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Replace traditional `#ifndef`/`#define`/`#endif` include guards with
`#pragma` once.
`#pragma once` is a widely supported preprocessor directive that
prevents header files from being included multiple times. It is
supported by all toolchains used to build edk2: GCC, Clang/LLVM, and
MSVC.
Compared to macro-based include guards, `#pragma once`:
- Eliminates the risk of macro name collisions or copy/paste errors
where two headers inadvertently use the same guard macro.
- Eliminate inconsistency in the way include guard macros are named
(e.g., some files use `__FILE_H__`, others use `FILE_H_`, etc.).
- Reduces boilerplate (three lines replaced by one).
- Avoids polluting the macro namespace with guard symbols.
- Can improve build times as the preprocessor can skip re-opening the
file entirely, rather than re-reading it to find the matching
`#endif` ("multiple-include optimization").
- Note that some compilers may already optimize traditional include
guards, by recognzining the idiomatic pattern.
This change is made acknowledging that overall portability of the
code will technically be reduced, as `#pragma once` is not part of the
C/C++ standards.
However, this is considered acceptable given:
1. edk2 already defines a subset of supported compilers in
BaseTools/Conf/tools_def.template, all of which have supported
`#pragma once` for over two decades.
2. There have been concerns raised to the project about inconsistent
include guard naming and potential macro collisions.
Approximate compiler support dates:
- MSVC: Supported since Visual C++ 4.2 (1996)
- GCC: Supported since 3.4 (2004)
(http://gnu.ist.utl.pt/software/gcc/gcc-3.4/changes.html)
- Clang (LLVM based): Since initial release in 2007
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/** @file
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Function definitions for shell simple text in and out on top of file handles.
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(C) Copyright 2013 Hewlett-Packard Development Company, L.P.<BR>
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Copyright (c) 2010 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#pragma once
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/**
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Function to create a EFI_SIMPLE_TEXT_INPUT_PROTOCOL on top of a
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SHELL_FILE_HANDLE to support redirecting input from a file.
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@param[in] FileHandleToUse The pointer to the SHELL_FILE_HANDLE to use.
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@param[in] HandleLocation The pointer of a location to copy handle with protocol to.
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@retval NULL There was insufficient memory available.
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@return A pointer to the allocated protocol structure;
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**/
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EFI_SIMPLE_TEXT_INPUT_PROTOCOL *
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CreateSimpleTextInOnFile (
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IN SHELL_FILE_HANDLE FileHandleToUse,
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IN EFI_HANDLE *HandleLocation
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);
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/**
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Function to close a EFI_SIMPLE_TEXT_INPUT_PROTOCOL on top of a
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SHELL_FILE_HANDLE to support redirecting input from a file.
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@param[in] SimpleTextIn The pointer to the SimpleTextIn to close.
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@retval EFI_SUCCESS The object was closed.
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**/
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EFI_STATUS
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CloseSimpleTextInOnFile (
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IN EFI_SIMPLE_TEXT_INPUT_PROTOCOL *SimpleTextIn
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);
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/**
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Function to create a EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL on top of a
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SHELL_FILE_HANDLE to support redirecting output from a file.
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@param[in] FileHandleToUse The pointer to the SHELL_FILE_HANDLE to use.
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@param[in] HandleLocation The pointer of a location to copy handle with protocol to.
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@param[in] OriginalProtocol The pointer to the original output protocol for pass thru of functions.
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@retval NULL There was insufficient memory available.
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@return A pointer to the allocated protocol structure;
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**/
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EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *
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CreateSimpleTextOutOnFile (
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IN SHELL_FILE_HANDLE FileHandleToUse,
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IN EFI_HANDLE *HandleLocation,
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IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *OriginalProtocol
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);
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/**
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Function to close a EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL on top of a
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SHELL_FILE_HANDLE to support redirecting output from a file.
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@param[in] SimpleTextOut The pointer to the SimpleTextOUT to close.
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@retval EFI_SUCCESS The object was closed.
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**/
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EFI_STATUS
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CloseSimpleTextOutOnFile (
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IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *SimpleTextOut
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);
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