__STDC_ENDIAN_LITTLE__, __STDC_ENDIAN_BIG__, __STDC_ENDIAN_NATIVE__

#define __STDC_ENDIAN_LITTLE__ /* implementation-defined */

#define __STDC_ENDIAN_BIG__    /* implementation-defined */

#define __STDC_ENDIAN_NATIVE__ /* implementation-defined */

Indicates the endianness of all scalar types:

• If all scalar types are little-endian, __STDC_ENDIAN_NATIVE__ equals __STDC_ENDIAN_LITTLE__.
• If all scalar types are big-endian, __STDC_ENDIAN_NATIVE__ equals __STDC_ENDIAN_BIG__.
• If the platform uses neither little-endian nor big-endian, __STDC_ENDIAN_NATIVE__ equals neither __STDC_ENDIAN_BIG__ nor __STDC_ENDIAN_LITTLE__.
• The values of the integer constant expressions for __STDC_ENDIAN_BIG__ and __STDC_ENDIAN_LITTLE__ are not equal.

Example

#include <stdbit.h>
#include <stdio.h>

int main()
{
    switch(__STDC_ENDIAN_NATIVE__)
    {
        case __STDC_ENDIAN_LITTLE__:
            printf("__STDC_ENDIAN_LITTLE__\n");
            break;
        case __STDC_ENDIAN_BIG__:
            printf("__STDC_ENDIAN_BIG__\n");
            break;
        default:
            printf("mixed-endian\n");
    }
    return __STDC_ENDIAN_NATIVE__;
}

mixed-endian

See also