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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use cast;
use char::Char;
use clone::Clone;
use container::Container;
use default::Default;
use intrinsics;
use iter::{Iterator, FromIterator};
use mem;
use num::{CheckedMul, CheckedAdd};
use option::{Some, None};
use ptr::RawPtr;
use ptr;
use raw::Vec;
use slice::ImmutableVector;
use str::StrSlice;
#[cfg(not(test))] use ops::Add;
#[cfg(not(test))] use slice::Vector;
#[allow(ctypes)]
extern {
fn malloc(size: uint) -> *u8;
fn free(ptr: *u8);
}
unsafe fn alloc(cap: uint) -> *mut Vec<()> {
let cap = cap.checked_add(&mem::size_of::<Vec<()>>()).unwrap();
let ret = malloc(cap) as *mut Vec<()>;
if ret.is_null() {
intrinsics::abort();
}
(*ret).fill = 0;
(*ret).alloc = cap;
ret
}
// Strings
impl Default for ~str {
fn default() -> ~str {
unsafe {
// Get some memory
let ptr = alloc(0);
// Initialize the memory
(*ptr).fill = 0;
(*ptr).alloc = 0;
cast::transmute(ptr)
}
}
}
impl Clone for ~str {
fn clone(&self) -> ~str {
// Don't use the clone() implementation above because it'll start
// requiring the eh_personality lang item (no fun)
unsafe {
let bytes = self.as_bytes().as_ptr();
let len = self.len();
let ptr = alloc(len) as *mut Vec<u8>;
ptr::copy_nonoverlapping_memory(&mut (*ptr).data, bytes, len);
(*ptr).fill = len;
(*ptr).alloc = len;
cast::transmute(ptr)
}
}
}
impl FromIterator<char> for ~str {
#[inline]
fn from_iter<T: Iterator<char>>(mut iterator: T) -> ~str {
let (lower, _) = iterator.size_hint();
let mut cap = if lower == 0 {16} else {lower};
let mut len = 0;
let mut tmp = [0u8, ..4];
unsafe {
let mut ptr = alloc(cap) as *mut Vec<u8>;
let mut ret = cast::transmute(ptr);
for ch in iterator {
let amt = ch.encode_utf8(tmp);
if len + amt > cap {
cap = cap.checked_mul(&2).unwrap();
if cap < len + amt {
cap = len + amt;
}
let ptr2 = alloc(cap) as *mut Vec<u8>;
ptr::copy_nonoverlapping_memory(&mut (*ptr2).data,
&(*ptr).data,
len);
free(ptr as *u8);
cast::forget(ret);
ret = cast::transmute(ptr2);
ptr = ptr2;
}
let base = &mut (*ptr).data as *mut u8;
for byte in tmp.slice_to(amt).iter() {
*base.offset(len as int) = *byte;
len += 1;
}
(*ptr).fill = len;
}
ret
}
}
}
#[cfg(not(test))]
impl<'a> Add<&'a str,~str> for &'a str {
#[inline]
fn add(&self, rhs: & &'a str) -> ~str {
let amt = self.len().checked_add(&rhs.len()).unwrap();
unsafe {
let ptr = alloc(amt) as *mut Vec<u8>;
let base = &mut (*ptr).data as *mut _;
ptr::copy_nonoverlapping_memory(base,
self.as_bytes().as_ptr(),
self.len());
let base = base.offset(self.len() as int);
ptr::copy_nonoverlapping_memory(base,
rhs.as_bytes().as_ptr(),
rhs.len());
(*ptr).fill = amt;
(*ptr).alloc = amt;
cast::transmute(ptr)
}
}
}
// Arrays
impl<A: Clone> Clone for ~[A] {
#[inline]
fn clone(&self) -> ~[A] {
self.iter().map(|a| a.clone()).collect()
}
}
impl<A> FromIterator<A> for ~[A] {
fn from_iter<T: Iterator<A>>(mut iterator: T) -> ~[A] {
let (lower, _) = iterator.size_hint();
let cap = if lower == 0 {16} else {lower};
let mut cap = cap.checked_mul(&mem::size_of::<A>()).unwrap();
let mut len = 0;
unsafe {
let mut ptr = alloc(cap) as *mut Vec<A>;
let mut ret = cast::transmute(ptr);
for elt in iterator {
if len * mem::size_of::<A>() >= cap {
cap = cap.checked_mul(&2).unwrap();
let ptr2 = alloc(cap) as *mut Vec<A>;
ptr::copy_nonoverlapping_memory(&mut (*ptr2).data,
&(*ptr).data,
len);
free(ptr as *u8);
cast::forget(ret);
ret = cast::transmute(ptr2);
ptr = ptr2;
}
let base = &mut (*ptr).data as *mut A;
intrinsics::move_val_init(&mut *base.offset(len as int), elt);
len += 1;
(*ptr).fill = len * mem::nonzero_size_of::<A>();
}
ret
}
}
}
#[cfg(not(test))]
impl<'a,T:Clone, V: Vector<T>> Add<V, ~[T]> for &'a [T] {
#[inline]
fn add(&self, rhs: &V) -> ~[T] {
let first = self.iter().map(|t| t.clone());
first.chain(rhs.as_slice().iter().map(|t| t.clone())).collect()
}
}
#[cfg(not(test))]
impl<T:Clone, V: Vector<T>> Add<V, ~[T]> for ~[T] {
#[inline]
fn add(&self, rhs: &V) -> ~[T] {
self.as_slice() + rhs.as_slice()
}
}
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