminal.h"
// Timeout in ms after which the (normally ambiguous) ESC key is detected.
#define ESC_TIMEOUT 100
// Timeout in ms after which the poll for input is aborted. The FG/BG state is
// tested before every wait, and a positive value allows reactivating input
// processing when mpv is brought to the foreground while it was running in the
// background. In such a situation, an infinite timeout (-1) will keep mpv
// waiting for input without realizing the terminal state changed - and thus
// buffer all keypresses until ENTER is pressed.
#define INPUT_TIMEOUT 1000
static struct termios tio_orig;
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},
{"\033OA", MP_KEY_UP},
{"\033OB", MP_KEY_DOWN},
{"\033OC", MP_KEY_RIGHT},
{"\033OD", MP_KEY_LEFT},
{"\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 void process_input(struct input_ctx *input_ctx, bool timeout)
{
while (buf.len) {
// Lone ESC is ambiguous, so accept it only after a timeout.
if (timeout &&
((buf.len == 1 && buf.b[0] == '\033') ||
(buf.len > 1 && buf.b[0] == '\033' && buf.b[1] == '\033')))
{
mp_input_put_key(input_ctx, MP_KEY_ESC);
skip_buf(&buf, 1);
}
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
int mods = 0;
if (buf.b[0] == '\033') {
if (buf.len > 1 && buf.b[1] == '[') {
// unknown CSI sequence. wait till it completes
for (int i = 2; i < buf.len; i++) {
if (buf.b[i] >= 0x40 && buf.b[i] <= 0x7E) {
skip_buf(&buf, i+1);
continue; // complete - throw it away
}
}
goto read_more; // not yet complete
}
// non-CSI esc sequence
skip_buf(&buf, 1);
if (buf.len > 0 && buf.b[0] > 0 && buf.b[0] < 127) {
// meta+normal key
mods |= MP_KEY_MODIFIER_ALT;
} else {
// Throw it away. Typically, this will be a complete,
// unsupported sequence, and dropping this will skip it.
skip_buf(&buf, buf.len);
continue;
}
}
unsigned char c = buf.b[0];
skip_buf(&buf, 1);
if (c < 32) {
// 1..26 is ^A..^Z, and 27..31 is ^3..^7
c = c <= 26 ? (c + 'a' - 1) : (c + '3' - 27);
mods |= MP_KEY_MODIFIER_CTRL;
}
mp_input_put_key(input_ctx, c | mods);
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 */
}
static int getch2_active = 0;
static 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);
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);
tcsetattr(tty_in, TCSANOW, &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 mp_thread input_thread;
static struct input_ctx *input_ctx;
static int death_pipe[2] = {-1, -1};
enum { PIPE_STOP, PIPE_CONT };
static int stop_cont_pipe[2] = {-1, -1};
static void stop_cont_sighandler(int signum)
{
int saved_errno = errno;
char sig = signum == SIGCONT ? PIPE_CONT : PIPE_STOP;
(void)write(stop_cont_pipe[1], &sig, 1);
errno = saved_errno;
}
static void safe_close(int *p)
{
if (*p >= 0)
close(*p);
*p = -1;
}
static void close_sig_pipes(void)
{
for (int n = 0; n < 2; n++) {
safe_close(&death_pipe[n]);
safe_close(&stop_cont_pipe[n]);
}
}
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)
{
int saved_errno = errno;
(void)write(death_pipe[1], &(char){1}, 1);
errno = saved_errno;
}
static MP_THREAD_VOID terminal_thread(void *ptr)
{
mp_thread_set_name("terminal/input");
bool stdin_ok = read_terminal; // if false, we still wait for SIGTERM
while (1) {
getch2_poll();
struct pollfd fds[3] = {
{ .events = POLLIN, .fd = death_pipe[0] },
{ .events = POLLIN, .fd = stop_cont_pipe[0] },
{ .events = POLLIN, .fd = tty_in }
};
/*
* if the process isn't in foreground process group, then on macos
* polldev() doesn't rest and gets into 100% cpu usage (see issue #11795)
* with read() returning EIO. but we shouldn't quit on EIO either since
* the process might be foregrounded later.
*
* so just avoid poll-ing tty_in when we know the process is not in the
* foreground. there's a small race window, but the timeout will take
* care of it so it's fine.
*/
bool is_fg = tcgetpgrp(tty_in) == getpgrp();
int r = polldev(fds, stdin_ok && is_fg ? 3 : 2, buf.len ? ESC_TIMEOUT : INPUT_TIMEOUT);
if (fds[0].revents) {
do_deactivate_getch2();
break;
}
if (fds[1].revents & POLLIN) {
int8_t c = -1;
(void)read(stop_cont_pipe[0], &c, 1);
if (c == PIPE_STOP) {
do_deactivate_getch2();
if (isatty(STDERR_FILENO)) {
(void)write(STDERR_FILENO, TERM_ESC_RESTORE_CURSOR,
sizeof(TERM_ESC_RESTORE_CURSOR) - 1);
}
// trying to reset SIGTSTP handler to default and raise it will
// result in a race and there's no other way to invoke the
// default handler. so just invoke SIGSTOP since it's
// effectively the same thing.
raise(SIGSTOP);
} else if (c == PIPE_CONT) {
getch2_poll();
}
}
if (fds[2].revents) {
int retval = read(tty_in, &buf.b[buf.len], BUF_LEN - buf.len);
if (!retval || (retval == -1 && errno != EINTR && errno != EAGAIN && errno != EIO))
break; // EOF/closed
if (retval > 0) {
buf.len += retval;
process_input(input_ctx, false);
}
}
if (r == 0)
process_input(input_ctx, true);
}
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);
}
MP_THREAD_RETURN();
}
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 (mp_thread_create(&input_thread, terminal_thread, NULL)) {
input_ctx = NULL;
close_sig_pipes();
close_tty();
return;
}
setsigaction(SIGINT, quit_request_sighandler, SA_RESETHAND, false);
setsigaction(SIGQUIT, quit_request_sighandler, 0, true);
setsigaction(SIGTERM, quit_request_sighandler, 0, true);
}
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);
mp_thread_join(input_thread);
close_sig_pipes();
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_get_size2(int *rows, int *cols, int *px_width, int *px_height)
{
struct winsize ws;
if (ioctl(tty_in, TIOCGWINSZ, &ws) < 0 || !ws.ws_row || !ws.ws_col
|| !ws.ws_xpixel || !ws.ws_ypixel)
return;
*rows = ws.ws_row;
*cols = ws.ws_col;
*px_width = ws.ws_xpixel;
*px_height = ws.ws_ypixel;
}
void terminal_init(void)
{
assert(!getch2_enabled);
getch2_enabled = 1;
if (mp_make_wakeup_pipe(stop_cont_pipe) < 0) {
getch2_enabled = 0;
return;
}
tty_in = tty_out = open("/dev/tty", O_RDWR | O_CLOEXEC);
if (tty_in < 0) {
tty_in = STDIN_FILENO;
tty_out = STDOUT_FILENO;
}
tcgetattr(tty_in, &tio_orig);
// handlers to fix terminal settings
setsigaction(SIGCONT, stop_cont_sighandler, 0, true);
setsigaction(SIGTSTP, stop_cont_sighandler, 0, true);
setsigaction(SIGTTIN, SIG_IGN, 0, true);
setsigaction(SIGTTOU, SIG_IGN, 0, true);
getch2_poll();
}
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