Commit b02635aa authored by Danny Mayer's avatar Danny Mayer
Browse files

offset header

parent 1ee7ce8f
/*
* 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 1.2 2001/07/08 05:09:32 mayer 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 */
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