From owner-freebsd-bugs  Thu May 30 10:35:28 2002
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Date: Fri, 31 May 2002 03:38:42 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: mm <meadele@nerim.net>
Cc: freebsd-bugs@FreeBSD.ORG
Subject: Re: snprintf() bug ?
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On Thu, 30 May 2002, mm wrote:

>   int ln;
>   char *a_stuff = "hello";
>   char *b_stuff = "world";
>
>   while( 1 )
>       ln = snprintf(NULL, 0, "%s=%s", a_stuff, b_stuff);
>
> This result in memory leak, BUT if I use:
>
>   char buf[1];
>   int ln;
>   char *a_stuff = "hello";
>   char *b_stuff = "world";
>
>   while( 1 )
>       ln = snprintf(buf, 0, "%s=%s", a_stuff, b_stuff);
>
> No memory leak.
>
> Is this a snprintf() bug, or am i doing something wrong ?
> I'm using FreeBSD-4.4.

It is an snprintf() bug.  See PR 26044.  It is still not fixed.  An
attempted fix was committed and backed out almost a year ago.

Bruce


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