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/// php-src: ext/standard/exec.c `php_escape_shell_cmd` (PHP 8.5.2)
///
/// Unix branch only. Shell metacharacters are backslash-escaped; quote characters are escaped
/// only when unpaired, paired quotes being left intact. The multibyte skip (`php_mblen`), the
/// command length check and the Windows branch are not ported.
pub fn escapeshellcmd(command: &str) -> String {
let bytes = command.as_bytes();
let len = bytes.len();
let mut out: Vec<u8> = Vec::with_capacity(len);
// Byte index of the matching closing quote while inside a paired quote run.
let mut paired: Option<usize> = None;
let mut x = 0;
while x < len {
let c = bytes[x];
match c {
b'"' | b'\'' => {
if paired.is_none() {
if let Some(rel) = bytes[x + 1..].iter().position(|&b| b == c) {
paired = Some(x + 1 + rel);
} else {
out.push(b'\\');
}
} else if paired == Some(x) {
paired = None;
} else {
out.push(b'\\');
}
out.push(c);
}
b'#' | b'&' | b';' | b'`' | b'|' | b'*' | b'?' | b'~' | b'<' | b'>' | b'^' | b'('
| b')' | b'[' | b']' | b'{' | b'}' | b'$' | b'\\' | 0x0A | 0xFF => {
out.push(b'\\');
out.push(c);
}
_ => out.push(c),
}
x += 1;
}
String::from_utf8_lossy(&out).into_owned()
}
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