There do seem to be anomalies in Cygwin handling of SMP characters, perhaps due
to conversion to or misinterpretation as UTF-16/UCS-2 surrogates?
🔍 U+01f50d f0 9f 94 8d d83d dd0d
🔎 U+01f50e f0 9f 94 8e d83d dd0e
$ wc -lwcmL <<< 🔎
1 0 3 5 0
$ wc -lwcmL <<< 🔍
1 0 3 5 0
On 2024-08-20 04:58, Ed Morton via Cygwin wrote:
Is there any more information I can provide for someone to be able to look into
this bug?
Ed.
On 7/6/2024 7:26 AM, Ed Morton wrote:
I posted the below bug report to the GNU awk bugs mailing list,
https://lists.gnu.org/archive/html/bug-gawk/2024-07/msg00000.html, the
feedback there is that it's a cygwin or MSYS2 port issue, could you please
take a look? I'm also posting this at
https://github.com/msys2/mingw-packages/issues per the advice from the GNU bug
list.
Regards,
Ed Morton.
-------- Forwarded Message --------
Subject: odd behavior of length(), match() and field splitting with
multi-byte characters
Date: Mon, 1 Jul 2024 05:56:02 -0500
From: Ed Morton
To: bug-g...@gnu.org <bug-g...@gnu.org>
Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: cygwin
Compiler: gcc
Compilation CFLAGS: -ggdb -O2 -pipe -Wall -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong --param=ssp-buffer-size=4
-fdebug-prefix-map=/cygdrive/d/a/scallywag/gawk/gawk-5.3.0-1.x86_64/build=/usr/src/debug/gawk-5.3.0-1 -fdebug-prefix-map=/cygdrive/d/a/scallywag/gawk/gawk-5.3.0-1.x86_64/src/gawk-5.3.0=/usr/src/debug/gawk-5.3.0-1 -DNDEBUG
uname output: CYGWIN_NT-10.0-22631 TournaMart_2023 3.5.3-1.x86_64 2024-04-03
17:25 UTC x86_64 Cygwin
Machine Type: x86_64-pc-cygwin
Gawk Version: 5.3.0
Attestation 1:
I have read
https://www.gnu.org/software/gawk/manual/html_node/Bugs.html.
Yes
Attestation 2:
I have not modified the sources before building gawk.
True
Description:
gawk is reporting odd lengths and matches of strings
when multi-byte characters are involved.
Repeat-By:
Someone on StackOverflow asked about a couple of issues they saw that,
so far at least, no-one there can explain and seem to just be bugs.
1)
https://stackoverflow.com/questions/78676444/conditional-replacement-of-arbitrarily-large-strings-that-occur-at-arbitrary-dis#comment138715434_78676444 and https://stackoverflow.com/questions/78676444/conditional-replacement-of-arbitrarily-large-strings-that-occur-at-arbitrary-dis#comment138720207_78676444:
If we output 4 multi-byte characters as 10 bytes using:
$ echo '61F09F948DF09F948E62' | xxd -r -p > file1
$
and run the following gawk command on it we get the output shown:
$ LC_ALL=en_US.utf8 gawk '{print(length($0))}' file1
6
$
i.e. 6 instead of 4. If we run
$ printf 'F0989A9F' | xxd -r -p | LC_ALL=en_US.utf8 awk -F ''
'{print NF, length(); for (i=1; i<=NF; i++) print $i}' | cat -A
2 2$
M-pM-^XM-^Z$
M-^_$
$
it shows that what is intended to be single a 4-byte character is
being treated as 2 characters, one 3 bytes and the other 1 byte.
2)
https://stackoverflow.com/questions/78690533/why-does-the-match-function-not-work-in-this-particular-situation
If we create some input using:
$ echo
'3C6469763E3C6469763E5F3C2F6469763E5F3C68313E6162636465665F3C2F68313E5F3C2F6469763E3C6469763EF09F93853C2F6469763E0A' | xxd -r -p > file2
and then run this on it we get the expected output shown::
$ LC_ALL=en_US.utf8 gawk '{match($0,/^.*_<h1>(.*)_<\/h1>.*$/,a);
print a[1]}' file2
abcdef
$
but if we add the `IGNORECASE` flag we get a blank line output:
$ LC_ALL=en_US.utf8 gawk -vIGNORECASE=1
'{match($0,/^.*_<h1>(.*)_<\/h1>.*$/,a); print a[1]}' file2
$
unless we also remove the end of string delimiter, `$`, from the end
of the regexp:
$ LC_ALL=en_US.utf8 gawk -vIGNORECASE=1
'{match($0,/^.*_<h1>(.*)_<\/h1>.*/,a); print a[1]}' file2
abcdef
$
--
Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
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