/*++ | |
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 |