}
}
+pub fn wmemchr(needle: u16, haystack: &[u16]) -> Option<usize> {
+ extern "C" {
+ fn wmemchr(s: *const u16, c: u16, n: usize) -> *mut u16;
+ }
+ let len = haystack.len();
+ let ptr = haystack.as_ptr();
+ let p = unsafe { wmemchr(ptr, needle, len) };
+ if p.is_null() { None } else { Some((p as usize - ptr as usize) / 2) }
+}
+
pub fn to_u16s<S: AsRef<OsStr>>(s: S) -> crate::io::Result<Vec<u16>> {
fn inner(s: &OsStr) -> crate::io::Result<Vec<u16>> {
let mut maybe_result: Vec<u16> = s.encode_wide().collect();
- if maybe_result.iter().any(|&u| u == 0) {
+ if wmemchr(0, &maybe_result).is_some() {
return Err(crate::io::Error::new(
ErrorKind::InvalidInput,
"strings passed to WinAPI cannot contain NULs",
}
pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] {
- match v.iter().position(|c| *c == 0) {
+ match wmemchr(0, v) {
// don't include the 0
Some(i) => &v[..i],
None => v,