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redefined ISC_OFFSET_MAXIMUM

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This commit is contained in:
David Lawrence
2000-06-06 22:10:10 +00:00
parent b3ef06344a
commit 5fda9ca75a
1 changed files with 9 additions and 4 deletions
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13
lib/isc/unix/include/isc/offset.h
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@@ -15,7 +15,7 @@
* SOFTWARE.
*/
/* $Id: offset.h,v 1.5 2000/05/25 16:44:25 tale Exp $ */
/* $Id: offset.h,v 1.6 2000/06/06 22:10:10 tale Exp $ */
#ifndef ISC_OFFSET_H
#define ISC_OFFSET_H 1
@@ -31,9 +31,14 @@ 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.
* 1 is sized as an unsigned long long to keep the Solaris 5.6 compiler
* from complaining about integer overflow from the left shift.
* 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)~(1ULL << (sizeof(off_t) * CHAR_BIT - 1)))
#define ISC_OFFSET_MAXIMUM \
(~(((off_t)-1 >> (sizeof(off_t) * CHAR_BIT - 1)) \
<< (sizeof(off_t) * CHAR_BIT - 1)))
#endif /* ISC_OFFSET_H */