From: Brian Candler <B.Candler@...>
Date: 2007-08-15T18:39:10+09:00
Subject: Re: IO#seek and whence problem

On Wed, Aug 15, 2007 at 05:38:38PM +0900, Bertram Scharpf wrote:
> I completely turned off optimization and distcc.
> 
> In <io.c> I put the following debug statements:
> 
>   static VALUE
>   rb_io_seek(io, offset, whence)
>       VALUE io, offset;
>       int whence;
>   {
>       OpenFile *fptr;
>       off_t pos;
> 
>       fprintf( stderr, "rb_io_seek: A; whence=%d\n", pos, whence);

Two arguments, one format specifier?

>       pos = NUM2OFFT(offset);
>       fprintf( stderr, "rb_io_seek: B; pos=%d, whence=%d\n", pos, whence);

Remember that %d consumes an 'int', and off_t may be larger than int on your
platform.

This is safer:

fprintf( stderr, "rb_io_seek: B; pos=%ld, whence=%d\n", (long)pos, whence);