/contrib/ntp/include/isc/offset.h
https://bitbucket.org/freebsd/freebsd-head/ · C++ Header · 44 lines · 9 code · 6 blank · 29 comment · 0 complexity · 08984dbd261752715a49aa903c900a9c MD5 · raw file
- /*
- * 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 */