[SDK:CRT] Implement stdarg.h

SDK/INC/CRT/stdarg.h

@@ -0,0 +1,36 @@
+/*++
+
+Copyright (c) 2024, Quinn Stephens.
+Provided under the BSD 3-Clause license.
+
+Module Name:
+
+   stdarg.h
+
+Abstract:
+
+   Provides variable arguments definitions.
+
+--*/
+
+#pragma once
+
+#ifndef _STDARG_H
+#define _STDARG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef __builtin_va_list va_list;
+
+#define va_start(ap, v) __builtin_va_start(ap, v)
+#define va_arg(ap, t)   __builtin_va_arg(ap, t)
+#define va_copy(ap, s)  __builtin_va_copy(ap, s)
+#define va_end(ap)      __builtin_va_end(ap)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_STDARG_H */