Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!munnari.oz.au!manuel!ccadfa!bxw
From: bxw@ccadfa.adfa.oz.au (Brad Willcott)
Newsgroups: comp.lang.c
Subject: Re: how do I clear stdin buffer
Message-ID: <2438@ccadfa.adfa.oz.au>
Date: 18 Jun 91 14:20:05 GMT
References: <43310@cup.portal.com>
Organization: Computer Centre, University College, UNSW, ADFA, Canberra, Australia
Lines: 43

tms@cup.portal.com (Taos Mountain Software) writes:

>The stdio function "scanf" works great for input from datafiles, but I always
>run into problems when doing interactive tty I/O on Unix systems.

>For example, this simple program will go into an infinite loop
>if the entry is a non-digit for example ("abc").


#define INT_SIZE 5

>	main ()
>	{
>		int x,stat;
		char buffer[INT_SIZE];

		fflush (stdin);

>		do {
			fgets (buffer, INT_SIZE, stdin);
			stat = sscanf ("%d", &x);
>			/* stat=scanf("%d",&x); */
>		} while (stat != 1);
>		...
>		...
>	}

	fflush (FILE *stream)
	{
		int i;

		while ((i = getc (stream)) != EOF) ;
	}


>I know there are plenty of workarounds, but what I'm interested in is a
>function like fflush that deals with input streams.

-- 
Brad Willcott,                          ACSnet:     bxw@ccadfa.cc.adfa.oz
Computing Services,                     Internet:   bxw@ccadfa.cc.adfa.oz.au
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