mhd_check.h

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/*
  This file is part of libmicrohttpd
  Copyright (C) 2026 Christian Grothoff
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library.
  If not, see <http://www.gnu.org/licenses/>.
*/

 
#ifndef MHD_CHECK_H
#define MHD_CHECK_H 1
 
#include "mhd_options.h"

#if defined(__GNUC__) || defined(__clang__)
#  define MHD_CHECK_FAILED_(expr) (__builtin_expect (! (expr), 0))
#else  /* ! __GNUC__ */
#  define MHD_CHECK_FAILED_(expr) (! (expr))
#endif /* ! __GNUC__ */

#ifdef HAVE_MESSAGES
#  define MHD_CHECK_LOG_(daemon,expr_str) \
        MHD_DLOG (daemon, \
                  _ ("Internal invariant violated at %s:%u: (%s). " \
                     "Failing the connection.\n"), \
                  __FILE__, \
                  (unsigned int) __LINE__, \
                  expr_str)
#else  /* ! HAVE_MESSAGES */
#  define MHD_CHECK_LOG_(daemon,expr_str) ((void) 0)
#endif /* ! HAVE_MESSAGES */
 

#define MHD_CHECK_(daemon,expr,fail_stmt) \
        do { \
          if (MHD_CHECK_FAILED_ (expr)) \
          { \
            MHD_CHECK_LOG_ (daemon, #expr); \
            fail_stmt; \
          } \
        } while (0)
 

#define MHD_CHECK_RET_(expr,retval) \
        do { \
          if (MHD_CHECK_FAILED_ (expr)) \
            return retval; \
        } while (0)
 

#define MHD_CHECK_CONN_CLOSE_RET_(c,expr,retval) \
        MHD_CHECK_ ((c)->daemon, \
                    expr, \
                    { \
                      connection_close_error ((c), \
                                              NULL); \
                      return retval; \
                    })
 

#define MHD_CHECK_CONN_CLOSE_RET_VOID_(c,expr) \
        MHD_CHECK_ ((c)->daemon, \
                    expr, \
                    { \
                      connection_close_error ((c), \
                                              NULL); \
                      return; \
                    })
 

#define MHD_CHECK_CONN_REPLY_RET_(c,expr,code,msg,retval) \
        MHD_CHECK_ ((c)->daemon, \
                    expr, \
                    { \
                      transmit_error_response_static ((c), \
                                                      (code), \
                                                      msg); \
                      return retval; \
                    })
 
#endif /* ! MHD_CHECK_H */