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bug#51669: some patterns which should match 0x0 don’t do so
From: |
Christoph Anton Mitterer |
Subject: |
bug#51669: some patterns which should match 0x0 don’t do so |
Date: |
Sun, 07 Nov 2021 17:56:56 +0100 |
User-agent: |
Evolution 3.42.0-2 |
Hey.
Maybe this is no a bug at all due grep rather being focused on text
files and 0x0 being special anyway, but just for your information:
$ hd test-with-0x00-and-0x02
00000000 66 6f 6f 0a 62 61 72 0a 7a 65 02 00 0a 62 61 7a |foo.bar.ze...baz|
00000010 0a 7a 65 72 00 0a 65 6e 64 0a |.zer..end.|
0000001a
If one now does:
$ grep '[^[:alnum:][:space:][:punct:]]' test-with-0x00-and-0x02
grep: test-with-0x00-and-0x02: binary file matches
it matches, presumably only the 0x02, though.
Having only 0x00 in the file:
$ hd test-with-0x00-only
00000000 66 6f 6f 0a 62 61 72 0a 7a 65 72 00 0a 62 61 7a |foo.bar.zer..baz|
00000010 0a 7a 65 72 00 0a 65 6e 64 0a |.zer..end.|
0000001a
doesn’t cause a match:
$ grep '[^[:alnum:][:space:][:punct:]]' test-with-0x00-only
$
while naively I'd have assume that 0x00 should be matched as well.
Cheers,
Chris.
- bug#51669: some patterns which should match 0x0 don’t do so,
Christoph Anton Mitterer <=