Arnaud :

A smart change would be to pass a bool to initTermios for whether or not the ECHO flag should removed, and then it will be able to define the new terminal i/o settings itself.
This way you factorize some, and it’s cleaner, it’s more KISS-like.

That would be a bit cleaner indeed. I’ll update the example code a bit.

Edit: code is updated. I have created a new getch_ function as well which is called by both the getch and getche function to minimize duplicated code.

void initTermios(int disable_echo) {
    tcgetattr(0, &old); /* grab old terminal i/o settings */
    new = old; /* make new settings same as old settings */
    new.c_lflag &= ~ICANON; /* disable buffered i/o */
if (disable_echo)
new.c_lflag &= ~ECHO;
    tcsetattr(0, TCSANOW, &new); /* use these new terminal i/o settings now */
}

Change other functions accordingly…