kilo.c

/**** header files ****/

#include <unistd.h>  // used for read()
#include <termios.h> // used for tcgetattr() and tcsetattr()
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>  // for printf()
#include <ctype.h>  // for iscntrl()


/**** defines - macros ****/

#define CTRL_KEY(k) ((k) & 0x1f)


/**** data ****/

struct termios orig_termios;



/**** terminal ****/

void die(const char *s)
{
    perror(s);
    exit(1);
}


void disableRawMode()
{
    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1)
    {
        die("tcsetattr");
    }   
}


void enableRawMode()
{
    if (tcgetattr(STDIN_FILENO, &orig_termios) == -1)
    {
        die("tcgetattr");
    }

    atexit(disableRawMode);

    struct termios raw = orig_termios;
    
    raw.c_iflag &= ~(BRKINT | INPCK | ICRNL | ISTRIP | IXON);
    raw.c_oflag &= ~(OPOST);
    raw.c_cflag |= (CS8);
    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
    raw.c_cc[VMIN] = 0;
    raw.c_cc[VTIME] = 1;
    tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);

    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) 
    {   
        die("tcsetattr");
    } 

}



/**** init ****/

int main()
{
    enableRawMode();

    while (1) 
    {
        char c = '\0';
        if (read(STDIN_FILENO, &c, 1) == -1 && errno != EAGAIN)
        {
            die("read");
        }

        if (iscntrl(c))
        {
            printf("%d\r\n", c);
        }
        
        else
        {
            printf("%d ('%c')\r\n", c, c);
        }

        if (c == CTRL_KEY('q'))
        {
            break;
        }
    }
	
    return 0;
}