45 lines
1.8 KiB
C
45 lines
1.8 KiB
C
/*
|
|
* 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 */
|