winsup/cygwin/assert.cc

   1 /* assert.cc: Handle the assert macro for WIN32.
   2
   3 This file is part of Cygwin.
   4
   5 This software is a copyrighted work licensed under the terms of the
   6 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   7 details. */
   8
   9 #include "winsup.h"
  10
  11 #include <assert.h>
  12 #include <stdlib.h>
  13
  14 /* This function is called when the assert macro fails.  This will
  15    override the function of the same name in newlib.  */
  16
  17 extern "C" void
  18 __assert (const char *file, int line, const char *failedexpr)
  19 {
  20   __assert_func (file, line, NULL, failedexpr);
  21 }
  22
  23 extern "C" void
  24 __assert_func (const char *file, int line, const char *func,
  25                const char *failedexpr)
  26 {
  27   HANDLE h;
  28
  29   /* If we don't have a console in a Windows program, then bring up a
  30      message box for the assertion failure.  */
  31
  32   h = CreateFile ("CONOUT$", GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE,
  33                   &sec_none_nih, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
  34   if (h == INVALID_HANDLE_VALUE)
  35     {
  36       PWCHAR buf = (PWCHAR) alloca ((100 + strlen (failedexpr))
  37                                     * sizeof (WCHAR));
  38       __small_swprintf (buf,
  39                         L"Failed assertion\n\t%s\nat line %d of file %s%s%s",
  40                         failedexpr, line, file,
  41                         func ? "\nin function " : "", func ? func : "");
  42       MessageBoxW (NULL, buf, NULL, MB_OK | MB_ICONERROR | MB_TASKMODAL);
  43     }
  44   else
  45     {
  46       CloseHandle (h);
  47       small_printf ("assertion \"%s\" failed: file \"%s\", line %d%s%s\n",
  48                     failedexpr, file, line,
  49                     func ? ", function: " : "", func ? func : "");
  50       debug_printf ("assertion \"%s\" failed: file \"%s\", line %d%s%s",
  51                     failedexpr, file, line,
  52                     func ? ", function: " : "", func ? func : "");
  53     }
  54
  55 #ifdef DEBUGGING
  56   try_to_debug ();
  57 #endif
  58   abort ();     // FIXME: Someday this should work.
  59
  60   /* NOTREACHED */
  61 }