Deal with NT paths in GetFinalPathNameByHandle

When calling QueryObjectName, NT namespaced paths can be returned. This
change appropriately strips the prefix to turn it into an absolute path.

(The above behaviour was observed at least in Wine so far)

Co-authored-by: Ryan Liptak <[email protected]>

Author: moosichu

lib/std/os/windows.zig

@@ -1221,10 +1221,27 @@ pub fn GetFinalPathNameByHandle(
             // parse the string to separate volume path from file path
             const expected_prefix = std.unicode.utf8ToUtf16LeStringLiteral("\\Device\\");
 
-            // TODO find out if a path can start with something besides `\Device\<volume name>`,
-            // and if we need to handle it differently
-            // (i.e. how to determine the start and end of the volume name in that case)
-            if (!mem.eql(u16, expected_prefix, final_path[0..expected_prefix.len])) return error.Unexpected;
+            // We aren't entirely sure of the structure of the path returned by
+            // QueryObjectName in all contexts/environments.
+            // This code is written to cover the various cases that have
+            // been encountered and solved appropriately. But note that there's
+            // no easy way to verify that they have all been tackled!
+            // (Unless you, the reader knows of one then please do action that!)
+            if (!mem.eql(u16, expected_prefix, final_path[0..expected_prefix.len])) {
+                // Wine seems to return NT namespaced paths from QueryObjectName
+                // (e.g. `\??\Z:\some\path\to\a\file.txt`), in which case we can just strip the
+                // prefix to turn it into an absolute path
+                if (getNamespacePrefix(u16, final_path) == .nt) {
+                    const unprefixed_path = final_path[4..];
+                    // TODO: Handle other possible path types, only drive absolute has been observed so far
+                    if (getUnprefixedPathType(u16, unprefixed_path) != .drive_absolute) {
+                        return error.Unexpected;
+                    }
+                    mem.copyForwards(u16, out_buffer[0..unprefixed_path.len], unprefixed_path);
+                    return out_buffer[0..unprefixed_path.len];
+                }
+                return error.Unexpected;
+            }
 
             const file_path_begin_index = mem.indexOfPos(u16, final_path, expected_prefix.len, &[_]u16{'\\'}) orelse unreachable;
             const volume_name_u16 = final_path[0..file_path_begin_index];