1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
#![allow(dead_code)]
use crate::os::windows::prelude::*;
use crate::sys::windows::os::current_exe;
use crate::sys::c;
use crate::ffi::OsString;
use crate::fmt;
use crate::vec;
use crate::slice;
use crate::path::PathBuf;
use core::iter;
pub unsafe fn init(_argc: isize, _argv: *const *const u8) { }
pub unsafe fn cleanup() { }
pub fn args() -> Args {
unsafe {
let lp_cmd_line = c::GetCommandLineW();
let parsed_args_list = parse_lp_cmd_line(
lp_cmd_line as *const u16,
|| current_exe().map(PathBuf::into_os_string).unwrap_or_else(|_| OsString::new()));
Args { parsed_args_list: parsed_args_list.into_iter() }
}
}
unsafe fn parse_lp_cmd_line<F: Fn() -> OsString>(lp_cmd_line: *const u16, exe_name: F)
-> Vec<OsString> {
const BACKSLASH: u16 = '\\' as u16;
const QUOTE: u16 = '"' as u16;
const TAB: u16 = '\t' as u16;
const SPACE: u16 = ' ' as u16;
let mut ret_val = Vec::new();
if lp_cmd_line.is_null() || *lp_cmd_line == 0 {
ret_val.push(exe_name());
return ret_val;
}
let mut cmd_line = {
let mut end = 0;
while *lp_cmd_line.offset(end) != 0 {
end += 1;
}
slice::from_raw_parts(lp_cmd_line, end as usize)
};
cmd_line = match cmd_line[0] {
QUOTE => {
let args = {
let mut cut = cmd_line[1..].splitn(2, |&c| c == QUOTE);
if let Some(exe) = cut.next() {
ret_val.push(OsString::from_wide(exe));
}
cut.next()
};
if let Some(args) = args {
args
} else {
return ret_val;
}
}
0..=SPACE => {
ret_val.push(OsString::new());
&cmd_line[1..]
},
_ => {
let args = {
let mut cut = cmd_line.splitn(2, |&c| c > 0 && c <= SPACE);
if let Some(exe) = cut.next() {
ret_val.push(OsString::from_wide(exe));
}
cut.next()
};
if let Some(args) = args {
args
} else {
return ret_val;
}
}
};
let mut cur = Vec::new();
let mut in_quotes = false;
let mut was_in_quotes = false;
let mut backslash_count: usize = 0;
for &c in cmd_line {
match c {
BACKSLASH => {
backslash_count += 1;
was_in_quotes = false;
},
QUOTE if backslash_count % 2 == 0 => {
cur.extend(iter::repeat(b'\\' as u16).take(backslash_count / 2));
backslash_count = 0;
if was_in_quotes {
cur.push('"' as u16);
was_in_quotes = false;
} else {
was_in_quotes = in_quotes;
in_quotes = !in_quotes;
}
}
QUOTE if backslash_count % 2 != 0 => {
cur.extend(iter::repeat(b'\\' as u16).take(backslash_count / 2));
backslash_count = 0;
was_in_quotes = false;
cur.push(b'"' as u16);
}
SPACE | TAB if !in_quotes => {
cur.extend(iter::repeat(b'\\' as u16).take(backslash_count));
if !cur.is_empty() || was_in_quotes {
ret_val.push(OsString::from_wide(&cur[..]));
cur.truncate(0);
}
backslash_count = 0;
was_in_quotes = false;
}
_ => {
cur.extend(iter::repeat(b'\\' as u16).take(backslash_count));
backslash_count = 0;
was_in_quotes = false;
cur.push(c);
}
}
}
cur.extend(iter::repeat(b'\\' as u16).take(backslash_count));
if !cur.is_empty() || was_in_quotes || in_quotes {
ret_val.push(OsString::from_wide(&cur[..]));
}
ret_val
}
pub struct Args {
parsed_args_list: vec::IntoIter<OsString>,
}
pub struct ArgsInnerDebug<'a> {
args: &'a Args,
}
impl<'a> fmt::Debug for ArgsInnerDebug<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.args.parsed_args_list.as_slice().fmt(f)
}
}
impl Args {
pub fn inner_debug(&self) -> ArgsInnerDebug<'_> {
ArgsInnerDebug {
args: self
}
}
}
impl Iterator for Args {
type Item = OsString;
fn next(&mut self) -> Option<OsString> { self.parsed_args_list.next() }
fn size_hint(&self) -> (usize, Option<usize>) { self.parsed_args_list.size_hint() }
}
impl DoubleEndedIterator for Args {
fn next_back(&mut self) -> Option<OsString> { self.parsed_args_list.next_back() }
}
impl ExactSizeIterator for Args {
fn len(&self) -> usize { self.parsed_args_list.len() }
}
#[cfg(test)]
mod tests {
use crate::sys::windows::args::*;
use crate::ffi::OsString;
fn chk(string: &str, parts: &[&str]) {
let mut wide: Vec<u16> = OsString::from(string).encode_wide().collect();
wide.push(0);
let parsed = unsafe {
parse_lp_cmd_line(wide.as_ptr() as *const u16, || OsString::from("TEST.EXE"))
};
let expected: Vec<OsString> = parts.iter().map(|k| OsString::from(k)).collect();
assert_eq!(parsed.as_slice(), expected.as_slice());
}
#[test]
fn empty() {
chk("", &["TEST.EXE"]);
chk("\0", &["TEST.EXE"]);
}
#[test]
fn single_words() {
chk("EXE one_word", &["EXE", "one_word"]);
chk("EXE a", &["EXE", "a"]);
chk("EXE 😅", &["EXE", "😅"]);
chk("EXE 😅🤦", &["EXE", "😅🤦"]);
}
#[test]
fn official_examples() {
chk(r#"EXE "abc" d e"#, &["EXE", "abc", "d", "e"]);
chk(r#"EXE a\\\b d"e f"g h"#, &["EXE", r#"a\\\b"#, "de fg", "h"]);
chk(r#"EXE a\\\"b c d"#, &["EXE", r#"a\"b"#, "c", "d"]);
chk(r#"EXE a\\\\"b c" d e"#, &["EXE", r#"a\\b c"#, "d", "e"]);
}
#[test]
fn whitespace_behavior() {
chk(r#" test"#, &["", "test"]);
chk(r#" test"#, &["", "test"]);
chk(r#" test test2"#, &["", "test", "test2"]);
chk(r#" test test2"#, &["", "test", "test2"]);
chk(r#"test test2 "#, &["test", "test2"]);
chk(r#"test test2 "#, &["test", "test2"]);
chk(r#"test "#, &["test"]);
}
#[test]
fn genius_quotes() {
chk(r#"EXE "" """#, &["EXE", "", ""]);
chk(r#"EXE "" """"#, &["EXE", "", "\""]);
chk(
r#"EXE "this is """all""" in the same argument""#,
&["EXE", "this is \"all\" in the same argument"]
);
chk(r#"EXE "a"""#, &["EXE", "a\""]);
chk(r#"EXE "a"" a"#, &["EXE", "a\"", "a"]);
chk(r#""EXE" check"#, &["EXE", "check"]);
chk(r#""EXE check""#, &["EXE check"]);
chk(r#""EXE """for""" check"#, &["EXE ", r#"for""#, "check"]);
chk(r#""EXE \"for\" check"#, &[r#"EXE \"#, r#"for""#, "check"]);
}
}