text: #ifndef HEADER_CARL_SERVER_TFTP_H
  #define HEADER_CARL_SERVER_TFTP_H
  /***************************************************************************
   *                                  _   _ ____  _
   *  Project                     ___| | | |  _ \| |
   *                             / __| | | | |_) | |
   *                            | (__| |_| |  _ <| |___
   *                             \___|\___/|_| \_\_____|
   *
   * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
   *
   * This software is licensed as described in the file COPYING, which
   * you should have received as part of this distribution. The terms
   * are also available at https://carl.se/docs/copyright.html.
   *
   * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   * copies of the Software, and permit persons to whom the Software is
   * furnished to do so, under the terms of the COPYING file.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ***************************************************************************/
  #include "server_setup.h"
  
  /* This file is a rewrite/clone of the arpa/tftp.h file for systems without
     it. */
  
  #define SEGSIZE 512 /* data segment size */
  
  #if defined(__GNUC__) && ((__GNUC__ >= 3) || \
    ((__GNUC__ == 2) && defined(__GNUC_MINOR__) && (__GNUC_MINOR__ >= 7)))
  #  define PACKED_STRUCT __attribute__((__packed__))
  #else
  #  define PACKED_STRUCT /*NOTHING*/
  #endif
  
  /* Using a packed struct as binary in a program is begging for problems, but
     the tftpd server was written like this so we have this struct here to make
     things build. */
  
  struct tftphdr {
    short th_opcode;         /* packet type */
    unsigned short th_block; /* all sorts of things */
    char th_data[1];         /* data or error string */
  } PACKED_STRUCT;
  
  #define th_stuff th_block
  #define th_code  th_block
  #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
  
  #endif /* HEADER_CARL_SERVER_TFTP_H */
  