From 5ab368dd00b178f7af5f4f932af44585a4eba34e Mon Sep 17 00:00:00 2001
From: Xu Jun <693788454@qq.com>
Date: Sun, 24 Apr 2022 10:39:18 +0800
Subject: [PATCH] Support va_args in libc-builtin (#1117)

Implement vprintf/sprintf/snprintf wrapper functions for libc-builtin.
---
 .../libc-builtin/libc_builtin_wrapper.c       |  3 +++
 .../app/libc-builtin-sysroot/include/stdarg.h | 27 +++++++++++++++++++
 .../share/defined-symbols.txt                 |  3 +++
 3 files changed, 33 insertions(+)
 create mode 100644 wamr-sdk/app/libc-builtin-sysroot/include/stdarg.h

diff --git a/core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c b/core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c
index f2c97afb..239ff38a 100644
--- a/core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c
+++ b/core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c
@@ -1067,6 +1067,9 @@ static NativeSymbol native_symbols_libc_builtin[] = {
     REG_NATIVE_FUNC(printf, "($*)i"),
     REG_NATIVE_FUNC(sprintf, "($$*)i"),
     REG_NATIVE_FUNC(snprintf, "(*~$*)i"),
+    { "vprintf", printf_wrapper, "($*)i", NULL },
+    { "vsprintf", sprintf_wrapper, "($$*)i", NULL },
+    { "vsnprintf", snprintf_wrapper, "(*~$*)i", NULL },
     REG_NATIVE_FUNC(puts, "($)i"),
     REG_NATIVE_FUNC(putchar, "(i)i"),
     REG_NATIVE_FUNC(memcmp, "(**~)i"),
diff --git a/wamr-sdk/app/libc-builtin-sysroot/include/stdarg.h b/wamr-sdk/app/libc-builtin-sysroot/include/stdarg.h
new file mode 100644
index 00000000..50959573
--- /dev/null
+++ b/wamr-sdk/app/libc-builtin-sysroot/include/stdarg.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#ifndef _WAMR_LIBC_STDARG_H
+#define _WAMR_LIBC_STDARG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _VA_LIST
+typedef __builtin_va_list va_list;
+#define _VA_LIST
+#endif
+#define va_start(ap, param) __builtin_va_start(ap, param)
+#define va_end(ap) __builtin_va_end(ap)
+#define va_arg(ap, type) __builtin_va_arg(ap, type)
+
+#define __va_copy(d, s) __builtin_va_copy(d, s)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* end of _WAMR_LIBC_STDARG_H */
diff --git a/wamr-sdk/app/libc-builtin-sysroot/share/defined-symbols.txt b/wamr-sdk/app/libc-builtin-sysroot/share/defined-symbols.txt
index 332aedb7..fc9c400a 100644
--- a/wamr-sdk/app/libc-builtin-sysroot/share/defined-symbols.txt
+++ b/wamr-sdk/app/libc-builtin-sysroot/share/defined-symbols.txt
@@ -26,6 +26,9 @@ wasm_get_sys_tick_ms
 printf
 sprintf
 snprintf
+vprintf
+vsprintf
+vsnprintf
 puts
 putchar
 memcmp