Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!mailrus!tut.cis.ohio-state.edu!rutgers!rochester!pt.cs.cmu.edu!cadre!pitt!darth!apexepa!jcj
From: jcj@apexepa.UUCP (John Juback)
Newsgroups: comp.sys.mac.programmer
Subject: Buffering in MPW stdio
Message-ID: <340@apexepa.UUCP>
Date: 29 Aug 88 20:47:07 GMT
Organization: Apex Software Corp., Pittsburgh, Pa.
Lines: 38

I'm porting some UNIX utilities to the Mac as MPW tools.  Predictably,
there are sections of code that look something like this:

	char buf[256];
	printf("Prompt: ");
	gets(buf);

Unfortunately, "buf" contains the prompt string as well as the user's
response (unlike any UNIX or DOS implementation of stdio that I've seen).
I figured that the following lines would properly change the buffering mode:

	setvbuf(stdin, NULL, _IONBF | _IOSYNC, 0);
	setvbuf(stdout, NULL, _IONBF | _IOSYNC, 0);

That didn't work, so I tried an explicit "fflush" right before the "gets."
That didn't work either.  I suppose that a routine like the following would
do the trick,

	char *prompt(q, a)
	char *q, *a;
		{
		printf(q);
		gets(a);
	#ifdef ghs
		return a + strlen(q);
	#else
		return a;
		}

but it's annoying that MPW hasn't faithfully ported stdio, nonetheless.
Has anyone figured out a way to make stdio behave properly?
-- 
						             ____
"Omit needless words."				    /\   | )      \ /
						   /  \  |   ---   /
	- Strunk and White			  /    \ |   ____ / \

John C. Juback					  Apex Software Corporation
{allegra,bellcore,cadre}!pitt!darth!apexepa!jcj   Phone: (412) 681-4343