rust/src/lib/_uint.rs

import std.sys;

fn add(uint x, uint y) -> uint { ret x + y; }
fn sub(uint x, uint y) -> uint { ret x - y; }
fn mul(uint x, uint y) -> uint { ret x * y; }
fn div(uint x, uint y) -> uint { ret x / y; }
fn rem(uint x, uint y) -> uint { ret x % y; }

fn lt(uint x, uint y) -> bool { ret x < y; }
fn le(uint x, uint y) -> bool { ret x <= y; }
fn eq(uint x, uint y) -> bool { ret x == y; }
fn ne(uint x, uint y) -> bool { ret x != y; }
fn ge(uint x, uint y) -> bool { ret x >= y; }
fn gt(uint x, uint y) -> bool { ret x > y; }

iter range(mutable uint lo, uint hi) -> uint {
    while (lo < hi) {
        put lo;
        lo += 1u;
    }
}

fn next_power_of_two(uint n) -> uint {
    // FIXME change |* uint(4)| below to |* uint(8) / uint(2)| and watch the
    // world explode.
    let uint halfbits = sys.rustrt.size_of[uint]() * 4u;
    let uint tmp = n - 1u;
    let uint shift = 1u;
    while (shift <= halfbits) {
        tmp |= tmp >> shift;
        shift <<= 1u;
    }
    ret tmp + 1u;
}

fn to_str(mutable uint n, uint radix) -> str
{
    check (0u < radix && radix <= 16u);
    fn digit(uint n) -> char {
        alt (n) {
            case (0u) { ret '0'; }
            case (1u) { ret '1'; }
            case (2u) { ret '2'; }
            case (3u) { ret '3'; }
            case (4u) { ret '4'; }
            case (5u) { ret '5'; }
            case (6u) { ret '6'; }
            case (7u) { ret '7'; }
            case (8u) { ret '8'; }
            case (9u) { ret '9'; }
            case (10u) { ret 'a'; }
            case (11u) { ret 'b'; }
            case (12u) { ret 'c'; }
            case (13u) { ret 'd'; }
            case (14u) { ret 'e'; }
            case (15u) { ret 'f'; }
        }
    }

    if (n == 0u) { ret "0"; }

    let uint r = 1u;
    if (n > r) {
        while ((r*radix) <= n) {
            r *= radix;
        }
    }

    let str s = "";
    while (n > 0u) {

        auto i = n/r;

        n -= (i * r);
        r /= radix;

        s += digit(i) as u8;
    }

    while (r > 0u) {
        s += '0' as u8;
        r /= radix;
    }

    ret s;
}

// Local Variables:
// mode: rust;
// fill-column: 78;
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// compile-command: "make -k -C .. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
// End: