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use std::borrow::Cow;
use std::ffi::{OsStr, OsString};
use std::iter::repeat;
use std::os::windows::ffi::{OsStrExt, OsStringExt};
/// Common UTF-16 code points.
mod utf16 {
pub const DOUBLEQUOTE: u16 = '"' as u16;
pub const BACKSLASH: u16 = '\\' as u16;
pub const SPACE: u16 = ' ' as u16;
pub const LINEFEED: u16 = '\n' as u16;
pub const HTAB: u16 = '\t' as u16;
pub const VTAB: u16 = 0x000B; // '\v'
}
/// Loselessly escape shell arguments on Windows.
///
/// Inspired by https://blogs.msdn.microsoft.com/twistylittlepassagesallalike/2011/04/23/everyone-quotes-command-line-arguments-the-wrong-way/.
/// Heavily based on https://github.com/sfackler/shell-escape
pub fn escape(s: Cow<OsStr>) -> Cow<OsStr> {
static ESCAPE_CHARS: &'static [u16] = &[
utf16::DOUBLEQUOTE,
utf16::SPACE,
utf16::LINEFEED,
utf16::HTAB,
utf16::VTAB,
];
let needs_escape = s.is_empty() || s.encode_wide().any(|ref c| ESCAPE_CHARS.contains(c));
if !needs_escape {
return s;
}
let mut escaped_wide_string: Vec<u16> = Vec::with_capacity(s.len() + 2);
escaped_wide_string.push(utf16::DOUBLEQUOTE);
let mut chars = s.encode_wide().peekable();
loop {
let mut num_slashes = 0;
while let Some(&utf16::BACKSLASH) = chars.peek() {
chars.next();
num_slashes += 1;
}
match chars.next() {
Some(utf16::DOUBLEQUOTE) => {
escaped_wide_string.extend(repeat(utf16::BACKSLASH).take(num_slashes * 2 + 1));
escaped_wide_string.push(utf16::DOUBLEQUOTE);
}
Some(c) => {
escaped_wide_string.extend(repeat(utf16::BACKSLASH).take(num_slashes));
escaped_wide_string.push(c);
}
None => {
escaped_wide_string.extend(repeat(utf16::BACKSLASH).take(num_slashes * 2));
break;
}
}
}
escaped_wide_string.push(utf16::DOUBLEQUOTE);
Cow::Owned(OsString::from_wide(&escaped_wide_string))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_no_escape() {
assert_eq!(
escape(Cow::Borrowed(OsStr::new("--aaa=bbb-ccc"))),
OsStr::new("--aaa=bbb-ccc")
);
}
#[test]
fn test_escape_empty_argument() {
assert_eq!(escape(Cow::Borrowed(OsStr::new(""))), OsStr::new(r#""""#));
}
#[test]
fn test_escape_argument_with_spaces() {
assert_eq!(
escape(Cow::Borrowed(OsStr::new("linker=gcc -L/foo -Wl,bar"))),
OsStr::new(r#""linker=gcc -L/foo -Wl,bar""#)
);
}
#[test]
fn test_escape_nested_quotes() {
assert_eq!(
escape(Cow::Borrowed(OsStr::new(r#"--features="default""#))),
OsStr::new(r#""--features=\"default\"""#)
);
}
#[test]
fn test_escape_multiple_backslashes_and_nested_quotes() {
assert_eq!(
escape(Cow::Borrowed(OsStr::new(r#"hello \\\"quote\\\""#))),
OsStr::new(r#""hello \\\\\\\"quote\\\\\\\"""#)
);
}
// Input:
// child.exe "\some\directory with\spaces\" argument2
//
// Parsed as:
// 0: [child.exe]
// 1: [\some\directory with\spaces" argument2]
#[test]
fn test_escape_trailing_backslash() {
assert_eq!(
escape(Cow::Borrowed(OsStr::new(r#"\some\directory with\spaces\"#))),
OsStr::new(r#""\some\directory with\spaces\\""#)
);
}
}
|
