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Path: utzoo!mnetor!seismo!rutgers!ames!ucbcad!ucbvax!hplabs!hpcea!hpsrla!hpsrlc!darrylo
From: darrylo@hpsrlc.HP.COM (Darryl Okahata)
Newsgroups: comp.sys.ibm.pc
Subject: Re: How do you flush the PC's keyboard?
Message-ID: <3320019@hpsrlc.HP.COM>
Date: Tue, 2-Jun-87 10:52:55 EDT
Article-I.D.: hpsrlc.3320019
Posted: Tue Jun  2 10:52:55 1987
Date-Received: Sat, 6-Jun-87 12:57:06 EDT
References: <747@thumper.UUCP>
Organization: Network Measurements Div - Santa Rosa, CA
Lines: 44

In comp.sys.ibm.pc, tr@thumper.UUCP writes:
>
>According to _Advanced MS-DOS_ by Ray Duncan, DOS function C (hex)
>resets the input buffer and then gets a character for input using one
>of five DOS functions.  They are 1, 6, 7, 8, and A (hex).  I want to
>flush the keyboard without getting input.  The reason for this is that
>the next thing my program does is call up a canned function that uses
>keyboard input.
>
>I am using Lattice C.  Is there a standard way of doing this with C or
>Assembler?  I would not expect
>
>	fflush(stdin);
>
>to work because fflush is said to be for output buffers.
>
>Thank you for your attention.  You people are great.
>
>-- 
>Tom Reingold
>INTERNET:       tr@bellcore.bellcore.com
>UUCP: 		{seismo,ihnp4,ucbvax,decvax}!bellcore!tr
>		{ulysses,allegra,clyde,princeton}!bellcore!tr
>----------

     With assembler, you use two DOS functions (I don't remember the
function numbers): one which checks to see if a keyboard character is
available, and another to read a keyboard character.  From here, it's
simple (given in C pseudocode):

	while (character_available())
		read_character();	/* throw read characters into the
					   bit bucket */

I don't know of any *standard* way to do this.

     -- Darryl Okahata
        ucbvax!ucbcad!ames!hplabs!hpcea!hpsrla!darrylo		<== best path
	hplabs!hpcea!hpsrla!darrylo				<== alternative
	CompuServe: 75206,3074

Disclaimer: the above is the author's personal opinion and is not the
opinion or policy of his employer or of the little green men that
have been following him all day.