Re: [rtl] kbhit

[s_a_white]

> Hi all,
>   I want to get the character while I strike any key,I try to use
getchar(),but it need to strike ENTER to end of string,can I get the value
of key immediately before I strike ENTER.In DOS,I can use kbhit() to check
if there is any key to be striked,but how can I do in linux?
>   I have no idea how to get the key. Do you have any idea?
>
> Thanks!
>
> Michael
>

Hi,

I've seen you have had many replies, heres mine which I'm using in a program
which is cross platform.  Just call enable and it'll work.  Make sure you
call disable when you program exists (even for things like ^C)!

// Simulate Standard Microsoft Extensions under Unix
int _kbhit (void)
{   // Set no delay
    static struct timeval tv = {0, 0};
    fd_set rdfs;

    // See if key has been pressed
    FD_ZERO (&rdfs);
    FD_SET  (STDERR_FILENO, &rdfs);
    if (select  (STDERR_FILENO + 1, &rdfs, NULL, NULL, &tv) <= 0)
        return 0;
    if (FD_ISSET (STDERR_FILENO, &rdfs))
        return 1;
    return 0;
}

int _getch (void)
{
    char ch = 0;
    if (read (STDERR_FILENO, &ch, 1) < 0);
        return -1;
    return ch;
}

// Set keyboard to raw mode so getch will work
static termios term;
void keyboard_enable_raw ()
{
    // set to non canonical mode, echo off, ignore signals
    struct termios current;
    // save current terminal settings
    tcgetattr (STDERR_FILENO, &current);

    // set to non canonical mode, echo off, ignore signals
    term = current;
    current.c_lflag &= ~(ECHO | ICANON | IEXTEN);
    current.c_cc[VMIN] = 1;
    current.c_cc[VTIME] = 0;
    tcsetattr (STDERR_FILENO, TCSAFLUSH, &current);
}

void keyboard_disable_raw ()
{
    // Restore old terminal settings
    tcsetattr (STDERR_FILENO, TCSAFLUSH, &term);
}

Simon


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