On Tue, Apr 07, 2009 at 12:51:21PM -0400, Tom Lane wrote:
> Sam Mason <s...@samason.me.uk> writes:
> > SELECT 'NaN'::float8;
> > SELECT ' NaN'::float8;
> > SELECT 'NaN '::float8;
> > SELECT '+NaN'::float8;
> > SELECT '-NaN'::float8;
>
> Well, the +- part must be an artifact of your strtod() implementation;
> our own code isn't doing anything to accept that. I think it's pretty
> bogus --- NaNs do not have signs.
OK, didn't actually check the code with that; no point worrying about it
then.
> IIRC, the explicit support for leading/trailing spaces is something that
> we added in float8in long after numeric_in was written, and I think just
> nobody thought about numeric at the time. But it's clearly inconsistent
> to allow spaces around a regular value but not a NaN.
Good, I wanted to make sure it wasn't a deliberate thing before doing
too much.
> Possibly the logic for leading/trailing spaces could be pulled out
> of set_var_from_str and executed in numeric_in instead?
Yes, I didn't want to do this before because it's called from a
couple of other places. I looked again and realised that we're
generating those in very fixed formats so don't need to worry about
leading/trailing spaces and hence can move the code up to numeric_in.
The attached patch gives set_var_from_str an "endptr" similar to strtod
so handling is closer to the float[48]in code. I moved error reporting
code outside as well to cut down on the multiple identical calls.
The included patch was generated against 8.3.5 (because that's what I
had lying around when I started playing) but applies with a little fuzz
to the latest snapshot and does the right thing for me in both versions.
--
Sam http://samason.me.uk/
*** src/backend/utils/adt/numeric.c 2009-04-07 16:49:08.000000000 +0100
--- src/backend/utils/adt/numeric.c 2009-04-08 11:53:13.000000000 +0100
***************
*** 238,244 ****
static void free_var(NumericVar *var);
static void zero_var(NumericVar *var);
! static void set_var_from_str(const char *str, NumericVar *dest);
static void set_var_from_num(Numeric value, NumericVar *dest);
static void set_var_from_var(NumericVar *value, NumericVar *dest);
static char *get_str_from_var(NumericVar *var, int dscale);
--- 238,244 ----
static void free_var(NumericVar *var);
static void zero_var(NumericVar *var);
! static void set_var_from_str(const char *str, const char ** endptr, NumericVar *dest);
static void set_var_from_num(Numeric value, NumericVar *dest);
static void set_var_from_var(NumericVar *value, NumericVar *dest);
static char *get_str_from_var(NumericVar *var, int dscale);
***************
*** 310,315 ****
--- 310,317 ----
numeric_in(PG_FUNCTION_ARGS)
{
char *str = PG_GETARG_CSTRING(0);
+ char *orig_str;
+ const char *endptr;
#ifdef NOT_USED
Oid typelem = PG_GETARG_OID(1);
***************
*** 318,335 ****
NumericVar value;
Numeric res;
! /*
! * Check for NaN
*/
! if (pg_strcasecmp(str, "NaN") == 0)
! PG_RETURN_NUMERIC(make_result(&const_nan));
/*
* Use set_var_from_str() to parse the input string and return it in the
* packed DB storage format
*/
init_var(&value);
! set_var_from_str(str, &value);
apply_typmod(&value, typmod);
--- 320,369 ----
NumericVar value;
Numeric res;
! /*
! * To allow us to generate sensible error messages we tuck the
! * original start of the string away so we can use it later.
*/
! orig_str = str;
!
! /* skip leading spaces */
! while (isspace((unsigned char) *str))
! str++;
/*
* Use set_var_from_str() to parse the input string and return it in the
* packed DB storage format
*/
init_var(&value);
! set_var_from_str(str, &endptr, &value);
!
! /*
! * we didn't see anything that looked like a numeric value
! */
! if (str == endptr) {
! /*
! * Check for NaN
! */
! if (pg_strncasecmp(str, "NaN", 3) == 0) {
! value = const_nan;
! endptr = str + 3;
! } else
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"",
! orig_str)));
! }
!
! /* skip trailing spaces */
! while (isspace((unsigned char) *endptr))
! endptr++;
!
! if (*endptr != '\0') {
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"",
! orig_str)));
! }
apply_typmod(&value, typmod);
***************
*** 2056,2061 ****
--- 2090,2096 ----
Numeric res;
NumericVar result;
char buf[DBL_DIG + 100];
+ const char *endptr;
if (isnan(val))
PG_RETURN_NUMERIC(make_result(&const_nan));
***************
*** 2064,2070 ****
init_var(&result);
! set_var_from_str(buf, &result);
res = make_result(&result);
free_var(&result);
--- 2099,2111 ----
init_var(&result);
! set_var_from_str(buf, &endptr, &result);
! if (endptr == buf) {
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"",
! buf)));
! }
res = make_result(&result);
free_var(&result);
***************
*** 2116,2121 ****
--- 2157,2163 ----
Numeric res;
NumericVar result;
char buf[FLT_DIG + 100];
+ const char *endptr;
if (isnan(val))
PG_RETURN_NUMERIC(make_result(&const_nan));
***************
*** 2124,2130 ****
init_var(&result);
! set_var_from_str(buf, &result);
res = make_result(&result);
free_var(&result);
--- 2166,2178 ----
init_var(&result);
! set_var_from_str(buf, &endptr, &result);
! if (endptr == buf) {
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"",
! buf)));
! }
res = make_result(&result);
free_var(&result);
***************
*** 2901,2907 ****
* Parse a string and put the number into a variable
*/
static void
! set_var_from_str(const char *str, NumericVar *dest)
{
const char *cp = str;
bool have_dp = FALSE;
--- 2949,2955 ----
* Parse a string and put the number into a variable
*/
static void
! set_var_from_str(const char *str, const char **endptr, NumericVar *dest)
{
const char *cp = str;
bool have_dp = FALSE;
***************
*** 2916,2934 ****
int offset;
NumericDigit *digits;
/*
* We first parse the string to extract decimal digits and determine the
* correct decimal weight. Then convert to NBASE representation.
*/
- /* skip leading spaces */
- while (*cp)
- {
- if (!isspace((unsigned char) *cp))
- break;
- cp++;
- }
-
switch (*cp)
{
case '+':
--- 2964,2977 ----
int offset;
NumericDigit *digits;
+ /* record where we started so calling code can generate errors appropriately */
+ *endptr = str;
+
/*
* We first parse the string to extract decimal digits and determine the
* correct decimal weight. Then convert to NBASE representation.
*/
switch (*cp)
{
case '+':
***************
*** 2949,2957 ****
}
if (!isdigit((unsigned char) *cp))
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"", str)));
decdigits = (unsigned char *) palloc(strlen(cp) + DEC_DIGITS * 2);
--- 2992,2998 ----
}
if (!isdigit((unsigned char) *cp))
! return;
decdigits = (unsigned char *) palloc(strlen(cp) + DEC_DIGITS * 2);
***************
*** 2972,2981 ****
else if (*cp == '.')
{
if (have_dp)
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"",
! str)));
have_dp = TRUE;
cp++;
}
--- 3013,3019 ----
else if (*cp == '.')
{
if (have_dp)
! return;
have_dp = TRUE;
cp++;
}
***************
*** 2996,3028 ****
cp++;
exponent = strtol(cp, &endptr, 10);
if (endptr == cp)
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"",
! str)));
cp = endptr;
if (exponent > NUMERIC_MAX_PRECISION ||
exponent < -NUMERIC_MAX_PRECISION)
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"",
! str)));
dweight += (int) exponent;
dscale -= (int) exponent;
if (dscale < 0)
dscale = 0;
}
! /* Should be nothing left but spaces */
! while (*cp)
! {
! if (!isspace((unsigned char) *cp))
! ereport(ERROR,
! (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
! errmsg("invalid input syntax for type numeric: \"%s\"",
! str)));
! cp++;
! }
/*
* Okay, convert pure-decimal representation to base NBASE. First we need
--- 3034,3053 ----
cp++;
exponent = strtol(cp, &endptr, 10);
if (endptr == cp)
! return;
!
cp = endptr;
if (exponent > NUMERIC_MAX_PRECISION ||
exponent < -NUMERIC_MAX_PRECISION)
! return;
dweight += (int) exponent;
dscale -= (int) exponent;
if (dscale < 0)
dscale = 0;
}
! /* record where the end of the number was for the calling code */
! *endptr = cp;
/*
* Okay, convert pure-decimal representation to base NBASE. First we need
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
