[issue9009] Improve quality of Python/dtoa.c

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

A couple of preparatory commits:

r82025: In _Py_dg_strtod, 'e' now represents the adjusted exponent rather than the base exponent;  that is, the input value is of the form +- m * 10**e with 0.1 <= m < 1.0.  It's easier to produce such an 'e' from the parsing stage if we care about detecting overflow and underflow.

r82031: Update the s2b function:  remove a premature optimization in order to make s2b more general and its correctness more easily verifiable; alter the way that the input string is parsed so that it doesn't depend on nd0 being in the range [0, nd].

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<http://bugs.python.org/issue9009>
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