1 files changed, 334 insertions, 0 deletions
diff --git a/library/std/src/sys/windows/mod.rs b/library/std/src/sys/windows/mod.rs
new file mode 100644
index 00000000000..9a52371280e
--- /dev/null
+++ b/library/std/src/sys/windows/mod.rs
@@ -0,0 +1,334 @@
+#![allow(missing_docs, nonstandard_style)]
+
+use crate::ffi::{OsStr, OsString};
+use crate::io::ErrorKind;
+use crate::os::windows::ffi::{OsStrExt, OsStringExt};
+use crate::path::PathBuf;
+use crate::ptr;
+use crate::time::Duration;
+
+pub use self::rand::hashmap_random_keys;
+pub use libc::strlen;
+
+#[macro_use]
+pub mod compat;
+
+pub mod alloc;
+pub mod args;
+pub mod c;
+pub mod cmath;
+pub mod condvar;
+pub mod env;
+pub mod ext;
+pub mod fs;
+pub mod handle;
+pub mod io;
+pub mod memchr;
+pub mod mutex;
+pub mod net;
+pub mod os;
+pub mod os_str;
+pub mod path;
+pub mod pipe;
+pub mod process;
+pub mod rand;
+pub mod rwlock;
+pub mod thread;
+pub mod thread_local_dtor;
+pub mod thread_local_key;
+pub mod time;
+cfg_if::cfg_if! {
+    if #[cfg(not(target_vendor = "uwp"))] {
+        pub mod stdio;
+        pub mod stack_overflow;
+    } else {
+        pub mod stdio_uwp;
+        pub mod stack_overflow_uwp;
+        pub use self::stdio_uwp as stdio;
+        pub use self::stack_overflow_uwp as stack_overflow;
+    }
+}
+
+#[cfg(not(test))]
+pub fn init() {}
+
+pub fn decode_error_kind(errno: i32) -> ErrorKind {
+    match errno as c::DWORD {
+        c::ERROR_ACCESS_DENIED => return ErrorKind::PermissionDenied,
+        c::ERROR_ALREADY_EXISTS => return ErrorKind::AlreadyExists,
+        c::ERROR_FILE_EXISTS => return ErrorKind::AlreadyExists,
+        c::ERROR_BROKEN_PIPE => return ErrorKind::BrokenPipe,
+        c::ERROR_FILE_NOT_FOUND => return ErrorKind::NotFound,
+        c::ERROR_PATH_NOT_FOUND => return ErrorKind::NotFound,
+        c::ERROR_NO_DATA => return ErrorKind::BrokenPipe,
+        c::ERROR_INVALID_PARAMETER => return ErrorKind::InvalidInput,
+        c::ERROR_SEM_TIMEOUT
+        | c::WAIT_TIMEOUT
+        | c::ERROR_DRIVER_CANCEL_TIMEOUT
+        | c::ERROR_OPERATION_ABORTED
+        | c::ERROR_SERVICE_REQUEST_TIMEOUT
+        | c::ERROR_COUNTER_TIMEOUT
+        | c::ERROR_TIMEOUT
+        | c::ERROR_RESOURCE_CALL_TIMED_OUT
+        | c::ERROR_CTX_MODEM_RESPONSE_TIMEOUT
+        | c::ERROR_CTX_CLIENT_QUERY_TIMEOUT
+        | c::FRS_ERR_SYSVOL_POPULATE_TIMEOUT
+        | c::ERROR_DS_TIMELIMIT_EXCEEDED
+        | c::DNS_ERROR_RECORD_TIMED_OUT
+        | c::ERROR_IPSEC_IKE_TIMED_OUT
+        | c::ERROR_RUNLEVEL_SWITCH_TIMEOUT
+        | c::ERROR_RUNLEVEL_SWITCH_AGENT_TIMEOUT => return ErrorKind::TimedOut,
+        _ => {}
+    }
+
+    match errno {
+        c::WSAEACCES => ErrorKind::PermissionDenied,
+        c::WSAEADDRINUSE => ErrorKind::AddrInUse,
+        c::WSAEADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
+        c::WSAECONNABORTED => ErrorKind::ConnectionAborted,
+        c::WSAECONNREFUSED => ErrorKind::ConnectionRefused,
+        c::WSAECONNRESET => ErrorKind::ConnectionReset,
+        c::WSAEINVAL => ErrorKind::InvalidInput,
+        c::WSAENOTCONN => ErrorKind::NotConnected,
+        c::WSAEWOULDBLOCK => ErrorKind::WouldBlock,
+        c::WSAETIMEDOUT => ErrorKind::TimedOut,
+
+        _ => ErrorKind::Other,
+    }
+}
+
+pub fn unrolled_find_u16s(needle: u16, haystack: &[u16]) -> Option<usize> {
+    let ptr = haystack.as_ptr();
+    let mut len = haystack.len();
+    let mut start = &haystack[..];
+
+    // For performance reasons unfold the loop eight times.
+    while len >= 8 {
+        if start[0] == needle {
+            return Some((start.as_ptr() as usize - ptr as usize) / 2);
+        }
+        if start[1] == needle {
+            return Some((start[1..].as_ptr() as usize - ptr as usize) / 2);
+        }
+        if start[2] == needle {
+            return Some((start[2..].as_ptr() as usize - ptr as usize) / 2);
+        }
+        if start[3] == needle {
+            return Some((start[3..].as_ptr() as usize - ptr as usize) / 2);
+        }
+        if start[4] == needle {
+            return Some((start[4..].as_ptr() as usize - ptr as usize) / 2);
+        }
+        if start[5] == needle {
+            return Some((start[5..].as_ptr() as usize - ptr as usize) / 2);
+        }
+        if start[6] == needle {
+            return Some((start[6..].as_ptr() as usize - ptr as usize) / 2);
+        }
+        if start[7] == needle {
+            return Some((start[7..].as_ptr() as usize - ptr as usize) / 2);
+        }
+
+        start = &start[8..];
+        len -= 8;
+    }
+
+    for (i, c) in start.iter().enumerate() {
+        if *c == needle {
+            return Some((start.as_ptr() as usize - ptr as usize) / 2 + i);
+        }
+    }
+    None
+}
+
+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 unrolled_find_u16s(0, &maybe_result).is_some() {
+            return Err(crate::io::Error::new(
+                ErrorKind::InvalidInput,
+                "strings passed to WinAPI cannot contain NULs",
+            ));
+        }
+        maybe_result.push(0);
+        Ok(maybe_result)
+    }
+    inner(s.as_ref())
+}
+
+// Many Windows APIs follow a pattern of where we hand a buffer and then they
+// will report back to us how large the buffer should be or how many bytes
+// currently reside in the buffer. This function is an abstraction over these
+// functions by making them easier to call.
+//
+// The first callback, `f1`, is yielded a (pointer, len) pair which can be
+// passed to a syscall. The `ptr` is valid for `len` items (u16 in this case).
+// The closure is expected to return what the syscall returns which will be
+// interpreted by this function to determine if the syscall needs to be invoked
+// again (with more buffer space).
+//
+// Once the syscall has completed (errors bail out early) the second closure is
+// yielded the data which has been read from the syscall. The return value
+// from this closure is then the return value of the function.
+fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> crate::io::Result<T>
+where
+    F1: FnMut(*mut u16, c::DWORD) -> c::DWORD,
+    F2: FnOnce(&[u16]) -> T,
+{
+    // Start off with a stack buf but then spill over to the heap if we end up
+    // needing more space.
+    let mut stack_buf = [0u16; 512];
+    let mut heap_buf = Vec::new();
+    unsafe {
+        let mut n = stack_buf.len();
+        loop {
+            let buf = if n <= stack_buf.len() {
+                &mut stack_buf[..]
+            } else {
+                let extra = n - heap_buf.len();
+                heap_buf.reserve(extra);
+                heap_buf.set_len(n);
+                &mut heap_buf[..]
+            };
+
+            // This function is typically called on windows API functions which
+            // will return the correct length of the string, but these functions
+            // also return the `0` on error. In some cases, however, the
+            // returned "correct length" may actually be 0!
+            //
+            // To handle this case we call `SetLastError` to reset it to 0 and
+            // then check it again if we get the "0 error value". If the "last
+            // error" is still 0 then we interpret it as a 0 length buffer and
+            // not an actual error.
+            c::SetLastError(0);
+            let k = match f1(buf.as_mut_ptr(), n as c::DWORD) {
+                0 if c::GetLastError() == 0 => 0,
+                0 => return Err(crate::io::Error::last_os_error()),
+                n => n,
+            } as usize;
+            if k == n && c::GetLastError() == c::ERROR_INSUFFICIENT_BUFFER {
+                n *= 2;
+            } else if k >= n {
+                n = k;
+            } else {
+                return Ok(f2(&buf[..k]));
+            }
+        }
+    }
+}
+
+fn os2path(s: &[u16]) -> PathBuf {
+    PathBuf::from(OsString::from_wide(s))
+}
+
+#[allow(dead_code)] // Only used in backtrace::gnu::get_executable_filename()
+fn wide_char_to_multi_byte(
+    code_page: u32,
+    flags: u32,
+    s: &[u16],
+    no_default_char: bool,
+) -> crate::io::Result<Vec<i8>> {
+    unsafe {
+        let mut size = c::WideCharToMultiByte(
+            code_page,
+            flags,
+            s.as_ptr(),
+            s.len() as i32,
+            ptr::null_mut(),
+            0,
+            ptr::null(),
+            ptr::null_mut(),
+        );
+        if size == 0 {
+            return Err(crate::io::Error::last_os_error());
+        }
+
+        let mut buf = Vec::with_capacity(size as usize);
+        buf.set_len(size as usize);
+
+        let mut used_default_char = c::FALSE;
+        size = c::WideCharToMultiByte(
+            code_page,
+            flags,
+            s.as_ptr(),
+            s.len() as i32,
+            buf.as_mut_ptr(),
+            buf.len() as i32,
+            ptr::null(),
+            if no_default_char { &mut used_default_char } else { ptr::null_mut() },
+        );
+        if size == 0 {
+            return Err(crate::io::Error::last_os_error());
+        }
+        if no_default_char && used_default_char == c::TRUE {
+            return Err(crate::io::Error::new(
+                crate::io::ErrorKind::InvalidData,
+                "string cannot be converted to requested code page",
+            ));
+        }
+
+        buf.set_len(size as usize);
+
+        Ok(buf)
+    }
+}
+
+pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] {
+    match unrolled_find_u16s(0, v) {
+        // don't include the 0
+        Some(i) => &v[..i],
+        None => v,
+    }
+}
+
+pub trait IsZero {
+    fn is_zero(&self) -> bool;
+}
+
+macro_rules! impl_is_zero {
+    ($($t:ident)*) => ($(impl IsZero for $t {
+        fn is_zero(&self) -> bool {
+            *self == 0
+        }
+    })*)
+}
+
+impl_is_zero! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
+
+pub fn cvt<I: IsZero>(i: I) -> crate::io::Result<I> {
+    if i.is_zero() { Err(crate::io::Error::last_os_error()) } else { Ok(i) }
+}
+
+pub fn dur2timeout(dur: Duration) -> c::DWORD {
+    // Note that a duration is a (u64, u32) (seconds, nanoseconds) pair, and the
+    // timeouts in windows APIs are typically u32 milliseconds. To translate, we
+    // have two pieces to take care of:
+    //
+    // * Nanosecond precision is rounded up
+    // * Greater than u32::MAX milliseconds (50 days) is rounded up to INFINITE
+    //   (never time out).
+    dur.as_secs()
+        .checked_mul(1000)
+        .and_then(|ms| ms.checked_add((dur.subsec_nanos() as u64) / 1_000_000))
+        .and_then(|ms| ms.checked_add(if dur.subsec_nanos() % 1_000_000 > 0 { 1 } else { 0 }))
+        .map(|ms| if ms > <c::DWORD>::MAX as u64 { c::INFINITE } else { ms as c::DWORD })
+        .unwrap_or(c::INFINITE)
+}
+
+// On Windows, use the processor-specific __fastfail mechanism.  In Windows 8
+// and later, this will terminate the process immediately without running any
+// in-process exception handlers.  In earlier versions of Windows, this
+// sequence of instructions will be treated as an access violation,
+// terminating the process but without necessarily bypassing all exception
+// handlers.
+//
+// https://docs.microsoft.com/en-us/cpp/intrinsics/fastfail
+#[allow(unreachable_code)]
+pub fn abort_internal() -> ! {
+    #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
+    unsafe {
+        llvm_asm!("int $$0x29" :: "{ecx}"(7) ::: volatile); // 7 is FAST_FAIL_FATAL_APP_EXIT
+        crate::intrinsics::unreachable();
+    }
+    crate::intrinsics::abort();
+}