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Message-ID: <398783D9.E25355B6@ece.gatech.edu>
Date: Tue, 01 Aug 2000 22:13:45 -0400
From: Charles Wilson <cwilson AT ece DOT gatech DOT edu>
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To: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: Clipboard from Cygwin?
References: <nZFGdDAMA1h5IwZi AT almide DOT demon DOT co DOT uk> <003b01bffc0a$6da278a0$3c5350d8 AT guinness> <200008012327 DOT TAA29658 AT envy DOT delorie DOT com>
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DJ Delorie wrote:
> 
> > Or better yet, how about implementing a /dev/clipboard like uwin has?
> 
> cygwin includes a tutorial on adding device handlers to cygwin1.dll.
> Why not give it a try?  I'd hate to think I'd wasted all that effort
> writing a tutorial that nobody uses...
> 
> http://sources.redhat.com/cygwin/snapshots/winsup-src-20000725.tar.bz2/winsup/doc/fhandler-tut.txt

Cool. Here's a first attempt -- but I can't get it to build. (Errors
building cygwin, but apparently because I don't know how -- I'm not
getting errors in the code affected by this patch, but elsewhere:
missing stdarg.h & stddef.h files...). 

Anyway, below there's a patch (that affects pre-existing files in CVS)
and a new file: fhandler_clipboard.cc. It should do read-only clipboard
access right now. gzip+uuencode versions pasted below.

--Chuck


----------------------snip-----------------------------
/* fhandler_dev_handler.cc: code to access /dev/zero

   Copyright 2000 Cygnus Solutions.

   Written by DJ Delorie (dj AT cygnus DOT com)

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 <errno.h>
#include "winsup.h"
#include <windows.h>

fhandler_dev_clipboard::fhandler_dev_clipboard (const char *name)
  : fhandler_base (FH_CLIPBOARD, name)
{
  set_cb (sizeof *this);
}

int
fhandler_dev_clipboard::open (const char *, int flags, mode_t)
{
  set_flags (flags);
  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;

  OpenClipboard(0);
  hglb = GetClipboardData(CF_TEXT);
  lpstr = (LPSTR) GlobalLock(hglb);

  len = snprintf((char *) ptr, len, "%s", lpstr);
  GlobalUnlock(hglb);
  CloseClipboard();
  return len;
}

off_t
fhandler_dev_clipboard::lseek (off_t, int)
{
  return 0;
}

int
fhandler_dev_clipboard::close (void)
{
  return 0;
}

void
fhandler_dev_clipboard::dump ()
{
  paranoid_printf("here, fhandler_dev_clipboard");
}
-------------------------snip-----------------------

---------------------clip.patch--------------------------
Index: winsup/cygwin/Makefile.in
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/Makefile.in,v
retrieving revision 1.25
diff -u -r1.25 Makefile.in
--- Makefile.in 2000/07/10 15:30:04     1.25
+++ Makefile.in 2000/08/02 01:18:22
@@ -122,12 +122,13 @@
        environ.o  errno.o exceptions.o exec.o external.o fcntl.o
fhandler.o \
        fhandler_console.o fhandler_floppy.o fhandler_random.o
fhandler_raw.o
\
        fhandler_serial.o fhandler_tape.o fhandler_termios.o
fhandler_tty.o \
-       fhandler_windows.o fhandler_zero.o fork.o glob.o grp.o heap.o
hinfo.o
\
-       init.o ioctl.o localtime.o malloc.o mmap.o net.o ntea.o passwd.o
\
-       path.o pinfo.o pipe.o poll.o regexp.o regerror.o regsub.o
registry.o \
-       resource.o scandir.o security.o select.o shared.o signal.o
sigproc.o \
-       smallprint.o spawn.o strace.o strsep.o sync.o syscalls.o
sysconf.o \
-       syslog.o termios.o times.o tty.o uinfo.o uname.o wait.o window.o
\
+       fhandler_windows.o fhandler_zero.o fhandler_clipboard.o fork.o
glob.o
\
+       grp.o heap.o hinfo.o init.o ioctl.o localtime.o malloc.o mmap.o
net.o
\
+       ntea.o passwd.o path.o pinfo.o pipe.o poll.o regexp.o regerror.o
\
+       regsub.o registry.o resource.o scandir.o security.o select.o
shared.o
\
+       signal.o sigproc.o smallprint.o spawn.o strace.o strsep.o sync.o
\
+       syscalls.o sysconf.o syslog.o termios.o times.o tty.o uinfo.o
uname.o
\
+       wait.o window.o \
        $(EXTRA_DLL_OFILES) $(EXTRA_OFILES) $(MT_SAFE_OBJECTS)
 
 GMON_OFILES:= gmon.o mcount.o profil.o
@@ -309,6 +310,7 @@
 fhandler_floppy.o: $(WINSUP_H)
 fhandler_tape.o: $(WINSUP_H)
 fhandler_zero.o: $(WINSUP_H)
+fhandler_clipboard.o: $(WINSUP_H)
 fhandler_random.o: $(WINSUP_H)
 fork.o: $(WINSUP_H) dll_init.h
 glob.o: include/glob.h
Index: winsup/cygwin/fhandler.h
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/fhandler.h,v
retrieving revision 1.16
diff -u -r1.16 fhandler.h
--- fhandler.h  2000/07/29 04:19:24     1.16
+++ fhandler.h  2000/08/02 01:18:23
@@ -27,6 +27,7 @@
      fhandler_dev_raw     (fhandler_raw.cc)
      fhandler_dev_floppy  (fhandler_floppy.cc)
      fhandler_dev_tape    (fhandler_tape.cc)
+     fhandler_dev_clipboard    (fhandler_clip.cc)
 
      fhandler_pipe
      fhandler_socket      (net.cc)
@@ -94,8 +95,9 @@
   FH_NULL    = 0x00000013,     /* is the null device */
   FH_ZERO    = 0x00000014,     /* is the zero device */
   FH_RANDOM  = 0x00000015,     /* is a random device */
+  FH_CLIPBOARD = 0x00000016,  /* is the windows clipboard */
 
-  FH_NDEV    = 0x00000016,     /* Maximum number of devices */
+  FH_NDEV    = 0x00000017,     /* Maximum number of devices */
   FH_DEVMASK = 0x00000fff,     /* devices live here */
   FH_BAD     = 0xffffffff
 };
@@ -761,6 +763,29 @@
   int dup (fhandler_base *child);
 
   void dump ();
+};
+
+class fhandler_dev_clipboard: public fhandler_base
+{
+public:
+  fhandler_dev_clipboard (const char *name);
+
+  void dump ();
+
+  int is_windows (void) { return 1; }
+  int open (const char *path, int flags, mode_t mode = 0);
+  int write (const void *ptr, size_t len);
+  int read (void *ptr, size_t len);
+  int ioctl (unsigned int cmd, void *);
+  off_t lseek (off_t, int);
+  int close (void);
+
+  void set_close_on_exec (int val);
+  void fixup_after_fork (HANDLE parent);
+  select_record *select_read (select_record *s);
+  select_record *select_write (select_record *s);
+  select_record *select_except (select_record *s);
+  int ready_for_read (int fd, DWORD howlong, int ignra);
 };
 
 class fhandler_windows: public fhandler_base
Index: winsup/cygwin/hinfo.cc
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/hinfo.cc,v
retrieving revision 1.11
diff -u -r1.11 hinfo.cc
--- hinfo.cc    2000/07/29 16:01:23     1.11
+++ hinfo.cc    2000/08/02 01:18:24
@@ -282,6 +282,9 @@
       case FH_ZERO:
        fh = new (buf) fhandler_dev_zero (name);
        break;
+      case FH_CLIPBOARD:
+       fh = new (buf) fhandler_dev_clipboard (name);
+       break;
       case FH_RANDOM:
        fh = new (buf) fhandler_dev_random (name, unit);
        break;
Index: winsup/cygwin/path.cc
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/path.cc,v
retrieving revision 1.40
diff -u -r1.40 path.cc
--- path.cc     2000/07/29 17:36:05     1.40
+++ path.cc     2000/08/02 01:18:27
@@ -437,6 +437,7 @@
   "\\dev\\st%d",
   "nul",
   "\\dev\\zero",
+  "\\dev\\clipboard",
   "\\dev\\%srandom",
 };
 
@@ -502,6 +503,8 @@
        devn = FH_NULL;
       else if (deveq ("zero"))
        devn = FH_ZERO;
+      else if (deveq ("clipboard"))
+       devn = FH_CLIPBOARD;
       else if (deveq ("random") || deveq ("urandom"))
         {
          devn = FH_RANDOM;
Index: winsup/cygwin/winsup.h
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/winsup.h,v
retrieving revision 1.23
diff -u -r1.23 winsup.h
--- winsup.h    2000/07/29 16:24:42     1.23
+++ winsup.h    2000/08/02 01:18:31
@@ -66,8 +66,12 @@
 #undef _WINNETWK_H
 #undef _WINSVC_H
 
-/* The one function we use from winuser.h most of the time */
+/* The few functions we use from winuser.h most of the time */
 extern "C" DWORD WINAPI GetLastError (void);
+#define CF_TEXT 1
+extern "C" BOOL WINAPI OpenClipboard(HWND);
+extern "C" HANDLE WINAPI GetClipboardData(UINT);
+extern "C" BOOL WINAPI CloseClipboard(void);
 
 /* Used for runtime OS check/decisions. */
 enum os_type {winNT = 1, win95, win98, win32s, unknown};
--------------------------snip-------------------------


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