endian.c

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int G_is_little_endian(void)
{
    union
    {
        int testWord;
        char testByte[sizeof(int)];
    } endianTest;

    endianTest.testWord = 1;

    if (endianTest.testByte[0] == 1)
        return 1;               /* true: little endian */

    return 0;                   /* false: big endian */
}