xref: /illumos-gate/usr/src/test/util-tests/tests/awk/gnu/nasty.awk (revision e6d6c189)

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#From: Darrel Hankerson <hankedr@dms.auburn.edu>
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#In-reply-to: <199810131313.QAA31784@alpha.netvision.net.il> (message from
#	Aharon Robbins on Tue, 13 Oct 1998 16:10:36 +0200)
#Subject: Re: full text of bug report?
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#
#   Do you have the full text of the	a = a "\n" f() 	bug report?
#   I can't find it.... I'm not sure there really is a bug.
#
#Yes, see below.
#
#His example has unnecessary fragments (in particular, the use of
#gensub is irrelevant).  As I wrote to you earlier, the interesting
#question for me is:
#
#   Is the concatenation result undefined?  If the result is defined or
#   implementation-dependent, then gawk has a bug.
#
#
#=== Original report =====================================================
#From: Attila Torcsvari <arcdev@mail.matav.hu>
#To: "'bug-gnu-utils@prep.ai.mit.edu'" <bug-gnu-utils@gnu.org>
#Subject: gawk 3.0.3 bug
#Date: Thu, 17 Sep 1998 18:12:13 +0200
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#
#Bug-gnuers,
#please pass it to the responsible.
#
#The following generates something interesting:
#
BEGIN{
a="aaaaa"
a=a a #10
a=a a #20
a=a a #40
a=a a #80
a=a a #160
a=a a # i.e. a is long enough

a=a"\n"f() # this causes the trouble
print a # guess the result
}

function f()
{
#print "a before: ", a
#a=gensub("a","123,","g",a) # 'a' will be just a bit longer (4 times, but still should fit: 4*160=640)
gsub(/a/, "123", a)
#print "a after: ", a
return "X"
}
#
#Possible reason:
#during f the a is modified,
#it can be even freed, because gensub modifies its size
#the printout contains trash.
#
#Used version: VC compiled WinNT 32 bit Intel.
#
#Regards,
#
#Attila Torcsvari
#Arcanum Development
#