common.h

#ifndef __cplusplus // disable clang complains
#include <stdint.h> // abi: uint32_t, uint8_t
#include <stdlib.h> // assert: exit
#include <stdio.h>  // assert: fprintf

#ifdef TRUE
#error "TRUE already defined"
#else
#define TRUE (1==1)
#endif

#ifdef FALSE
#error "False already defined"
#else
#define FALSE (!TRUE)
#endif

// existence of typedefs can not be checked within macros
//#define _TYPEDEF_
typedef enum { false = FALSE, true } bool;
//#endif

#ifdef static_assert
#error "static_assert already defined"
#else
#define static_assert _Static_assert // since C11
#endif

// potential necessity: custom printf and exit for the platform
// unfortunately we dont have __COLUMN__ as macro
#define assert(a) if( !( a ) )                            \
{                                                         \
    fprintf( stderr, "%s:%d assertion failure of (%s)\n", \
                             __FILE__, __LINE__, #a );    \
    exit( 1 );                                            \
}                                                         \
static_assert(true, "")

#ifdef IS_SIGNED
#error "IS_SIGNED already defined"
#else
#define IS_SIGNED(Type) (((Type)-1) < 0)
#endif

static_assert(IS_SIGNED(char),   "err: char is unsigned");
static_assert(sizeof(char) == 1, "err: char not 1 byte");
static_assert(sizeof(unsigned char) == 1, "err: char not 1 byte");
static_assert(sizeof(signed char) == 1, "err: char not 1 byte");
static_assert(sizeof(uint8_t) == 1,  "err: uint8_t not 1 byte");
static_assert(sizeof(uint16_t) == 2, "err: uint16_t not 2 byte");
static_assert(sizeof(uint32_t) == 4, "err: uint32_t not 4 byte");
static_assert(sizeof(uint64_t) == 8, "err: uint64_t not 8 byte");
static_assert(sizeof(int8_t) == 1,  "err: int8_t not 1 byte");
static_assert(sizeof(int16_t) == 2, "err: int16_t not 2 byte");
static_assert(sizeof(int32_t) == 4, "err: int32_t not 4 byte");
static_assert(sizeof(int64_t) == 8, "err: int64_t not 8 byte");
//static_assert(sizeof(uint128_t) == 16, "err: uint128_t not 16 byte"); poorly supported
//static_assert(sizeof(int128_t) == 16, "err: int128_t not 16 byte"); poorly supported
#endif // __cplusplus