#From gregfjohnson@yahoo.com Sun Aug 30 08:36:36 2009 #Return-Path: #Received: from aahz (localhost [127.0.0.1]) # by skeeve.com (8.14.1/8.14.1) with ESMTP id n7U5WoJ2003836 # for ; Sun, 30 Aug 2009 08:36:36 +0300 #X-Spam-Checker-Version: SpamAssassin 3.2.4 (2008-01-01) on server1.f7.net #X-Spam-Level: #X-Spam-Status: No, score=-6.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED # autolearn=ham version=3.2.4 #X-Envelope-From: gregfjohnson@yahoo.com #X-Envelope-To: #Received: from server1.f7.net [64.34.169.74] # by aahz with IMAP (fetchmail-6.3.7) # for (single-drop); Sun, 30 Aug 2009 08:36:36 +0300 (IDT) #Received: from fencepost.gnu.org (fencepost.gnu.org [140.186.70.10]) # by f7.net (8.11.7-20030920/8.11.7) with ESMTP id n7U33m709453 # for ; Sat, 29 Aug 2009 22:03:48 -0500 #Received: from mail.gnu.org ([199.232.76.166]:42095 helo=mx10.gnu.org) # by fencepost.gnu.org with esmtp (Exim 4.67) # (envelope-from ) # id 1Mhai6-0004Qt-3R # for bug-gawk@gnu.org; Sat, 29 Aug 2009 23:04:06 -0400 #Received: from Debian-exim by monty-python.gnu.org with spam-scanned (Exim 4.60) # (envelope-from ) # id 1Mhai5-00062I-EM # for bug-gawk@gnu.org; Sat, 29 Aug 2009 23:04:05 -0400 #Received: from web33507.mail.mud.yahoo.com ([68.142.206.156]:28597) # by monty-python.gnu.org with smtp (Exim 4.60) # (envelope-from ) # id 1Mhai5-00061w-2n # for bug-gawk@gnu.org; Sat, 29 Aug 2009 23:04:05 -0400 #Received: (qmail 68722 invoked by uid 60001); 30 Aug 2009 03:04:03 -0000 #DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1251601443; bh=9h2ZOOgxUh+s8Ow5/ZMWUxcviy2L4rpiaNamPAXxhEk=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=tWxCQq/aTOT5lhtdPc5hxtXzOjDFmLU6Ao0BSlwbeeBsd9Wl6DU3JCR4gTkoL0aVUOTdjMjgRY7I72yCht+YruDiqZrvtSKvUoAvZAKcPG26RE4jzxUlxQklEHZG9mq9h2gpTIiLYehYDiC0975wukwi/e7ePADfkFwg8eTnT44= #DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; # s=s1024; d=yahoo.com; # h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; # b=LWfhVgxojFG1eYoRrxtrS3YOfH3MTUVTYZle/4utMQEPZQfsmrn6GBwBfThryGqJyZfg38/7JfK9cz/Q3Yt+mf8+xl9/m+Srckc+Xvi42CE0OmoN439vCyhAD8A74XOJsmfKDjJ/+LtioShStUohj1iYDDmRTN4RnnP9X4xnt3c=; #Message-ID: <410222.68490.qm@web33507.mail.mud.yahoo.com> #X-YMail-OSG: mfjax.MVM1lI2q5gcl6bChbn6zHgNgj1fByHWJSzB8ZZUmI2QCH6pNwV_IaHxcqecu.VqjKUR6HQhXbziUnX.v5E2nOE61ass9AzqfdVOtKTEAzTPQJ8Z7QB7fq7BMtjn8yohDR6mwOyVTqv3RZh0m1Us7sLit6UmcgeSvJo2rROAmeceq.FBwk2XnEp2_QsljjPHak_WXyvtAK81klDv5qQORWQWqR9q79x7yxORL6fLWwb_x6mZZMSOUaA0p8.ucT453eqT1L8NGkthF.fXmOM3_EYd03zUgr9Sb.zvMvbDC3MCMnVr0JT1uroLmFtVIdTojrFJYFQEDFSB9zT3Ua80ZpGXrjQGx3rZw-- #Received: from [71.165.246.171] by web33507.mail.mud.yahoo.com via HTTP; Sat, 29 Aug 2009 20:04:03 PDT #X-Mailer: YahooMailClassic/6.1.2 YahooMailWebService/0.7.338.2 #Date: Sat, 29 Aug 2009 20:04:03 -0700 (PDT) #From: Greg Johnson #Subject: bugs in passing uninitialized array to a function #To: bug-gawk@gnu.org #MIME-Version: 1.0 #Content-Type: multipart/mixed; boundary="0-1690489838-1251601443=:68490" #X-detected-operating-system: by monty-python.gnu.org: FreeBSD 6.x (1) #Status: RO # #--0-1690489838-1251601443=:68490 #Content-Type: text/plain; charset=us-ascii # #I am using gawk version 3.1.7. # #The attached programs illustrate what look to me like two bugs #in the handling of uninitialized variables to functions that treat #them as arrays. # #Greg Johnson # # # #--0-1690489838-1251601443=:68490 #Content-Type: application/octet-stream; name=b1 #Content-Transfer-Encoding: base64 #Content-Disposition: attachment; filename="b1" # bug? on uninitialized array, length(a) prints as 3, then the loop # behaves differently, iterating once. so, length() behaves differently # on two calls to the same variable, which was not changed. function prt1(a, len) { print "length: " length(a) for (i = 1; i <= length(a); i++) printf "<" i "," a[i] "> " print "\n" } BEGIN { prt1(zzz) } #--0-1690489838-1251601443=:68490 #Content-Type: application/octet-stream; name=b2 #Content-Transfer-Encoding: base64 #Content-Disposition: attachment; filename="b2" # shouldn't an uninitialized array have length zero? # length is printed as 1, and the loop iterates once. function prt(a, len) { len = length(a) print "length: " len for (i = 1; i <= len; i++) printf "<" i "," a[i] "> " print "\n" } BEGIN { prt(zzz) } #--0-1690489838-1251601443=:68490--