diff options
Diffstat (limited to 'src/include/utils/varbit.h')
| -rw-r--r-- | src/include/utils/varbit.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/include/utils/varbit.h b/src/include/utils/varbit.h index e329d52e247..58727c66b9a 100644 --- a/src/include/utils/varbit.h +++ b/src/include/utils/varbit.h @@ -15,6 +15,8 @@ #ifndef VARBIT_H #define VARBIT_H +#include <limits.h> + #include "fmgr.h" /* @@ -53,6 +55,11 @@ typedef struct /* Number of bytes needed to store a bit string of a given length */ #define VARBITTOTALLEN(BITLEN) (((BITLEN) + BITS_PER_BYTE-1)/BITS_PER_BYTE + \ VARHDRSZ + VARBITHDRSZ) +/* + * Maximum number of bits. Several code sites assume no overflow from + * computing bitlen + X; VARBITTOTALLEN() has the largest such X. + */ +#define VARBITMAXLEN (INT_MAX - BITS_PER_BYTE + 1) /* pointer beyond the end of the bit string (like end() in STL containers) */ #define VARBITEND(PTR) (((bits8 *) (PTR)) + VARSIZE(PTR)) /* Mask that will cover exactly one byte, i.e. BITS_PER_BYTE bits */ |