Strip any UNC long path prefix from _wgetcwd

- This keeps any UNC long file or device prefix (\\?\ and \\.\) out of
  URL that were relative and then resolved to absolute urls.

Author: daveinglis

Sources/CoreFoundation/CFPlatform.c

@@ -1140,9 +1140,18 @@ CF_EXPORT char *_NS_getcwd(char *dstbuf, size_t size) {
     if (!buf) {
         return NULL;
     }
+    
+    // Strip UNC-style prefixes (\\?\ and \\.\) from the wide character buffer
+    wchar_t *pathToConvert = buf;
+    size_t pathLen = wcslen(buf);
+    if (pathLen >= 4 && buf[0] == L'\\' && buf[1] == L'\\' && buf[3] == L'\\' &&
+        (buf[2] == L'?' || buf[2] == L'.')) {
+        // Skip the UNC prefix by advancing the pointer
+        pathToConvert = buf + 4;
+    }
 
     // Convert result to UTF8
-    copyToNarrowFileSystemRepresentation(buf, (CFIndex)size, dstbuf);
+    copyToNarrowFileSystemRepresentation(pathToConvert, (CFIndex)size, dstbuf);
     free(buf);
     return dstbuf;
 }