Support building for Windows with or without UNICODE

1 files changed, 73 insertions, 0 deletions

diff --git a/src/win32/win32_util.c b/src/win32/win32_util.c
new file mode 100644
index 0000000..959867c
--- /dev/null
+++ b/src/win32/win32_util.c
@@ -0,0 +1,73 @@
+// Copyright 2019-2024 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#include "win32_util.h"
+
+#include <limits.h>
+#include <windows.h>
+
+#ifdef UNICODE
+
+ArgPathChar*
+arg_path_new(ZixAllocator* const allocator, const char* const path)
+{
+  return zix_utf8_to_wchar(allocator, path);
+}
+
+void
+arg_path_free(ZixAllocator* const allocator, ArgPathChar* const path)
+{
+  zix_free(allocator, path);
+}
+
+#else // !defined(UNICODE)
+
+ArgPathChar*
+arg_path_new(ZixAllocator* const allocator, const char* const path)
+{
+  (void)allocator;
+  return path;
+}
+
+void
+arg_path_free(ZixAllocator* const allocator, ArgPathChar* const path)
+{
+  (void)allocator;
+  (void)path;
+}
+
+#endif
+
+wchar_t*
+zix_utf8_to_wchar(ZixAllocator* const allocator, const char* const utf8)
+{
+  const int rc = utf8 ? MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0) : 0;
+  if (rc <= 0 || rc == INT_MAX) {
+    return NULL;
+  }
+
+  wchar_t* const result =
+    (wchar_t*)zix_calloc(allocator, (size_t)rc, sizeof(wchar_t));
+  if (result) {
+    MultiByteToWideChar(CP_UTF8, 0, utf8, -1, result, rc);
+  }
+
+  return result;
+}
+
+char*
+zix_wchar_to_utf8(ZixAllocator* const allocator, const wchar_t* const wstr)
+{
+  const int rc =
+    wstr ? WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL) : 0;
+  if (rc <= 0 || rc == INT_MAX) {
+    return NULL;
+  }
+
+  char* const result = (char*)zix_calloc(allocator, (size_t)rc, sizeof(char));
+  if (result) {
+    WideCharToMultiByte(CP_UTF8, 0, wstr, -1, result, rc, NULL, NULL);
+  }
+
+  return result;
+}