89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/* Copyright (C) 2016 Jeremiah Orians
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* This file is part of stage0.
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*
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* stage0 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* stage0 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with stage0. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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/****************************************************
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* To make effective use of this library function: *
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* add prototypes for the below functions that you *
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* wish to use. Please note that they contain bugs *
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****************************************************/
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/* In order to restore at exit.*/
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static struct termios orig_termios;
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/* Raw mode: 1960 magic shit. */
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void enableRawMode()
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{
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struct termios raw;
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if(!isatty(STDIN_FILENO))
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{
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exit(EXIT_FAILURE);
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}
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if(tcgetattr(STDIN_FILENO, &orig_termios) == -1)
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{
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exit(EXIT_FAILURE);
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}
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raw = orig_termios; /* modify the original mode */
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/* input modes: no break, no CR to NL, no parity check, no strip char,
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* no start/stop output control. */
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raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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/* output modes - disable post processing */
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raw.c_oflag &= ~(OPOST);
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/* control modes - set 8 bit chars */
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raw.c_cflag |= (CS8);
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/* local modes - choing off, canonical off, no extended functions,
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* no signal chars (^Z,^C) */
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raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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/* control chars - set return condition: min number of bytes and timer. */
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raw.c_cc[VMIN] = 0; /* Return each byte, or zero for timeout. */
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raw.c_cc[VTIME] = 1; /* 100 ms timeout (unit is tens of second). */
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/* put terminal in raw mode after flushing */
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if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) < 0)
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{
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exit(EXIT_FAILURE);
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}
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return;
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}
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void disableRawMode()
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{
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tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios);
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}
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char tty_getchar()
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{
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int nread;
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char c;
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enableRawMode();
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do
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{
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nread = read(STDIN_FILENO, &c, 1);
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} while(nread == 0);
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disableRawMode();
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return c;
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}
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