[Issue 3409] stdio.File.seek() doesn't work for files >2GB

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3409


Andrei Alexandrescu <andrei at metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |andrei at metalanguage.com
         AssignedTo|nobody at puremagic.com        |andrei at metalanguage.com


--- Comment #3 from Andrei Alexandrescu <andrei at metalanguage.com> 2009-10-17 09:00:27 PDT ---
The bug is in druntime. It defines fseek and ftell in core.stdc.stdio like
this:

int    fseek(FILE* stream, long offset, int whence);
c_long ftell(FILE* stream);

And it defines c_long in core.stdc.config like this:


version( Windows )
{
    alias int   c_long;
    alias uint  c_ulong;
}
else
{
  static if( (void*).sizeof > int.sizeof )
  {
    alias long  c_long;
    alias ulong c_ulong;
  }
  else
  {
    alias int   c_long;
    alias uint  c_ulong;
  }
} 

I don't know why under Windows c_long is actually 32 bit.

Then, in my code I had this note:

    void seek(long offset, int origin = SEEK_SET)
    {
        enforce(p && p.handle,
                "Attempting to seek() in an unopened file");
        // @@@ Dubious: why is fseek in std.c.stdio taking an int???
        errnoEnforce(core.stdc.stdio.fseek(
                    p.handle, to!int(offset), origin) == 0,
                "Could not seek in file `"~p.name~"'");
    }

So it seeme like there was something fishy going on.

I emailed Sean about the problem. He needs to fix druntime, then I will fix
stdio, and then we can close this.

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