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Accept and output '-Infinity' as well as 'Infinity', per long-ago

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suggestion from Ross Reedstrom.  Still needs work to make those symbols
convert to actual IEEE infinities (on machines where such things exist).
This commit is contained in:
Tom Lane 2001-06-02 20:18:30 +00:00
parent 1df27f9a59
commit 277a47ad0f
1 changed files with 22 additions and 5 deletions
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27
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 1.72 2001/06/02 17:12:12 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/float.c,v 1.73 2001/06/02 20:18:30 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -199,8 +199,15 @@ float4in(PG_FUNCTION_ARGS)
val = strtod(num, &endptr);
if (*endptr != '\0')
{
/* Shouldn't we accept "NaN" or "Infinity" for float4? */
elog(ERROR, "Bad float4 input format '%s'", num);
/*
* XXX we should accept "Infinity" and "-Infinity" too, but what
* are the correct values to assign? HUGE_VAL will provoke an
* error from CheckFloat4Val.
*/
if (strcasecmp(num, "NaN") == 0)
val = NAN;
else
elog(ERROR, "Bad float4 input format '%s'", num);
}
else
{
@ -226,11 +233,15 @@ float4out(PG_FUNCTION_ARGS)
{
float4 num = PG_GETARG_FLOAT4(0);
char *ascii = (char *) palloc(MAXFLOATWIDTH + 1);
int infflag;
if (isnan(num))
PG_RETURN_CSTRING(strcpy(ascii, "NaN"));
if (isinf(num))
infflag = isinf(num);
if (infflag > 0)
PG_RETURN_CSTRING(strcpy(ascii, "Infinity"));
if (infflag < 0)
PG_RETURN_CSTRING(strcpy(ascii, "-Infinity"));
sprintf(ascii, "%.*g", FLT_DIG, num);
PG_RETURN_CSTRING(ascii);
@ -258,6 +269,8 @@ float8in(PG_FUNCTION_ARGS)
val = NAN;
else if (strcasecmp(num, "Infinity") == 0)
val = HUGE_VAL;
else if (strcasecmp(num, "-Infinity") == 0)
val = -HUGE_VAL;
else
elog(ERROR, "Bad float8 input format '%s'", num);
}
@ -282,11 +295,15 @@ float8out(PG_FUNCTION_ARGS)
{
float8 num = PG_GETARG_FLOAT8(0);
char *ascii = (char *) palloc(MAXDOUBLEWIDTH + 1);
int infflag;
if (isnan(num))
PG_RETURN_CSTRING(strcpy(ascii, "NaN"));
if (isinf(num))
infflag = isinf(num);
if (infflag > 0)
PG_RETURN_CSTRING(strcpy(ascii, "Infinity"));
if (infflag < 0)
PG_RETURN_CSTRING(strcpy(ascii, "-Infinity"));
sprintf(ascii, "%.*g", DBL_DIG, num);
PG_RETURN_CSTRING(ascii);