itoa::write
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target
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Cargo.lock
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sudo: false
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language: rust
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rust:
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- nightly
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notifications:
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email: false
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@ -0,0 +1,8 @@
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[package]
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||||||
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name = "itoa"
|
||||||
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version = "0.1.0"
|
||||||
|
authors = ["David Tolnay <dtolnay@gmail.com>"]
|
||||||
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license = "MIT/Apache-2.0"
|
||||||
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description = "Fast functions for printing integer primitives to an io::Write"
|
||||||
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repository = "https://github.com/dtolnay/itoa"
|
||||||
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documentation = "https://github.com/dtolnay/itoa"
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Apache License
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@ -0,0 +1,55 @@
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|
itoa
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||||||
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====
|
||||||
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|
||||||
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[![Build Status](https://api.travis-ci.org/dtolnay/itoa.svg?branch=master)](https://travis-ci.org/dtolnay/itoa)
|
||||||
|
[![Latest Version](https://img.shields.io/crates/v/itoa.svg)](https://crates.io/crates/itoa)
|
||||||
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|
||||||
|
This crate provides fast functions for printing integer primitives to an
|
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[`io::Write`](https://doc.rust-lang.org/std/io/trait.Write.html). The
|
||||||
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implementation comes straight from
|
||||||
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[libcore](https://github.com/rust-lang/rust/blob/b8214dc6c6fc20d0a660fb5700dca9ebf51ebe89/src/libcore/fmt/num.rs#L201-L254)
|
||||||
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but avoids the performance penalty of going through
|
||||||
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[`fmt::Formatter`](https://doc.rust-lang.org/std/fmt/struct.Formatter.html).
|
||||||
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|
||||||
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## Functions
|
||||||
|
|
||||||
|
```rust
|
||||||
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extern crate itoa;
|
||||||
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|
||||||
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let buf = Vec::new();
|
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itoa::write(buf, 128u64).unwrap();
|
||||||
|
```
|
||||||
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|
||||||
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The function signature is:
|
||||||
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|
||||||
|
```rust
|
||||||
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fn write<W: io::Write, V: itoa::Integer>(writer: &mut W, value: V) -> io::Result<()>
|
||||||
|
```
|
||||||
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|
||||||
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where `itoa::Integer` is implemented for `i8`, `u8`, `i16`, `u16`, `i32`, `u32`,
|
||||||
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`i64`, `u64`, `isize` and `usize`.
|
||||||
|
|
||||||
|
## Dependency
|
||||||
|
|
||||||
|
Itoa is available on [crates.io](https://crates.io/crates/itoa). Use the
|
||||||
|
following in `Cargo.toml`:
|
||||||
|
|
||||||
|
```toml
|
||||||
|
[dependencies]
|
||||||
|
itoa = "0.1"
|
||||||
|
```
|
||||||
|
|
||||||
|
## License
|
||||||
|
|
||||||
|
Licensed under either of
|
||||||
|
|
||||||
|
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
|
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|
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
|
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|
at your option.
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|
### Contribution
|
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|
|
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|
Unless you explicitly state otherwise, any contribution intentionally submitted
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|
for inclusion in itoa by you, as defined in the Apache-2.0 license, shall be
|
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dual licensed as above, without any additional terms or conditions.
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|
@ -0,0 +1,52 @@
|
||||||
|
#![feature(test)]
|
||||||
|
#![allow(non_snake_case)]
|
||||||
|
|
||||||
|
extern crate itoa;
|
||||||
|
extern crate test;
|
||||||
|
|
||||||
|
macro_rules! benches {
|
||||||
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($($name:ident($value:expr),)*) => {
|
||||||
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mod bench_itoa {
|
||||||
|
use test::{Bencher, black_box};
|
||||||
|
$(
|
||||||
|
#[bench]
|
||||||
|
fn $name(b: &mut Bencher) {
|
||||||
|
use itoa;
|
||||||
|
|
||||||
|
let mut buf = Vec::with_capacity(20);
|
||||||
|
|
||||||
|
b.iter(|| {
|
||||||
|
buf.clear();
|
||||||
|
itoa::write(&mut buf, black_box($value)).unwrap()
|
||||||
|
});
|
||||||
|
}
|
||||||
|
)*
|
||||||
|
}
|
||||||
|
|
||||||
|
mod bench_fmt {
|
||||||
|
use test::{Bencher, black_box};
|
||||||
|
$(
|
||||||
|
#[bench]
|
||||||
|
fn $name(b: &mut Bencher) {
|
||||||
|
use std::io::Write;
|
||||||
|
|
||||||
|
let mut buf = Vec::with_capacity(20);
|
||||||
|
|
||||||
|
b.iter(|| {
|
||||||
|
buf.clear();
|
||||||
|
write!(&mut buf, "{}", black_box($value)).unwrap()
|
||||||
|
});
|
||||||
|
}
|
||||||
|
)*
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
benches!(
|
||||||
|
bench_0u64(0u64),
|
||||||
|
bench_HALFu64(<u32>::max_value() as u64),
|
||||||
|
bench_MAXu64(<u64>::max_value()),
|
||||||
|
|
||||||
|
bench_0i16(0i16),
|
||||||
|
bench_MINi16(<i16>::min_value()),
|
||||||
|
);
|
|
@ -0,0 +1,97 @@
|
||||||
|
// Copyright 2016 Itoa Developers
|
||||||
|
//
|
||||||
|
// 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 std::{io, mem, ptr, slice};
|
||||||
|
|
||||||
|
pub fn write<W: io::Write, V: Integer>(wr: &mut W, value: V) -> io::Result<()> {
|
||||||
|
value.write(wr)
|
||||||
|
}
|
||||||
|
|
||||||
|
pub trait Integer {
|
||||||
|
fn write<W: io::Write>(self, &mut W) -> io::Result<()>;
|
||||||
|
}
|
||||||
|
|
||||||
|
const DEC_DIGITS_LUT: &'static[u8] =
|
||||||
|
b"0001020304050607080910111213141516171819\
|
||||||
|
2021222324252627282930313233343536373839\
|
||||||
|
4041424344454647484950515253545556575859\
|
||||||
|
6061626364656667686970717273747576777879\
|
||||||
|
8081828384858687888990919293949596979899";
|
||||||
|
|
||||||
|
// Adaptation of the original implementation at
|
||||||
|
// https://github.com/rust-lang/rust/blob/b8214dc6c6fc20d0a660fb5700dca9ebf51ebe89/src/libcore/fmt/num.rs#L188-L266
|
||||||
|
macro_rules! impl_Integer {
|
||||||
|
($($t:ident),* as $conv_fn:ident) => ($(
|
||||||
|
impl Integer for $t {
|
||||||
|
#[allow(unused_comparisons)]
|
||||||
|
fn write<W: io::Write>(self, wr: &mut W) -> io::Result<()> {
|
||||||
|
let is_nonnegative = self >= 0;
|
||||||
|
let mut n = if is_nonnegative {
|
||||||
|
self as $conv_fn
|
||||||
|
} else {
|
||||||
|
try!(wr.write_all(b"-"));
|
||||||
|
// convert the negative num to positive by summing 1 to it's 2 complement
|
||||||
|
(!(self as $conv_fn)).wrapping_add(1)
|
||||||
|
};
|
||||||
|
let mut buf: [u8; 20] = unsafe { mem::uninitialized() };
|
||||||
|
let mut curr = buf.len() as isize;
|
||||||
|
let buf_ptr = buf.as_mut_ptr();
|
||||||
|
let lut_ptr = DEC_DIGITS_LUT.as_ptr();
|
||||||
|
|
||||||
|
unsafe {
|
||||||
|
// eagerly decode 4 characters at a time
|
||||||
|
if <$t>::max_value() as u64 >= 10000 {
|
||||||
|
while n >= 10000 {
|
||||||
|
let rem = (n % 10000) as isize;
|
||||||
|
n /= 10000;
|
||||||
|
|
||||||
|
let d1 = (rem / 100) << 1;
|
||||||
|
let d2 = (rem % 100) << 1;
|
||||||
|
curr -= 4;
|
||||||
|
ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2);
|
||||||
|
ptr::copy_nonoverlapping(lut_ptr.offset(d2), buf_ptr.offset(curr + 2), 2);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// if we reach here numbers are <= 9999, so at most 4 chars long
|
||||||
|
let mut n = n as isize; // possibly reduce 64bit math
|
||||||
|
|
||||||
|
// decode 2 more chars, if > 2 chars
|
||||||
|
if n >= 100 {
|
||||||
|
let d1 = (n % 100) << 1;
|
||||||
|
n /= 100;
|
||||||
|
curr -= 2;
|
||||||
|
ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2);
|
||||||
|
}
|
||||||
|
|
||||||
|
// decode last 1 or 2 chars
|
||||||
|
if n < 10 {
|
||||||
|
curr -= 1;
|
||||||
|
*buf_ptr.offset(curr) = (n as u8) + 48;
|
||||||
|
} else {
|
||||||
|
let d1 = n << 1;
|
||||||
|
curr -= 2;
|
||||||
|
ptr::copy_nonoverlapping(lut_ptr.offset(d1), buf_ptr.offset(curr), 2);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
wr.write_all(unsafe {
|
||||||
|
slice::from_raw_parts(buf_ptr.offset(curr), buf.len() - curr as usize)
|
||||||
|
})
|
||||||
|
}
|
||||||
|
})*);
|
||||||
|
}
|
||||||
|
|
||||||
|
impl_Integer!(i8, u8, i16, u16, i32, u32 as u32);
|
||||||
|
impl_Integer!(i64, u64 as u64);
|
||||||
|
#[cfg(target_pointer_width = "16")]
|
||||||
|
impl_Integer!(isize, usize as u16);
|
||||||
|
#[cfg(target_pointer_width = "32")]
|
||||||
|
impl_Integer!(isize, usize as u32);
|
||||||
|
#[cfg(target_pointer_width = "64")]
|
||||||
|
impl_Integer!(isize, usize as u64);
|
|
@ -0,0 +1,25 @@
|
||||||
|
#![allow(non_snake_case)]
|
||||||
|
|
||||||
|
extern crate itoa;
|
||||||
|
|
||||||
|
macro_rules! test {
|
||||||
|
($($name:ident($value:expr, $expected:expr),)*) => {
|
||||||
|
$(
|
||||||
|
#[test]
|
||||||
|
fn $name() {
|
||||||
|
let mut buf = Vec::with_capacity(20);
|
||||||
|
itoa::write(&mut buf, $value).unwrap();
|
||||||
|
assert_eq!(buf, $expected.as_bytes());
|
||||||
|
}
|
||||||
|
)*
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
test!(
|
||||||
|
test_0u64(0u64, "0"),
|
||||||
|
test_HALFu64(<u32>::max_value() as u64, "4294967295"),
|
||||||
|
test_MAXu64(<u64>::max_value(), "18446744073709551615"),
|
||||||
|
|
||||||
|
test_0i16(0i16, "0"),
|
||||||
|
test_MINi16(<i16>::min_value(), "-32768"),
|
||||||
|
);
|
Loading…
Reference in New Issue