reactos/lib/3rdparty/mingw/gccmain.c

   1 /*
   2  * gccmain.c
   3  * This file has no copyright assigned and is placed in the Public Domain.
   4  * This file is a part of the mingw-runtime package.
   5  * No warranty is given; refer to the file DISCLAIMER within the package.
   6  *
   7  * A separate version of __main, __do_global_ctors and __do_global_dtors for
   8  * Mingw32 for use with Cygwin32 b19. Hopefully this object file will only
   9  * be linked if the libgcc.a doesn't include __main, __do_global_dtors and
  10  * __do_global_ctors.
  11  *
  12  */
  13
  14 /* Needed for the atexit prototype. */
  15 #include <stdlib.h>
  16
  17 typedef void (*func_ptr) (void);
  18 extern func_ptr __CTOR_LIST__[];
  19 extern func_ptr __DTOR_LIST__[];
  20
  21 void
  22 __do_global_dtors (void)
  23 {
  24   static func_ptr *p = __DTOR_LIST__ + 1;
  25
  26   /*
  27    * Call each destructor in the destructor list until a null pointer
  28    * is encountered.
  29    */
  30   while (*p)
  31     {
  32       (*(p)) ();
  33       p++;
  34     }
  35 }
  36
  37 void
  38 __do_global_ctors (void)
  39 {
  40   unsigned long nptrs = (unsigned long) __CTOR_LIST__[0];
  41   unsigned i;
  42
  43   /*
  44    * If the first entry in the constructor list is -1 then the list
  45    * is terminated with a null entry. Otherwise the first entry was
  46    * the number of pointers in the list.
  47    */
  48   if (nptrs == -1)
  49     {
  50       for (nptrs = 0; __CTOR_LIST__[nptrs + 1] != 0; nptrs++)
  51         ;
  52     }
  53
  54   /*
  55    * Go through the list backwards calling constructors.
  56    */
  57   for (i = nptrs; i >= 1; i--)
  58     {
  59       __CTOR_LIST__[i] ();
  60     }
  61
  62   /*
  63    * Register the destructors for processing on exit.
  64    */
  65   atexit (__do_global_dtors);
  66 }
  67
  68 static int initialized = 0;
  69
  70 void
  71 __main (void)
  72 {
  73   if (!initialized)
  74     {
  75       initialized = 1;
  76       __do_global_ctors ();
  77     }
  78 }
  79