1258945Sroberto/* 2258945Sroberto * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC") 3258945Sroberto * Copyright (C) 2000, 2001 Internet Software Consortium. 4258945Sroberto * 5258945Sroberto * Permission to use, copy, modify, and/or distribute this software for any 6258945Sroberto * purpose with or without fee is hereby granted, provided that the above 7258945Sroberto * copyright notice and this permission notice appear in all copies. 8258945Sroberto * 9258945Sroberto * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 10258945Sroberto * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 11258945Sroberto * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 12258945Sroberto * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 13258945Sroberto * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 14258945Sroberto * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 15258945Sroberto * PERFORMANCE OF THIS SOFTWARE. 16258945Sroberto */ 17258945Sroberto 18258945Sroberto/* $Id: offset.h,v 1.6 2007/06/19 23:47:20 tbox Exp $ */ 19258945Sroberto 20258945Sroberto#ifndef ISC_OFFSET_H 21258945Sroberto#define ISC_OFFSET_H 1 22258945Sroberto 23258945Sroberto/* 24258945Sroberto * File offsets are operating-system dependent. 25258945Sroberto */ 26258945Sroberto#include <limits.h> /* Required for CHAR_BIT. */ 27258945Sroberto#include <sys/types.h> 28258945Sroberto 29258945Srobertotypedef _off_t isc_offset_t; 30258945Sroberto 31258945Sroberto/* 32258945Sroberto * POSIX says "Additionally, blkcnt_t and off_t are extended signed integral 33258945Sroberto * types", so the maximum value is all 1s except for the high bit. 34258945Sroberto * This definition is more complex than it really needs to be because it was 35258945Sroberto * crafted to keep both the SunOS 5.6 and the HP/UX 11 compilers quiet about 36258945Sroberto * integer overflow. For example, though this is equivalent to just left 37258945Sroberto * shifting 1 to the high bit and then inverting the bits, the SunOS compiler 38258945Sroberto * is unhappy about shifting a positive "1" to negative in a signed integer. 39258945Sroberto */ 40258945Sroberto#define ISC_OFFSET_MAXIMUM \ 41258945Sroberto (~(((off_t)-1 >> (sizeof(off_t) * CHAR_BIT - 1)) \ 42258945Sroberto << (sizeof(off_t) * CHAR_BIT - 1))) 43258945Sroberto 44258945Sroberto#endif /* ISC_OFFSET_H */ 45