Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!seismo!beno!black
From: black@beno.CSS.GOV (Mike Black)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Consoles & RastPorts, and ne'er the twain shall meet
Summary: Source for single key stdin input
Keywords: stdio
Message-ID: <49605@seismo.CSS.GOV>
Date: 6 May 91 11:38:39 GMT
References: <1991Apr29.221442.14665@bilver.uucp> <30094@dime.cs.umass.edu>
Sender: usenet@seismo.CSS.GOV
Distribution: na
Organization: Center for Seismic Studies, Arlington, VA
Lines: 59

Here's what I use for single keystroke handling from stdin:

/* Works with Manx 5.0d */
#include <stdio.h>
#include <sgtty.h>
#include <fcntl.h>

#ifdef DEBUGCON
main()
{
        int c=0;
        setraw();
        while(c==0) {
                puts("Waiting");
                c=getch();
        }
        fflush(stdin);
        printf("\nc=%c\n",c);
        setrawoff();
}
#endif

int chkget() /* returns 1 if char available else returns 0 */
{
        struct _dev *refp;
        refp = _devtab + stdin->_unit;
        if(WaitForChar(refp->fd,1)) return 1;
        return 0;
}

int getch() /* returns char from stdin if available else returns 0 */
{
        char c=0;
        struct _dev *refp;
        refp = _devtab + stdin->_unit;
        if(WaitForChar(refp->fd,1)) c=getchar();
        return c;
}

setraw() /* puts stdin in RAW mode */
{
        struct sgttyb stty;
        ioctl(fileno(stdin),TIOCGETP,&stty);
        stty.sg_flags |= RAW;
        ioctl(fileno(stdin),TIOCSETP,&stty);
}

setrawoff() /* turns RAW mode off on stdin */
{
        struct sgttyb stty;
        ioctl(fileno(stdin),TIOCGETP,&stty);
        stty.sg_flags &= ~RAW;
        ioctl(fileno(stdin),TIOCSETP,&stty);
}
--
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