Programming

#include <termios.h>
#include <stdio.h>

int
getch(void) {
    struct termios old;
    struct termios new;
    int rc;
    if (tcgetattr(0, &old) == -1) {
        return -1;
    }
    new = old;
    new.c_lflag &= ~(ICANON | ECHO);
    new.c_cc[VMIN] = 1;
    new.c_cc[VTIME] = 0;
    if (tcsetattr(0, TCSANOW, &new) == -1) {
        return -1;
    }
    rc = getchar();
    (void) tcsetattr(0, TCSANOW, &old);
    return rc;
}