c-scape 0.22.3

A libc bottom-half implementation in Rust
Documentation 
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//! Integer math.

use libc::{c_int, c_long, c_longlong, intmax_t};

#[no_mangle]
unsafe extern "C" fn ffs(i: c_int) -> c_int {
    //libc!(libc::ffs(i));

    if i == 0 {
        0
    } else {
        i.trailing_zeros() as c_int + 1
    }
}

#[no_mangle]
unsafe extern "C" fn ffsl(i: c_long) -> c_int {
    //libc!(libc::ffsl(i));

    if i == 0 {
        0
    } else {
        i.trailing_zeros() as c_int + 1
    }
}

#[no_mangle]
unsafe extern "C" fn ffsll(i: c_longlong) -> c_int {
    //libc!(libc::ffsll(i));

    if i == 0 {
        0
    } else {
        i.trailing_zeros() as c_int + 1
    }
}

#[no_mangle]
unsafe extern "C" fn abs(i: c_int) -> c_int {
    libc!(libc::abs(i));

    i.abs()
}

#[no_mangle]
unsafe extern "C" fn labs(i: c_long) -> c_long {
    libc!(libc::labs(i));

    i.abs()
}

#[no_mangle]
unsafe extern "C" fn llabs(i: c_longlong) -> c_longlong {
    //libc!(libc::llabs(i));

    i.abs()
}

#[no_mangle]
unsafe extern "C" fn imaxabs(i: intmax_t) -> intmax_t {
    //libc!(libc::imaxabs(i));

    i.abs()
}

// The libc crate doesn't currently have `div_t` etc., so define them here.
#[repr(C)]
struct div_t {
    quot: c_int,
    rem: c_int,
}

#[repr(C)]
struct ldiv_t {
    quot: c_long,
    rem: c_long,
}

#[repr(C)]
struct lldiv_t {
    quot: c_longlong,
    rem: c_longlong,
}

#[no_mangle]
unsafe extern "C" fn div(numerator: c_int, denominator: c_int) -> div_t {
    //libc!(libc::div(numerator, denominator));

    div_t {
        quot: numerator / denominator,
        rem: numerator % denominator,
    }
}

#[no_mangle]
unsafe extern "C" fn ldiv(numerator: c_long, denominator: c_long) -> ldiv_t {
    //libc!(libc::ldiv(numerator, denominator));

    ldiv_t {
        quot: numerator / denominator,
        rem: numerator % denominator,
    }
}

#[no_mangle]
unsafe extern "C" fn lldiv(numerator: c_longlong, denominator: c_longlong) -> lldiv_t {
    //libc!(libc::lldiv(numerator, denominator));

    lldiv_t {
        quot: numerator / denominator,
        rem: numerator % denominator,
    }
}

#[no_mangle]
unsafe extern "C" fn __ffsdi2(i: c_long) -> c_int {
    //libc!(libc::__ffsdi2(i));

    ffsl(i)
}

#[no_mangle]
unsafe extern "C" fn __clzdi2(i: c_long) -> c_int {
    //libc!(libc::__clzdi2(i));

    i.leading_zeros() as c_int
}

#[no_mangle]
unsafe extern "C" fn __ctzdi2(i: c_long) -> c_int {
    //libc!(libc::__ctzdi2(i));

    i.trailing_zeros() as c_int
}

#[no_mangle]
unsafe extern "C" fn __popcountdi2(i: c_long) -> c_int {
    //libc!(libc::__popcountdi2(i));

    i.count_ones() as c_int
}