Bug 236900

Summary: impossible to transliterate escaped backslash
Product: Red Hat Enterprise Linux 3 Reporter: Josef Kubin <jkubin>
Component: sedAssignee: Petr Machata <pmachata>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 3.0CC: mnewsome
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2007-05-09 04:21:01 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Fix for RHEL-3 none

Description Josef Kubin 2007-04-18 11:27:37 UTC 
Description of problem:
.qa.[root@i386-3as tps]# echo aka | sed 'y,a,\\,'
sed: -e expression #1, char 7: strings for y command are different lengths

Version-Release number of selected component (if applicable):
sed-4.0.7-9.el3.i386

How reproducible:
always
Comment 1 Petr Machata 2007-04-18 13:42:27 UTC 
Created attachment 152905 [details]
Fix for RHEL-3

Fix for this problem.

$ locale | grep LANG
LANG=C
$ echo abcd | ./sed-4.0.7/sed/sed 'y,abcd,\\\t\,!,'
\	,!

$ locale | grep LANG
LANG=cs_CZ.utf8
$ echo abcd | ./sed-4.0.7/sed/sed 'y,abcd,\\\t\,!,'
\	,!

Also works the other way around:
$ echo -e '\\\t,!' | ./sed-4.0.7/sed/sed 'y,\\\t\,!,abcd,'
abcd
Comment 5 Josef Kubin 2007-04-25 12:19:33 UTC 
escaped characters are hopelessly buggy ...

.qa.[root@ia64-3as tps]# echo -e 'ata' | sed 'y,t,\k,'
sed: -e expression #1, char 7: strings for y command are different lengths
.qa.[root@ia64-3as tps]# echo -e 'ata' | sed 'y,t,\x,'
axa
.qa.[root@ia64-3as tps]#
Comment 6 Petr Machata 2007-04-25 13:04:42 UTC 
This:
  echo -e 'ata' | sed 'y,t,\x,'
behaves as expected.  \x is "hexadecimal escape", given sane argument:
  $ echo 'xyz' | ./sed-4.0.7/sed/sed 'y/y/\x20/'
  x z
If the argument is not provided, backslash is simply ignored.  This is
consistent with latest upstream. E.g. echo does something similar:
  $ echo -e 'a\x20\x'
  a \x

The \k case is resolved by the attached patch in a manner consistent with
upstream: unresolved escapes are taken as if backslash was not there.
Comment 8 RHEL Program Management 2007-05-09 04:21:02 UTC 
Product Management has reviewed and declined this request.  You may appeal this
decision by reopening this request.