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Fix corner case bug in numeric to_char().

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Trailing-zero stripping applied by the FM specifier could strip zeroes
to the left of the decimal point, for a format with no digit positions
after the decimal point (such as "FM999.").

Reported and diagnosed by Marti Raudsepp, though I didn't use his patch.
This commit is contained in:
Tom Lane
2011-09-07 17:06:10 -04:00
parent 7b8e10f2be
commit f0bedf3e45
3 changed files with 42 additions and 7 deletions
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27
src/backend/utils/adt/formatting.c
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@ -3908,6 +3908,9 @@ NUM_prepare_locale(NUMProc *Np)
/* ----------
* Return pointer of last relevant number after decimal point
* 12.0500 --> last relevant is '5'
* 12.0000 --> last relevant is '.'
* If there is no decimal point, return NULL (which will result in same
* behavior as if FM hadn't been specified).
* ----------
*/
static char *
@ -3921,7 +3924,8 @@ get_last_relevant_decnum(char *num)
#endif
if (!p)
p = num;
return NULL;
result = p;
while (*(++p))
@ -4458,13 +4462,22 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
{
Np->num_pre = plen;
if (IS_FILLMODE(Np->Num))
if (IS_FILLMODE(Np->Num) && IS_DECIMAL(Np->Num))
{
if (IS_DECIMAL(Np->Num))
Np->last_relevant = get_last_relevant_decnum(
Np->number +
((Np->Num->zero_end - Np->num_pre > 0) ?
Np->Num->zero_end - Np->num_pre : 0));
Np->last_relevant = get_last_relevant_decnum(Np->number);
/*
* If any '0' specifiers are present, make sure we don't strip
* those digits.
*/
if (Np->last_relevant && Np->Num->zero_end > Np->num_pre)
{
char *last_zero;
last_zero = Np->number + (Np->Num->zero_end - Np->num_pre);
if (Np->last_relevant < last_zero)
Np->last_relevant = last_zero;
}
}
if (Np->sign_wrote == FALSE && Np->num_pre == 0)