Many thanks for the quick fix.
As to the *⍎* issue, I'm using libapl in a limited context as an
embedded expression evaluator and not as a full-fledged APL environment,
so maybe the issue won't bite me. I expect I'll find out later today.
Thanks again,
Chris
On 1/1/21 7:24 AM, Dr. Jürgen Sauermann wrote:
Hi Chris,
fixed in *SVN 1400*.
However, please note the following:
In GNU APL, you may, in principle, execute commands with ⍎ which is a
non-standard
APL extension. I have tested your case with both *⍎')LOAD wsname'*and
with *⍎')COPY wsname'
*instead of libapl. The first test failed while the second case succeeded.
The reason why the first case failed was because ⍎ of commands is only
allowed for commands that do not modify the *)SI *stack (otherwise
hell would brake loose). Now, *)LOAD* modifies the *)SI* stack
while*)COPY*
does not. Since not allowing *)LOAD* would be somewhat weird, it
is not entirely rejected, but does an automatic *)SIC* before it is
being executed.
This )SIC is necessary (since after it a )LOAD does no longer modify
the )SI stack)
but invisible to the user. As a consequence, the result of an
assignment like
*Q←**⍎')LOAD wsname'*gets lost because an error occurs before the
assignment takes place
and right after the error the *)SI* stack is cleared (which hides the
error from the user).
I suppose that *libapl* behaves somewhat differently because it
performs the command
directly instead of using ⍎, but the problem remains the same. The
assignment of the
)LOAD command output is done in the old workspace which is )CLEARed before
the *)LOAD* proceeds and may therefore be lost. The commands which do
an automatic
*)SIC* are:*)LOAD*, *)QLOAD*, *)CLEAR* (aka. *)RESET*) and *)SIC*.
Best Regards,
Jürgen
On 12/31/20 8:59 PM, Chris Moller wrote:
Being some combination of sadistic and masochistic, I'm trying to use
the libapl library using the libapl.h API
libapl.h says
/// Pass `command` to the command processor and return its output.
extern const char * apl_command(const char * command_utf8);
but when I do
const char *rc = apl_command (")load workspace");
it dumps
SAVED 2020-12-30 17:18:13 (GMT-4)
to stdout and rc is empty.
Am I doing something wrong, or am I trying to do something APL was
never intended to do? I'd like to be able to capture everything
libapl says and not have it go to stdout/stderr.
--cm
