2 files changed, 31 insertions, 2 deletions
diff --git a/src/libstd/sys/windows/backtrace.rs b/src/libstd/sys/windows/backtrace.rs
index 92e309da34b..51cf3032423 100644
--- a/src/libstd/sys/windows/backtrace.rs
+++ b/src/libstd/sys/windows/backtrace.rs
@@ -25,7 +25,7 @@
 #![allow(dead_code)]
 
 use dynamic_lib::DynamicLibrary;
-use ffi;
+use ffi::CStr;
 use intrinsics;
 use old_io::{IoResult, Writer};
 use libc;
@@ -362,7 +362,7 @@ pub fn write(w: &mut Writer) -> IoResult<()> {
         if ret == libc::TRUE {
             try!(write!(w, " - "));
             let ptr = info.Name.as_ptr() as *const libc::c_char;
-            let bytes = unsafe { ffi::c_str_to_bytes(&ptr) };
+            let bytes = unsafe { CStr::from_ptr(ptr).to_bytes() };
             match str::from_utf8(bytes) {
                 Ok(s) => try!(demangle(w, s)),
                 Err(..) => try!(w.write_all(&bytes[..bytes.len()-1])),
diff --git a/src/libstd/sys/windows/process.rs b/src/libstd/sys/windows/process.rs
index e001cd9a1ec..60d24e6174f 100644
--- a/src/libstd/sys/windows/process.rs
+++ b/src/libstd/sys/windows/process.rs
@@ -589,6 +589,7 @@ fn make_command_line(prog: &CString, args: &[CString]) -> String {
     }
 }
 
+#[cfg(stage0)]
 fn with_envp<K, V, T, F>(env: Option<&collections::HashMap<K, V>>, cb: F) -> T
     where K: BytesContainer + Eq + Hash<Hasher>,
           V: BytesContainer,
@@ -616,6 +617,34 @@ fn with_envp<K, V, T, F>(env: Option<&collections::HashMap<K, V>>, cb: F) -> T
         _ => cb(ptr::null_mut())
     }
 }
+#[cfg(not(stage0))]
+fn with_envp<K, V, T, F>(env: Option<&collections::HashMap<K, V>>, cb: F) -> T
+    where K: BytesContainer + Eq + Hash,
+          V: BytesContainer,
+          F: FnOnce(*mut c_void) -> T,
+{
+    // On Windows we pass an "environment block" which is not a char**, but
+    // rather a concatenation of null-terminated k=v\0 sequences, with a final
+    // \0 to terminate.
+    match env {
+        Some(env) => {
+            let mut blk = Vec::new();
+
+            for pair in env {
+                let kv = format!("{}={}",
+                                 pair.0.container_as_str().unwrap(),
+                                 pair.1.container_as_str().unwrap());
+                blk.extend(kv.utf16_units());
+                blk.push(0);
+            }
+
+            blk.push(0);
+
+            cb(blk.as_mut_ptr() as *mut c_void)
+        }
+        _ => cb(ptr::null_mut())
+    }
+}
 
 fn with_dirp<T, F>(d: Option<&CString>, cb: F) -> T where
     F: FnOnce(*const u16) -> T,