> ... are you by any chance doing anything with strings
> that you got back from Postgres? I found that it is dangerous to
> treat such strings as shareable. Specifically, I found that
>
> (use-modules (database postgres))
> (use-modules (ice-9 string-fun))
> ...
> (sans-surrounding-whitespace (pg-getvalue dataset row col))
>
> would cause mysterious errors later in the program.
This is the first time I've heard of such a problem.
> But if I use a private copy of sans-surrounding-whitespace, in which
> `make-shared-substring'
[now deprecated]
> is replaced by `substring', the program
> behaves correctly.
You should have reported this as a bug in guile or guile-pg.
Indeed - my apologies.
I've checked the guile-pg code and I can't see a problem: the return
value from pg_getvalue is a guile string created by either a call to
scm_makfromstr (possibly via scm_makfrom0str). This copies the string
pointed to by the return value from the postgres client library into a
freshly allocated (from scm_makstr) guile string. Thereafter it
should behave as any guile string does.
Does anybody know of any bugs with shared substrings in 1.4?
I think I was using pre-1.4 Guile when I observed this behaviour. If
I get time, I will try to
- reproduce the behaviour with pre-1.4 Guile, and investigate further
- see whether I still get strange behaviour if I revert to the
distributed version of string-fun.scm with current CVS Guile.
Regards,
Neil
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