summaryrefslogtreecommitdiff
path: root/src/w32select.c
blob: 20f7cfc457fc6343735c1ad258e34a1049ba6322 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
/* Selection processing for Emacs on the Microsoft W32 API.
   Copyright (C) 1993, 1994 Free Software Foundation.

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Written by Kevin Gallo */

#include <config.h>
#include "lisp.h"
#include "w32term.h"	/* for all of the w32 includes */
#include "dispextern.h"	/* frame.h seems to want this */
#include "keyboard.h"
#include "frame.h"	/* Need this to get the X window of selected_frame */
#include "blockinput.h"
#include "buffer.h"
#include "charset.h"
#include "coding.h"
#include "composite.h"

Lisp_Object QCLIPBOARD;

/* Coding system for communicating with other Windows programs via the
   clipboard.  */
static Lisp_Object Vselection_coding_system;

/* Coding system for the next communicating with other Windows programs.  */
static Lisp_Object Vnext_selection_coding_system;

/* Sequence number, used where possible to detect when we are pasting
   our own text.  */
static DWORD last_clipboard_sequence_number;
extern ClipboardSequence_Proc clipboard_sequence_fn;

/* The last text we put into the clipboard.  This is used when the OS
   does not support sequence numbers (NT4, 95). It is undesirable to
   use data put on the clipboard by Emacs because the clipboard data
   could be MULEtilated by inappropriately chosen
   (next-)selection-coding-system.  For this reason, we must store the
   text *after* it was encoded/Unix-to-DOS-converted.  */
static unsigned char *last_clipboard_text = NULL;
static size_t clipboard_storage_size = 0;

#if 0
DEFUN ("w32-open-clipboard", Fw32_open_clipboard, Sw32_open_clipboard, 0, 1, 0,
       doc: /* This opens the clipboard with the given frame pointer.  */)
     (frame)
     Lisp_Object frame;
{
  BOOL ok = FALSE;

  if (!NILP (frame))
    CHECK_LIVE_FRAME (frame);

  BLOCK_INPUT;

  ok = OpenClipboard ((!NILP (frame) && FRAME_W32_P (XFRAME (frame))) ? FRAME_W32_WINDOW (XFRAME (frame)) : NULL);

  UNBLOCK_INPUT;

  return (ok ? frame : Qnil);
}

DEFUN ("w32-empty-clipboard", Fw32_empty_clipboard,
       Sw32_empty_clipboard, 0, 0, 0,
       doc: /* Empty the clipboard.
Assigns ownership of the clipboard to the window which opened it.  */)
     ()
{
  BOOL ok = FALSE;

  BLOCK_INPUT;

  ok = EmptyClipboard ();

  UNBLOCK_INPUT;

  return (ok ? Qt : Qnil);
}

DEFUN ("w32-close-clipboard", Fw32_close_clipboard,
       Sw32_close_clipboard, 0, 0, 0,
       doc: /* Close the clipboard.  */)
     ()
{
  BOOL ok = FALSE;

  BLOCK_INPUT;

  ok = CloseClipboard ();

  UNBLOCK_INPUT;

  return (ok ? Qt : Qnil);
}

#endif

DEFUN ("w32-set-clipboard-data", Fw32_set_clipboard_data,
       Sw32_set_clipboard_data, 1, 2, 0,
       doc: /* This sets the clipboard data to the given text.  */)
    (string, frame)
    Lisp_Object string, frame;
{
  BOOL ok = TRUE;
  HANDLE htext;
  int nbytes;
  int truelen, nlines = 0;
  unsigned char *src;
  unsigned char *dst;

  CHECK_STRING (string);

  if (!NILP (frame))
    CHECK_LIVE_FRAME (frame);

  BLOCK_INPUT;

  /* Include the terminating NULL character in the source of
     conversion.  */
  nbytes = SBYTES (string) + 1;
  src = SDATA (string);
  dst = src;

  /* We need to know how many lines there are, since we need CRLF line
     termination for compatibility with other Windows Programs.
     avoid using strchr because it recomputes the length every time */
  while ((dst = memchr (dst, '\n', nbytes - (dst - src))) != NULL)
    {
      nlines++;
      dst++;
    }

  {
    /* Since we are now handling multilingual text, we must consider
       encoding text for the clipboard.  */
    int charset_info = find_charset_in_text (src, SCHARS (string),
					     nbytes, NULL, Qnil);

    if (charset_info == 0)
      {
	/* No multibyte character in OBJ.  We need not encode it.  */

	/* Need to know final size after CR chars are inserted (the
	   standard CF_TEXT clipboard format uses CRLF line endings,
	   while Emacs uses just LF internally).  */

	truelen = nbytes + nlines;

	if ((htext = GlobalAlloc (GMEM_MOVEABLE | GMEM_DDESHARE, truelen)) == NULL)
	  goto error;

	if ((dst = (unsigned char *) GlobalLock (htext)) == NULL)
	  goto error;

	/* convert to CRLF line endings expected by clipboard */
	while (1)
	  {
	    unsigned char *next;
	    /* copy next line or remaining bytes including '\0' */
	    next = _memccpy (dst, src, '\n', nbytes);
	    if (next)
	      {
		/* copied one line ending with '\n' */
		int copied = next - dst;
		nbytes -= copied;
		src += copied;
		/* insert '\r' before '\n' */
		next[-1] = '\r';
		next[0] = '\n';
		dst = next + 1;
	      }
	    else
	      /* copied remaining partial line -> now finished */
	      break;
	  }

	GlobalUnlock (htext);

	Vlast_coding_system_used = Qraw_text;
      }
    else
      {
	/* We must encode contents of OBJ to the selection coding
           system. */
	int bufsize;
	struct coding_system coding;
	HANDLE htext2;

	if (NILP (Vnext_selection_coding_system))
	  Vnext_selection_coding_system = Vselection_coding_system;
	setup_coding_system
	  (Fcheck_coding_system (Vnext_selection_coding_system), &coding);
	if (SYMBOLP (coding.pre_write_conversion)
	    && !NILP (Ffboundp (coding.pre_write_conversion)))
	  {
	    string = run_pre_post_conversion_on_str (string, &coding, 1);
	    src = SDATA (string);
	    /* Include the terminating NULL character in the source of
	       conversion.  */
	    nbytes = SBYTES (string) + 1;
	  }
	coding.src_multibyte = 1;
	coding.dst_multibyte = 0;
	/* Need to set COMPOSITION_DISABLED, otherwise Emacs crashes in
	   encode_coding_iso2022 trying to dereference a null pointer.  */
	coding.composing = COMPOSITION_DISABLED;
	if (coding.type == coding_type_iso2022)
	  coding.flags |= CODING_FLAG_ISO_SAFE;
	Vnext_selection_coding_system = Qnil;
	coding.mode |= CODING_MODE_LAST_BLOCK;
	bufsize = encoding_buffer_size (&coding, nbytes);
	if ((htext = GlobalAlloc (GMEM_MOVEABLE | GMEM_DDESHARE, bufsize)) == NULL)
	  goto error;
	if ((dst = (unsigned char *) GlobalLock (htext)) == NULL)
	  goto error;
	encode_coding (&coding, src, dst, nbytes, bufsize);
	Vlast_coding_system_used = coding.symbol;

	/* If clipboard sequence numbers are not supported, keep a copy for
	   later comparison.  */
	if (!clipboard_sequence_fn)
	  {
	    /* Stash away the data we are about to put into the
	       clipboard, so we could later check inside
	       Fw32_get_clipboard_data whether the clipboard still
	       holds our data.  */
	    if (clipboard_storage_size < coding.produced)
	      {
		clipboard_storage_size = coding.produced + 100;
		last_clipboard_text = (char *) xrealloc (last_clipboard_text,
							 clipboard_storage_size);
	      }
	    if (last_clipboard_text)
	      memcpy (last_clipboard_text, dst, coding.produced);
	  }

	GlobalUnlock (htext);

	/* Shrink data block to actual size.  */
	htext2 = GlobalReAlloc (htext, coding.produced,
                                GMEM_MOVEABLE | GMEM_DDESHARE);
	if (htext2 != NULL) htext = htext2;
      }
  }

  if (!OpenClipboard ((!NILP (frame) && FRAME_W32_P (XFRAME (frame))) ? FRAME_W32_WINDOW (XFRAME (frame)) : NULL))
    goto error;

  ok = EmptyClipboard () && SetClipboardData (CF_TEXT, htext);

  CloseClipboard ();

  /* Common sense says to read the sequence number inside the
     OpenClipboard/ CloseClipboard block to avoid race conditions
     where another app puts something on the clipboard straight after
     us. But experience suggests that the sequence number from the
     SetClipboardData is not allocated until we close the clipboard!
     Since clipboard operations are normally user-driven, the race
     condition is probably not going to really happen.  */
  if (clipboard_sequence_fn)
    last_clipboard_sequence_number = clipboard_sequence_fn ();

  if (ok) goto done;

 error:

  ok = FALSE;
  if (htext) GlobalFree (htext);
  if (last_clipboard_text)
    *last_clipboard_text = '\0';

  last_clipboard_sequence_number = 0;

 done:
  UNBLOCK_INPUT;

  return (ok ? string : Qnil);
}

DEFUN ("w32-get-clipboard-data", Fw32_get_clipboard_data,
       Sw32_get_clipboard_data, 0, 1, 0,
       doc: /* This gets the clipboard data in text format.  */)
     (frame)
     Lisp_Object frame;
{
  HANDLE htext;
  Lisp_Object ret = Qnil;

  if (!NILP (frame))
    CHECK_LIVE_FRAME (frame);

  BLOCK_INPUT;

  if (!OpenClipboard ((!NILP (frame) && FRAME_W32_P (XFRAME (frame))) ? FRAME_W32_WINDOW (XFRAME (frame)) : NULL))
    goto done;

  if ((htext = GetClipboardData (CF_TEXT)) == NULL)
    goto closeclip;

  {
    unsigned char *src;
    unsigned char *dst;
    int nbytes;
    int truelen;
    int require_decoding = 0;

    if ((src = (unsigned char *) GlobalLock (htext)) == NULL)
      goto closeclip;

    nbytes = strlen (src);

    /* If the text in clipboard is identical to what we put there
       last time w32_set_clipboard_data was called, pretend there's no
       data in the clipboard.  This is so we don't pass our own text
       from the clipboard (which might be troublesome if the killed
       text includes null characters).  */
    if ((clipboard_sequence_fn
	 && clipboard_sequence_fn () == last_clipboard_sequence_number)
	|| (last_clipboard_text
	    && clipboard_storage_size >= nbytes
	    && memcmp(last_clipboard_text, src, nbytes) == 0))
      goto closeclip;

    {
      /* If the clipboard data contains any non-ascii code, we
	 need to decode it.  */
      int i;

      for (i = 0; i < nbytes; i++)
	{
	  if (src[i] >= 0x80)
	    {
	      require_decoding = 1;
	      break;
	    }
	}
    }

    if (require_decoding)
      {
	int bufsize;
	unsigned char *buf;
	struct coding_system coding;

	if (NILP (Vnext_selection_coding_system))
	  Vnext_selection_coding_system = Vselection_coding_system;
	setup_coding_system
	  (Fcheck_coding_system (Vnext_selection_coding_system), &coding);
	coding.src_multibyte = 0;
	coding.dst_multibyte = 1;
	Vnext_selection_coding_system = Qnil;
	coding.mode |= CODING_MODE_LAST_BLOCK;
	/* We explicitely disable composition handling because
	   selection data should not contain any composition
	   sequence.  */
	coding.composing = COMPOSITION_DISABLED;
	bufsize = decoding_buffer_size (&coding, nbytes);
	buf = (unsigned char *) xmalloc (bufsize);
	decode_coding (&coding, src, buf, nbytes, bufsize);
	Vlast_coding_system_used = coding.symbol;
        ret = make_string_from_bytes ((char *) buf,
                                      coding.produced_char, coding.produced);
	xfree (buf);
	if (SYMBOLP (coding.post_read_conversion)
	    && !NILP (Ffboundp (coding.post_read_conversion)))
	  ret = run_pre_post_conversion_on_str (ret, &coding, 0);
      }
    else
      {
	/* Need to know final size after CR chars are removed because we
	   can't change the string size manually, and doing an extra
	   copy is silly.  Note that we only remove CR when it appears
	   as part of CRLF.  */

	truelen = nbytes;
	dst = src;
	/* avoid using strchr because it recomputes the length everytime */
	while ((dst = memchr (dst, '\r', nbytes - (dst - src))) != NULL)
	  {
	    if (dst[1] == '\n')	/* safe because of trailing '\0' */
	      truelen--;
	    dst++;
	  }

	ret = make_uninit_string (truelen);

	/* Convert CRLF line endings (the standard CF_TEXT clipboard
	   format) to LF endings as used internally by Emacs.  */

	dst = SDATA (ret);
	while (1)
	  {
	    unsigned char *next;
	    /* copy next line or remaining bytes excluding '\0' */
	    next = _memccpy (dst, src, '\r', nbytes);
	    if (next)
	      {
		/* copied one line ending with '\r' */
		int copied = next - dst;
		nbytes -= copied;
		dst += copied;
		src += copied;
		if (*src == '\n')
		  dst--;	/* overwrite '\r' with '\n' */
	      }
	    else
	      /* copied remaining partial line -> now finished */
	      break;
	  }

	Vlast_coding_system_used = Qraw_text;
      }

    GlobalUnlock (htext);
  }

 closeclip:
  CloseClipboard ();

 done:
  UNBLOCK_INPUT;

  return (ret);
}

/* Support checking for a clipboard selection. */

DEFUN ("x-selection-exists-p", Fx_selection_exists_p, Sx_selection_exists_p,
       0, 1, 0,
       doc: /* Whether there is an owner for the given X Selection.
The arg should be the name of the selection in question, typically one of
the symbols `PRIMARY', `SECONDARY', or `CLIPBOARD'.
\(Those are literal upper-case symbol names, since that's what X expects.)
For convenience, the symbol nil is the same as `PRIMARY',
and t is the same as `SECONDARY'.  */)
  (selection)
     Lisp_Object selection;
{
  CHECK_SYMBOL (selection);

  /* Return nil for PRIMARY and SECONDARY selections; for CLIPBOARD, check
     if the clipboard currently has valid text format contents. */

  if (EQ (selection, QCLIPBOARD))
    {
      Lisp_Object val = Qnil;

      if (OpenClipboard (NULL))
	{
	  int format = 0;
	  while (format = EnumClipboardFormats (format))
	    if (format == CF_TEXT)
	      {
		val = Qt;
		break;
	      }
	  CloseClipboard ();
	}
      return val;
    }
  return Qnil;
}

void
syms_of_w32select ()
{
#if 0
  defsubr (&Sw32_open_clipboard);
  defsubr (&Sw32_empty_clipboard);
  defsubr (&Sw32_close_clipboard);
#endif
  defsubr (&Sw32_set_clipboard_data);
  defsubr (&Sw32_get_clipboard_data);
  defsubr (&Sx_selection_exists_p);

  DEFVAR_LISP ("selection-coding-system", &Vselection_coding_system,
	       doc: /* Coding system for communicating with other programs.
When sending or receiving text via cut_buffer, selection, and clipboard,
the text is encoded or decoded by this coding system.
The default value is `iso-latin-1-dos'.  */);
  Vselection_coding_system = intern ("iso-latin-1-dos");

  DEFVAR_LISP ("next-selection-coding-system", &Vnext_selection_coding_system,
	       doc: /* Coding system for the next communication with other programs.
Usually, `selection-coding-system' is used for communicating with
other programs.  But, if this variable is set, it is used for the
next communication only.  After the communication, this variable is
set to nil.  */);
  Vnext_selection_coding_system = Qnil;

  QCLIPBOARD = intern ("CLIPBOARD");	staticpro (&QCLIPBOARD);
}

/* arch-tag: c96e9724-5eb1-4dad-be07-289f092fd2af
   (do not change this comment) */