Runtime Endianness Verdict

ISO C. Implement int byte_order(void) — place 1 in an unsigned int, inspect its first byte, return 1 for little-endian, 0 for big-endian. (Other orders are vanishingly rare; the probe may legitimately report either of the two it can distinguish.) Implement const char *order_name(void) returning the fixed string 'little' or 'big' via byte_order().