重写部分core crate

src/kernel/clock/time.rs

@@ -11,6 +11,7 @@ extern "C" {
 pub struct SystemTimeError(Duration);
 
 #[derive(Clone, Copy, Hash)]
+#[derive(Default)]
 pub struct SystemTime {
     unix_time: usize,
     ns_time: usize,

src/kernel/klog.rs

@@ -1,5 +1,4 @@
-use alloc::vec;
+use crate::libk::alloc::vec::Vec;
-use alloc::vec::Vec;
 
 use super::{
     clock::time::SystemTime,
@@ -28,12 +27,12 @@ pub struct KernelLogger {
 impl KernelLogger {
     pub fn new() -> Self {
         Self {
-            fatal_queue: vec![],
+            fatal_queue: Vec::new(),
-            error_queue: vec![],
+            error_queue: Vec::new(),
-            warning_queue: vec![],
+            warning_queue: Vec::new(),
-            info_queue: vec![],
+            info_queue: Vec::new(),
-            debug_queue: vec![],
+            debug_queue: Vec::new(),
-            trace_queue: vec![],
+            trace_queue: Vec::new(),
         }
     }
 
@@ -91,105 +90,18 @@ impl KernelLogger {
         self.trace_queue.push((SystemTime::now(), msg));
     }
 
-    pub fn iter(&self, level: LoggerLevel) -> LogIterator {
+    pub fn iter(&self, _level: LoggerLevel) -> LogIterator {
-        let mut logs = vec![];
+        todo!()
-        match level {
-            LoggerLevel::Fatal => {
-                logs.push(&self.fatal_queue);
-            }
-            LoggerLevel::Error => {
-                logs.push(&self.fatal_queue);
-                logs.push(&self.error_queue);
-            }
-            LoggerLevel::Warning => {
-                logs.push(&self.fatal_queue);
-                logs.push(&self.error_queue);
-                logs.push(&self.warning_queue);
-            }
-            LoggerLevel::Info => {
-                logs.push(&self.fatal_queue);
-                logs.push(&self.error_queue);
-                logs.push(&self.warning_queue);
-                logs.push(&self.info_queue);
-            }
-            LoggerLevel::Debug => {
-                logs.push(&self.fatal_queue);
-                logs.push(&self.error_queue);
-                logs.push(&self.warning_queue);
-                logs.push(&self.info_queue);
-                logs.push(&self.debug_queue);
-            }
-            LoggerLevel::Trace => {
-                logs.push(&self.fatal_queue);
-                logs.push(&self.error_queue);
-                logs.push(&self.warning_queue);
-                logs.push(&self.info_queue);
-                logs.push(&self.debug_queue);
-                logs.push(&self.trace_queue);
-            }
-        }
-        let mut res = vec![];
-        let mut indeces = Vec::new();
-        for _ in 0..logs.len() {
-            indeces.push(0usize);
-        }
-        let all_end = |indeces: &Vec<usize>, logs: &Vec<&Vec<(SystemTime, Message)>>| {
-            for i in 0..indeces.len() {
-                if indeces[i] < logs.len() {
-                    return false;
-                }
-            }
-            true
-        };
-        while !all_end(&indeces, &logs) {
-            let mut min_ind = None;
-            let mut min = None;
-            for i in 0..indeces.len() {
-                if indeces[i] >= logs[i].len() {
-                    continue;
-                }
-                if let Some(minx) = min.as_mut() {
-                    if logs[i][indeces[i]].0 < *minx {
-                        *minx = logs[i][indeces[i]].0;
-                        min_ind = Some(i);
-                    }
-                } else {
-                    min = Some(logs[i][indeces[i]].0);
-                    min_ind = Some(i);
-                }
-            }
-            if let Some(mini) = min_ind {
-                res.push(&logs[mini][indeces[mini]]);
-                indeces[mini] += 1;
-            } else {
-                break;
-            }
-        }
-        LogIterator { logs: res }
     }
 }
 
-pub struct LogIterator<'a> {
+pub struct LogIterator {
-    logs: Vec<&'a (SystemTime, Message)>,
 }
 
-impl<'a> Iterator for LogIterator<'a> {
+impl Iterator for LogIterator {
     type Item = Message;
 
     fn next(&mut self) -> Option<Self::Item> {
-        let res = if let Some((time, msg)) = self.logs.first() {
+        todo!()
-            Some(
-                MessageBuilder::new()
-                    .message(time)
-                    .append(MessageBuilder::from_message(msg.clone()))
-                    .build(),
-            )
-        } else {
-            None
-        };
-        if let Some(_) = res {
-            self.logs.remove(0);
-        }
-        res
     }
 }

src/kernel/sync/mod.rs

@@ -1 +0,0 @@
-pub mod rwlock;

src/kernel/sync/rwlock.rs

@@ -1,129 +0,0 @@
-use core::{ops::{Deref, DerefMut}, ptr::null_mut};
-
-use alloc::{vec, vec::Vec};
-
-/// ## RwLock<T>
-/// 读写锁
-///
-/// * 对于写入操作：
-///
-/// 锁没有占用时，获取锁，并执行闭包。
-///
-/// 当锁已经被占用，将闭包悬挂。
-///
-/// 释放锁时，将所有悬挂的闭包都执行。
-///
-/// 正在释放锁时，`write`方法返回`Err(())`
-///
-/// ```
-/// let num = 6;
-/// let num = RwLock::new(num);
-/// if let Err(()) = num.write(
-///     |n| *n = 10
-/// ) {}
-/// let numstr = format!("{}", num.read());
-/// ````
-pub struct RwLock<'a, T> {
-    obj: T,
-    locked: bool,
-    dealing_hanged: bool,
-    ptr: *mut RwLockWriteGuard<'a, T>,
-    hanging: Vec<&'a dyn Fn(&mut T)>,
-}
-
-unsafe impl<T> Send for RwLock<'_, T> {}
-unsafe impl<T> Sync for RwLock<'_, T> {}
-
-impl<'a, T> RwLock<'a, T> {
-    pub fn new(obj: T) -> Self {
-        Self {
-            obj,
-            locked: false,
-            dealing_hanged: false,
-            ptr: null_mut(),
-            hanging: vec![],
-        }
-    }
-
-    pub fn read(&self) -> RwLockReadGuard<T> {
-        RwLockReadGuard { obj: &self.obj }
-    }
-
-    pub fn write(&'a mut self, f: &'a dyn Fn(&mut T)) -> Result<RwLockWriteGuard<T>, ()> {
-        if self.dealing_hanged {
-            Err(())
-        } else if !self.locked {
-            self.locked = true;
-            f(&mut self.obj);
-            let ptr = { self as *mut RwLock<'a, T> };
-            let obj = &mut self.obj;
-            let mut res = RwLockWriteGuard {
-                obj,
-                ptr,
-                must_deal_hang: false,
-            };
-            self.ptr = &mut res as *mut RwLockWriteGuard<'_, T>;
-            Ok(res)
-        } else {
-            self.hanging.push(f);
-            let ptr = { self as *mut RwLock<'a, T> };
-            let obj = &mut self.obj;
-            Ok(RwLockWriteGuard {
-                obj,
-                ptr,
-                must_deal_hang: false,
-            })
-        }
-    }
-}
-
-pub struct RwLockReadGuard<'a, T> {
-    obj: &'a T,
-}
-
-impl<'a, T> Deref for RwLockReadGuard<'a, T> {
-    type Target = T;
-
-    fn deref(&self) -> &Self::Target {
-        self.obj
-    }
-}
-
-impl<'a, T> Drop for RwLockReadGuard<'a, T> {
-    fn drop(&mut self) {}
-}
-
-pub struct RwLockWriteGuard<'a, T> {
-    obj: &'a mut T,
-    ptr: *mut RwLock<'a, T>,
-    must_deal_hang: bool,
-}
-
-impl<'a, T> Deref for RwLockWriteGuard<'a, T> {
-    type Target = T;
-
-    fn deref(&self) -> &Self::Target {
-        self.obj
-    }
-}
-
-impl<'a, T> DerefMut for RwLockWriteGuard<'a, T> {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        self.obj
-    }
-}
-
-impl<'a, T> Drop for RwLockWriteGuard<'a, T> {
-    fn drop(&mut self) {
-        if self.must_deal_hang {
-            let p = unsafe { &mut *self.ptr };
-            p.dealing_hanged = true;
-            for f in p.hanging.iter() {
-                f(self.obj);
-            }
-            p.hanging.clear();
-            p.dealing_hanged = false;
-            p.locked = false;
-        }
-    }
-}

src/kernel/tty/tty.rs

@@ -1,8 +1,8 @@
 use core::ptr::null_mut;
 
-use alloc::{
+use crate::libk::alloc::{
+    boxed::Box,
     string::{String, ToString},
-    vec,
     vec::Vec,
 };
 
@@ -141,7 +141,7 @@ impl Tty {
     }
 }
 
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Default)]
 pub struct Color(pub u8, pub u8, pub u8);
 
 impl Color {
@@ -169,7 +169,7 @@ pub struct Resolution {
     pub height: usize,
 }
 
-#[derive(Clone)]
+#[derive(Clone, Default)]
 pub struct MessageSection {
     msg: String,
     fgcolor: Color,
@@ -179,14 +179,14 @@ pub struct MessageSection {
 /// ## Message
 ///
 /// 用`MessageBuilder`构造一个`Message`对象
-#[derive(Clone)]
+#[derive(Clone, Default)]
 pub struct Message(Vec<MessageSection>);
 
 impl ToString for Message {
     fn to_string(&self) -> String {
         let mut res = String::new();
         for MessageSection { msg, .. } in self.0.iter() {
-            res += msg;
+            res += msg.clone();
         }
         res
     }
@@ -212,7 +212,7 @@ impl ToString for Message {
 /// ```rust
 /// use crate::kernel::tty::tty::BuilderFunctions::*;
 ///
-/// message!(
+/// message_raw!(
 ///     Msg("Hello, "),
 ///     Msg("Metaverse"),
 ///     FgColor(Color::GREEN),
@@ -242,10 +242,14 @@ pub enum BuilderFunctions<'a> {
 impl MessageBuilder {
     pub fn new() -> Self {
         Self {
-            msg: Message(vec![]),
+            msg: Message(Vec::new()),
         }
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.msg.0.is_empty()
+    }
+
     pub fn from_message(msg: Message) -> Self {
         Self { msg }
     }
@@ -302,3 +306,82 @@ impl MessageBuilder {
         self.msg
     }
 }
+
+pub enum FmtMeta {
+    Color(Color),
+    String(String),
+    ToStringable(Box<dyn ToString>),
+    Hex(u8),
+    Pointer(usize),
+}
+
+pub fn format_message(fmt: &mut Vec<char>, meta: FmtMeta) -> MessageBuilder {
+    let mut msgbuilder = MessageBuilder::new();
+    let mut fmt_start = None;
+    let mut fmt_end = None;
+    for i in 0..fmt.len() {
+        if fmt[i] == '{' {
+            fmt_start = Some(i);
+        }
+        if fmt[i] == '}' {
+            fmt_end = Some(i);
+            break;
+        }
+    }
+    let tohex = |n: u8| {
+        if n < 10 {
+            (b'0' + n) as char
+        } else {
+            (b'a' + n - 10) as char
+        }
+    };
+    if fmt_start == None || fmt_end == None {
+        msgbuilder.message_mut(&String::from_iter(fmt.iter()));
+    } else {
+        let fmt_start = fmt_start.unwrap();
+        let fmt_end = fmt_end.unwrap();
+        let mut formatter = Vec::new();
+        for _ in fmt_start..=fmt_end {
+            formatter.push(fmt.remove(fmt_start));
+        }
+        formatter.remove(formatter.len() - 1);
+        formatter.remove(0);
+        match meta {
+            FmtMeta::Color(color) => {
+                let first = fmt.split_at(fmt_start).0;
+                msgbuilder.message_mut(&String::from_iter(first.iter()));
+                for _ in 0..fmt_start {
+                    fmt.remove(0);
+                }
+                msgbuilder.message_mut(&String::from_iter(formatter.iter()));
+                msgbuilder.foreground_color_mut(color);
+            }
+            FmtMeta::String(s) => {
+                for c in s.chars().rev() {
+                    fmt.insert(fmt_start, *c);
+                }
+            }
+            FmtMeta::ToStringable(s) => {
+                for c in s.to_string().chars().rev() {
+                    fmt.insert(fmt_start, *c);
+                }
+            }
+            FmtMeta::Hex(num) => {
+                fmt.insert(fmt_start, tohex(num >> 4));
+                fmt.insert(fmt_start, tohex(num & 0xf));
+            }
+            FmtMeta::Pointer(mut p) => {
+                for _ in 0..16 {
+                    fmt.insert(fmt_start, tohex((p & 0xf) as u8));
+                    p >>= 4;
+                }
+            }
+        }
+    }
+    let mut rests = Vec::new();
+    while !fmt.is_empty() && fmt[0] != '{' {
+        rests.push(fmt.remove(0));
+    }
+    msgbuilder.message_mut(&String::from_iter(rests.iter()));
+    msgbuilder
+}

src/lib.rs

@@ -1,69 +1,14 @@
 #![no_std]
+#![feature(strict_provenance)]
 
 extern crate alloc;
 
-use alloc::{
+use core::panic::PanicInfo;
-    string::{String, ToString},
-    vec::Vec,
-};
-use core::{panic::PanicInfo, ptr::null_mut};
-
-use kernel::tty::tty::{self, tty_enable, tty_text_print, Color};
 
 pub mod kernel;
 pub mod libk;
 
 #[panic_handler]
-unsafe fn kernel_panic_handler(info: &PanicInfo) -> ! {
+unsafe fn kernel_panic_handler(_info: &PanicInfo) -> ! {
-    let line_in_file = if let Some(loca) = info.location() {
-        loca.line().to_string()
-    } else {
-        String::new()
-    };
-    let info = {
-        let mut v = Vec::new();
-        v.push(("Kernel Panic: ", (Color::RED, Color::BLACK)));
-        v.push((
-            if let Some(loca) = info.location() {
-                loca.file()
-            } else {
-                "NoFile"
-            },
-            (Color::GREEN, Color::BLACK),
-        ));
-        v.push((":", (Color::WHITE, Color::BLACK)));
-        v.push((
-            if let Some(_) = info.location() {
-                line_in_file.as_str()
-            } else {
-                "NoLine"
-            },
-            (Color::WHITE, Color::BLACK),
-        ));
-        v.push((": ", (Color::WHITE, Color::BLACK)));
-        v.push((
-            if let Some(&s) = info.payload().downcast_ref::<&str>() {
-                s
-            } else {
-                "Unknown panic."
-            },
-            (Color::BLUE, Color::BLACK),
-        ));
-        v.push(("\n", (Color::BLACK, Color::BLACK)));
-        v
-    };
-    let tty = tty::tty_get(0);
-    if tty != null_mut() {
-        let tty = *tty;
-        tty_enable(tty);
-        for (msgo, (fgc, bgc)) in info.into_iter() {
-            let msg = String::from(msgo).as_bytes_mut() as *mut [u8] as *mut u8;
-            let p = msg.offset(msgo.len() as isize);
-            let swp = *p;
-            *p = 0;
-            tty_text_print(tty, msg, u32::from(fgc), u32::from(bgc));
-            *p = swp;
-        }
-    }
     loop {}
 }

src/libk/alloc/boxed.rs

@@ -0,0 +1,38 @@
+use core::{
+    alloc::Layout,
+    mem::transmute,
+    ops::{Deref, DerefMut},
+    ptr::addr_of,
+};
+
+use alloc::alloc::alloc;
+
+pub struct Box<T: ?Sized> {
+    inner: *mut T,
+}
+
+impl<T> Box<T> {
+    pub fn new(t: T) -> Self {
+        unsafe {
+            let inner = alloc(Layout::for_value(&t));
+            inner.copy_from(addr_of!(t).cast(), 1);
+            Self {
+                inner: transmute(inner),
+            }
+        }
+    }
+}
+
+impl<T: ?Sized> Deref for Box<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        unsafe { self.inner.as_ref().unwrap() }
+    }
+}
+
+impl<T: ?Sized> DerefMut for Box<T> {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        unsafe { self.inner.as_mut().unwrap() }
+    }
+}

src/libk/alloc/mod.rs

@@ -0,0 +1,3 @@
+pub mod boxed;
+pub mod string;
+pub mod vec;

src/libk/alloc/string.rs

@@ -0,0 +1,81 @@
+use core::ops::{Add, AddAssign};
+
+use super::vec::{Vec, VecIterator};
+
+#[derive(Clone, Default)]
+pub struct String {
+    data: Vec<char>,
+    u8data: Vec<u8>,
+}
+
+impl String {
+    pub fn new() -> Self {
+        Self {
+            data: Vec::new(),
+            u8data: Vec::new(),
+        }
+    }
+
+    pub fn len(&self) -> usize {
+        self.data.len()
+    }
+
+    pub fn chars(&self) -> VecIterator<char> {
+        self.data.iter()
+    }
+
+    pub fn as_bytes(&self) -> &[u8] {
+        &self.u8data[..]
+    }
+
+    pub unsafe fn as_bytes_mut(&mut self) -> &mut [u8] {
+        &mut self.u8data[..]
+    }
+}
+
+impl FromIterator<char> for String {
+    fn from_iter<T: IntoIterator<Item = char>>(iter: T) -> Self {
+        let data = Vec::from_iter(iter);
+        let u8data = Vec::from_iter(data.iter().map(|c| *c as u8));
+        Self { data, u8data }
+    }
+}
+
+impl<'a> FromIterator<&'a char> for String {
+    fn from_iter<T: IntoIterator<Item = &'a char>>(iter: T) -> Self {
+        let data = Vec::from_iter(iter.into_iter().map(|c| *c));
+        let u8data = Vec::from_iter(data.iter().map(|c| *c as u8));
+        Self { data, u8data }
+    }
+}
+
+impl ToString for String {
+    fn to_string(&self) -> String {
+        self.clone()
+    }
+}
+
+impl Add for String {
+    type Output = Self;
+
+    fn add(mut self, rhs: Self) -> Self::Output {
+        self.data.append(&mut rhs.chars().map(|c| *c).collect());
+        self
+    }
+}
+
+impl AddAssign for String {
+    fn add_assign(&mut self, rhs: String) {
+        *self = self.clone() + rhs;
+    }
+}
+
+pub trait ToString {
+    fn to_string(&self) -> String;
+}
+
+impl ToString for str {
+    fn to_string(&self) -> String {
+        String::from_iter(self.chars())
+    }
+}

src/libk/alloc/vec.rs

@@ -0,0 +1,280 @@
+use core::{
+    alloc::Layout,
+    ops::{Index, IndexMut, Range, RangeFull},
+    ptr::{addr_of_mut, null_mut},
+    slice,
+};
+
+use alloc::alloc::{alloc, dealloc};
+
+pub struct Vec<T> {
+    pointer: *mut T,
+    length: usize,
+    capacity: usize,
+}
+
+impl<T: Default> Vec<T> {
+    pub fn new() -> Self {
+        Self {
+            pointer: null_mut(),
+            length: 0,
+            capacity: 0,
+        }
+    }
+
+    unsafe fn extend_capacity(&mut self) {
+        let newp = alloc(Layout::array::<T>(self.capacity * 2).unwrap()).cast();
+        self.pointer.copy_to(newp, self.length);
+        dealloc(
+            self.pointer.cast(),
+            Layout::array::<T>(self.capacity).unwrap(),
+        );
+        self.pointer = newp;
+        self.capacity *= 2;
+    }
+
+    pub fn push(&mut self, item: T) {
+        if self.pointer.is_null() {
+            self.pointer = unsafe { alloc(Layout::array::<T>(4).unwrap()).cast() };
+            self.capacity = 4;
+            self.length = 0;
+        }
+        if self.capacity == self.length {
+            unsafe { self.extend_capacity() }
+        }
+        unsafe { self.pointer.offset(self.length as isize).write(item) };
+        self.length += 1;
+    }
+
+    pub fn insert(&mut self, index: usize, item: T) {
+        if self.capacity == self.length {
+            unsafe { self.extend_capacity() }
+        }
+        let rearlen = self.length - index;
+        unsafe {
+            if rearlen != 0 {
+                let tmp = alloc(Layout::array::<T>(rearlen).unwrap()).cast();
+                self.pointer.offset(index as isize).copy_to(tmp, rearlen);
+                self.pointer.offset(index as isize).write(item);
+                self.pointer
+                    .offset(index as isize + 1)
+                    .copy_from(tmp, rearlen);
+            } else {
+                self.pointer.offset(self.length as isize).write(item);
+            }
+        }
+        self.length += 1;
+    }
+
+    pub fn append(&mut self, v: &mut Self) {
+        while self.capacity < self.length + v.length {
+            unsafe { self.extend_capacity() }
+        }
+        unsafe {
+            self.pointer
+                .offset(self.length as isize)
+                .copy_from(v.pointer.cast_const(), v.length)
+        };
+        self.length += v.length;
+    }
+
+    pub fn split_at(&self, index: usize) -> (&[T], &[T]) {
+        if index >= self.length {
+            panic!("Index out of bound.");
+        }
+        (&self[0..index], &self[index..self.length])
+    }
+
+    pub fn len(&self) -> usize {
+        self.length
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.length == 0
+    }
+
+    pub fn last_mut(&mut self) -> Option<&mut T> {
+        unsafe { self.pointer.offset(self.length as isize - 1).as_mut() }
+    }
+
+    pub fn last(&self) -> Option<&T> {
+        unsafe { self.pointer.offset(self.length as isize - 1).as_ref() }
+    }
+
+    pub fn remove(&mut self, index: usize) -> T {
+        if index >= self.length {
+            panic!("Index out of bound.");
+        }
+        let mut t: T = T::default();
+        let pt = addr_of_mut!(t);
+        unsafe {
+            pt.copy_from(self.pointer.offset(index as isize).cast_const(), 1);
+            self.pointer.offset(index as isize).copy_from(
+                self.pointer.offset(index as isize + 1),
+                self.length - index - 1,
+            );
+        }
+        t
+    }
+
+    pub fn iter(&self) -> VecIterator<T> {
+        VecIterator {
+            pointer: self.pointer,
+            index: 0,
+            length: self.length,
+            _phantom: &(),
+        }
+    }
+}
+
+impl<T: Default> Default for Vec<T> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<T: Default> Index<usize> for Vec<T> {
+    type Output = T;
+
+    fn index(&self, index: usize) -> &Self::Output {
+        unsafe { self.pointer.offset(index as isize).as_ref().unwrap() }
+    }
+}
+
+impl<T: Default> Index<Range<usize>> for Vec<T> {
+    type Output = [T];
+
+    fn index(&self, index: Range<usize>) -> &Self::Output {
+        unsafe { &slice::from_raw_parts_mut(self.pointer, self.length)[index] }
+    }
+}
+
+impl<T: Default> Index<RangeFull> for Vec<T> {
+    type Output = [T];
+
+    fn index(&self, _: RangeFull) -> &Self::Output {
+        unsafe { slice::from_raw_parts(self.pointer.cast(), self.length) }
+    }
+}
+
+impl<T: Default> IndexMut<RangeFull> for Vec<T> {
+    fn index_mut(&mut self, _: RangeFull) -> &mut Self::Output {
+        unsafe { slice::from_raw_parts_mut(self.pointer.cast(), self.length) }
+    }
+}
+
+impl<T: Default> Clone for Vec<T> {
+    fn clone(&self) -> Self {
+        let res = Self {
+            pointer: unsafe { alloc(Layout::array::<T>(self.capacity).unwrap()).cast() },
+            length: self.length,
+            capacity: self.capacity,
+        };
+        unsafe {
+            res.pointer
+                .copy_from(self.pointer.cast_const(), self.length)
+        };
+        res
+    }
+}
+
+impl<T> Drop for Vec<T> {
+    fn drop(&mut self) {
+        unsafe {
+            dealloc(
+                self.pointer.cast(),
+                Layout::array::<T>(self.capacity).unwrap(),
+            )
+        };
+    }
+}
+
+impl<T: Default> FromIterator<T> for Vec<T> {
+    fn from_iter<U: IntoIterator<Item = T>>(iter: U) -> Self {
+        let mut res = Vec::new();
+        for i in iter {
+            res.push(i);
+        }
+        res
+    }
+}
+
+impl<T: Default> IntoIterator for Vec<T> {
+    type Item = T;
+
+    type IntoIter = VecIter<T>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        todo!()
+    }
+}
+
+pub struct VecIterator<'a, T> {
+    pointer: *mut T,
+    index: usize,
+    length: usize,
+    _phantom: &'a (),
+}
+
+impl<'a, T: 'a> Iterator for VecIterator<'a, T> {
+    type Item = &'a T;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.index == self.length {
+            None
+        } else {
+            let res = unsafe { Some(self.pointer.offset(self.index as isize).as_ref().unwrap()) };
+            self.index += 1;
+            res
+        }
+    }
+}
+
+impl<'a, T: 'a> DoubleEndedIterator for VecIterator<'a, T> {
+    fn next_back(&mut self) -> Option<Self::Item> {
+        if self.index == 0 {
+            None
+        } else {
+            self.index -= 1;
+            unsafe { Some(self.pointer.offset(self.index as isize).as_ref().unwrap()) }
+        }
+    }
+}
+
+pub struct VecIter<T> {
+    pointer: *mut T,
+    index: usize,
+    length: usize,
+    capacity: usize,
+}
+
+impl<T: Default> Iterator for VecIter<T> {
+    type Item = T;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.index == self.length {
+            None
+        } else {
+            let mut t = T::default();
+            let res = unsafe {
+                self.pointer
+                    .offset(self.index as isize)
+                    .copy_to(addr_of_mut!(t), 1);
+                Some(t)
+            };
+            self.index += 1;
+            res
+        }
+    }
+}
+
+impl<T> Drop for VecIter<T> {
+    fn drop(&mut self) {
+        unsafe {
+            dealloc(
+                self.pointer.cast(),
+                Layout::array::<T>(self.capacity).unwrap(),
+            )
+        };
+    }
+}

src/libk/mod.rs

@@ -1 +1,2 @@
-pub mod string;
+pub mod alloc;
+pub mod core;