On Thu, Nov 12, 2009 at 11:41 AM, Ted Unangst <[email protected]> wrote: > > The harder way: Why are you casting an off_t to a size_t? >
I want to verify a file's size before mmap'ing it. The file holds a number of structs each of size size_t. I stat the file, compute records_n, then make sure the product of records_n and struct size is exactly equal to the file size. The ptrdiff_t question is similar: p0 = (mystruct *) mmap(...); if (p0 == -1) err(1, "boom!"); for (p = p0; p < p0 + records_n; p++) do_something_with(p); Is there a portable way to code these two tasks? Thanks for the suggestions on a mailing list. m
