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/*

FUNCTION

   <>, <>---string to double or float

INDEX

	atof

INDEX

	atoff

ANSI_SYNOPSIS

	#include 

        double atof(const char *<[s]>);

        float atoff(const char *<[s]>);

TRAD_SYNOPSIS

	#include 

        double atof(<[s]>)

        char *<[s]>;

        float atoff(<[s]>)

        char *<[s]>;

DESCRIPTION

<> converts the initial portion of a string to a <>.

<> converts the initial portion of a string to a <>.

The functions parse the character string <[s]>,

locating a substring which can be converted to a floating-point

value. The substring must match the format:

. [+|-]<[digits]>[.][<[digits]>][(e|E)[+|-]<[digits]>]

The substring converted is the longest initial

fragment of <[s]> that has the expected format, beginning with

the first non-whitespace character.  The substring

is empty if <> is empty, consists entirely

of whitespace, or if the first non-whitespace character is

something other than <<+>>, <<->>, <<.>>, or a digit.

<)>> is implemented as <, NULL)>>.

<)>> is implemented as <, NULL)>>.

RETURNS

<> returns the converted substring value, if any, as a

<>; or <<0.0>>,  if no conversion could be performed.

If the correct value is out of the range of representable values, plus

or minus <> is returned, and <> is stored in

<>.

If the correct value would cause underflow, <<0.0>> is returned

and <> is stored in <>.

<> obeys the same rules as <>, except that it

returns a <>.

PORTABILITY

<> is ANSI C. <>, <>, and <> are subsumed by <>

and <>, but are used extensively in existing code. These functions are

less reliable, but may be faster if the argument is verified to be in a valid

range.

Supporting OS subroutines required: <>, <>, <>,

<>, <>, <>, <>.

*/

#include 

#include <_ansi.h>

double

_DEFUN (atof, (s),

	_CONST char *s)

{

  return strtod (s, NULL);

}