From owner-freebsd-hackers  Thu Aug 20 20:09:12 1998
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To: Brian Somers <brian@Awfulhak.org>
Subject: Re: Realloc fix for review 
Cc: Archie Cobbs <archie@whistle.com>, nate@mt.sri.com (Nate Williams),
        hackers@FreeBSD.ORG
In-reply-to: Your message of "Fri, 21 Aug 1998 02:07:35 BST."
		<199808210107.CAA13727@awfulhak.org> 
References: <199808210107.CAA13727@awfulhak.org>  
Date: Thu, 20 Aug 1998 21:08:59 -0600
From: Warner Losh <imp@village.org>
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In message <199808210107.CAA13727@awfulhak.org> Brian Somers writes:
: AFAIK not all free() implementations ignore a NULL pointer (although 
: FreeBSD's does).  But then, not all realloc() implementations allow a 
: NULL either (FreeBSD's does) :-/

free(NULL); is required to be valid by tha ANSI standard.  I don't
know about the realloc(NULL, s); case, however.

But, the frealloc, as I implemented it (rather than how I posted it)
looks exactly like:

#include <stdlib.h>

void *
frealloc(void *ptr, size_t size)
{
    void *nptr;

    nptr = realloc(ptr, size);
    if (!nptr && ptr)
        free(ptr);
    return (nptr);
}

which does try to avoid calling free(NULL).

Warner

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