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lwprint_double: Avoid undefined behaviour with infinity #200

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lwprint_double: Avoid undefined behaviour with infinity #200

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3 changes: 2 additions & 1 deletion liblwgeom/lwprint.c
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Expand Up @@ -488,7 +488,7 @@ int
lwprint_double(double d, int maxdd, char* buf, size_t bufsize)
{
double ad = fabs(d);
int ndd = ad < 1 ? 0 : floor(log10(ad)) + 1; /* non-decimal digits */
int ndd;
int length = 0;
if (ad <= FP_TOLERANCE)
{
Expand All @@ -497,6 +497,7 @@ lwprint_double(double d, int maxdd, char* buf, size_t bufsize)
}
if (ad < OUT_MAX_DOUBLE)
{
ndd = ad < 1 ? 0 : floor(log10(ad)) + 1; /* non-decimal digits */
if (maxdd > (OUT_MAX_DOUBLE_PRECISION - ndd)) maxdd -= ndd;
length = snprintf(buf, bufsize, "%.*f", maxdd, d);
}
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