Date: Thu, 23 May 2002 15:47:09 -0700 From: Clint Olsen <clint@0lsen.net> To: echo dev <echo_dev@hotmail.com> Cc: hackers@freebsd.org Subject: Re: your mail Message-ID: <20020523224709.GA77003@0lsen.net> In-Reply-To: <F107VCxPcnietfhTGBe00009c91@hotmail.com> References: <F107VCxPcnietfhTGBe00009c91@hotmail.com>
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On May 23, echo dev wrote: > is there anyone that might know why the fflush did not work???? I fugre > this works besuse it shoves an empty vale into the buffer thus casuseing > it to be empty..... From the C-FAQ - http://www.eskimo.com/~scs/C-faq/top.html 12.26: How can I flush pending input so that a user's typeahead isn't read at the next prompt? Will fflush(stdin) work? A: fflush() is defined only for output streams. Since its definition of "flush" is to complete the writing of buffered characters (not to discard them), discarding unread input would not be an analogous meaning for fflush on input streams. There is no standard way to discard unread characters from a stdio input stream, nor would such a way necessarily be sufficient, since unread characters can also accumulate in other, OS-level input buffers. You may be able to read and discard characters until \n, or use the curses flushinp() function, or use some system-specific technique. See also questions 19.1 and 19.2. References: ISO Sec. 7.9.5.2; H&S Sec. 15.2. -Clint To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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