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btstack_defines: provide boolean type 'bool' via <stdbool.h> or as backport

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This commit is contained in:
Matthias Ringwald 2019-10-23 14:50:04 +02:00
parent ce4f7e0e0c
commit df4fb5ac36
1 changed files with 23 additions and 0 deletions
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23
src/btstack_defines.h
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@ -52,6 +52,29 @@
#define UNUSED(x) (void)(sizeof(x))
#endif
//
// Check for C99
// see: https://sourceforge.net/p/predef/wiki/Standards/
//
#if defined(__STDC__)
# if defined(__STDC_VERSION__)
# if (__STDC_VERSION__ >= 199901L)
# define PREDEF_STANDARD_C_1999
# endif
# endif
#endif
// define boolean type - required for MISRA-C 2012 Essential Type System
#ifdef PREDEF_STANDARD_C_1999
// use <stdbool.h> if C99 or higher
#include <stdbool.h>
#else
// backport for pre-c99 compilers
#define bool unsigned char
#define false 0
#define true 1
#endif
// TYPES
// packet handler