1#From gregfjohnson@yahoo.com Sun Aug 30 08:36:36 2009 2#Return-Path: <gregfjohnson@yahoo.com> 3#Received: from aahz (localhost [127.0.0.1]) 4# by skeeve.com (8.14.1/8.14.1) with ESMTP id n7U5WoJ2003836 5# for <arnold@localhost>; Sun, 30 Aug 2009 08:36:36 +0300 6#X-Spam-Checker-Version: SpamAssassin 3.2.4 (2008-01-01) on server1.f7.net 7#X-Spam-Level: 8#X-Spam-Status: No, score=-6.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED 9# autolearn=ham version=3.2.4 10#X-Envelope-From: gregfjohnson@yahoo.com 11#X-Envelope-To: <arnold@skeeve.com> 12#Received: from server1.f7.net [64.34.169.74] 13# by aahz with IMAP (fetchmail-6.3.7) 14# for <arnold@localhost> (single-drop); Sun, 30 Aug 2009 08:36:36 +0300 (IDT) 15#Received: from fencepost.gnu.org (fencepost.gnu.org [140.186.70.10]) 16# by f7.net (8.11.7-20030920/8.11.7) with ESMTP id n7U33m709453 17# for <arnold@skeeve.com>; Sat, 29 Aug 2009 22:03:48 -0500 18#Received: from mail.gnu.org ([199.232.76.166]:42095 helo=mx10.gnu.org) 19# by fencepost.gnu.org with esmtp (Exim 4.67) 20# (envelope-from <gregfjohnson@yahoo.com>) 21# id 1Mhai6-0004Qt-3R 22# for bug-gawk@gnu.org; Sat, 29 Aug 2009 23:04:06 -0400 23#Received: from Debian-exim by monty-python.gnu.org with spam-scanned (Exim 4.60) 24# (envelope-from <gregfjohnson@yahoo.com>) 25# id 1Mhai5-00062I-EM 26# for bug-gawk@gnu.org; Sat, 29 Aug 2009 23:04:05 -0400 27#Received: from web33507.mail.mud.yahoo.com ([68.142.206.156]:28597) 28# by monty-python.gnu.org with smtp (Exim 4.60) 29# (envelope-from <gregfjohnson@yahoo.com>) 30# id 1Mhai5-00061w-2n 31# for bug-gawk@gnu.org; Sat, 29 Aug 2009 23:04:05 -0400 32#Received: (qmail 68722 invoked by uid 60001); 30 Aug 2009 03:04:03 -0000 33#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= 34#DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; 35# s=s1024; d=yahoo.com; 36# h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; 37# b=LWfhVgxojFG1eYoRrxtrS3YOfH3MTUVTYZle/4utMQEPZQfsmrn6GBwBfThryGqJyZfg38/7JfK9cz/Q3Yt+mf8+xl9/m+Srckc+Xvi42CE0OmoN439vCyhAD8A74XOJsmfKDjJ/+LtioShStUohj1iYDDmRTN4RnnP9X4xnt3c=; 38#Message-ID: <410222.68490.qm@web33507.mail.mud.yahoo.com> 39#X-YMail-OSG: mfjax.MVM1lI2q5gcl6bChbn6zHgNgj1fByHWJSzB8ZZUmI2QCH6pNwV_IaHxcqecu.VqjKUR6HQhXbziUnX.v5E2nOE61ass9AzqfdVOtKTEAzTPQJ8Z7QB7fq7BMtjn8yohDR6mwOyVTqv3RZh0m1Us7sLit6UmcgeSvJo2rROAmeceq.FBwk2XnEp2_QsljjPHak_WXyvtAK81klDv5qQORWQWqR9q79x7yxORL6fLWwb_x6mZZMSOUaA0p8.ucT453eqT1L8NGkthF.fXmOM3_EYd03zUgr9Sb.zvMvbDC3MCMnVr0JT1uroLmFtVIdTojrFJYFQEDFSB9zT3Ua80ZpGXrjQGx3rZw-- 40#Received: from [71.165.246.171] by web33507.mail.mud.yahoo.com via HTTP; Sat, 29 Aug 2009 20:04:03 PDT 41#X-Mailer: YahooMailClassic/6.1.2 YahooMailWebService/0.7.338.2 42#Date: Sat, 29 Aug 2009 20:04:03 -0700 (PDT) 43#From: Greg Johnson <gregfjohnson@yahoo.com> 44#Subject: bugs in passing uninitialized array to a function 45#To: bug-gawk@gnu.org 46#MIME-Version: 1.0 47#Content-Type: multipart/mixed; boundary="0-1690489838-1251601443=:68490" 48#X-detected-operating-system: by monty-python.gnu.org: FreeBSD 6.x (1) 49#Status: RO 50# 51#--0-1690489838-1251601443=:68490 52#Content-Type: text/plain; charset=us-ascii 53# 54#I am using gawk version 3.1.7. 55# 56#The attached programs illustrate what look to me like two bugs 57#in the handling of uninitialized variables to functions that treat 58#them as arrays. 59# 60#Greg Johnson 61# 62# 63# 64#--0-1690489838-1251601443=:68490 65#Content-Type: application/octet-stream; name=b1 66#Content-Transfer-Encoding: base64 67#Content-Disposition: attachment; filename="b1" 68 69# bug? on uninitialized array, length(a) prints as 3, then the loop 70# behaves differently, iterating once. so, length() behaves differently 71# on two calls to the same variable, which was not changed. 72 73function prt1(a, len) 74{ 75 print "length: " length(a) 76 77 for (i = 1; i <= length(a); i++) 78 printf "<" i "," a[i] "> " 79 80 print "\n" 81} 82 83BEGIN { 84 prt1(zzz) 85} 86 87#--0-1690489838-1251601443=:68490 88#Content-Type: application/octet-stream; name=b2 89#Content-Transfer-Encoding: base64 90#Content-Disposition: attachment; filename="b2" 91 92# shouldn't an uninitialized array have length zero? 93# length is printed as 1, and the loop iterates once. 94 95function prt(a, len) 96{ 97 len = length(a) 98 print "length: " len 99 100 for (i = 1; i <= len; i++) 101 printf "<" i "," a[i] "> " 102 103 print "\n" 104} 105 106BEGIN { 107 prt(zzz) 108} 109 110#--0-1690489838-1251601443=:68490-- 111 112