io.c

/*
 * io.c
 * Version 1.00 (C99)  
 * 
 * Copyright 2015 Steven James (www.perfectconsulting.co.uk)
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "io.h"

#ifdef __unix__
#include <termios.h>
#include <unistd.h>
#include <stdio.h>

/*************************************************************************
 * NOTE: Replace these functions for custom I/O e.g. UART                *
 *************************************************************************/

int getch(void) {
    struct termios original, tile;
    int ch;
    
    /* NOTE(MJ): Get original terminal I/O settings */
    tcgetattr(STDIN_FILENO, &original); 
    tile = original; 
    tile.c_lflag &= ~(ICANON | ECHO); 
    tile.c_cc[VTIME] = 0;
    tile.c_cc[VMIN] = 0;
    /* NOTE(MJ); Set new teminal I/O settings */
    tcsetattr(STDIN_FILENO, TCSANOW, &tile); 
    
    ch = getc(stdin);
 
    /* NOTE(MJ): Set original terminal I/O settings */   
    tcsetattr(STDIN_FILENO, TCSANOW, &original);
    
    return ch;
}
#endif

/* TODO(MJ): This hasn't been tested yet... */
int keypressed(void) {
    char ch = getch();

    if (ch != EOF) {
        ungetch(ch);
        return 1;
    }

    return 0;
}