1/* $NetBSD: offset.h,v 1.1.1.1 2009/12/13 16:54:38 kardel Exp $ */ 2 3/* 4 * Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (C) 2000, 2001 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20/* Id: offset.h,v 1.15.332.2 2009/02/16 23:47:15 tbox Exp */ 21 22#ifndef ISC_OFFSET_H 23#define ISC_OFFSET_H 1 24 25/*! \file 26 * \brief 27 * File offsets are operating-system dependent. 28 */ 29#include <limits.h> /* Required for CHAR_BIT. */ 30#include <sys/types.h> 31#include <stddef.h> /* For Linux Standard Base. */ 32 33typedef off_t isc_offset_t; 34 35/*% 36 * POSIX says "Additionally, blkcnt_t and off_t are extended signed integral 37 * types", so the maximum value is all 1s except for the high bit. 38 * This definition is more complex than it really needs to be because it was 39 * crafted to keep both the SunOS 5.6 and the HP/UX 11 compilers quiet about 40 * integer overflow. For example, though this is equivalent to just left 41 * shifting 1 to the high bit and then inverting the bits, the SunOS compiler 42 * is unhappy about shifting a positive "1" to negative in a signed integer. 43 */ 44#define ISC_OFFSET_MAXIMUM \ 45 (~(((off_t)-1 >> (sizeof(off_t) * CHAR_BIT - 1)) \ 46 << (sizeof(off_t) * CHAR_BIT - 1))) 47 48#endif /* ISC_OFFSET_H */ 49