47 lines
1.8 KiB
C
47 lines
1.8 KiB
C
/* $NetBSD: offset.h,v 1.1.1.1 2003/12/04 16:05:22 drochner Exp $ */
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/*
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* Copyright (C) 2000, 2001 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Id: offset.h,v 1.10 2001/01/09 21:58:43 bwelling Exp */
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#ifndef ISC_OFFSET_H
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#define ISC_OFFSET_H 1
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/*
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* File offsets are operating-system dependent.
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*/
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#include <limits.h> /* Required for CHAR_BIT. */
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#include <sys/types.h>
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typedef off_t isc_offset_t;
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/*
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* POSIX says "Additionally, blkcnt_t and off_t are extended signed integral
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* types", so the maximum value is all 1s except for the high bit.
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* This definition is more complex than it really needs to be because it was
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* crafted to keep both the SunOS 5.6 and the HP/UX 11 compilers quiet about
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* integer overflow. For example, though this is equivalent to just left
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* shifting 1 to the high bit and then inverting the bits, the SunOS compiler
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* is unhappy about shifting a positive "1" to negative in a signed integer.
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*/
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#define ISC_OFFSET_MAXIMUM \
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(~(((off_t)-1 >> (sizeof(off_t) * CHAR_BIT - 1)) \
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<< (sizeof(off_t) * CHAR_BIT - 1)))
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#endif /* ISC_OFFSET_H */
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