Function creachadair_imath_sys::mp_rat_read_ustring

pub unsafe extern "C" fn mp_rat_read_ustring(
    r: mp_rat,
    radix: mp_size,
    str_: *const c_char,
    end: *mut *mut c_char
) -> mp_result

Sets r to the value represented by a zero-terminated string str having one of the following formats, each with an optional leading sign flag:

n : integer format, e.g. “123” n/d : ratio format, e.g., “-12/5” z.ffff : decimal format, e.g., “1.627”

It returns MP_UNDEF if the effective denominator is zero. If end is not NULL then *end is set to point to the first unconsumed character in the string, after parsing.