#pragma once

#define SEGSIZE 512
#define RRQ 01
#define WRQ 02
#define DATA 03
#define ACK 04
#define ERROR 05
struct tftphdr {
    short th_opcode;
    union {
        unsigned short tu_block;
        short tu_code;
        char tu_stuff[1];
    } th_u;
    char th_data[1];
};
#define th_block th_u.tu_block
#define th_code th_u.tu_code
#define th_stuff th_u.tu_stuff
#define th_msg th_data
#define EUNDEF 0
#define ENOTFOUND 1
#define EACCESS 2
#define ENOSPACE 3
#define EBADOP 4
#define EBADID 5
#define EEXISTS 6
#define ENOUSER 7