139 lines
5.9 KiB
Awk
139 lines
5.9 KiB
Awk
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# Sat, 27 Jan 2001 07:15:44 -0600
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# Date: Sat, 27 Jan 2001 07:15:44 -0600
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# Message-Id: <200101271315.HAA24441@yak.dms.auburn.edu>
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# From: Darrel Hankerson <hankedr@dms.auburn.edu>
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# To: arnold@skeeve.com
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# Subject: [stolfi@ic.unicamp.br: Bug in [...]* matching with acute-u]
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# Content-Type: message/rfc822
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# Status: R
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#
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# From: Jorge Stolfi <stolfi@ic.unicamp.br>
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# To: bug-gnu-utils@gnu.org
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# Subject: Bug in [...]* matching with acute-u
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# Date: Sat, 27 Jan 2001 06:46:11 -0200 (EDT)
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# Content-Length: 3137
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#
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#
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#
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# Hi,
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#
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# I think I have run into a bug in gawk's handling of REs of the
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# form [...]* when the bracketed list includes certain 8-bit characters,
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# specifically u-acute (octal \372).
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#
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# The problem occurs in GNU Awk 3.0.4, both under
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# Linux 2.2.14-5.0 (intel i686) and SunOS 5.5 (Sun sparc).
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#
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# Here is a program that illustrates the bug, and its output.
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# The first two lines of the output should be equal, shouldn't they?
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#
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# ----------------------------------------------------------------------
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#! /usr/bin/gawk -f
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BEGIN {
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s = "bananas and ananases in canaan";
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t = s; gsub(/[an]*n/, "AN", t); printf "%-8s %s\n", "[an]*n", t;
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t = s; gsub(/[an<61>]*n/, "AN", t); printf "%-8s %s\n", "[an<61>]*n", t;
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print "";
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t = s; gsub(/[a<>]*n/, "AN", t); printf "%-8s %s\n", "[a<>]*n", t;
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print "";
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t = s; gsub(/[an]n/, "AN", t); printf "%-8s %s\n", "[an]n", t;
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t = s; gsub(/[a<>]n/, "AN", t); printf "%-8s %s\n", "[a<>]n", t;
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t = s; gsub(/[an<61>]n/, "AN", t); printf "%-8s %s\n", "[an<61>]n", t;
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print "";
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t = s; gsub(/[an]?n/, "AN", t); printf "%-8s %s\n", "[an]?n", t;
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t = s; gsub(/[a<>]?n/, "AN", t); printf "%-8s %s\n", "[a<>]?n", t;
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t = s; gsub(/[an<61>]?n/, "AN", t); printf "%-8s %s\n", "[an<61>]?n", t;
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print "";
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t = s; gsub(/[an]+n/, "AN", t); printf "%-8s %s\n", "[an]+n", t;
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t = s; gsub(/[a<>]+n/, "AN", t); printf "%-8s %s\n", "[a<>]+n", t;
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t = s; gsub(/[an<61>]+n/, "AN", t); printf "%-8s %s\n", "[an<61>]+n", t;
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}
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# ----------------------------------------------------------------------
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# [an]*n bANas ANd ANases iAN cAN
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# [an<61>]*n bananas and ananases in canaan
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#
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# [a<>]*n bANANas ANd ANANases iAN cANAN
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#
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# [an]n bANANas ANd ANANases in cANaAN
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# [a<>]n bANANas ANd ANANases in cANaAN
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# [an<61>]n bANANas ANd ANANases in cANaAN
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#
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# [an]?n bANANas ANd ANANases iAN cANaAN
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# [a<>]?n bANANas ANd ANANases iAN cANaAN
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# [an<61>]?n bANANas ANd ANANases iAN cANaAN
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#
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# [an]+n bANas ANd ANases in cAN
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# [a<>]+n bANANas ANd ANANases in cANAN
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# [an<61>]+n bananas and ananases in canaan
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# ----------------------------------------------------------------------
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#
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# Apparently the problem is specific to u-acute; I've tried several
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# other 8-bit characters and they seem to behave as expected.
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#
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# By comparing the second and third output lines, it would seem that the
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# problem involves backtracking out of a partial match of [...]* in
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# order to match the next sub-expression, when the latter begins with
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# one of the given characters.
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#
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#
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# All the best,
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#
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# --stolfi
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#
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# ------------------------------------------------------------------------
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# Jorge Stolfi | http://www.dcc.unicamp.br/~stolfi | stolfi@dcc.unicamp.br
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# Institute of Computing (formerly DCC-IMECC) | Wrk +55 (19)3788-5858
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# Universidade Estadual de Campinas (UNICAMP) | +55 (19)3788-5840
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# Av. Albert Einstein 1251 - Caixa Postal 6176 | Fax +55 (19)3788-5847
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# 13083-970 Campinas, SP -- Brazil | Hom +55 (19)3287-4069
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# ------------------------------------------------------------------------
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#
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# _______________________________________________
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#
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#
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