120 lines
4.7 KiB
C
120 lines
4.7 KiB
C
/****************************************************************************
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* include/stdbool.h
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*
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* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_STDBOOL_H
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#define __INCLUDE_STDBOOL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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/* If CONFIG_ARCH_STDBOOL_H is set, then the architecture will provide its
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* own stdbool.h file. In this case, this header file will simply re-direct
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* to the architecture-specfic stdbool.h header file.
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*/
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#ifdef CONFIG_ARCH_STDBOOL_H
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# include <arch/stdbool.h>
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/* NuttX will insist that the sizeof(bool) is 8-bits. The sizeof of _Bool
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* used by any specific compiler is implementation specific: It can vary from
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* compiler-to-compiler and even vary between different versions of the same
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* compiler. Compilers seems to be converging to sizeof(_Bool) == 1. If that
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* is true for your compiler, you should define CONFIG_C99_BOOL8 in your
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* NuttX configuration for better standards compatibility.
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*
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* CONFIG_C99_BOOL8 - Means (1) your C++ compiler has sizeof(_Bool) == 8,
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* (2) your C compiler supports the C99 _Bool intrinsic type, and (3) that
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* the C99 _Bool type also has size 1.
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*/
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#else
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/* nuttx/compiler.h may also define or undefine CONFIG_C99_BOOL8 */
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# include <nuttx/compiler.h>
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# include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* bool, true, and false must be provided as macros so that they can be
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* redefined by the application if necessary.
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*
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* NOTE: Under C99 'bool' is required to be defined to be the intrinsic type
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* _Bool. However, in this NuttX context, we need backward compatibility
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* to pre-C99 standards where _Bool is not an intrinsic type. Hence, we
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* use _Bool8 as the underlying type (unless CONFIG_C99_BOOL8 is defined)
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*/
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#ifndef __cplusplus
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#ifdef CONFIG_C99_BOOL8
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# define bool _Bool
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#else
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# define bool _Bool8
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#endif
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#define true (bool)1
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#define false (bool)0
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#define __bool_true_false_are_defined 1
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#endif /* __cplusplus */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* A byte is the smallest address memory element (at least in architectures
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* that do not support bit banding). The requirement is only that type _Bool
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* be large enough to hold the values 0 and 1. We select uint8_t to minimize
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* the RAM footprint of the executable.
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*
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* NOTE: We can't actually define the type _Bool here. Under C99 _Bool is
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* an intrinsic type and cannot be the target of a typedef. However, in this
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* NuttX context, we also need backward compatibility to pre-C99 standards
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* where _Bool is not an intrinsic type. We work around this by using _Bool8
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* as the underlying type.
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*/
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#ifndef CONFIG_C99_BOOL8
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typedef uint8_t _Bool8;
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#endif
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#endif /* CONFIG_ARCH_STDBOOL_H */
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#endif /* __INCLUDE_STDBOOL_H */
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