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authorraywu <raywu0301@gmail.com>2018-06-15 00:00:50 +0800
committerraywu <raywu0301@gmail.com>2018-06-15 00:00:50 +0800
commitb7c51c9cf4864df6aabb99a1ae843becd577237c (patch)
treeeebe9b0d0ca03062955223097e57da84dd618b9a /EDK/Foundation/Include/EfiStdArg.h
downloadzprj-b7c51c9cf4864df6aabb99a1ae843becd577237c.tar.xz
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+/*++
+
+Copyright (c) 2004, Intel Corporation
+All rights reserved. This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+Module Name:
+
+ EfiStdArg.h
+
+Abstract:
+
+ Support for variable length argument lists using the ANSI standard.
+
+ Since we are using the ANSI standard we used the standard nameing and
+ did not folow the coding convention
+
+ VA_LIST - typedef for argument list.
+ VA_START (VA_LIST Marker, argument before the ...) - Init Marker for use.
+ VA_END (VA_LIST Marker) - Clear Marker
+ VA_ARG (VA_LIST Marker, var arg size) - Use Marker to get an argumnet from
+ the ... list. You must know the size and pass it in this macro.
+
+ example:
+
+ UINTN
+ ExampleVarArg (
+ IN UINTN NumberOfArgs,
+ ...
+ )
+ {
+ VA_LIST Marker;
+ UINTN Index;
+ UINTN Result;
+
+ //
+ // Initialize the Marker
+ //
+ VA_START (Marker, NumberOfArgs);
+ for (Index = 0, Result = 0; Index < NumberOfArgs; Index++) {
+ //
+ // The ... list is a series of UINTN values, so average them up.
+ //
+ Result += VA_ARG (Marker, UINTN);
+ }
+
+ VA_END (Marker);
+ return Result
+ }
+
+--*/
+
+#ifndef _EFISTDARG_H_
+#define _EFISTDARG_H_
+
+#define _EFI_INT_SIZE_OF(n) ((sizeof (n) + sizeof (UINTN) - 1) &~(sizeof (UINTN) - 1))
+
+//
+// Also support coding convention rules for var arg macros
+//
+#ifndef VA_START
+
+typedef CHAR8 *VA_LIST;
+#define VA_START(ap, v) (ap = (VA_LIST) & (v) + _EFI_INT_SIZE_OF (v))
+#define VA_ARG(ap, t) (*(t *) ((ap += _EFI_INT_SIZE_OF (t)) - _EFI_INT_SIZE_OF (t)))
+#define VA_END(ap) (ap = (VA_LIST) 0)
+
+#endif
+
+#endif