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Path: utzoo!linus!security!genrad!decvax!decwrl!sun!shannon
From: shannon@sun.uucp (Bill Shannon)
Newsgroups: net.bugs.4bsd
Subject: 4.2bsd awk bug
Message-ID: <378@sun.uucp>
Date: Fri, 9-Dec-83 04:29:39 EST
Article-I.D.: sun.378
Posted: Fri Dec  9 04:29:39 1983
Date-Received: Sun, 11-Dec-83 00:36:57 EST
Organization: Sun Microsystems, Inc.
Lines: 30

Index:	bin/awk 4.2BSD [Fix]

Description:
	Awk doesn't allow you to replace fields.  This bug was
	introduced when the indirect-through-zero bugs in awk
	were fixed.
Repeat-By:
	The following command
		echo 1 2 3 | awk '{$1 = NF; print}'
	should give
		3 2 3
	if it works.
	If it's broken it will give
		1 2 3
Fix:
	Install the following fix:

	--- awk.def
	7a8
	> #define	isnull(x)	((x) == EMPTY || (x) == NULL)

	--- tran.c
	139c139
	< 	if ((vp->tval & FLD) && vp->nval == 0)
	---
	> 	if ((vp->tval & FLD) && isnull(vp->nval))
	154c154
	< 	if ((vp->tval & FLD) && vp->nval == 0)
	---
	> 	if ((vp->tval & FLD) && isnull(vp->nval))