A set of minimal dependency bootstrap binaries
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stage0/tty.c

88 lines
2.4 KiB

/* Copyright (C) 2016 Jeremiah Orians
* This file is part of stage0.
*
* stage0 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 3 of the License, or
* (at your option) any later version.
*
* stage0 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 stage0. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
/****************************************************
* To make effective use of this library function: *
* add prototypes for the below functions that you *
* wish to use. Please note that they contain bugs *
****************************************************/
/* In order to restore at exit.*/
static struct termios orig_termios;
/* Raw mode: 1960 magic shit. */
void enableRawMode()
{
struct termios raw;
if(!isatty(STDIN_FILENO))
{
exit(EXIT_FAILURE);
}
if(tcgetattr(STDIN_FILENO, &orig_termios) == -1)
{
exit(EXIT_FAILURE);
}
raw = orig_termios; /* modify the original mode */
/* input modes: no break, no CR to NL, no parity check, no strip char,
* no start/stop output control. */
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
/* output modes - disable post processing */
raw.c_oflag &= ~(OPOST);
/* control modes - set 8 bit chars */
raw.c_cflag |= (CS8);
/* local modes - choing off, canonical off, no extended functions,
* no signal chars (^Z,^C) */
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
/* control chars - set return condition: min number of bytes and timer. */
raw.c_cc[VMIN] = 0; /* Return each byte, or zero for timeout. */
raw.c_cc[VTIME] = 1; /* 100 ms timeout (unit is tens of second). */
/* put terminal in raw mode after flushing */
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) < 0)
{
exit(EXIT_FAILURE);
}
return;
}
void disableRawMode()
{
tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios);
}
char tty_getchar()
{
int nread;
char c;
enableRawMode();
do
{
nread = read(STDIN_FILENO, &c, 1);
} while(nread == 0);
disableRawMode();
return c;
}