* fhandler_clipboard.cc: new file

* Makefile.in: include fhandler_clipboard.o in DLL_OFILES list.
* fhandler.h: add FH_CLIPBOARD to the devices enum.
(fhandler_dev_clipboard): new
* path.cc (windows_device_names): add "\\dev\\clipboard"
(get_device_number): check for "clipboard"
* dcrt0.cc: declare a few more functions from winuser.h
* dtable.cc (dtable::build_fhandler): check for FH_CLIPBOARD in
switch().

winsup/cygwin/fhandler_clipboard.cc

@@ -0,0 +1,95 @@
+/* fhandler_dev_clipboard: code to access /dev/clipboard
+
+   Copyright 2000 Red Hat, Inc
+
+   Written by Charles Wilson (cwilson@ece.gatech.edu)
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+#include "winsup.h"
+#include <stdio.h>
+#include <errno.h>
+#include "cygerrno.h"
+#include "fhandler.h"
+#include <windows.h>
+#include <wingdi.h>
+#include <winuser.h>
+
+static BOOL clipboard_eof; // NOT THREAD-SAFE
+
+fhandler_dev_clipboard::fhandler_dev_clipboard (const char *name)
+  : fhandler_base (FH_CLIPBOARD, name)
+{
+  set_cb (sizeof *this);
+  clipboard_eof = false;
+}
+
+int
+fhandler_dev_clipboard::open (const char *, int flags, mode_t)
+{
+  set_flags (flags);
+  clipboard_eof = false;
+  return 1;
+}
+
+int
+fhandler_dev_clipboard::write (const void *, size_t len)
+{
+  return len;
+}
+
+int
+fhandler_dev_clipboard::read (void *ptr, size_t len)
+{
+  HGLOBAL hglb;
+  LPSTR lpstr;
+  int ret;
+ 
+  if (!clipboard_eof)
+    {
+      OpenClipboard(0);
+      hglb = GetClipboardData(CF_TEXT);
+      lpstr = (LPSTR) GlobalLock(hglb);
+      if (len < sizeof (lpstr))
+        {
+          set_errno (EINVAL);
+          GlobalUnlock (hglb);
+          CloseClipboard ();
+          return -1;
+        }
+
+      ret = snprintf((char *) ptr, len, "%s", lpstr);
+      GlobalUnlock(hglb);
+      CloseClipboard();
+      set_errno (0);
+      clipboard_eof = true;
+      return ret;
+    }
+  else
+    {
+      return 0;
+    }
+}
+
+off_t
+fhandler_dev_clipboard::lseek (off_t offset, int whence)
+{
+  return 0;
+}
+
+int
+fhandler_dev_clipboard::close (void)
+{
+  clipboard_eof = false;
+  return 0;
+}
+
+void
+fhandler_dev_clipboard::dump ()
+{
+  paranoid_printf("here, fhandler_dev_clipboard");
+}