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Make details of the Numeric representation private to numeric.c.

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Review by Tom Lane.
This commit is contained in:
Robert Haas
2010-07-30 04:30:23 +00:00
parent f223bb7a41
commit 8a4dc94ca0
4 changed files with 75 additions and 50 deletions
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42
src/include/utils/numeric.h
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@ -7,7 +7,7 @@
*
* Copyright (c) 1998-2010, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/utils/numeric.h,v 1.29 2010/01/02 16:58:10 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/numeric.h,v 1.30 2010/07/30 04:30:23 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@ -37,41 +37,9 @@
*/
#define NUMERIC_MIN_SIG_DIGITS 16
/*
* Sign values and macros to deal with packing/unpacking n_sign_dscale
*/
#define NUMERIC_SIGN_MASK 0xC000
#define NUMERIC_POS 0x0000
#define NUMERIC_NEG 0x4000
#define NUMERIC_NAN 0xC000
#define NUMERIC_DSCALE_MASK 0x3FFF
#define NUMERIC_SIGN(n) ((n)->n_sign_dscale & NUMERIC_SIGN_MASK)
#define NUMERIC_DSCALE(n) ((n)->n_sign_dscale & NUMERIC_DSCALE_MASK)
#define NUMERIC_IS_NAN(n) (NUMERIC_SIGN(n) != NUMERIC_POS && \
NUMERIC_SIGN(n) != NUMERIC_NEG)
/*
* The Numeric data type stored in the database
*
* NOTE: by convention, values in the packed form have been stripped of
* all leading and trailing zero digits (where a "digit" is of base NBASE).
* In particular, if the value is zero, there will be no digits at all!
* The weight is arbitrary in that case, but we normally set it to zero.
*/
typedef struct NumericData
{
int32 vl_len_; /* varlena header (do not touch directly!) */
uint16 n_sign_dscale; /* Sign + display scale */
int16 n_weight; /* Weight of 1st digit */
char n_data[1]; /* Digits (really array of NumericDigit) */
} NumericData;
typedef NumericData *Numeric;
#define NUMERIC_HDRSZ (VARHDRSZ + sizeof(uint16) + sizeof(int16))
/* The actual contents of Numeric are private to numeric.c */
struct NumericData;
typedef struct NumericData *Numeric;
/*
* fmgr interface macros
@ -87,6 +55,8 @@ typedef NumericData *Numeric;
/*
* Utility functions in numeric.c
*/
extern bool numeric_is_nan(Numeric num);
int32 numeric_maximum_size(int32 typemod);
extern char *numeric_out_sci(Numeric num, int scale);
#endif /* _PG_NUMERIC_H_ */