Re: kbhit() MSDOS equivalent in Linux

[Mike Brownlow <mike@ctelcom.net>]

Mario Olimpio de Menezes wrote:
> 
> Hi,
> 
>         I received a message from two students about the kbhit() C MSDOS
> function equivalent in Linux. I'm not a good C programmer and could not
> help them. If somebody can, please.
>         Thanks, and sorry for the little off-topic Debian.

Here ya go,
  A little hefty, but it does the job.

-- start of code snippet
#include <stdio.h>
#include <termios.h>

static struct termios orig, new;
static int peek = -1;

int main()
{
  int ch =0;

  tcgetattr(0, &orig);
  new = orig;
  new.c_lflag &= ~ICANON;
  new.c_lflag &= ~ECHO;
  new.c_lflag &= ~ISIG;
  new.c_cc[VMIN] = 1;
  new.c_cc[VTIME] = 0;
  tcsetattr(0, TCSANOW, &new);

  while(ch != 'q') {
    printf("looping\n");
    sleep(1);
    if(kbhit()) {
        ch = readch();
        printf("you hit %c\n",ch);
    }
  }

  tcsetattr(0,TCSANOW, &orig);
  exit(0);

}


int kbhit()
{

  char ch;
  int nread;

  if(peek != -1) return 1;
  new.c_cc[VMIN]=0;
  tcsetattr(0, TCSANOW, &new);
  nread = read(0,&ch,1);
  new.c_cc[VMIN]=1;
  tcsetattr(0, TCSANOW, &new);

  if(nread == 1) {
   peek = ch;
   return 1;
  }

  return 0;
}

int readch()
{

  char ch;

  if(peek != -1) {
    ch = peek;
    peek = -1;
    return ch;
  }

  read(0,&ch,1);
  return ch;
}
-- end of code snippet

Hope this helps!

- mike


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