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ldtoa cuts the number of digits it returns based on a computation of number of supported bits (144) divide by log10(2). Not only is the integer approximation of log10(2) ~= 8/27 missing a digit here, it also fails to take really small double and long double values into account. Allow for the full potential precision of long double values. At the same time, change the local string array allocation to request only as much bytes as necessary to support the caller-requested number of digits, to keep the stack size low on small targets. In the long run a better fix would be to switch to gdtoa, as the BSD variants, as well as Mingw64 do. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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