newlib-cygwin/winsup/cygwin/fhandler_clipboard.cc

278 lines
6.5 KiB
C++

/* fhandler_dev_clipboard: code to access /dev/clipboard
Copyright 2000, 2001, 2002 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 <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <windows.h>
#include <wingdi.h>
#include <winuser.h>
#include "cygerrno.h"
#include "security.h"
#include "fhandler.h"
/*
* Robert Collins:
* FIXME: should we use GetClipboardSequenceNumber to tell if the clipboard has
* changed? How does /dev/clipboard operate under (say) linux?
*/
static const NO_COPY char *CYGWIN_NATIVE = "CYGWIN_NATIVE_CLIPBOARD";
/* this is MT safe because windows format id's are atomic */
static UINT cygnativeformat;
fhandler_dev_clipboard::fhandler_dev_clipboard ()
: fhandler_base (FH_CLIPBOARD), pos (0), membuffer (NULL), msize (0),
eof (true)
{
/* FIXME: check for errors and loop until we can open the clipboard */
OpenClipboard (NULL);
cygnativeformat = RegisterClipboardFormat (CYGWIN_NATIVE);
CloseClipboard ();
}
/*
* Special clipboard dup to duplicate input and output
* handles.
*/
int
fhandler_dev_clipboard::dup (fhandler_base * child)
{
fhandler_dev_clipboard *fhc = (fhandler_dev_clipboard *) child;
if (!fhc->open (NULL, get_flags (), 0))
system_printf ("error opening clipboard, %E");
fhc->membuffer = membuffer;
fhc->pos = pos;
fhc->msize = msize;
return 0;
}
int
fhandler_dev_clipboard::open (path_conv *, int flags, mode_t)
{
set_flags (flags | O_TEXT);
eof = false;
pos = 0;
if (membuffer)
free (membuffer);
membuffer = NULL;
if (!cygnativeformat)
cygnativeformat = RegisterClipboardFormat (CYGWIN_NATIVE);
set_nohandle (true);
set_open_status ();
return 1;
}
static int
set_clipboard (const void *buf, size_t len)
{
HGLOBAL hmem;
unsigned char *clipbuf;
/* Native CYGWIN format */
OpenClipboard (0);
hmem = GlobalAlloc (GMEM_MOVEABLE, len + sizeof (size_t));
if (!hmem)
{
system_printf ("Couldn't allocate global buffer for write");
return -1;
}
clipbuf = (unsigned char *) GlobalLock (hmem);
memcpy (clipbuf + sizeof (size_t), buf, len);
*(size_t *) (clipbuf) = len;
GlobalUnlock (hmem);
EmptyClipboard ();
if (!cygnativeformat)
cygnativeformat = RegisterClipboardFormat (CYGWIN_NATIVE);
if (!SetClipboardData (cygnativeformat, hmem))
{
system_printf
("Couldn't write native format to the clipboard %04x %x",
cygnativeformat, hmem);
/* FIXME: return an appriate error code &| set_errno(); */
return -1;
}
CloseClipboard ();
if (GlobalFree (hmem))
{
system_printf
("Couldn't free global buffer after write to the clipboard");
/* FIXME: return an appriate error code &| set_errno(); */
return 0;
}
/* CF_TEXT/CF_OEMTEXT for copying to wordpad and the like */
OpenClipboard (0);
hmem = GlobalAlloc (GMEM_MOVEABLE, len + 2);
if (!hmem)
{
system_printf ("Couldn't allocate global buffer for write");
return -1;
}
clipbuf = (unsigned char *) GlobalLock (hmem);
memcpy (clipbuf, buf, len);
*(clipbuf + len) = '\0';
*(clipbuf + len + 1) = '\0';
GlobalUnlock (hmem);
if (!SetClipboardData
((current_codepage == ansi_cp ? CF_TEXT : CF_OEMTEXT), hmem))
{
system_printf ("Couldn't write to the clipboard");
/* FIXME: return an appriate error code &| set_errno(); */
return -1;
}
CloseClipboard ();
if (GlobalFree (hmem))
{
system_printf
("Couldn't free global buffer after write to the clipboard");
/* FIXME: return an appriate error code &| set_errno(); */
}
return 0;
}
/* FIXME: arbitrary seeking is not handled */
int
fhandler_dev_clipboard::write (const void *buf, size_t len)
{
if (!eof)
{
/* write to our membuffer */
size_t cursize = msize;
void *tempbuffer = realloc (membuffer, cursize + len);
if (!tempbuffer)
{
system_printf ("Couldn't realloc() clipboard buffer for write");
return -1;
}
membuffer = tempbuffer;
msize = cursize + len;
memcpy ((unsigned char *) membuffer + cursize, buf, len);
/* now pass to windows */
if (set_clipboard (membuffer, msize))
{
/* FIXME: membuffer is now out of sync with pos, but msize is used above */
set_errno (ENOSPC);
return -1;
}
pos = msize;
set_errno (0);
eof = false;
return len;
}
else
{
/* FIXME: return 0 bytes written, file not open */
return 0;
}
}
void __stdcall
fhandler_dev_clipboard::read (void *ptr, size_t& len)
{
HGLOBAL hglb;
size_t ret;
UINT formatlist[2];
UINT format;
if (eof)
len = 0;
else
{
formatlist[0] = cygnativeformat;
formatlist[1] = current_codepage == ansi_cp ? CF_TEXT : CF_OEMTEXT;
OpenClipboard (0);
if ((format = GetPriorityClipboardFormat (formatlist, 2)) <= 0)
{
CloseClipboard ();
#if 0
system_printf ("a non-accepted format! %d", format);
#endif
set_errno (0);
len = 0;
}
else
{
hglb = GetClipboardData (format);
if (format == cygnativeformat)
{
unsigned char *buf = (unsigned char *) GlobalLock (hglb);
size_t buflen = (*(size_t *) buf);
ret = ((len > (buflen - pos)) ? (buflen - pos) : len);
memcpy (ptr, buf + sizeof (size_t)+ pos , ret);
pos += ret;
if (pos + len - ret >= buflen)
eof = true;
GlobalUnlock (hglb);
}
else
{
LPSTR lpstr;
lpstr = (LPSTR) GlobalLock (hglb);
ret = ((len > (strlen (lpstr) - pos)) ? (strlen (lpstr) - pos)
: len);
memcpy (ptr, lpstr + pos, ret);
//ret = snprintf((char *) ptr, len, "%s", lpstr);//+pos);
pos += ret;
if (pos + len - ret >= strlen (lpstr))
eof = true;
GlobalUnlock (hglb);
}
CloseClipboard ();
set_errno (0);
len = ret;
}
}
}
__off64_t
fhandler_dev_clipboard::lseek (__off64_t offset, int whence)
{
/* On reads we check this at read time, not seek time.
* On writes we use this to decide how to write - empty and write, or open, copy, empty
* and write
*/
pos = offset;
/* treat seek like rewind */
if (membuffer)
free (membuffer);
msize = 0;
return 0;
}
int
fhandler_dev_clipboard::close (void)
{
eof = true;
pos = 0;
if (membuffer)
free (membuffer);
msize = 0;
return 0;
}
void
fhandler_dev_clipboard::dump ()
{
paranoid_printf ("here, fhandler_dev_clipboard");
}