Converts a string into a floating point number.
double ustrtod(const char *
s, char **
This function converts as many characters of `s' that look like a floating
point number into one, and sets `*endp' to point to the first unused
character, if `endp' is not a NULL pointer. Example:
char *endp, *string = "456.203 askdfg";
double number = ustrtod(string, &endp);
Returns the string converted as a value of type `double'. If nothing was
converted, returns zero with *endp pointing to the beginning of s.
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