9b9be7e1f0
Update files from Gregory Nutt to Apache 2.0 license. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
105 lines
3.9 KiB
C
105 lines
3.9 KiB
C
/****************************************************************************
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* include/stdbool.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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