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made operand to left shift in ISC_OFFSET_MAXIMUM unsigned to avoid

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integer overflow.
This commit is contained in:
David Lawrence
2000-05-25 16:44:25 +00:00
parent 11836b7a55
commit 05e3940191
1 changed files with 4 additions and 2 deletions
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6
lib/isc/unix/include/isc/offset.h
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@@ -15,7 +15,7 @@
* SOFTWARE. * SOFTWARE.
*/ */
/* $Id: offset.h,v 1.4 2000/05/25 03:34:34 tale Exp $ */ /* $Id: offset.h,v 1.5 2000/05/25 16:44:25 tale Exp $ */
#ifndef ISC_OFFSET_H #ifndef ISC_OFFSET_H
#define ISC_OFFSET_H 1 #define ISC_OFFSET_H 1
@@ -31,7 +31,9 @@ typedef off_t isc_offset_t;
/* /*
* POSIX says "Additionally, blkcnt_t and off_t are extended signed integral * 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. * 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.
*/ */
#define ISC_OFFSET_MAXIMUM (~((off_t)1 << (sizeof(off_t) * CHAR_BIT - 1))) #define ISC_OFFSET_MAXIMUM ((off_t)~(1ULL << (sizeof(off_t) * CHAR_BIT - 1)))
#endif /* ISC_OFFSET_H */ #endif /* ISC_OFFSET_H */