From: cis.ohio-state.edu!math.ohio-state.edu!sol.ctr.columbia.edu!caen!saimiri. primate.wisc.edu!aplcen.apl.jhu.edu!ddsdx2.jhuapl.edu!dlc@ucbvax.Berkeley.EDU (Dave Collard x7468)
Subject: Re: How to reset 'end_error' using text_io?
Date: 27 Aug 93 13:03:47 GMT [thread overview]
Message-ID: <1993Aug27.130347.3911@aplcen.apl.jhu.edu> (raw)
In <1993Aug27.023237.20864@seas.gwu.edu> mfeldman@seas.gwu.edu (Michael Feldman
) writes:
>In article <25h05c$3lv@neomimsy.cs.umd.edu> alex@cs.umd.edu (Alex Blakemore) w
rites:
>>In article <fmoore.8@dseg.ti.com> fmoore@dseg.ti.com (Freeman L. Moore) write
s:
>>> So, how can io_exceptions.end_error on standard input be cleared
>>> permitting subsequent GETs to continue reading?
>>
>>text_io.skip_line I believe.
>>--
>Would that it were (portably) so. Trouble is, that the End_Error was
>raised because you bumped into EOF, which has a nasty tendency of causing
>the file to be closed. And since you can't reopen Standard_Input, you
>are stuck, at least in my experience (your implementation mileage may
>vary).
Hmmm. you cant reopen standard_input, but you can reopen a file with
the same name as it (see below);
>My guess is that if you really need to do this, you could open the
>file as a named file associated with the device. Then you could (maybe)
>Reset it. We had this discussion on the net about a year ago when my
So is my solution portable?? anyone who can try it on their machines?
it works on the VAX:
with text_io;
procedure enderror is
buf : string(1..80); last : natural;
f : text_io.file_type;
begin
text_io.open(file => f,
mode => text_io.in_file,
name => text_io.name(text_io.standard_input));
text_io.set_input(f);
loop
begin
text_io.get_line(buf, last);
text_io.put_line("got " & buf(1..last));
exception
when text_io.end_error =>
text_io.reset(f);
end;
end loop;
end;
thanks to R_Tim_Coslet@cup.portal.com for suggesting reset(f)
instead of close(f), open(...)
thanks to Alex Blakemore for pointing out that i was getting
the name of standard_output instead of input (which was
the same on the vax normally)
--Thor
dlc@ddsdx2.jhuapl.edu
next reply other threads:[~1993-08-27 13:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
1993-08-27 13:03 Dave Collard x7468 [this message]
-- strict thread matches above, loose matches on Subject: below --
1993-08-27 15:22 How to reset 'end_error' using text_io? Keith Shillington
1993-08-27 12:50 cis.ohio-state.edu!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.
1993-08-27 3:01 dog.ee.lbl.gov!agate!spool.mu.edu!howland.reston.ans.net!europa.eng.gtefs
1993-08-27 2:32 Michael Feldman
1993-08-26 20:42 Dave Colla rd x7468
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