Add zix_expand_environment_strings()

1 files changed, 22 insertions, 0 deletions

diff --git a/src/win32/environment_win32.c b/src/win32/environment_win32.c
new file mode 100644
index 0000000..e7a0ee3
--- /dev/null
+++ b/src/win32/environment_win32.c
@@ -0,0 +1,22 @@
+// Copyright 2012-2024 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include <zix/environment.h>
+
+#include <windows.h>
+
+char*
+zix_expand_environment_strings(ZixAllocator* const allocator,
+                               const char* const   string)
+{
+  const DWORD size = ExpandEnvironmentStrings(string, NULL, 0U);
+  if (!size) {
+    return NULL;
+  }
+
+  char* const out = (char*)zix_calloc(allocator, 1U, size + 1U);
+  if (out) {
+    ExpandEnvironmentStrings(string, out, size + 1U);
+  }
+  return out;
+}