A strange quoted nested evaluation issue

A strange quoted nested evaluation issue

[Ian F]

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Hi,

Can anyone shed some light On This One?

tl;dr: Enclosing a nested length eval on an empty var changes its answer
from 0 to 1 when in double quotes.

% for baz in "" "inga"; do
echo ${#${baz}} "${#${baz}}" ${#baz} "${#baz}"
done
0 1 0 0
4 4 4 4
%

Normally I wouldn't mail the list about this kind of thing, but this one's
just too weird.  Thoughts?

%Ian

-
Ian F
plus one, seven oh seven, seven three seven, four twenty-one zero.

Big hitter, the Lama.

Re: A strange quoted nested evaluation issue

[dana]

On 19 Nov 2018, at 02:04, Ian F <in4mer@gmail.com> wrote:
>Normally I wouldn't mail the list about this kind of thing, but this one's
>just too weird.  Thoughts?

It's counting a Nularg (0xa1). And it's not just a problem there; try e.g.
"${(g<>)${baz}}" or "${(l<3><x>)${baz}}". Not sure where the best place to fix
it is though

dana

Re: A strange quoted nested evaluation issue

[Peter Stephenson]

On Mon, 2018-11-19 at 12:39 -0600, dana wrote:
> On 19 Nov 2018, at 02:04, Ian F <in4mer@gmail.com> wrote:
> > 
> > Normally I wouldn't mail the list about this kind of thing, but this one's
> > just too weird.  Thoughts?
> It's counting a Nularg (0xa1). And it's not just a problem there; try e.g.
> "${(g<>)${baz}}" or "${(l<3><x>)${baz}}". Not sure where the best place to fix
> it is though

Right.

This, I think.

pws

diff --git a/Src/subst.c b/Src/subst.c
index c706b96..ff6750a 100644
--- a/Src/subst.c
+++ b/Src/subst.c
@@ -2405,6 +2405,8 @@ paramsubst(LinkList l, LinkNode n, char **str, int qt, int pf_flags,
 	    aspar = 0;
 	} else if (aspar)
 	    idbeg = val;
+	if (*val == Nularg)
+	    ++val;
 	*s = sav;
 	/*
 	 * This tests for the second double quote in an expression