[Gretl-users] problems with windows snapshot
cottrell at wfu.edu
Sun Jun 21 09:49:20 EDT 2009
On Sun, 21 Jun 2009, Sven Schreiber wrote:
> Am 19.06.2009 16:24, Allin Cottrell schrieb:
> > On Fri, 19 Jun 2009, Klein, Christoph wrote:
> >> I've downloaded the windows snapshot (1.8.1cvs 2009-06-18) this
> >> morning. It seems to have problems when decrementing scalars.
> >> The following programm fails
> >> nulldata 10
> >> scalar d=1
> >> d-=1
> >> in the last line, saying "command d unknown"...
> > Hmm, I can reproduce this using gretlcli.exe under wine on Linux.
> > But I note that substituting "d -=1" works OK. I'll investigate;
> > strange that this sort of thing should differ by OS.
> Indeed! So I'm curious, what's the explanation that you seem to have
> found, given that it's fixed now?
It was actually a gretl bug: the code just "happened to work" on
Linux but not win32. In parsing the sort of line in question we
need to extract the leading characters that are _not_ in the set
"[ +*/%^~|=-" to get a command word or variable name:
sscanf(s, "%15[^[ +*/%^~|=-]", word);
However, I had forgotten to put '-' at the end of this set, right
before the closing ']'. If '-' appears somewhere in the middle
(as it did until this fix) it has a special meaning, namely
designating a range of characters, as in "a-z".
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