/* -*- Mode: C; -*-
 * ----------------------------------------------------------------------------
 *     Title: unwind_protect macro
 *   Created: 2020-05-24
 *    Author: Gilbert Baumann <gilbert@bauhh.de>
 * ----------------------------------------------------------------------------
 *  (c) copyright 2020 by Gilbert Baumann
 */

#include <stdio.h>
#include <string.h>

#define unwind_protect(body, cleanup)                   \
  do{                                                   \
    void uwp_cleanup (void *uwp_p)                      \
    {                                                   \
      (void)uwp_p;                                      \
      { cleanup; }                                      \
    }                                                   \
    int uwp_dummy                                       \
      __attribute__ ((__cleanup__ (uwp_cleanup)));      \
    { body; }                                           \
  }while(0)

void foo (void)
{
  unwind_protect
    ({
      printf ("hi, there\n");
      return;
    },
    {
      printf ("cleanup\n");
    });
}

int main (int argc, char **argv)
{
  (void)argc;
  (void)argv;
  foo ();
  return 0;
}