source: trunk/third/xntp/util/byteorder.c @ 16192

/*
 * This works on:
 *   Crays
 *   Conven
 *   sparc's
 *   Dec mip machines
 *   Dec alpha machines
 *   RS6000
 *   SGI's
 */

#include <stdio.h>

int
main(
        int argc,
        char *argv[]
        )
{
        int i;
        int big;
        union {
                unsigned long l;
                char c[sizeof(long)];
        } u;

#if defined(LONG8)
        u.l = (((long)0x08070605) << 32) | (long)0x04030201;
#else
        u.l = 0x04030201;
#endif
        if (sizeof(long) > 4) {
                if (u.c[0] == 0x08) big = 1;
                else                big = 0;
        } else {
                if (u.c[0] == 0x04) big = 1;
                else                big = 0;
        }
        for (i=0; i< sizeof(long); i++) {
                if (big == 1 && (u.c[i] == (sizeof(long) - i))) { 
                        continue; 
                } else if (big == 0 && (u.c[i] == (i+1))) {
                        continue;
                } else {
                        big = -1;
                        break;
                }
        }

        if (big == 1) {
                printf("XNTP_BIG_ENDIAN\n");
        } else if (big == 0) {
                printf("XNTP_LITTLE_ENDIAN\n");
        }
        exit(0);
}