78 lines
1.3 KiB
Rust
78 lines
1.3 KiB
Rust
//
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// sprocketnes/util.rs
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//
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// Author: Patrick Walton
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//
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use std::io::File;
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use std::libc::{c_int, c_void, time_t};
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use std::ptr::null;
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//
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// Random number generation
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//
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pub struct Xorshift {
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x: u32,
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y: u32,
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z: u32,
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w: u32,
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}
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impl Xorshift {
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pub fn new() -> Xorshift {
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Xorshift { x: 123456789, y: 362436069, z: 521288629, w: 88675123 }
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}
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pub fn next(&mut self) -> u32 {
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let t = self.x ^ (self.x << 11);
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self.x = self.y; self.y = self.z; self.z = self.w;
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self.w = self.w ^ (self.w >> 19) ^ (t ^ (t >> 8));
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self.w
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}
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}
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//
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// Simple assertions
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//
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#[cfg(debug)]
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pub fn debug_assert(cond: bool, msg: &str) {
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if !cond {
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println(msg);
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}
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}
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#[cfg(not(debug))]
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pub fn debug_assert(_: bool, _: &str) {}
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#[cfg(debug)]
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pub fn debug_print(msg: &str) {
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println(msg);
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}
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#[cfg(not(debug))]
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pub fn debug_print(_: &str) {}
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//
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// Bindings for `gettimeofday(2)`
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//
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struct timeval {
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tv_sec: time_t,
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tv_usec: u32,
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}
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extern {
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fn gettimeofday(tp: *mut timeval, tzp: *c_void) -> c_int;
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}
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pub fn current_time_millis() -> u64 {
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unsafe {
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let mut tv = timeval { tv_sec: 0, tv_usec: 0 };
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gettimeofday(&mut tv, null());
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(tv.tv_sec as u64) * 1000 + (tv.tv_usec as u64) / 1000
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}
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}
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