🚀 go-pugleaf

In article <BuLKyI.Jz8@news.cso.uiuc.edu> gordon@osiris.cso.uiuc.edu (John Gordon) writes:
>
>	Hi.  I am trying to make a C program write to stdout in binary mode,
>and can't figure out how to do it.  The problem is that I am writing to a
>device which expects lines to be terminated by a linefeed, *not* an LF/CR
>pair.  I would like to do this to stdout, to be able to pipe it.  I suppose 
>I could write to an intermediate file, if I had to, though.  Can anyone
>figure out a way?  I tried writing to "con", but that can't be redirected.
...

I fought this battle, too, and finally discovered that I had to make an
int21 call to force the driver into binary mode.  Just using normal I/O
calls to set binary mode didn't work.  Here's my code fragment:

	int c,n;
	FILE *prn;	/* usually opened as device "PRN" in "wb" mode,
			   but might be stdout */

	c = setmode(fileno(prn),O_BINARY);	/* One would think that this
						   would suffice */

		/* Ensure that the driver is REALLY in binary mode */
	n = fileno(prn);
	_asm {
		mov	bx,n
		mov	ax,4400h		/* 4400: get device data */
		int	21h
		mov	c,dx
	}
	if(!(c & 0x20)) {    /* If not in binary mode (and it NEVER is) */
		c = c & 0xff | 0x20;		/* set the BINARY mode bit */
		_asm {
			mov	bx,n
			mov	ax,4401h	/* 4401: set device data */
			mov	dx,c
			int	21h
		}
	}


Yes, I know that the code could have been simpler, but I was experimenting,
and once I found the magic combination I never bothered to clean it up.
(Why optimize code that executes once during a program's initialization?)

Bob Nichols
AT&T Bell Laboratories
rnichols@ihlpm.ih.att.com