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//! Unsafe pointer utility functions
export addr_of;
export mut_addr_of;
export offset;
export const_offset;
export mut_offset;
export null;
export is_null;
export is_not_null;
export memcpy;
export memmove;
export memset;
export buf_len;
export position;
export extensions;
import libc::{c_void, size_t};
#[nolink]
#[abi = "cdecl"]
extern mod libc_ {
#[rust_stack]
fn memcpy(dest: *c_void, src: *c_void, n: libc::size_t) -> *c_void;
#[rust_stack]
fn memmove(dest: *c_void, src: *c_void, n: libc::size_t) -> *c_void;
#[rust_stack]
fn memset(dest: *c_void, c: libc::c_int, len: libc::size_t) -> *c_void;
}
#[abi = "rust-intrinsic"]
extern mod rusti {
fn addr_of<T>(val: T) -> *T;
}
/// Get an unsafe pointer to a value
#[inline(always)]
pure fn addr_of<T>(val: T) -> *T { unchecked { rusti::addr_of(val) } }
/// Get an unsafe mut pointer to a value
#[inline(always)]
pure fn mut_addr_of<T>(val: T) -> *mut T {
unsafe {
unsafe::reinterpret_cast(rusti::addr_of(val))
}
}
/// Calculate the offset from a pointer
#[inline(always)]
fn offset<T>(ptr: *T, count: uint) -> *T {
unsafe {
(ptr as uint + count * sys::size_of::<T>()) as *T
}
}
/// Calculate the offset from a const pointer
#[inline(always)]
fn const_offset<T>(ptr: *const T, count: uint) -> *const T {
unsafe {
(ptr as uint + count * sys::size_of::<T>()) as *T
}
}
/// Calculate the offset from a mut pointer
#[inline(always)]
fn mut_offset<T>(ptr: *mut T, count: uint) -> *mut T {
(ptr as uint + count * sys::size_of::<T>()) as *mut T
}
/// Return the offset of the first null pointer in `buf`.
#[inline(always)]
unsafe fn buf_len<T>(buf: **T) -> uint {
position(buf, |i| i == null())
}
/// Return the first offset `i` such that `f(buf[i]) == true`.
#[inline(always)]
unsafe fn position<T>(buf: *T, f: fn(T) -> bool) -> uint {
let mut i = 0u;
loop {
if f(*offset(buf, i)) { ret i; }
else { i += 1u; }
}
}
/// Create an unsafe null pointer
#[inline(always)]
pure fn null<T>() -> *T { unsafe { unsafe::reinterpret_cast(0u) } }
/// Returns true if the pointer is equal to the null pointer.
pure fn is_null<T>(ptr: *const T) -> bool { ptr == null() }
/// Returns true if the pointer is not equal to the null pointer.
pure fn is_not_null<T>(ptr: *const T) -> bool { !is_null(ptr) }
/**
* Copies data from one location to another
*
* Copies `count` elements (not bytes) from `src` to `dst`. The source
* and destination may not overlap.
*/
#[inline(always)]
unsafe fn memcpy<T>(dst: *T, src: *T, count: uint) {
let n = count * sys::size_of::<T>();
libc_::memcpy(dst as *c_void, src as *c_void, n as size_t);
}
/**
* Copies data from one location to another
*
* Copies `count` elements (not bytes) from `src` to `dst`. The source
* and destination may overlap.
*/
#[inline(always)]
unsafe fn memmove<T>(dst: *T, src: *T, count: uint) {
let n = count * sys::size_of::<T>();
libc_::memmove(dst as *c_void, src as *c_void, n as size_t);
}
#[inline(always)]
unsafe fn memset<T>(dst: *mut T, c: int, count: uint) {
let n = count * sys::size_of::<T>();
libc_::memset(dst as *c_void, c as libc::c_int, n as size_t);
}
/// Extension methods for pointers
impl extensions<T> for *T {
/// Returns true if the pointer is equal to the null pointer.
pure fn is_null() -> bool { is_null(self) }
/// Returns true if the pointer is not equal to the null pointer.
pure fn is_not_null() -> bool { is_not_null(self) }
}
#[test]
fn test() {
unsafe {
type pair = {mut fst: int, mut snd: int};
let p = {mut fst: 10, mut snd: 20};
let pptr: *mut pair = mut_addr_of(p);
let iptr: *mut int = unsafe::reinterpret_cast(pptr);
assert (*iptr == 10);;
*iptr = 30;
assert (*iptr == 30);
assert (p.fst == 30);;
*pptr = {mut fst: 50, mut snd: 60};
assert (*iptr == 50);
assert (p.fst == 50);
assert (p.snd == 60);
let v0 = ~[32000u16, 32001u16, 32002u16];
let v1 = ~[0u16, 0u16, 0u16];
ptr::memcpy(ptr::offset(vec::unsafe::to_ptr(v1), 1u),
ptr::offset(vec::unsafe::to_ptr(v0), 1u), 1u);
assert (v1[0] == 0u16 && v1[1] == 32001u16 && v1[2] == 0u16);
ptr::memcpy(vec::unsafe::to_ptr(v1),
ptr::offset(vec::unsafe::to_ptr(v0), 2u), 1u);
assert (v1[0] == 32002u16 && v1[1] == 32001u16 && v1[2] == 0u16);
ptr::memcpy(ptr::offset(vec::unsafe::to_ptr(v1), 2u),
vec::unsafe::to_ptr(v0), 1u);
assert (v1[0] == 32002u16 && v1[1] == 32001u16 && v1[2] == 32000u16);
}
}
#[test]
fn test_position() {
import str::as_c_str;
import libc::c_char;
let s = "hello";
unsafe {
assert 2u == as_c_str(s, |p| position(p, |c| c == 'l' as c_char));
assert 4u == as_c_str(s, |p| position(p, |c| c == 'o' as c_char));
assert 5u == as_c_str(s, |p| position(p, |c| c == 0 as c_char));
}
}
#[test]
fn test_buf_len() {
let s0 = "hello";
let s1 = "there";
let s2 = "thing";
do str::as_c_str(s0) |p0| {
do str::as_c_str(s1) |p1| {
do str::as_c_str(s2) |p2| {
let v = ~[p0, p1, p2, null()];
do vec::as_buf(v) |vp| {
assert unsafe { buf_len(vp) } == 3u;
}
}
}
}
}
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