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Diffstat (limited to 'nuttx/include/stdbool.h')
-rw-r--r-- | nuttx/include/stdbool.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/nuttx/include/stdbool.h b/nuttx/include/stdbool.h new file mode 100644 index 000000000..f11219912 --- /dev/null +++ b/nuttx/include/stdbool.h @@ -0,0 +1,89 @@ +/**************************************************************************** + * 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> + +#ifdef CONFIG_ARCH_STDBOOL_H +# include <arch/stdbool.h> +#else +# 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. + */ + +#define bool _Bool8 +#define true 1 +#define false 0 + +#define __bool_true_false_are_defined 1 + +/**************************************************************************** + * 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. + */ + +typedef uint8_t _Bool8; + +#endif /* CONFIG_ARCH_STDBOOL_H */ +#endif /* __INCLUDE_STDBOOL_H */ |