CVS commit: src

["Robert Elz" <kre%netbsd.org@localhost>]

Module Name:    src
Committed By:   kre
Date:           Sat May  4 02:52:22 UTC 2019

Modified Files:
        src/bin/sh: parser.c
        src/tests/bin/sh: t_expand.sh

Log Message:
Fix an (apparent) ancient ash bug, that was apparently fixed sometime
in the past, but managed to re-surface...

The expression "${0+\}}" should expand to "}" not "\}"
Almost all other shells handle it that way (incl FreeBSD & dash).

Issue pointed out by Martijn Dekker.

Add ATF sub-tests for the 4 old var expand operators (${var+word}
${var-word} ${var-word} and ${var?word} - including the forms
with the ':' included) and amongst those tests include test cases
for this issue, so if the bug tries to appear again, we can squash
it quicker.   (The newer pattern matching operators are already
well tested as part of testing patterns.)


To generate a diff of this commit:
cvs rdiff -u -r1.167 -r1.168 src/bin/sh/parser.c
cvs rdiff -u -r1.21 -r1.22 src/tests/bin/sh/t_expand.sh

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