+++ /dev/null
-// 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.
-
-//! A bare-metal library supplying functions rustc may lower code to
-//!
-//! This library is not intended for general use, and is superseded by a system
-//! libc if one is available. In a freestanding context, however, common
-//! functions such as memset, memcpy, etc are not implemented. This library
-//! provides an implementation of these functions which are either required by
-//! libcore or called by rustc implicitly.
-//!
-//! This library is never included by default, and must be manually included if
-//! necessary. It is an error to include this library when also linking with
-//! the system libc library.
-
-#![crate_name = "rlibc"]
-#![experimental]
-#![license = "MIT/ASL2"]
-#![crate_type = "rlib"]
-#![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
- html_favicon_url = "http://www.rust-lang.org/favicon.ico",
- html_root_url = "http://doc.rust-lang.org/nightly/")]
-
-#![feature(import_shadowing, intrinsics, phase)]
-#![no_std]
-
-// This library defines the builtin functions, so it would be a shame for
-// LLVM to optimize these function calls to themselves!
-#![no_builtins]
-
-#[phase(plugin, link)] extern crate core;
-
-#[cfg(test)] extern crate native;
-#[cfg(test)] extern crate test;
-
-#[cfg(test)] #[phase(plugin, link)] extern crate std;
-
-// Require the offset intrinsics for LLVM to properly optimize the
-// implementations below. If pointer arithmetic is done through integers the
-// optimizations start to break down.
-extern "rust-intrinsic" {
- fn offset<T>(dst: *const T, offset: int) -> *const T;
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn memcpy(dest: *mut u8, src: *const u8,
- n: uint) -> *mut u8 {
- let mut i = 0;
- while i < n {
- *(offset(dest as *const u8, i as int) as *mut u8) =
- *offset(src, i as int);
- i += 1;
- }
- return dest;
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn memmove(dest: *mut u8, src: *const u8,
- n: uint) -> *mut u8 {
- if src < dest as *const u8 { // copy from end
- let mut i = n;
- while i != 0 {
- i -= 1;
- *(offset(dest as *const u8, i as int) as *mut u8) =
- *offset(src, i as int);
- }
- } else { // copy from beginning
- let mut i = 0;
- while i < n {
- *(offset(dest as *const u8, i as int) as *mut u8) =
- *offset(src, i as int);
- i += 1;
- }
- }
- return dest;
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn memset(s: *mut u8, c: i32, n: uint) -> *mut u8 {
- let mut i = 0;
- while i < n {
- *(offset(s as *const u8, i as int) as *mut u8) = c as u8;
- i += 1;
- }
- return s;
-}
-
-#[no_mangle]
-pub unsafe extern "C" fn memcmp(s1: *const u8, s2: *const u8, n: uint) -> i32 {
- let mut i = 0;
- while i < n {
- let a = *offset(s1, i as int);
- let b = *offset(s2, i as int);
- if a != b {
- return a as i32 - b as i32
- }
- i += 1;
- }
- return 0;
-}
-
-#[cfg(test)]
-mod test {
- use core::str::StrPrelude;
- use core::slice::{SlicePrelude};
-
- use super::{memcmp, memset, memcpy, memmove};
-
- #[test]
- fn memcmp_single_byte_pointers() {
- unsafe {
- assert_eq!(memcmp(&0xFAu8, &0xFAu8, 1), 0x00);
- assert!(memcmp(&0xEFu8, &0xFEu8, 1) < 0x00);
- }
- }
-
- #[test]
- fn memcmp_strings() {
- {
- let (x, z) = ("Hello!", "Good Bye.");
- let l = x.len();
- unsafe {
- assert_eq!(memcmp(x.as_ptr(), x.as_ptr(), l), 0);
- assert!(memcmp(x.as_ptr(), z.as_ptr(), l) > 0);
- assert!(memcmp(z.as_ptr(), x.as_ptr(), l) < 0);
- }
- }
- {
- let (x, z) = ("hey!", "hey.");
- let l = x.len();
- unsafe {
- assert!(memcmp(x.as_ptr(), z.as_ptr(), l) < 0);
- }
- }
- }
-
- #[test]
- fn memset_single_byte_pointers() {
- let mut x: u8 = 0xFF;
- unsafe {
- memset(&mut x, 0xAA, 1);
- assert_eq!(x, 0xAA);
- memset(&mut x, 0x00, 1);
- assert_eq!(x, 0x00);
- x = 0x01;
- memset(&mut x, 0x12, 0);
- assert_eq!(x, 0x01);
- }
- }
-
- #[test]
- fn memset_array() {
- let mut buffer = [b'X', .. 100];
- unsafe {
- memset(buffer.as_mut_ptr(), b'#' as i32, buffer.len());
- }
- for byte in buffer.iter() { assert_eq!(*byte, b'#'); }
- }
-
- #[test]
- fn memcpy_and_memcmp_arrays() {
- let (src, mut dst) = ([b'X', .. 100], [b'Y', .. 100]);
- unsafe {
- assert!(memcmp(src.as_ptr(), dst.as_ptr(), 100) != 0);
- let _ = memcpy(dst.as_mut_ptr(), src.as_ptr(), 100);
- assert_eq!(memcmp(src.as_ptr(), dst.as_ptr(), 100), 0);
- }
- }
-
- #[test]
- fn memmove_overlapping() {
- {
- let mut buffer = [ b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9' ];
- unsafe {
- memmove(&mut buffer[4], &buffer[0], 6);
- let mut i = 0;
- for byte in b"0123012345".iter() {
- assert_eq!(buffer[i], *byte);
- i += 1;
- }
- }
- }
- {
- let mut buffer = [ b'0', b'1', b'2', b'3', b'4', b'5', b'6', b'7', b'8', b'9' ];
- unsafe {
- memmove(&mut buffer[0], &buffer[4], 6);
- let mut i = 0;
- for byte in b"4567896789".iter() {
- assert_eq!(buffer[i], *byte);
- i += 1;
- }
- }
- }
- }
-}
projects / rust.git / commitdiff