Yo Mark! On Wed, 13 Sep 2017 22:31:31 +0000 Mark Atwood via devel <devel@ntpsec.org> wrote:
> How much complexity would it add to add the missing fp functions in
> the same way the strlcpy function is?
I think all we need for NetBSD 6.1 is ldexpl().
Here is one way, a very slow way, to do it:
long double ldexpl(long double value, int e)
{
if (value == 0 || value == INFINITY || value == -INFINITY || value != value)
{
// Return +0.0/-0.0, +INF/-INF and NaN as-is
}
else
{
while (e > 0)
value = value * 2, e--;
while (e < 0)
value = value * 0.5f, e++; // won't round denormals correctly
}
return value;
}
Ripped from:
https://github.com/alexfru/SmallerC/blob/master/v0100/srclib/ldexp.c
NTPsec only uses 32 and -32 values for 'e', so some simplification
possible.
The INF tests should likely be replaced with isfinite().
RGDS
GARY
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