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const char *endianness(void) { // Return the system's endianness #ifdef __BYTE_ORDER__ # if (__ORDER_LITTLE_ENDIAN__ == __BYTE_ORDER__) return "ENDIAN_LITTLE"; # elif (__ORDER_BIG_ENDIAN__ == __BYTE_ORDER__) return "ENDIAN_BIG"; # elif (__ORDER_PDP_ENDIAN__ == __BYTE_ORDER__) return "ENDIAN_PDP"; #endif # else union { uint32_t read32_value; uint8_t data[sizeof(uint32_t)]; } number; number.data[0] = 0x00; number.data[1] = 0x01; number.data[2] = 0x02; number.data[3] = 0x03; switch (number.read32_value) { case UINT32_C(0x00010203): return "ENDIAN_BIG"; case UINT32_C(0x03020100): return "ENDIAN_LITTLE"; case UINT32_C(0x02030001): return "ENDIAN_BIG_WORD"; case UINT32_C(0x01000302): return "ENDIAN_LITTLE_WORD"; default: return "ENDIAN_UNKNOWN"; } # endif }Further Reading
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