text: #ifndef __CARES_RULES_H
  #define __CARES_RULES_H
  
  
  /* Copyright (C) 2009 by Daniel Stenberg et al
   *
   * Permission to use, copy, modify, and distribute this software and its
   * documentation for any purpose and without fee is hereby granted, provided
   * that the above copyright notice appear in all copies and that both that
   * copyright notice and this permission notice appear in supporting
   * documentation, and that the name of M.I.T. not be used in advertising or
   * publicity pertaining to distribution of the software without specific,
   * written prior permission.  M.I.T. makes no representations about the
   * suitability of this software for any purpose.  It is provided "as is"
   * without express or implied warranty.
   */
  
  /* ================================================================ */
  /*                    COMPILE TIME SANITY CHECKS                    */
  /* ================================================================ */
  
  /*
   * NOTE 1:
   * -------
   *
   * All checks done in this file are intentionally placed in a public
   * header file which is pulled by ares.h when an application is
   * being built using an already built c-ares library. Additionally
   * this file is also included and used when building the library.
   *
   * If compilation fails on this file it is certainly sure that the
   * problem is elsewhere. It could be a problem in the ares_build.h
   * header file, or simply that you are using different compilation
   * settings than those used to build the library.
   *
   * Nothing in this file is intended to be modified or adjusted by the
   * c-ares library user nor by the c-ares library builder.
   *
   * Do not deactivate any check, these are done to make sure that the
   * library is properly built and used.
   *
   * You can find further help on the c-ares development mailing list:
   * http://cool.haxx.se/mailman/listinfo/c-ares/
   *
   * NOTE 2
   * ------
   *
   * Some of the following compile time checks are based on the fact
   * that the dimension of a constant array can not be a negative one.
   * In this way if the compile time verification fails, the compilation
   * will fail issuing an error. The error description wording is compiler
   * dependent but it will be quite similar to one of the following:
   *
   *   "negative subscript or subscript is too large"
   *   "array must have at least one element"
   *   "-1 is an illegal array size"
   *   "size of array is negative"
   *
   * If you are building an application which tries to use an already
   * built c-ares library and you are getting this kind of errors on
   * this file, it is a clear indication that there is a mismatch between
   * how the library was built and how you are trying to use it for your
   * application. Your already compiled or binary library provider is the
   * only one who can give you the details you need to properly use it.
   */
  
  /*
   * Verify that some macros are actually defined.
   */
  
  #ifndef CARES_TYPEOF_ARES_SOCKLEN_T
  #  error "CARES_TYPEOF_ARES_SOCKLEN_T definition is missing!"
     Error Compilation_aborted_CARES_TYPEOF_ARES_SOCKLEN_T_is_missing
  #endif
  
  #ifndef CARES_SIZEOF_ARES_SOCKLEN_T
  #  error "CARES_SIZEOF_ARES_SOCKLEN_T definition is missing!"
     Error Compilation_aborted_CARES_SIZEOF_ARES_SOCKLEN_T_is_missing
  #endif
  
  /*
   * Macros private to this header file.
   */
  
  #define CareschkszEQ(t, s) sizeof(t) == s ? 1 : -1
  
  #define CareschkszGE(t1, t2) sizeof(t1) >= sizeof(t2) ? 1 : -1
  
  /*
   * Verify that the size previously defined and expected for
   * ares_socklen_t is actually the the same as the one reported
   * by sizeof() at compile time.
   */
  
  typedef char
    __cares_rule_02__
      [CareschkszEQ(ares_socklen_t, CARES_SIZEOF_ARES_SOCKLEN_T)];
  
  /*
   * Verify at compile time that the size of ares_socklen_t as reported
   * by sizeof() is greater or equal than the one reported for int for
   * the current compilation.
   */
  
  typedef char
    __cares_rule_03__
      [CareschkszGE(ares_socklen_t, int)];
  
  /* ================================================================ */
  /*          EXTERNALLY AND INTERNALLY VISIBLE DEFINITIONS           */
  /* ================================================================ */
  
  /*
   * Get rid of macros private to this header file.
   */
  
  #undef CareschkszEQ
  #undef CareschkszGE
  
  /*
   * Get rid of macros not intended to exist beyond this point.
   */
  
  #undef CARES_PULL_WS2TCPIP_H
  #undef CARES_PULL_SYS_TYPES_H
  #undef CARES_PULL_SYS_SOCKET_H
  
  #undef CARES_TYPEOF_ARES_SOCKLEN_T
  
  #endif /* __CARES_RULES_H */
  