Some questions for mini game Post: 302475095

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Top Forums Programming Some questions for mini game Post 302475095 by Corona688 on Friday 26th of November 2010 11:17:19 AM

11-26-2010

Registered User

Threading is a whole new kettle of fish and wouldn't completely fix the problem anyway -- you'd still need to mess with the terminal settings. You can do reads without blocking anyway, though it means changing your terminal settings and using the unix read() or select() call instead of stdio calls or iostream objects. Letting you do what you want in a loop.

Code:

#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>

int main(void)
{
    int fd=STDIN_FILENO;	/* STDIN=0, STDOUT=1, STDERR=2 */
    int running=1;

    system("stty -icanon min 0 -echo"); // So we can read one char at a time.
    // -echo means it doesn't autorepeat what you type, either.

    while(running)
    {
        char buf[512];
        ssize_t bytes;

        bytes=read(fd, &buf, 511);
        if(bytes > 0)
        {
          running=0;
          buf[bytes]='\0'; // NULL-terminate it
          fprintf(stderr, "Read %d bytes: %s\n", (int)bytes, buf);
          running=0;
        }
        else
        {
          fprintf(stderr, "not ready\n");
          usleep(100000L);
        }
    }

    system("stty sane"); // Return terminal to normal

    return(0);
}

Using system("stty") is a bit of a hack but works fine. It alters terminal settings for stdin, which are global to a terminal, i.e. if you don't reset your terminal after your program quits you'll still have weird settings! If you want to take a look at how stty actually works, you can see my examples tcgets.c and tcgets.h. That's code for using a serial port but as far as UNIX is concerned, all terminals are serial ports...

Last edited by Corona688; 11-26-2010 at 12:38 PM..

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stty

stty(2) 							System Calls Manual							   stty(2)

NAME

       stty(), gtty() - control terminal device (Bell Version 6 compatibility)

SYNOPSIS

   Remarks
       These system calls are preserved for backward compatibility with Bell Version 6.  They provide as close an approximation as possible to the
       old Version 6 functions.  All new code should use the and calls described in termio(7).

DESCRIPTION

       For certain status settings and status inquiries about terminal devices, the functions and are equivalent to

       and

       respectively (see ioctl(2) and termio(7).

RETURN VALUE

       and return the following values:

	      Successful completion.
	      Failure.
		     is set to indicate the error.

ERRORS

       If or fails, is set to one of the following values:

       [EBADF]	      is not a valid file descriptor.

       [EFAULT]       points to an invalid address.

WARNINGS

   Obsolescent Interfaces
       and are to be obsoleted at a future date.

SEE ALSO

       stty(1), exec(2), ioctl(2), sttyV6(7), termio(7), tty(7).

								  TO BE OBSOLETED							   stty(2)