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