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On Sat, Jun 19, 2021 at 02:44:46PM +0200, Denys Vlasenko wrote:
>
> CTLVAR and CTLBACKQ are not properly handled if encountered
> inside {$#...}. Testcase:
>
> dash -c "`printf 'echo ${#1\x82}'`" 00 111 222
>
> It should execute "echo ${#1 <byte 0x82> }" and thus print "3"
> (the length of $1, which is "111").
>
> Instead, it segfaults.
>
> (Ideally, it should fail since "1 <byte 0x82>" is not a valid
> variable name, but currently dash accepts e.g. "${#1abc}"
> as if it is "${#1}bc". A separate, less serious bug...).
In fact these two bugs are one and the same. This patch fixes
both by detecting the invalid substitution and not emitting it
into the node tree.
Incidentally this reveals a bug in how we parse ${#10} that got
introduced recently, which is also fixed here.
Reported-by: Denys Vlasenko <vda.linux@googlemail.com>
Fixes: 7710a926b321 ("parser: Only accept single-digit parameter...")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch adds assignment built-in support that used to exist
in dash prior to 0.3.8-15. This is because it will soon be part
of POSIX, and the semantics are now much better defined.
Recognition is done at execution time, so even "command -- export"
or "var=export; command $var" should work.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On Sun, Apr 10, 2011 at 07:36:49AM +0000, Jonathan Nieder wrote:
> From: Jilles Tjoelker <jilles@stack.nl>
> Date: Sat, 13 Jun 2009 16:17:45 -0500
>
> This change only affects strings passed to -c, when the -s option is
> not used.
>
> Use the EV_EXIT flag to inform the eval machinery that the string
> being passed is the entirety of input. This way, a fork may be
> omitted in many special cases.
>
> If there are empty lines after the last command, the evalcmd will not
> see the end early enough and forks will not be omitted. The same thing
> seems to happen in bash.
>
> Example:
> sh -c 'ps lT'
> No longer shows a shell process waiting for ps to finish.
>
> [jn: ported from FreeBSD SVN r194128. Bugs are mine.]
>
> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Instead of detecting EOF using the input layer, I'm going to
use the parser instead. In either case, we always have to read
ahead in order to complete the parsing of the previous node.
Therefore we always know whether there is more to come, except
in the case where we see a newline/semicolon or similar.
For the purposes of sh -c, this should be sufficient.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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This patch improves LINENO support by storing line numbers in the parse
tree, for commands as well as for function definitions. It makes LINENO
behaves properly when calling functions, and has the added benefit of
improved line numbers in error messages when the last-parsed command is
not the last-executed one. It removes the earlier LINENO support, and
instead sets LINENO from evaltree when a command is executed
Signed-off-by: Harald van Dijk <harald@gigawatt.nl>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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On Tue, Oct 30, 2007 at 04:23:35AM +0000, Oleg Verych wrote:
>
> } 8<<""
> ======================
Actually this (the empty delim) only works with dash by accident.
I've tried bash and pdksh and they both terminate on the first
empty line which is what you would expect rather than EOF. The
real Korn shell does something completely different.
I've fixed this in dash to conform to bash/pdksh.
> In [0] it's stated, that delimiter isn't evaluated (expanded), only
> quoiting must be checked. That if() seems to be completely bogus.
OK I agree. The reason it was there is because the parser would
have already replaced the dollar sign by an internal representation.
I've fixed it properly with this patch.
Test case:
cat <<- $a
OK
$a
cat <<- ""
OK
echo OK
Old result:
dash: Syntax error: Illegal eof marker for << redirection
OK
echo OK
New result:
OK
OK
OK
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Because the parser does not recursively parse parameter expansion with respect
to quotes, we can't accurately determine quote status at parse time. This
patch works around this by moving the quote detection to run-time where we
do interpret it recursively.
Test case:
foo=\\
echo "<${foo#[\\]}>"
Old result:
<\>
New result:
<>
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The value for CTLBACKQ | CTLQUOTE is now -123, not 133.
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The existing scheme of using the native char for syntax array indicies
makes cross-compiling difficult. Therefore it makes sense to choose
one specific sign for everyone.
Since signed chars are native to most platforms and i386, it makes more
sense to use that if we are to choose one type for everyone.
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This change updates the BSD licence to the three-clause version since
NetBSD has already done so. This makes dash GPL-compatible.
It also adds Christos Zoulas (NetBSD ash maintainer) to the COPYING file.
I've added "copyright by Herbert Xu" to most files.
Finally all CVS IDs and inclusion of sys/cdefs.h have been removed.
The latter is needed for support of klibc.
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