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Add extra_float_digits GUC parameter to allow adjustment of displayed

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precision for float4, float8, and geometric types.  Set it in pg_dump
so that float data can be dumped/reloaded exactly (at least on platforms
where the float I/O support is properly implemented).  Initial patch by
Pedro Ferreira, some additional work by Tom Lane.
This commit is contained in:
Tom Lane
2002-11-08 17:37:52 +00:00
parent fef731d1c4
commit d2c744aa56
8 changed files with 107 additions and 39 deletions
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31
src/backend/utils/adt/float.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/float.c,v 1.82 2002/10/19 02:08:17 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/float.c,v 1.83 2002/11/08 17:37:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -94,9 +94,6 @@ extern double rint(double x);
#endif /* NeXT check */
static void CheckFloat4Val(double val);
static void CheckFloat8Val(double val);
#ifndef M_PI
/* from my RH5.2 gcc math.h file - thomas 2000-04-03 */
#define M_PI 3.14159265358979323846
@ -113,8 +110,6 @@ static void CheckFloat8Val(double val);
#define SHRT_MIN (-32768)
#endif
#define FORMAT 'g' /* use "g" output format as standard
* format */
/* not sure what the following should be, but better to make it over-sufficient */
#define MAXFLOATWIDTH 64
#define MAXDOUBLEWIDTH 128
@ -128,6 +123,14 @@ static void CheckFloat8Val(double val);
#define FLOAT8_MIN DBL_MIN
/* Configurable GUC parameter */
int extra_float_digits = 0; /* Added to DBL_DIG or FLT_DIG */
static void CheckFloat4Val(double val);
static void CheckFloat8Val(double val);
/*
* check to see if a float4 val is outside of
* the FLOAT4_MIN, FLOAT4_MAX bounds.
@ -228,6 +231,7 @@ float4out(PG_FUNCTION_ARGS)
float4 num = PG_GETARG_FLOAT4(0);
char *ascii = (char *) palloc(MAXFLOATWIDTH + 1);
int infflag;
int ndig;
if (isnan(num))
PG_RETURN_CSTRING(strcpy(ascii, "NaN"));
@ -237,7 +241,12 @@ float4out(PG_FUNCTION_ARGS)
if (infflag < 0)
PG_RETURN_CSTRING(strcpy(ascii, "-Infinity"));
sprintf(ascii, "%.*g", FLT_DIG, num);
ndig = FLT_DIG + extra_float_digits;
if (ndig < 1)
ndig = 1;
sprintf(ascii, "%.*g", ndig, num);
PG_RETURN_CSTRING(ascii);
}
@ -290,6 +299,7 @@ float8out(PG_FUNCTION_ARGS)
float8 num = PG_GETARG_FLOAT8(0);
char *ascii = (char *) palloc(MAXDOUBLEWIDTH + 1);
int infflag;
int ndig;
if (isnan(num))
PG_RETURN_CSTRING(strcpy(ascii, "NaN"));
@ -299,7 +309,12 @@ float8out(PG_FUNCTION_ARGS)
if (infflag < 0)
PG_RETURN_CSTRING(strcpy(ascii, "-Infinity"));
sprintf(ascii, "%.*g", DBL_DIG, num);
ndig = DBL_DIG + extra_float_digits;
if (ndig < 1)
ndig = 1;
sprintf(ascii, "%.*g", ndig, num);
PG_RETURN_CSTRING(ascii);
}