reactos/lib/crtdll/misc/gccmain.c

   1 /*
   2  * gccmain.c
   3  *
   4  * A separate version of __main, __do_global_ctors and __do_global_dtors for
   5  * Mingw32 for use with Cygwin32 b19. Hopefully this object file will only
   6  * be linked if the libgcc.a doesn't include __main, __do_global_dtors and
   7  * __do_global_ctors.
   8  *
   9  * This file is part of the Mingw32 package.
  10  *
  11  * Contributors:
  12  *  Code supplied by Stan Cox <scox@cygnus.com>
  13  *
  14  * $Revision: 1.3 $
  15  * $Author$
  16  * $Date$
  17  *
  18  */
  19
  20 /* Needed for the atexit prototype. */
  21 #include <msvcrt/stdlib.h>
  22
  23
  24 typedef void (*func_ptr) (void);
  25 extern func_ptr __CTOR_LIST__[];
  26 extern func_ptr __DTOR_LIST__[];
  27
  28 void __do_global_dtors(void)
  29 {
  30         static func_ptr* p = __DTOR_LIST__ + 1;
  31
  32         /*
  33          * Call each destructor in the destructor list until a null pointer
  34          * is encountered.
  35          */
  36         while (*p)
  37         {
  38                 (*(p)) ();
  39                 p++;
  40         }
  41 }
  42
  43 void __do_global_ctors(void)
  44 {
  45         unsigned long nptrs = (unsigned long)__CTOR_LIST__[0];
  46         unsigned i;
  47
  48         /*
  49          * If the first entry in the constructor list is -1 then the list
  50          * is terminated with a null entry. Otherwise the first entry was
  51          * the number of pointers in the list.
  52          */
  53         if (nptrs == -1) {
  54                 for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++)
  55                         ;
  56         }
  57
  58         /*
  59          * Go through the list backwards calling constructors.
  60          */
  61         for (i = nptrs; i >= 1; i--) {
  62                 __CTOR_LIST__[i] ();
  63         }
  64
  65         /*
  66          * Register the destructors for processing on exit.
  67          */
  68         atexit(__do_global_dtors);
  69 }
  70
  71 static int initialized = 0;
  72
  73 void __main(void)
  74 {
  75         if (!initialized) {
  76                 initialized = 1;
  77                 __do_global_ctors ();
  78         }
  79 }
  80