Path: utzoo!attcan!uunet!husc6!mailrus!ames!oliveb!pyramid!prls!mips!hitz
From: hitz@mips.COM (David Hitz)
Newsgroups: comp.unix.questions
Subject: Re: Guessing buffer size needed for sprintf beforehand
Summary: RBFM -- Read Both Fucking Manuals.
Message-ID: <2190@quacky.mips.COM>
Date: 16 May 88 05:53:55 GMT
References: <136@insyte.uucp> <7768@ncoast.UUCP>
Reply-To: hitz@mips.COM (David Hitz)
Organization: MIPS Computer Systems, Sunnyvale, CA
Lines: 20

In article <7768@ncoast.UUCP> allbery@ncoast.UUCP (Brandon Allbery) writes:
>As quoted from <136@insyte.uucp> by jad@insyte.uucp (Jill Diewald):
>+---------------
>| One solution is to fprintf into a file opened to be /dev/null.
[...]
>Close.  fprintf() to a newly-created temporary file, then rewind() it (this
>is a stdio function) and getc() out of it and send it wherever.  If you need
>the size, get the file size using the OS's current-file-position call before
>the rewind().  This is perhaps a bit slower than an in-core buffer, but it's
>clean and is limited only by free space on the disk!

Oops: SYSV vs. BSD.

In SYSV printf() returns the number of characters printed, so Jill's
solution works fine without Brandon's gyrations.

In BSD printf() returns the first argument.
-- 
Dave Hitz					home: 408-739-7116
UUCP: {decvax,ucbvax,ihnp4}!decwrl!mips!hitz 	play: 408-991-0345