__STDC_ENDIAN_LITTLE__, __STDC_ENDIAN_BIG__, __STDC_ENDIAN_NATIVE__

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.

[edit] 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

[edit] See also

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