tty raw mode

tty raw mode

[Kees van Veen]

Hi,

A while ago I posted a question about getting the console in raw mode.
In the meantime I found a partially working solution using
GetConsoleMode and
SetConsoleMode.

Here's a piece of code:

#include <stdio.h>
#include <fcntl.h>
#include <windows.h>

main()
{
        DWORD dwMode;
        HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
        
        if (GetConsoleMode(hStdIn, &dwMode) == TRUE)
                SetConsoleMode(hStdIn, 
                    dwMode & ~(ENABLE_LINE_INPUT |		/* No buffering */
                               ENABLE_PROCESSED_INPUT |
                               ENABLE_ECHO_INPUT |		/* No echo
*/            			               ENABLE_WINDOW_INPUT));
        for (;;)
        {
                int c = getchar();
                printf("%d <%c>\n", c, c);
        }
}

Now all works fine except for two things:

1) getchar() does not distinguish between <CR> and <LF>
2) <LF) produces <CR><LF>

I've also tried a version using ReadConsole(), I've tried _setmode(0,
O_BINARY), but
without any success.

Does any of you have any idea ?

Thanks in advance for your time.

Kees
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tty raw mode

[Kees van Veen]

Hi,

Just for your information:

I have managed to sort of get where I wanted to be, i.e. run a console
application in raw mode using GetConsoleMode and SetConsoleMode.

I use isatty() to find out whether I'm connected to a tty and then call
GetConsoleMode() to check whether I'm running on a console.

If GetConsoleMode returns FALSE, and isatty() returns TRUE I assume
I'm running from a pseudo tty and then there is no problem, because,
thanks
to the great work of Sergey, Mike Bernson and others, I'm now able to
run my
application using telnet and all my ioctl() settings work.

If I'm running from a console, I use SetConsoleMode to get to a kind of
raw mode (see below).

This does not avoid LF being interpreted as CR/LF though (sigh), so I
switch to
the escape sequence for arrow key down when running from a console.

One thing that struck me is that when I use getc(stdin) to read from the
console
CR (13) is always returned as LF (10) whereas using ReadConsole()
returns 13 upon CR,
even with the SetConsoleMode settings.

Cheers,
Kees

P.S.

For those interested in the Get/SetConsoleMode calls:


        DWORD input_mode, output_mode;
        if (GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE),
&input_mode)==TRUE)
        {
                SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE),
                        input_mode & ~( ENABLE_LINE_INPUT |
                                        ENABLE_ECHO_INPUT |
                                        ENABLE_PROCESSED_INPUT |
                                        ENABLE_WINDOW_INPUT));
        }
        if (GetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE),
&output_mode)==TRUE)
        {
                SetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE),
                        output_mode & ~(ENABLE_WRAP_AT_EOL_OUTPUT));
        }
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