Function strtod2::strtod

pub fn strtod(input: &str) -> Option<f64>

Parses a 64-bit floating point number.

Leading whitspace and trailing characters are ignored. If the input string does not contain a valid floating point number (where e.g. "." is seen as a valid floating point number), None is returned. Otherwise the parsed floating point number is returned.

This implementation is a translation from http://mxr.mozilla.org/mozilla-central/source/js/src/dtoa.c.