[DGD] string indexing..

[Bart van Leeuwen]

Hmm.. it seems to me that doing something like "blah"[0..-1] should result
in an invalid string range error, but it does not, it results in an empty
string (checked on dgd 1.1, 1.2p3).

Looking through str.c in various versions points at str_ckrange and
str_range.
The particular issue is checking on l1 > l2 + 1, which should either be
l1 > l2 or l1 >= l2 + 1 (why would you write it like that anyway?)

Was wondering for a sec if it was a feature, but theres cleaner ways to
get an empty string I figured so I guess it is a bug :)

Btw, I ended up there because I wanted to get indexing from the end of a
string working (ie, str[0..-3] is short for str[0..strlen(str)-3] (oh, and
a bit faster also of course), and besides, I like the driver just
returning an empty string instead of throwing a runtime error when trying
to index past the end of the string ;) (and I ended up there due to
wanting a much closer emulation of lpmud, but more about that later maybe)

Anyway, if people are interested I will cleanup the code for it a bit and
make a patch available. It seems to work with all I threw at it, but
wasn't tested very extensively yet.

Bart.

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