Re: source(builtin) and read(2)

[Clive D.W. Feather]

Paul Eggert said:
>> ptrdiff_t has to be able to hold the largest difference between two
>> pointers; it is a signed type.
> 
> The C standard does not require this.  It allows an implementation,
> for example, where size_t is 64 bits, ptrdiff_t is 32, and objects can
> be created with more than 2**32 bytes.  The behavior is undefined
> if you subtract two pointers into a same object and the resulting
> value does not fit into ptrdiff_t.  See section 6.5.6 of the standard.

True. My bad.

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