Re: File names and ChDir

2 Apr 2004


      Emil Jerabek wrote:
...
On Fri, Apr 02, 2004 at 12:59:30PM +0200, Frank Heckenbach wrote:
...
Hi,
there's a strange case when using relative file names and changing
the directory. (Incidentally I was made aware of this by a bugfix in
the ncurses library (C code) some while ago ... ;-) Consider this
program:
program Foo;
var
  i: Integer;
  f: Text;
begin
  Assign (f, 'test.dat');
  Rewrite (f);
  WriteLn (f, 42);
  Close (f);
  ChDir ('..');
  Reset (f);
  ReadLn (f, i);
  WriteLn (i)
end.
It fails under both GPC and BP because `Reset' tries to open a file
`test.dat' in a different directory than it was created.
[...]
...
How do other compilers behave? What would be the expected behaviour
of code like above if it actually occurs in practice?
Frank
IMHO this is quite natural. There's no reason to close the file if
I want its "identity" to be preserved.
I'm not sure. I'd rather consider `Assign' to be "identity giving"
in this context. BTW, without closing it works under GPC and still
fails under BP.

Frank

-- 
Frank Heckenbach, frank@g-n-u.de, http://fjf.gnu.de/, 7977168E
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