1 files changed, 169 insertions, 0 deletions
diff --git a/third_party/rust/gcc/src/registry.rs b/third_party/rust/gcc/src/registry.rs
new file mode 100644
index 000000000..d871cd21f
--- /dev/null
+++ b/third_party/rust/gcc/src/registry.rs
@@ -0,0 +1,169 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::ffi::{OsString, OsStr};
+use std::io;
+use std::ops::RangeFrom;
+use std::os::raw;
+use std::os::windows::prelude::*;
+
+pub struct RegistryKey(Repr);
+
+type HKEY = *mut u8;
+type DWORD = u32;
+type LPDWORD = *mut DWORD;
+type LPCWSTR = *const u16;
+type LPWSTR = *mut u16;
+type LONG = raw::c_long;
+type PHKEY = *mut HKEY;
+type PFILETIME = *mut u8;
+type LPBYTE = *mut u8;
+type REGSAM = u32;
+
+const ERROR_SUCCESS: DWORD = 0;
+const ERROR_NO_MORE_ITEMS: DWORD = 259;
+const HKEY_LOCAL_MACHINE: HKEY = 0x80000002 as HKEY;
+const REG_SZ: DWORD = 1;
+const KEY_READ: DWORD = 0x20019;
+const KEY_WOW64_32KEY: DWORD = 0x200;
+
+#[link(name = "advapi32")]
+extern "system" {
+    fn RegOpenKeyExW(key: HKEY,
+                     lpSubKey: LPCWSTR,
+                     ulOptions: DWORD,
+                     samDesired: REGSAM,
+                     phkResult: PHKEY) -> LONG;
+    fn RegEnumKeyExW(key: HKEY,
+                     dwIndex: DWORD,
+                     lpName: LPWSTR,
+                     lpcName: LPDWORD,
+                     lpReserved: LPDWORD,
+                     lpClass: LPWSTR,
+                     lpcClass: LPDWORD,
+                     lpftLastWriteTime: PFILETIME) -> LONG;
+    fn RegQueryValueExW(hKey: HKEY,
+                        lpValueName: LPCWSTR,
+                        lpReserved: LPDWORD,
+                        lpType: LPDWORD,
+                        lpData: LPBYTE,
+                        lpcbData: LPDWORD) -> LONG;
+    fn RegCloseKey(hKey: HKEY) -> LONG;
+}
+
+struct OwnedKey(HKEY);
+
+enum Repr {
+    Const(HKEY),
+    Owned(OwnedKey),
+}
+
+pub struct Iter<'a> {
+    idx: RangeFrom<DWORD>,
+    key: &'a RegistryKey,
+}
+
+unsafe impl Sync for Repr {}
+unsafe impl Send for Repr {}
+
+pub static LOCAL_MACHINE: RegistryKey =
+    RegistryKey(Repr::Const(HKEY_LOCAL_MACHINE));
+
+impl RegistryKey {
+    fn raw(&self) -> HKEY {
+        match self.0 {
+            Repr::Const(val) => val,
+            Repr::Owned(ref val) => val.0,
+        }
+    }
+
+    pub fn open(&self, key: &OsStr) -> io::Result<RegistryKey> {
+        let key = key.encode_wide().chain(Some(0)).collect::<Vec<_>>();
+        let mut ret = 0 as *mut _;
+        let err = unsafe {
+            RegOpenKeyExW(self.raw(), key.as_ptr(), 0,
+                          KEY_READ | KEY_WOW64_32KEY, &mut ret)
+        };
+        if err == ERROR_SUCCESS as LONG {
+            Ok(RegistryKey(Repr::Owned(OwnedKey(ret))))
+        } else {
+            Err(io::Error::from_raw_os_error(err as i32))
+        }
+    }
+
+    pub fn iter(&self) -> Iter {
+        Iter { idx: 0.., key: self }
+    }
+
+    pub fn query_str(&self, name: &str) -> io::Result<OsString> {
+        let name: &OsStr = name.as_ref();
+        let name = name.encode_wide().chain(Some(0)).collect::<Vec<_>>();
+        let mut len = 0;
+        let mut kind = 0;
+        unsafe {
+            let err = RegQueryValueExW(self.raw(), name.as_ptr(), 0 as *mut _,
+                                       &mut kind, 0 as *mut _, &mut len);
+            if err != ERROR_SUCCESS as LONG {
+                return Err(io::Error::from_raw_os_error(err as i32))
+            }
+            if kind != REG_SZ {
+                return Err(io::Error::new(io::ErrorKind::Other,
+                                          "registry key wasn't a string"))
+            }
+
+            // The length here is the length in bytes, but we're using wide
+            // characters so we need to be sure to halve it for the capacity
+            // passed in.
+            let mut v = Vec::with_capacity(len as usize / 2);
+            let err = RegQueryValueExW(self.raw(), name.as_ptr(), 0 as *mut _,
+                                       0 as *mut _, v.as_mut_ptr() as *mut _,
+                                       &mut len);
+            if err != ERROR_SUCCESS as LONG {
+                return Err(io::Error::from_raw_os_error(err as i32))
+            }
+            v.set_len(len as usize / 2);
+
+            // Some registry keys may have a terminating nul character, but
+            // we're not interested in that, so chop it off if it's there.
+            if v[v.len() - 1] == 0 {
+                v.pop();
+            }
+            Ok(OsString::from_wide(&v))
+        }
+    }
+}
+
+impl Drop for OwnedKey {
+    fn drop(&mut self) {
+        unsafe { RegCloseKey(self.0); }
+    }
+}
+
+impl<'a> Iterator for Iter<'a> {
+    type Item = io::Result<OsString>;
+
+    fn next(&mut self) -> Option<io::Result<OsString>> {
+        self.idx.next().and_then(|i| unsafe {
+            let mut v = Vec::with_capacity(256);
+            let mut len = v.capacity() as DWORD;
+            let ret = RegEnumKeyExW(self.key.raw(), i, v.as_mut_ptr(), &mut len,
+                                    0 as *mut _, 0 as *mut _, 0 as *mut _,
+                                    0 as *mut _);
+            if ret == ERROR_NO_MORE_ITEMS as LONG {
+                None
+            } else if ret != ERROR_SUCCESS as LONG {
+                Some(Err(io::Error::from_raw_os_error(ret as i32)))
+            } else {
+                v.set_len(len as usize);
+                Some(Ok(OsString::from_wide(&v)))
+            }
+        })
+    }
+}