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Clean up problems with rounding/overflow code in NUMERIC, particularly

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the case wherein zero was rejected for a field like NUMERIC(4,4).
Miscellaneous other code beautification efforts.
This commit is contained in:
Tom Lane
2000-01-15 23:42:49 +00:00
parent 584e646ad8
commit 3cb8c8da68
2 changed files with 131 additions and 87 deletions
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24
src/include/utils/numeric.h
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@ -5,7 +5,7 @@
*
* 1998 Jan Wieck
*
* $Header: /cvsroot/pgsql/src/include/utils/numeric.h,v 1.7 1999/07/14 01:20:30 momjian Exp $
* $Header: /cvsroot/pgsql/src/include/utils/numeric.h,v 1.8 2000/01/15 23:42:48 tgl Exp $
*
* ----------
*/
@ -21,31 +21,41 @@
#define NUMERIC_DEFAULT_PRECISION 30
#define NUMERIC_DEFAULT_SCALE 6
/* ----------
* Internal limits on the scales chosen for calculation results
* ----------
*/
#define NUMERIC_MAX_DISPLAY_SCALE NUMERIC_MAX_PRECISION
#define NUMERIC_MIN_DISPLAY_SCALE NUMERIC_DEFAULT_SCALE + 4
#define NUMERIC_MIN_DISPLAY_SCALE (NUMERIC_DEFAULT_SCALE + 4)
#define NUMERIC_MAX_RESULT_SCALE (NUMERIC_MAX_PRECISION * 2)
#define NUMERIC_MIN_RESULT_SCALE (NUMERIC_DEFAULT_PRECISION + 4)
#define NUMERIC_UNPACKED_DATASIZE (NUMERIC_MAX_PRECISION * 2 + 4)
/* ----------
* Sign values and macros to deal with n_sign_dscale
* 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_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 zeroes (except there will be a trailing zero
* in the last byte, if the number of digits is odd). In particular,
* if the value is zero, there will be no digits at all! The weight is
* arbitrary in this case, but we normally set it to zero.
* ----------
*/
typedef struct NumericData
@ -54,7 +64,7 @@ typedef struct NumericData
int16 n_weight; /* Weight of 1st digit */
uint16 n_rscale; /* Result scale */
uint16 n_sign_dscale; /* Sign + display scale */
unsigned char n_data[1]; /* Digit data */
unsigned char n_data[1]; /* Digit data (2 decimal digits/byte) */
} NumericData;
typedef NumericData *Numeric;