85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/****************************************************************************
|
|
* include/stdbool.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#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>
|
|
|
|
#else
|
|
|
|
/* 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_BOOL in your
|
|
* NuttX configuration for better standards compatibility.
|
|
*
|
|
* CONFIG_C99_BOOL - 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.
|
|
*/
|
|
|
|
/* nuttx/compiler.h define or undefine CONFIG_C99_BOOL */
|
|
|
|
# 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 uint8_t as the underlying type (unless CONFIG_C99_BOOL is defined)
|
|
*/
|
|
|
|
# ifndef __cplusplus
|
|
# ifdef CONFIG_C99_BOOL
|
|
# define bool _Bool
|
|
# else
|
|
# define bool uint8_t
|
|
# endif
|
|
|
|
# define true (bool)1
|
|
# define false (bool)0
|
|
|
|
# define __bool_true_false_are_defined 1
|
|
# endif /* __cplusplus */
|
|
|
|
# endif /* CONFIG_ARCH_STDBOOL_H */
|
|
#endif /* __INCLUDE_STDBOOL_H */
|