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