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120 lines
4.8 KiB
120 lines
4.8 KiB
/**************************************************************************** |
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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 archecture will provide its own |
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* stdbool.h file. In this case, this header file will simply re-direct to |
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* the architecture-specfiic 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 NuttX |
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* 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 (2) 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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#if !defined(__cplusplus) || !defined(CONFIG_C99_BOOL8) |
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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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#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 1 |
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#define false 0 |
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#define __bool_true_false_are_defined 1 |
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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 /* __cplusplus && CONFIG_C99_BOOL8 */ |
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#endif /* CONFIG_ARCH_STDBOOL_H */ |
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#endif /* __INCLUDE_STDBOOL_H */
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