The explain_strtod_or_die function is used to call the
strtod(3) system call. On failure an explanation will be printed to
stderr, obtained from the explain_strtod(3) function, and
then the process terminates by calling exit(EXIT_FAILURE).
The explain_strtod_on_error function is used to call the
strtod(3) system call. On failure an explanation will be printed to
stderr, obtained from the explain_strtod(3) function, but
still returns to the caller.
nptr
The nptr, exactly as to be passed to the strtod(3) system call.
endptr
The endptr, exactly as to be passed to the strtod(3) system call.
RETURN VALUE
The explain_strtod_or_die function only returns on success, see
strtod(3) for more information. On failure, prints an explanation
and exits, it does not return.
The explain_strtod_on_error function always returns the value
return by the wrapped strtod(3) system call.
EXAMPLE
The explain_strtod_or_die function is intended to be used in a
fashion similar to the following example:
double result = explain_strtod_or_die(nptr, endptr);