gistfile1.c

/* are we running on a little-endian system? */
static inline int little_endian()
{
    union {
        uint16_t i;
        char c[2];
    } t = { 0x0001 };

    return *t.c == 1;
}

static inline void* swap_bytes(void* s, size_t len)
{
    for(char* b = s,
            * e = b + len - 1;
        b < e;
        b++, e--)
    {
        char t = *b;

        *b = *e;
        *e = t;
    }

    return s;
}

/* big endian to native endian. works in-place */
static inline void* be2ne(void* s, size_t len)
{
    return little_endian() ? swap_bytes(s, len) : s;
}