Fix normalizing paths

Author: stevapple

Sources/TSCBasic/Path.swift

@@ -454,7 +454,7 @@ private struct UNIXPath: Path {
 
         let path: String = String(cString: fsr)
         let dir: String = path.withCString(encodedAs: UTF16.self) {
-            let data = UnsafeMutaßlePointer(mutating: $0)
+            let data = UnsafeMutablePointer(mutating: $0)
             PathCchRemoveFileSpec(data, path.count)
             return String(decodingCString: data, as: UTF16.self)
         }
@@ -549,11 +549,14 @@ private struct UNIXPath: Path {
 
     init(normalizingAbsolutePath path: String) {
       #if os(Windows)
-        var buffer: [WCHAR] = Array<WCHAR>(repeating: 0, count: Int(MAX_PATH + 1))
+        var result: PWSTR?
+        defer { LocalFree(result) }
+
         _ = path.withCString(encodedAs: UTF16.self) {
-            PathCanonicalizeW(&buffer, $0)
+            PathAllocCanonicalize($0, ULONG(PATHCCH_ALLOW_LONG_PATHS.rawValue), &result)
         }
-        self.init(string: String(decodingCString: buffer, as: UTF16.self))
+
+        self.init(string: String(decodingCString: result!, as: UTF16.self))
       #else
         precondition(path.first == "/", "Failure normalizing \(path), absolute paths should start with '/'")
 
@@ -619,11 +622,18 @@ private struct UNIXPath: Path {
 
     init(normalizingRelativePath path: String) {
       #if os(Windows)
-        var buffer: [WCHAR] = Array<WCHAR>(repeating: 0, count: Int(MAX_PATH + 1))
+        var result: PWSTR?
+        defer { LocalFree(result) }
+
         _ = path.replacingOccurrences(of: "/", with: "\\").withCString(encodedAs: UTF16.self) {
-            PathCanonicalizeW(&buffer, $0)
+            PathAllocCanonicalize($0, ULONG(PATHCCH_ALLOW_LONG_PATHS.rawValue), &result)
+        }
+
+        var canonicalized: String = String(decodingCString: result!, as: UTF16.self)
+        if canonicalized == "" || canonicalized == "\\" {
+            canonicalized = "."
         }
-        self.init(string: String(decodingCString: buffer, as: UTF16.self))
+        self.init(string: canonicalized)
       #else
         precondition(path.first != "/")