offset.h revision b02635aa753c419c2c505467e01e4400130acffe
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * Copyright (C) 2000, 2001 Internet Software Consortium.
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * Permission to use, copy, modify, and distribute this software for any
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * purpose with or without fee is hereby granted, provided that the above
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * copyright notice and this permission notice appear in all copies.
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer/* $Id: offset.h,v 1.2 2001/07/08 05:09:32 mayer Exp $ */
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * File offsets are operating-system dependent.
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * POSIX says "Additionally, blkcnt_t and off_t are extended signed integral
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * types", so the maximum value is all 1s except for the high bit.
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * This definition is more complex than it really needs to be because it was
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * crafted to keep both the SunOS 5.6 and the HP/UX 11 compilers quiet about
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * integer overflow. For example, though this is equivalent to just left
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * shifting 1 to the high bit and then inverting the bits, the SunOS compiler
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer * is unhappy about shifting a positive "1" to negative in a signed integer.
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer (~(((off_t)-1 >> (sizeof(off_t) * CHAR_BIT - 1)) \
b02635aa753c419c2c505467e01e4400130acffeDanny Mayer#endif /* ISC_OFFSET_H */