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(INPUT_BLOCK_SLOP, OUTPUT_BLOCK_SLOP): New macros. (MAX_BLOCKSIZE): Now accepts an arg. All uses changed. (page_size): New var. (scanargs, skip, main): Use more-straightforward way to detect overflow. (dd_copy): Use page_size rather than invoking getpagesize. Use INPUT_BLOCK_SLOP, OUTPUT_BLOCK_SLOP. (main): Set page_size. Avoid a call to stat in the usual case where ftruncate succeeds.