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mpv/osdep/getch2.c

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/*
* GyS-TermIO v2.0 (for GySmail v3)
* a very small replacement of ncurses library
*
* copyright (C) 1999 A'rpi/ESP-team
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include <sys/ioctl.h>
#ifdef HAVE_TERMIOS
#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif
#ifdef HAVE_SYS_TERMIOS_H
#include <sys/termios.h>
#endif
#endif
#include <unistd.h>
#include "mpvcore/mp_common.h"
#include "mpvcore/bstr.h"
#include "mpvcore/input/input.h"
#include "mpvcore/input/keycodes.h"
#include "getch2.h"
#ifdef HAVE_TERMIOS
static volatile struct termios tio_orig;
static volatile int tio_orig_set;
#endif
int screen_width = 80;
int screen_height = 24;
char * erase_to_end_of_line = NULL;
typedef struct {
char *cap;
int len;
int code;
char chars[8];
} keycode_st;
typedef struct {
keycode_st *map;
int len;
int cap;
} keycode_map;
static keycode_map getch2_keys;
#ifdef HAVE_TERMCAP
static char *term_rmkx = NULL;
static char *term_smkx = NULL;
#ifdef HAVE_TERMINFO
#include <curses.h>
#endif
#include <term.h>
#endif
static keycode_st *keys_push(char *p, int code) {
if (getch2_keys.len == getch2_keys.cap) {
getch2_keys.cap *= 2;
if (getch2_keys.cap == 0)
getch2_keys.cap = 32;
getch2_keys.map = realloc(getch2_keys.map, sizeof(keycode_st) * getch2_keys.cap);
}
keycode_st *st = &getch2_keys.map[getch2_keys.len++];
st->cap = NULL;
st->len = strlen(p);
st->code = code;
strncpy(st->chars, p, 8);
return st;
}
static int keys_count_matches(char *buf, int buflen) {
int count = 0;
if (buflen < 0)
buflen = strlen(buf);
for (int i = 0; i < getch2_keys.len; i++) {
keycode_st *st = &getch2_keys.map[i];
int len = MPMIN(buflen, st->len);
if (memcmp(buf, st->chars, len) == 0)
count++;
}
return count;
}
static keycode_st *keys_search(char *buf, int buflen) {
if (buflen < 0)
buflen = strlen(buf);
for (int i = 0; i < getch2_keys.len; i++) {
keycode_st *st = &getch2_keys.map[i];
if (buflen >= st->len && memcmp(buf, st->chars, st->len) == 0)
return st;
}
return NULL;
}
/* pushes only if there is no duplicate.
important as we only consider keys if the matches are unique. */
static keycode_st* keys_push_once(char *p, int code) {
keycode_st *st = keys_search(p, -1);
if (!st)
return keys_push(p, code);
return st;
}
#ifdef HAVE_TERMCAP
typedef struct {
char *buf;
char *pos;
int cap;
} buf_st;
static buf_st termcap_buf;
static void ensure_cap(buf_st *buf, int cap) {
if (buf->pos - buf->buf < cap) {
ptrdiff_t diff = buf->pos - buf->buf;
buf->cap += cap;
buf->buf = realloc(buf->buf, buf->cap);
buf->pos = buf->buf + diff;
}
}
static char *termcap_get(char *id) {
ensure_cap(&termcap_buf, 1024);
return tgetstr(id, &termcap_buf.pos);
}
typedef struct {
char *id;
int code;
} cap_key_pair;
#if 0
#include <stdio.h>
#include <ctype.h>
static void debug_keycode(keycode_st *st) {
if (!st)
return;
char buf[128]; /* worst case should be 70 bytes */
unsigned char *b = &buf[0];
unsigned char *p = &st->chars[0];
if (st->cap)
b += sprintf(b, "%s: ", st->cap);
for(; *p; p++) {
if (*p == 27)
b += sprintf(b, "\\e");
else if (*p < 27)
b += sprintf(b, "^%c", '@' + *p);
else if (!isgraph(*p))
b += sprintf(b, "\\x%02x", (unsigned int)*p);
else
b += sprintf(b, "%c", *p);
}
fprintf(stderr, "%s\n", buf);
}
#endif
static void termcap_add(cap_key_pair pair) {
char *p = termcap_get(pair.id);
if (p) {
keycode_st *st = keys_push_once(p, pair.code);
if (st)
st->cap = pair.id;
/* debug_keycode(st); */
}
}
static void termcap_add_extra_f_keys(void) {
char capbuf[3];
for (int i = 11; i < 0x20; i++) {
unsigned char c;
if (i < 20) { /* 1-9 */
c = '0' + (i - 10);
} else { /* A-Z */
c = 'A' + (i - 20);
}
sprintf(&capbuf[0], "F%c", c);
char *p = termcap_get(capbuf);
if (p)
keys_push_once(p, MP_KEY_F+i);
else
break; /* unlikely that the database has further keys */
}
}
#endif
int load_termcap(char *termtype){
#ifdef HAVE_TERMCAP
#ifdef HAVE_TERMINFO
use_env(TRUE);
int ret;
if (setupterm(termtype, 1, &ret) != OK) {
/* try again, with with "ansi" terminal if it was unset before */
if (!termtype)
termtype = getenv("TERM");
if (!termtype || *termtype == '\0')
termtype = "ansi";
if (setupterm(termtype, 1, &ret) != OK) {
if (ret < 0) {
printf("Could not access the 'terminfo' data base.\n");
return 0;
} else {
printf("Couldn't use terminal `%s' for input.\n", termtype);
return 0;
}
}
}
#else
static char term_buffer[2048];
if (!termtype) termtype = getenv("TERM");
if (!termtype) termtype = "ansi";
int success = tgetent(term_buffer, termtype);
if (success < 0) {
printf("Could not access the 'termcap' data base.\n");
return 0;
} else if (success == 0) {
printf("Terminal type `%s' is not defined.\n", termtype);
return 0;
}
#endif
ensure_cap(&termcap_buf, 2048);
static char term_buf[64];
char *buf_ptr = &term_buf[0];
erase_to_end_of_line = tgetstr("ce", &buf_ptr);
screen_width = tgetnum("co");
screen_height = tgetnum("li");
if (screen_width < 1 || screen_width > 255)
screen_width = 80;
if (screen_height < 1 || screen_height > 255)
screen_height = 24;
term_smkx = tgetstr("ks", &buf_ptr);
term_rmkx = tgetstr("ke", &buf_ptr);
cap_key_pair keys[] = {
{"kP", MP_KEY_PGUP}, {"kN", MP_KEY_PGDWN}, {"kh", MP_KEY_HOME}, {"kH", MP_KEY_END},
{"kI", MP_KEY_INS}, {"kD", MP_KEY_DEL}, /* on PC keyboards */ {"@7", MP_KEY_END},
{"kl", MP_KEY_LEFT}, {"kd", MP_KEY_DOWN}, {"ku", MP_KEY_UP}, {"kr", MP_KEY_RIGHT},
{"do", MP_KEY_ENTER},
{"kb", MP_KEY_BS},
{"k1", MP_KEY_F+1}, {"k2", MP_KEY_F+2}, {"k3", MP_KEY_F+3},
{"k4", MP_KEY_F+4}, {"k5", MP_KEY_F+5}, {"k6", MP_KEY_F+6},
{"k7", MP_KEY_F+7}, {"k8", MP_KEY_F+8}, {"k9", MP_KEY_F+9},
{"k;", MP_KEY_F+10}, {"k0", MP_KEY_F+0},
/* K2 is the keypad center */
{"K2", MP_KEY_KP5},
/* EOL */
{NULL},
};
for (int i = 0; keys[i].id; i++) {
termcap_add(keys[i]);
}
termcap_add_extra_f_keys();
#endif
/* special cases (hardcoded, no need for HAVE_TERMCAP) */
/* it's important to use keys_push_once as we can't have duplicates */
/* many terminals, for emacs compatibility, use 0x7f instead of ^H
when typing backspace, even when the 'kb' cap says otherwise. */
keys_push_once("\177", MP_KEY_BS);
/* mintty always sends these when using the numpad arrows,
even in application mode, for telling them from regular arrows. */
keys_push_once("\033[A", MP_KEY_UP);
keys_push_once("\033[B", MP_KEY_DOWN);
keys_push_once("\033[C", MP_KEY_RIGHT);
keys_push_once("\033[D", MP_KEY_LEFT);
/* mintty uses this instead of the "K2" cap for keypad center */
keys_push_once("\033OE", MP_KEY_KP5);
return getch2_keys.len;
}
void get_screen_size(void) {
struct winsize ws;
if (ioctl(0, TIOCGWINSZ, &ws) < 0 || !ws.ws_row || !ws.ws_col)
return;
screen_width = ws.ws_col;
screen_height = ws.ws_row;
}
#define BUF_LEN 256
static unsigned char getch2_buf[BUF_LEN];
static int getch2_len = 0;
static int getch2_pos = 0;
static void walk_buf(unsigned int count) {
if (!(count < BUF_LEN && count <= getch2_len))
abort();
memmove(&getch2_buf[0], &getch2_buf[count], getch2_len - count);
getch2_len -= count;
getch2_pos -= count;
if (getch2_pos < 0)
getch2_pos = 0;
}
bool getch2(struct input_ctx *input_ctx)
{
int retval = read(0, &getch2_buf[getch2_pos], BUF_LEN - getch2_len - getch2_pos);
/* 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 getch2_enable()
* works.
*/
if (retval < 1)
return retval;
getch2_len += retval;
static enum {
STATE_INITIAL = 0,
STATE_UTF8,
} state = STATE_INITIAL;
static int utf8_len = 0;
while (getch2_pos < getch2_len) {
unsigned char c = getch2_buf[getch2_pos++];
switch (state) {
case STATE_INITIAL: {
int match_count = keys_count_matches(&getch2_buf[0], getch2_len);
if (match_count == 1) {
keycode_st *st = keys_search(&getch2_buf[0], getch2_len);
if (st) {
mp_input_put_key(input_ctx, st->code);
walk_buf(st->len);
} /* else this is still a partial (but unique) match */
continue;
} else if (match_count > 1) {
continue; /* need more bytes to disambiguate */
} else {
/* backtrack, send as UTF-8 */
getch2_pos = 1;
c = getch2_buf[0];
}
utf8_len = bstr_parse_utf8_code_length(c);
if (utf8_len > 1) {
state = STATE_UTF8;
} else if (utf8_len == 1) {
switch (c) {
case 0x1b: /* ESC that's not part of escape sequence */
/* only if ESC was typed twice, otherwise ignore it */
if (getch2_len > 1 && getch2_buf[1] == 0x1b) {
walk_buf(1); /* eat the second ESC */
mp_input_put_key(input_ctx, MP_KEY_ESC);
}
break;
default:
mp_input_put_key(input_ctx, c);
}
walk_buf(1);
} else
walk_buf(getch2_pos);
break;
}
case STATE_UTF8: {
if (getch2_pos < utf8_len) /* need more bytes */
continue;
struct bstr s = {getch2_buf, utf8_len};
int unicode = bstr_decode_utf8(s, NULL);
if (unicode > 0) {
mp_input_put_key(input_ctx, unicode);
}
walk_buf(utf8_len);
state = STATE_INITIAL;
continue;
}
}
}
return true;
}
static volatile int getch2_active = 0;
static volatile int getch2_enabled = 0;
static void do_activate_getch2(void)
{
if (getch2_active)
return;
#ifdef HAVE_TERMCAP
if (term_smkx)
tputs(term_smkx, 1, putchar);
#endif
#ifdef HAVE_TERMIOS
struct termios tio_new;
tcgetattr(0,&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(0,TCSANOW,&tio_new);
#endif
getch2_active = 1;
}
static void do_deactivate_getch2(void)
{
if (!getch2_active)
return;
#ifdef HAVE_TERMCAP
if (term_rmkx)
tputs(term_rmkx, 1, putchar);
#endif
#ifdef HAVE_TERMIOS
if (tio_orig_set) {
// once set, it will never be set again
// so we can cast away volatile here
tcsetattr(0, TCSANOW, (const struct termios *) &tio_orig);
}
#endif
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;
return sigaction(signo, &sa, NULL);
}
void getch2_poll(void){
if (!getch2_enabled)
return;
// check if stdin is in the foreground process group
int newstatus = (tcgetpgrp(0) == 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 void quit_request_sighandler(int signum)
{
do_deactivate_getch2();
async_quit_request = 1;
}
void getch2_enable(void){
if (getch2_enabled)
return;
// handlers to fix terminal settings
setsigaction(SIGCONT, continue_sighandler, 0, true);
setsigaction(SIGTSTP, stop_sighandler, SA_RESETHAND, false);
setsigaction(SIGINT, quit_request_sighandler, SA_RESETHAND, false);
setsigaction(SIGQUIT, quit_request_sighandler, SA_RESETHAND, false);
setsigaction(SIGTTIN, SIG_IGN, 0, true);
do_activate_getch2();
getch2_enabled = 1;
}
void getch2_disable(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(SIGTTIN, SIG_DFL, 0, false);
do_deactivate_getch2();
getch2_enabled = 0;
}
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