1 files changed, 37 insertions, 0 deletions
diff --git a/src/win32/environment_win32.c b/src/win32/environment_win32.c
new file mode 100644
index 0000000..ce5f00e
--- /dev/null
+++ b/src/win32/environment_win32.c
@@ -0,0 +1,37 @@
+// Copyright 2012-2024 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "win32_util.h"
+
+#include <zix/environment.h>
+
+#include <windows.h>
+
+char*
+zix_expand_environment_strings(ZixAllocator* const allocator,
+                               const char* const   string)
+{
+  ArgPathChar* const wstring = arg_path_new(allocator, string);
+
+  const DWORD size = ExpandEnvironmentStrings(wstring, NULL, 0U);
+  if (!size) {
+    arg_path_free(allocator, wstring);
+    return NULL;
+  }
+
+  TCHAR* const out =
+    (TCHAR*)zix_calloc(allocator, (size_t)size + 1U, sizeof(TCHAR));
+  if (out) {
+    ExpandEnvironmentStrings(wstring, out, size + 1U);
+  }
+
+  arg_path_free(allocator, wstring);
+
+#ifdef UNICODE
+  char* const result = zix_wchar_to_utf8(allocator, out);
+  zix_free(allocator, out);
+  return result;
+#else
+  return out;
+#endif
+}