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coreutils/src/test/test.rs

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#![crate_name = "test"]
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#![feature(convert)]
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/*
* This file is part of the uutils coreutils package.
*
* (c) mahkoh (ju.orth [at] gmail [dot] com)
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
extern crate libc;
use std::collections::HashMap;
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use std::ffi::{CString, OsString};
use std::env::{args_os};
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use std::str::{from_utf8};
static NAME: &'static str = "test";
// TODO: decide how to handle non-UTF8 input for all the utils
pub fn uumain(_: Vec<String>) -> i32 {
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let args = args_os().collect::<Vec<OsString>>();
let args = args.iter().map(|a| a.to_bytes().unwrap()).collect::<Vec<&[u8]>>();
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if args.len() == 0 {
return 2;
}
let args =
if !args[0].ends_with(NAME.as_bytes()) {
&args[1..]
} else {
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&args[..]
};
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let args = match args[0] {
b"[" => match args[args.len() - 1] {
b"]" => &args[1..args.len() - 1],
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_ => return 2,
},
_ => &args[1..args.len()],
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};
let mut error = false;
let retval = 1 - parse_expr(args, &mut error) as i32;
if error {
2
} else {
retval
}
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}
fn one(args: &[&[u8]]) -> bool {
args[0].len() > 0
}
fn two(args: &[&[u8]], error: &mut bool) -> bool {
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match args[0] {
b"!" => !one(&args[1..]),
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b"-b" => path(args[1], PathCondition::BlockSpecial),
b"-c" => path(args[1], PathCondition::CharacterSpecial),
b"-d" => path(args[1], PathCondition::Directory),
b"-e" => path(args[1], PathCondition::Exists),
b"-f" => path(args[1], PathCondition::Regular),
b"-g" => path(args[1], PathCondition::GroupIDFlag),
b"-h" => path(args[1], PathCondition::SymLink),
b"-L" => path(args[1], PathCondition::SymLink),
b"-n" => one(&args[1..]),
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b"-p" => path(args[1], PathCondition::FIFO),
b"-r" => path(args[1], PathCondition::Readable),
b"-S" => path(args[1], PathCondition::Socket),
b"-s" => path(args[1], PathCondition::NonEmpty),
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b"-t" => isatty(args[1]),
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b"-u" => path(args[1], PathCondition::UserIDFlag),
b"-w" => path(args[1], PathCondition::Writable),
b"-x" => path(args[1], PathCondition::Executable),
b"-z" => !one(&args[1..]),
_ => {
*error = true;
false
}
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}
}
fn three(args: &[&[u8]], error: &mut bool) -> bool {
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match args[1] {
b"=" => args[0] == args[2],
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b"==" => args[0] == args[2],
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b"!=" => args[0] != args[2],
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b"-eq" => integers(args[0], args[2], IntegerCondition::Equal),
b"-ne" => integers(args[0], args[2], IntegerCondition::Unequal),
b"-gt" => integers(args[0], args[2], IntegerCondition::Greater),
b"-ge" => integers(args[0], args[2], IntegerCondition::GreaterEqual),
b"-lt" => integers(args[0], args[2], IntegerCondition::Less),
b"-le" => integers(args[0], args[2], IntegerCondition::LessEqual),
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_ => match args[0] {
b"!" => !two(&args[1..], error),
_ => {
*error = true;
false
}
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}
}
}
fn four(args: &[&[u8]], error: &mut bool) -> bool {
match args[0] {
b"!" => {
!three(&args[1..], error)
}
_ => {
*error = true;
false
}
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}
}
enum IntegerCondition {
Equal,
Unequal,
Greater,
GreaterEqual,
Less,
LessEqual,
}
fn integers(a: &[u8], b: &[u8], cond: IntegerCondition) -> bool {
let (a, b): (&str, &str) = match (from_utf8(a), from_utf8(b)) {
(Ok(a), Ok(b)) => (a, b),
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_ => return false,
};
let (a, b): (i64, i64) = match (a.parse(), b.parse()) {
(Ok(a), Ok(b)) => (a, b),
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_ => return false,
};
match cond {
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IntegerCondition::Equal => a == b,
IntegerCondition::Unequal => a != b,
IntegerCondition::Greater => a > b,
IntegerCondition::GreaterEqual => a >= b,
IntegerCondition::Less => a < b,
IntegerCondition::LessEqual => a <= b,
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}
}
fn isatty(fd: &[u8]) -> bool {
use libc::{isatty};
from_utf8(fd).ok().and_then(|s| s.parse().ok())
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.map(|i| unsafe { isatty(i) == 1 }).unwrap_or(false)
}
fn dispatch(args: &mut &[&[u8]], error: &mut bool) -> bool {
let (val, idx) = match args.len() {
0 => {
*error = true;
(false, 0)
}
1 => (one(*args), 1),
2 => dispatch_two(args, error),
3 => dispatch_three(args, error),
_ => dispatch_four(args, error)
};
*args = &(*args)[idx..];
val
}
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fn dispatch_two(args: &mut &[&[u8]], error: &mut bool) -> (bool, usize) {
let val = two(*args, error);
if *error {
*error = false;
(one(*args), 1)
} else {
(val, 2)
}
}
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fn dispatch_three(args: &mut &[&[u8]], error: &mut bool) -> (bool, usize) {
let val = three(*args, error);
if *error {
*error = false;
dispatch_two(args, error)
} else {
(val, 3)
}
}
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fn dispatch_four(args: &mut &[&[u8]], error: &mut bool) -> (bool, usize) {
let val = four(*args, error);
if *error {
*error = false;
dispatch_three(args, error)
} else {
(val, 4)
}
}
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#[derive(Clone, Copy)]
enum Precedence {
Unknown = 0,
Paren, // FIXME: this is useless (parentheses have not been implemented)
Or,
And,
BUnOp,
BinOp,
UnOp
}
fn parse_expr(mut args: &[&[u8]], error: &mut bool) -> bool {
if args.len() == 0 {
false
} else {
let hashmap = setup_hashmap();
let lhs = dispatch(&mut args, error);
if args.len() > 0 {
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parse_expr_helper(&hashmap, &mut args, lhs, Precedence::Unknown, error)
} else {
lhs
}
}
}
fn parse_expr_helper<'a>(hashmap: &HashMap<&'a [u8], Precedence>,
args: &mut &[&'a [u8]],
mut lhs: bool,
min_prec: Precedence,
error: &mut bool) -> bool {
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let mut prec = *hashmap.get(&args[0]).unwrap_or_else(|| {
*error = true;
&min_prec
});
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while !*error && args.len() > 0 && prec as usize >= min_prec as usize {
let op = args[0];
*args = &(*args)[1..];
let mut rhs = dispatch(args, error);
while args.len() > 0 {
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let subprec = *hashmap.get(&args[0]).unwrap_or_else(|| {
*error = true;
&min_prec
});
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if subprec as usize <= prec as usize || *error {
break;
}
rhs = parse_expr_helper(hashmap, args, rhs, subprec, error);
}
lhs = match prec {
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Precedence::UnOp | Precedence::BUnOp => {
*error = true;
false
}
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Precedence::And => lhs && rhs,
Precedence::Or => lhs || rhs,
Precedence::BinOp => three(&[if lhs { b" " } else { b"" }, op, if rhs { b" " } else { b"" }], error),
Precedence::Paren => unimplemented!(), // TODO: implement parentheses
_ => unreachable!()
};
if args.len() > 0 {
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prec = *hashmap.get(&args[0]).unwrap_or_else(|| {
*error = true;
&min_prec
});
}
}
lhs
}
#[inline]
fn setup_hashmap<'a>() -> HashMap<&'a [u8], Precedence> {
let mut hashmap = HashMap::<&'a [u8], Precedence>::new();
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hashmap.insert(b"-b", Precedence::UnOp);
hashmap.insert(b"-c", Precedence::UnOp);
hashmap.insert(b"-d", Precedence::UnOp);
hashmap.insert(b"-e", Precedence::UnOp);
hashmap.insert(b"-f", Precedence::UnOp);
hashmap.insert(b"-g", Precedence::UnOp);
hashmap.insert(b"-h", Precedence::UnOp);
hashmap.insert(b"-L", Precedence::UnOp);
hashmap.insert(b"-n", Precedence::UnOp);
hashmap.insert(b"-p", Precedence::UnOp);
hashmap.insert(b"-r", Precedence::UnOp);
hashmap.insert(b"-S", Precedence::UnOp);
hashmap.insert(b"-s", Precedence::UnOp);
hashmap.insert(b"-t", Precedence::UnOp);
hashmap.insert(b"-u", Precedence::UnOp);
hashmap.insert(b"-w", Precedence::UnOp);
hashmap.insert(b"-x", Precedence::UnOp);
hashmap.insert(b"-z", Precedence::UnOp);
hashmap.insert(b"=", Precedence::BinOp);
hashmap.insert(b"!=", Precedence::BinOp);
hashmap.insert(b"-eq", Precedence::BinOp);
hashmap.insert(b"-ne", Precedence::BinOp);
hashmap.insert(b"-gt", Precedence::BinOp);
hashmap.insert(b"-ge", Precedence::BinOp);
hashmap.insert(b"-lt", Precedence::BinOp);
hashmap.insert(b"-le", Precedence::BinOp);
hashmap.insert(b"!", Precedence::BUnOp);
hashmap.insert(b"-a", Precedence::And);
hashmap.insert(b"-o", Precedence::Or);
hashmap.insert(b"(", Precedence::Paren);
hashmap.insert(b")", Precedence::Paren);
hashmap
}
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#[derive(Eq, PartialEq)]
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enum PathCondition {
BlockSpecial,
CharacterSpecial,
Directory,
Exists,
Regular,
GroupIDFlag,
SymLink,
FIFO,
Readable,
Socket,
NonEmpty,
UserIDFlag,
Writable,
Executable,
}
#[cfg(not(windows))]
fn path(path: &[u8], cond: PathCondition) -> bool {
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use libc::{stat, lstat, S_IFMT, S_IFLNK, S_IFBLK, S_IFCHR, S_IFDIR, S_IFREG};
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use libc::{S_IFIFO, mode_t};
static S_ISUID: mode_t = 0o4000;
static S_ISGID: mode_t = 0o2000;
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static S_IFSOCK: mode_t = 0o140000;
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enum Permission {
Read = 0o4,
Write = 0o2,
Execute = 0o1,
}
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let perm = |stat: stat, p: Permission| {
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use libc::{getgid, getuid};
let (uid, gid) = unsafe { (getuid(), getgid()) };
if uid == stat.st_uid {
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stat.st_mode & ((p as mode_t) << 6) != 0
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} else if gid == stat.st_gid {
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stat.st_mode & ((p as mode_t) << 3) != 0
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} else {
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stat.st_mode & ((p as mode_t) << 0) != 0
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}
};
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let path = CString::new(path).unwrap();
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let mut stat = unsafe { std::mem::zeroed() };
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if cond == PathCondition::SymLink {
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if unsafe { lstat(path.as_ptr(), &mut stat) } == 0 {
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if stat.st_mode & S_IFMT == S_IFLNK {
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return true;
}
}
return false;
}
if unsafe { libc::stat(path.as_ptr(), &mut stat) } != 0 {
return false;
}
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let file_type = stat.st_mode & S_IFMT;
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match cond {
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PathCondition::BlockSpecial => file_type == S_IFBLK,
PathCondition::CharacterSpecial => file_type == S_IFCHR,
PathCondition::Directory => file_type == S_IFDIR,
PathCondition::Exists => true,
PathCondition::Regular => file_type == S_IFREG,
PathCondition::GroupIDFlag => stat.st_mode & S_ISGID != 0,
PathCondition::SymLink => true,
PathCondition::FIFO => file_type == S_IFIFO,
PathCondition::Readable => perm(stat, Permission::Read),
PathCondition::Socket => file_type == S_IFSOCK,
PathCondition::NonEmpty => stat.st_size > 0,
PathCondition::UserIDFlag => stat.st_mode & S_ISUID != 0,
PathCondition::Writable => perm(stat, Permission::Write),
PathCondition::Executable => perm(stat, Permission::Execute),
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}
}
#[cfg(windows)]
fn path(path: &[u8], cond: PathCondition) -> bool {
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use std::old_io::{TypeFile, TypeDirectory, TypeBlockSpecial, TypeNamedPipe};
use std::old_io::fs::{stat};
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use std::old_path::{Path};
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let path = match Path::new_opt(path) {
Some(p) => p,
None => return false,
};
let stat = match stat(&path) {
Ok(s) => s,
_ => return false,
};
match cond {
BlockSpecial => stat.kind == TypeBlockSpecial,
CharacterSpecial => false,
Directory => stat.kind == TypeDirectory,
Exists => true,
Regular => stat.kind == TypeFile,
GroupIDFlag => false,
SymLink => false,
FIFO => stat.kind == TypeNamedPipe,
Readable => false, // TODO
Socket => false, // TODO?
NonEmpty => stat.size > 0,
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UserIDFlag => false,
Writable => false, // TODO
Executable => false, // TODO
}
}