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terminal.c
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terminal.c
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#include <stdlib.h>
#include <termios.h>
#include <errno.h>
#include <stdio.h>
#include "terminal.h"
#define EXPAND 2
int tty_default_mode(terminal_state *state) {
struct termios buf;
if (tty_reset(state) < 0) {
return -1;
}
if (tcgetattr(state->fd, &buf) < 0) {
return -1;
}
buf.c_lflag &= ~ISIG;
if (tcsetattr(state->fd, TCSAFLUSH, &buf) < 0) {
return -1;
}
return 0;
}
int tty_raw_mode(terminal_state *state) {
int err;
struct termios buf;
if (tty_reset(state) < 0) {
return -1;
}
if (tcgetattr(state->fd, &buf) < 0) {
return -1;
}
buf.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
buf.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
buf.c_cflag &= ~(CSIZE | PARENB);
buf.c_cflag |= CS8;
buf.c_oflag &= ~(OPOST);
buf.c_cc[VMIN] = 1;
buf.c_cc[VTIME] = 0;
if (tcsetattr(state->fd, TCSAFLUSH, &buf) < 0) {
return -1;
}
if (tcgetattr(state->fd, &buf) < 0) {
err = errno;
tcsetattr(state->fd, TCSAFLUSH, &state->original_termios);
errno = err;
return -1;
}
if ((buf.c_lflag & (ECHO | ICANON | IEXTEN | ISIG)) ||
(buf.c_iflag & (BRKINT | ICRNL | INPCK | ISTRIP | IXON)) ||
(buf.c_cflag & (CSIZE | PARENB | CS8)) != CS8 ||
(buf.c_oflag & OPOST) || buf.c_cc[VMIN] != 1 ||
buf.c_cc[VTIME] != 0) {
tcsetattr(state->fd, TCSAFLUSH, &(state->original_termios));
errno = EINVAL;
return -1;
}
return 0;
}
int tty_reset(terminal_state *state) {
if (tcgetattr(state->fd, &state->last_termios) < 0) {
return -1;
}
if (tcsetattr(state->fd, TCSAFLUSH, &(state->original_termios)) < 0) {
return -1;
}
return 0;
}
int tty_reset_last_state(terminal_state *state) {
struct termios last_termios = state->last_termios;
if (tty_reset(state) < 0) {
return -1;
}
if (tcsetattr(state->fd, TCSAFLUSH, &last_termios) < 0) {
return -1;
}
return 0;
}
int register_tty(int fd, terminal_state *state) {
if (tcgetattr(fd, &(state->original_termios)) < 0) {
return -1;
}
state->fd = fd;
state->last_termios = state->original_termios;
return 0;
}