CVS commit: src/bin/ksh

[Alan Barrett <apb%netbsd.org@localhost>]

Module Name:    src
Committed By:   apb
Date:           Mon Oct 27 19:52:28 UTC 2008

Modified Files:
        src/bin/ksh: ksh.Man lex.c

Log Message:
In foo="`echo \"hi\"`", the backslashes should be removed by the outer
double quotes, not seen by the inner backquotes.  Previously, ksh(1)
handled this correctly in non-posix mode but incorrectly in posix mode.

The previous comments in src/bin/ksh/lex.c quote parts of some version
of the POSIX specification.  The version of POSIX being quoted is not
identified, but the wording is very similar to that in SUSv3
<http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html>.

It seems clear that the words "having escape characters removed"
mean, in that context, that the backslash before the double quote in
"...`...\"...`..." is removed as part of the handling of the outer
double quotes, so that the backslash is not present when the inner
backquotes are handled.  The new code in this commit follows this
interpretation.  The previous code followed a different interpretation
which is now believed to be incorrect.

Discussed in tech-userlevel.  Closes PR 26493.


To generate a diff of this commit:
cvs rdiff -r1.20 -r1.21 src/bin/ksh/ksh.Man
cvs rdiff -r1.12 -r1.13 src/bin/ksh/lex.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.