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