From: Eric Dahlman <edahlman@atcorp.com>
To: caml-list@pauillac.inria.fr
Subject: [Caml-list] Bug with really_input under cygwin
Date: Tue, 9 Mar 2004 16:30:08 -0600 [thread overview]
Message-ID: <51FE3429-7219-11D8-8BF5-000393914EAA@atcorp.com> (raw)
Howdy all,
I have some code which is reads in a whole file in and returns it as a
string. To do this I am using a combination of in_channel_length and
really_input which has worked just fine in a Unix environment but which
breaks under Cygwin. This looks like a problem with line ending
translation where the length reported by in_channel_length counts the
DOS line endings as two characters but really_input reads them in as
one. The end result is the length is too long by the number of
newlines in the file and the call to really_input fails.
Here is a function which demonstrates the problem
let measureUp () =
let (name, channel) = Filename.open_temp_file "temp" ".foo" in
List.iter (fun x -> output_string channel x)
[ "This\n" ; "is\n" ; "a\n" ; "spiffy\n" ; "test\n" ];
close_out channel;
(* now read it back in *)
let ins = open_in name in
let length = in_channel_length ins in
let result = String.create length in
really_input ins result 0 length;
close_in ins;
Unix.unlink name;
result
This function works fine under Unix but will fail under Cygwin. I have
tried to use set_binary_mode_* to see if that would help but it did not
alter the the results. So that leaves me with a couple of questions:
How should I slurp a whole file into a string portably in ocaml?
Is this a bug or just and unfortunate result of running under windows?
(At the very least it is a documentation bug.)
Going back to the original problem that started me down this road is
there an analogue to string-streams in common lisp which are special
output channels which write to a string in memory rather than a file on
disk?
Thanks a bunch!
-Eric
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next reply other threads:[~2004-03-09 22:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-09 22:30 Eric Dahlman [this message]
2004-03-09 22:52 ` Karl Zilles
2004-03-10 3:06 ` skaller
2004-03-10 4:10 ` David Brown
2004-03-10 13:14 ` Richard Zidlicky
2004-03-11 4:11 ` skaller
2004-03-11 3:24 ` skaller
2004-03-10 15:25 ` Nuutti Kotivuori
2004-03-11 3:42 ` skaller
2004-03-11 5:02 ` Nuutti Kotivuori
2004-03-11 15:21 ` skaller
2004-03-11 6:32 ` james woodyatt
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