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#include <windows.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>

#ifdef __CYGWIN__
/* For read() and write() */
#include <unistd.h>
/* Cygwin does not prototype __argc and __argv in stdlib.h */
extern int __argc;
extern char** __argv;
#endif

int _stdcall
WinMain (struct HINSTANCE__ *hInstance,
        struct HINSTANCE__ *hPrevInstance,
        char *lpszCmdLine,
        int   nCmdShow)
{
  char buf[100];

  if (__argc >= 2 && strcmp (__argv[1], "nop") == 0)
    {
      sprintf (buf, "spawn-test-win32-gui: argv[0]=\"%s\"", __argv[0]);
      MessageBox (NULL, buf, lpszCmdLine, MB_ICONINFORMATION|MB_SYSTEMMODAL);
    }
  else if (__argc <= 2)
    {
      MessageBox (NULL, "spawn-test-win32-gui: Will write to stdout",
                  lpszCmdLine, MB_ICONINFORMATION|MB_SYSTEMMODAL);
      
      printf ("This is stdout\n");
      fflush (stdout);
      
      MessageBox (NULL, "spawn-test-win32-gui: Will write to stderr",
                  lpszCmdLine, MB_ICONINFORMATION|MB_SYSTEMMODAL);
      
      fprintf (stderr, "This is stderr\n");
      fflush (stderr);
    }
  else if (__argc == 4 && strcmp (__argv[1], "pipes") == 0)
    {
      int infd = atoi (__argv[2]);
      int outfd = atoi (__argv[3]);
      int k, n;

      if (infd < 0 || outfd < 0)
        {
          MessageBox (NULL, "spawn-test-win32-gui: illegal fds on command line",
                      lpszCmdLine, MB_ICONERROR|MB_SYSTEMMODAL);
          exit (1);
        }

      MessageBox (NULL, "spawn-test-win32-gui: Will write to parent",
                  lpszCmdLine, MB_ICONINFORMATION|MB_SYSTEMMODAL);

      n = strlen ("Hello there");
      if (write (outfd, &n, sizeof (n)) == -1 ||
          write (outfd, "Hello there", n) == -1)
        {
          sprintf (buf, "spawn-test-win32-gui: Write: %s", strerror (errno));
          MessageBox (NULL, buf, lpszCmdLine, MB_ICONERROR|MB_SYSTEMMODAL);
          exit (1);
        }

      MessageBox (NULL, "spawn-test-win32-gui: Will read from parent",
                  lpszCmdLine, MB_ICONINFORMATION|MB_SYSTEMMODAL);

      if ((k = read (infd, &n, sizeof (n))) != sizeof (n))
        {
          sprintf (buf, "spawn-test-win32-gui: Got only %d bytes, wanted %d",
                   k, sizeof (n));
          MessageBox (NULL, buf, lpszCmdLine, MB_ICONERROR|MB_SYSTEMMODAL);
          exit (1);
        }

      sprintf (buf, "spawn-test-win32-gui: Parent says %d bytes to read", n);
      MessageBox (NULL, buf, lpszCmdLine, MB_ICONINFORMATION|MB_SYSTEMMODAL);

      if ((k = read (infd, buf, n)) != n)
        {
          if (k == -1)
            sprintf (buf, "spawn-test-win32-gui: Read: %s", strerror (errno));
          else
            sprintf (buf, "spawn-test-win32-gui: Got only %d bytes", k);
          MessageBox (NULL, buf, lpszCmdLine, MB_ICONERROR|MB_SYSTEMMODAL);
          exit (1);
        }

      MessageBox (NULL, "spawn-test-win32-gui: Will write more to parent",
                  lpszCmdLine, MB_ICONINFORMATION|MB_SYSTEMMODAL);

      n = strlen ("See ya");
      if (write (outfd, &n, sizeof (n)) == -1 ||
          write (outfd, "See ya", n) == -1)
        {
          sprintf (buf, "spawn-test-win32-gui: Write: %s", strerror (errno));
          MessageBox (NULL, buf, lpszCmdLine, MB_ICONERROR|MB_SYSTEMMODAL);
          exit (1);
        }
    }

  Sleep (2000);
  
  MessageBox (NULL, "spawn-test-win32-gui: Done, exiting.",
              lpszCmdLine, MB_ICONINFORMATION|MB_SYSTEMMODAL);

  return 0;
}