From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Out_File , excess line
Date: Sun, 31 Jan 2016 13:57:30 +0100
Date: 2016-01-31T13:57:30+01:00 [thread overview]
Message-ID: <n8l0bp$4de$1@gioia.aioe.org> (raw)
In-Reply-To: lya8nmuh2h.fsf@pushface.org
On 2016-01-31 12:25, Simon Wright wrote:
> The standard solution to copying a file would be
>
> with Ada.Text_IO; use Ada.Text_IO;
No, that does not copy a file. That 1) interprets a file context as a
text file specific to the given operating system and then 2) writes the
interpretation into another file. So it is a file conversion.
One solution to copy a file is using Copy_File from Ada.Directories.
Another is using Ada.Streams.Stream_IO. Both are not ideal but will work
in most cases.
E.g. your example with Ada.Streams.Stream_IO:
with Ada.Exceptions; use Ada.Exceptions;
with Ada.Streams; use Ada.Streams;
with Ada.Streams.Stream_IO; use Ada.Streams.Stream_IO;
with Ada.Text_IO;
procedure Fanzine is
Buffer_Size : constant := 1024; -- Or more
Input_File : File_Type;
Output_File : File_Type;
Buffer : Stream_Element_Array (1..Buffer_Size);
Last : Stream_Element_Offset;
Count : Stream_Element_Count := 0;
begin
Open (Input_File, In_File, "fanzine.adb");
begin
Create (Output_File, Out_File, "fanzine.adb.copy");
loop
Read (Input_File, Buffer, Last);
exit when Last < Buffer'First;
Count := Count + Last;
Write (Output_File, Buffer (Buffer'First..Last));
end loop;
exception
when End_Error =>
null; -- Never here
end;
Close (Output_File);
Close (Input_File);
Ada.Text_IO.Put_Line
( "Written" & Stream_Element_Count'Image (Count) & " elements"
);
exception
when Error : others =>
Ada.Text_IO.Put_Line ("Error " & Exception_Information (Error));
end Fanzine;
It is quite simple, if necessary, to detect line ends in a manner
compatible with both Windows and Linux systems, given fixed encoding.
(Doing that independently of the encoding would probably be impossible,
but who cares?)
--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de
next prev parent reply other threads:[~2016-01-31 12:57 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-20 1:39 Out_File , excess line comicfanzine
2016-01-20 11:23 ` AdaMagica
2016-01-20 13:31 ` comicfanzine
2016-01-20 14:03 ` comicfanzine
2016-01-20 14:26 ` Dmitry A. Kazakov
2016-01-20 17:33 ` AdaMagica
2016-01-21 4:50 ` comicfanzine
2016-01-21 10:27 ` Jacob Sparre Andersen
2016-01-21 10:56 ` AdaMagica
2016-01-21 11:57 ` G.B.
2016-01-21 14:42 ` Dmitry A. Kazakov
2016-01-21 16:23 ` AdaMagica
2016-01-22 2:50 ` Dennis Lee Bieber
2016-01-21 13:38 ` Dennis Lee Bieber
2016-01-21 17:30 ` comicfanzine
2016-01-22 1:56 ` comicfanzine
2016-01-22 12:28 ` Brian Drummond
2016-01-22 20:01 ` comicfanzine
2016-01-23 20:06 ` comicfanzine
2016-01-27 9:26 ` Simon Wright
2016-01-27 19:32 ` Simon Wright
2016-01-27 21:31 ` Jeffrey R. Carter
2016-01-27 20:28 ` Dmitry A. Kazakov
2016-01-24 16:11 ` comicfanzine
2016-01-25 21:54 ` comicfanzine
2016-01-25 22:01 ` MM
2016-01-26 0:50 ` comicfanzine
2016-01-26 10:10 ` comicfanzine
2016-01-27 3:57 ` comicfanzine
2016-01-27 8:13 ` AdaMagica
2016-01-28 4:35 ` comicfanzine
2016-01-29 23:04 ` comicfanzine
2016-01-30 9:44 ` Simon Wright
2016-01-30 10:43 ` AdaMagica
2016-01-30 13:51 ` Simon Wright
2016-01-31 8:56 ` comicfanzine
2016-01-31 11:25 ` Simon Wright
2016-01-31 12:57 ` Dmitry A. Kazakov [this message]
2016-01-31 17:00 ` Simon Wright
2016-01-31 11:51 ` AdaMagica
2016-02-01 6:22 ` comicfanzine
2016-02-01 8:32 ` Dmitry A. Kazakov
2016-02-09 15:07 ` comicfanzine
2016-02-09 17:00 ` Dmitry A. Kazakov
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