This manual page represents intent instead of actual practice.
While it is intended that
Fn atof
be implemented using
strtod(3),
this has not yet happened.
In the current system,
Fn atof
translates a string in the following form to a double: a string of
leading white space, possibly followed by a sign (``+'' or ``-''),
followed by a digit string which may contain one decimal point (``.''),
which may be followed by either of the exponent flags (``E'' or ``e''),
and lastly, followed by a signed or unsigned integer.