Fix bug #5816.
[bpt/emacs.git] / src / w16select.c
CommitLineData
767079a8 1/* 16-bit Windows Selection processing for emacs on MS-Windows
0b5538bd 2 Copyright (C) 1996, 1997, 2001, 2002, 2003, 2004,
114f9c96 3 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
8de1855e 4
21cfcccf
EZ
5This file is part of GNU Emacs.
6
9ec0b715 7GNU Emacs is free software: you can redistribute it and/or modify
21cfcccf 8it under the terms of the GNU General Public License as published by
9ec0b715
GM
9the Free Software Foundation, either version 3 of the License, or
10(at your option) any later version.
21cfcccf
EZ
11
12GNU Emacs is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
9ec0b715 18along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
21cfcccf
EZ
19
20/* These functions work by using WinOldAp interface. WinOldAp
21 (WINOLDAP.MOD) is a Microsoft Windows extension supporting
22 "old" (character-mode) application access to Dynamic Data Exchange,
23 menus, and the Windows clipboard. */
24
25/* Written by Dale P. Smith <dpsm@en.com> */
26/* Adapted to DJGPP v1 by Eli Zaretskii <eliz@is.elta.co.il> */
27
28#ifdef MSDOS
29
30#include <config.h>
31#include <string.h>
32#include <dpmi.h>
33#include <go32.h>
34#include <sys/farptr.h>
d7306fe6 35#include <setjmp.h>
21cfcccf
EZ
36#include "lisp.h"
37#include "dispextern.h" /* frame.h seems to want this */
38#include "frame.h" /* Need this to get the X window of selected_frame */
39#include "blockinput.h"
583f5d53 40#include "buffer.h"
83be827a 41#include "character.h"
583f5d53 42#include "coding.h"
f7d05dc4 43#include "composite.h"
21cfcccf
EZ
44
45/* If ever some function outside this file will need to call any
46 clipboard-related function, the following prototypes and constants
47 should be put on a header file. Right now, nobody else uses them. */
48
49#define CF_TEXT 0x01
50#define CF_BITMAP 0x02
51#define CF_METAFILE 0x03
52#define CF_SYLK 0x04
53#define CF_DIF 0x05
54#define CF_TIFF 0x06
55#define CF_OEMTEXT 0x07
56#define CF_DIBBITMAP 0x08
57#define CF_WINWRITE 0x80
58#define CF_DSPTEXT 0x81
59#define CF_DSPBITMAP 0x82
60
61unsigned identify_winoldap_version (void);
62unsigned open_clipboard (void);
63unsigned empty_clipboard (void);
583f5d53 64unsigned set_clipboard_data (unsigned, void *, unsigned, int);
21cfcccf 65unsigned get_clipboard_data_size (unsigned);
583f5d53 66unsigned get_clipboard_data (unsigned, void *, unsigned, int);
21cfcccf
EZ
67unsigned close_clipboard (void);
68unsigned clipboard_compact (unsigned);
69
70Lisp_Object QCLIPBOARD, QPRIMARY;
71
583f5d53
EZ
72/* Coding system for communicating with other Windows programs via the
73 clipboard. */
199c7c44 74static Lisp_Object Vselection_coding_system;
583f5d53 75
9963e859
EZ
76/* Coding system for the next communicating with other Windows programs. */
77static Lisp_Object Vnext_selection_coding_system;
78
21cfcccf
EZ
79/* The segment address and the size of the buffer in low
80 memory used to move data between us and WinOldAp module. */
21cfcccf
EZ
81static struct {
82 unsigned long size;
83 unsigned short rm_segment;
84} clipboard_xfer_buf_info;
5033894e
EZ
85
86/* The last text we put into the clipboard. This is used to prevent
87 passing back our own text from the clipboard, instead of using the
88 kill ring. The former is undesirable because the clipboard data
89 could be MULEtilated by inappropriately chosen
90 (next-)selection-coding-system. For this reason, we must store the
91 text *after* it was encoded/Unix-to-DOS-converted. */
92static unsigned char *last_clipboard_text;
93
94/* The size of allocated storage for storing the clipboard data. */
95static size_t clipboard_storage_size;
21cfcccf
EZ
96\f
97/* Emulation of `__dpmi_int' and friends for DJGPP v1.x */
98
99#if __DJGPP__ < 2
100
101typedef _go32_dpmi_registers __dpmi_regs;
102#define __tb _go32_info_block.linear_address_of_transfer_buffer
103#define _dos_ds _go32_info_block.selector_for_linear_memory
104
105static int
106__dpmi_int (intno, regs)
107 int intno;
108 __dpmi_regs *regs;
109{
110 regs->x.ss = regs->x.sp = regs->x.flags = 0;
111 return _go32_dpmi_simulate_int (intno, regs);
112}
113
114#endif /* __DJGPP__ < 2 */
115\f
116/* C functions to access the Windows 3.1x clipboard from DOS apps.
117
118 The information was obtained from the Microsoft Knowledge Base,
119 article Q67675 and can be found at:
120 http://www.microsoft.com/kb/developr/win_dk/q67675.htm */
121
122/* See also Ralf Brown's Interrupt List.
123
124 I also seem to remember reading about this in Dr. Dobbs Journal a
125 while ago, but if you knew my memory... :-)
126
127 Dale P. Smith <dpsm@en.com> */
128
129/* Return the WinOldAp support version, or 0x1700 if not supported. */
130unsigned
131identify_winoldap_version ()
132{
133 __dpmi_regs regs;
134
135 /* Calls Int 2Fh/AX=1700h
136 Return Values AX == 1700H: Clipboard functions not available
137 <> 1700H: AL = Major version number
138 AH = Minor version number */
139 regs.x.ax = 0x1700;
140 __dpmi_int(0x2f, &regs);
141 return regs.x.ax;
142}
143
144/* Open the clipboard, return non-zero if successfull. */
145unsigned
146open_clipboard ()
147{
148 __dpmi_regs regs;
149
150 /* Is WINOLDAP supported? */
151 /* Kludge alert!! If WinOldAp is not supported, we return a 0,
152 which is the same as ``Clipboard already open''. Currently,
153 this is taken as an error by all the functions that use
154 `open_clipboard', but if somebody someday will use that ``open''
155 clipboard, they will have interesting time debugging it... */
156 if (identify_winoldap_version () == 0x1700)
157 return 0;
158
159 /* Calls Int 2Fh/AX=1701h
160 Return Values AX == 0: Clipboard already open
161 <> 0: Clipboard opened */
162 regs.x.ax = 0x1701;
163 __dpmi_int(0x2f, &regs);
164 return regs.x.ax;
165}
166
167/* Empty clipboard, return non-zero if successfull. */
168unsigned
169empty_clipboard ()
170{
171 __dpmi_regs regs;
8de1855e 172
21cfcccf
EZ
173 /* Calls Int 2Fh/AX=1702h
174 Return Values AX == 0: Error occurred
175 <> 0: OK, Clipboard emptied */
176 regs.x.ax = 0x1702;
177 __dpmi_int(0x2f, &regs);
178 return regs.x.ax;
179}
180
181/* Ensure we have a buffer in low memory with enough memory for data
182 of size WANT_SIZE. Return the linear address of the buffer. */
183static unsigned long
184alloc_xfer_buf (want_size)
185 unsigned want_size;
186{
187 __dpmi_regs regs;
188
189 /* If the usual DJGPP transfer buffer is large enough, use that. */
190 if (want_size <= _go32_info_block.size_of_transfer_buffer)
191 return __tb & 0xfffff;
192
767079a8
EZ
193 /* Don't even try to allocate more than 1MB of memory: DOS cannot
194 possibly handle that (it will overflow the BX register below). */
195 if (want_size > 0xfffff)
196 return 0;
197
21cfcccf
EZ
198 /* Need size rounded up to the nearest paragraph, and in
199 paragraph units (1 paragraph = 16 bytes). */
200 clipboard_xfer_buf_info.size = (want_size + 15) >> 4;
201
202 /* The NT DPMI host crashes us if we free DOS memory via the
203 DPMI service. Work around by calling DOS allocate/free block. */
204 regs.h.ah = 0x48;
205 regs.x.bx = clipboard_xfer_buf_info.size;
206 __dpmi_int (0x21, &regs);
207 if (regs.x.flags & 1)
208 {
209 clipboard_xfer_buf_info.size = 0;
210 return 0;
211 }
212
213 clipboard_xfer_buf_info.rm_segment = regs.x.ax;
214 return (((int)clipboard_xfer_buf_info.rm_segment) << 4) & 0xfffff;
215}
216
217/* Free our clipboard buffer. We always free it after use, because
218 keeping it leaves less free conventional memory for subprocesses.
219 The clipboard buffer tends to be large in size, because for small
220 clipboard data sizes we use the DJGPP transfer buffer. */
221static void
222free_xfer_buf ()
223{
224 /* If the size is 0, we used DJGPP transfer buffer, so don't free. */
225 if (clipboard_xfer_buf_info.size)
226 {
227 __dpmi_regs regs;
228
229 /* The NT DPMI host crashes us if we free DOS memory via
230 the DPMI service. Work around by calling DOS free block. */
231 regs.h.ah = 0x49;
232 regs.x.es = clipboard_xfer_buf_info.rm_segment;
233 __dpmi_int (0x21, &regs);
234 clipboard_xfer_buf_info.size = 0;
235 }
236}
237
0265f89f 238/* Copy data into the clipboard, return zero if successfull. */
21cfcccf 239unsigned
583f5d53 240set_clipboard_data (Format, Data, Size, Raw)
21cfcccf
EZ
241 unsigned Format;
242 void *Data;
243 unsigned Size;
583f5d53 244 int Raw;
21cfcccf
EZ
245{
246 __dpmi_regs regs;
247 unsigned truelen;
248 unsigned long xbuf_addr, buf_offset;
249 unsigned char *dp = Data, *dstart = dp;
250
538d05bb 251 if (Format != CF_OEMTEXT)
aae41d97 252 return 3;
21cfcccf
EZ
253
254 /* need to know final size after '\r' chars are inserted (the
538d05bb 255 standard CF_OEMTEXT clipboard format uses CRLF line endings,
21cfcccf 256 while Emacs uses just LF internally). */
0265f89f 257 truelen = Size + 1; /* +1 for the terminating null */
583f5d53
EZ
258
259 if (!Raw)
21cfcccf 260 {
583f5d53
EZ
261 /* avoid using strchr because it recomputes the length everytime */
262 while ((dp = memchr (dp, '\n', Size - (dp - dstart))) != 0)
263 {
264 truelen++;
265 dp++;
266 }
21cfcccf
EZ
267 }
268
269 if (clipboard_compact (truelen) < truelen)
aae41d97 270 return 1;
21cfcccf
EZ
271
272 if ((xbuf_addr = alloc_xfer_buf (truelen)) == 0)
aae41d97 273 return 1;
21cfcccf 274
583f5d53
EZ
275 /* Move the buffer into the low memory, convert LF into CR-LF if needed. */
276 if (Raw)
0236e3f1
EZ
277 {
278 dosmemput (Data, Size, xbuf_addr);
279
280 /* Terminate with a null, otherwise Windows does strange things
281 when the text size is an integral multiple of 32 bytes. */
282 _farpokeb (_dos_ds, xbuf_addr + Size, '\0');
283 }
583f5d53 284 else
21cfcccf 285 {
583f5d53
EZ
286 dp = Data;
287 buf_offset = xbuf_addr;
288 _farsetsel (_dos_ds);
289 while (Size--)
290 {
0265f89f
EZ
291 /* Don't allow them to put binary data into the clipboard, since
292 it will cause yanked data to be truncated at the first null. */
293 if (*dp == '\0')
294 return 2;
583f5d53
EZ
295 if (*dp == '\n')
296 _farnspokeb (buf_offset++, '\r');
297 _farnspokeb (buf_offset++, *dp++);
298 }
21cfcccf 299
0236e3f1
EZ
300 /* Terminate with a null, otherwise Windows does strange things
301 when the text size is an integral multiple of 32 bytes. */
302 _farnspokeb (buf_offset, '\0');
303 }
0265f89f 304
5033894e
EZ
305 /* Stash away the data we are about to put into the clipboard, so we
306 could later check inside get_clipboard_data whether the clipboard
307 still holds our data. */
308 if (clipboard_storage_size < truelen)
309 {
310 clipboard_storage_size = truelen + 100;
311 last_clipboard_text =
312 (char *) xrealloc (last_clipboard_text, clipboard_storage_size);
313 }
314 if (last_clipboard_text)
315 dosmemget (xbuf_addr, truelen, last_clipboard_text);
316
21cfcccf
EZ
317 /* Calls Int 2Fh/AX=1703h with:
318 DX = WinOldAp-Supported Clipboard format
319 ES:BX = Pointer to data
320 SI:CX = Size of data in bytes
321 Return Values AX == 0: Error occurred
322 <> 0: OK. Data copied into the Clipboard. */
323 regs.x.ax = 0x1703;
324 regs.x.dx = Format;
325 regs.x.si = truelen >> 16;
326 regs.x.cx = truelen & 0xffff;
327 regs.x.es = xbuf_addr >> 4;
328 regs.x.bx = xbuf_addr & 15;
329 __dpmi_int(0x2f, &regs);
330
331 free_xfer_buf ();
332
5033894e
EZ
333 /* If the above failed, invalidate the local copy of the clipboard. */
334 if (regs.x.ax == 0)
335 *last_clipboard_text = '\0';
336
aae41d97
EZ
337 /* Zero means success, otherwise (1, 2, or 3) it's an error. */
338 return regs.x.ax > 0 ? 0 : 3;
21cfcccf
EZ
339}
340
341/* Return the size of the clipboard data of format FORMAT. */
342unsigned
343get_clipboard_data_size (Format)
344 unsigned Format;
345{
346 __dpmi_regs regs;
347
348 /* Calls Int 2Fh/AX=1704h with:
349 DX = WinOldAp-Supported Clipboard format
350 Return Values DX:AX == Size of the data in bytes, including any
351 headers.
352 == 0 If data in this format is not in
353 the clipboard. */
354 regs.x.ax = 0x1704;
355 regs.x.dx = Format;
356 __dpmi_int(0x2f, &regs);
357 return ( (((unsigned)regs.x.dx) << 16) | regs.x.ax);
358}
359
360/* Get clipboard data, return its length.
361 Warning: this doesn't check whether DATA has enough space to hold
362 SIZE bytes. */
363unsigned
583f5d53 364get_clipboard_data (Format, Data, Size, Raw)
21cfcccf
EZ
365 unsigned Format;
366 void *Data;
367 unsigned Size;
583f5d53 368 int Raw;
21cfcccf
EZ
369{
370 __dpmi_regs regs;
21cfcccf
EZ
371 unsigned long xbuf_addr;
372 unsigned char *dp = Data;
373
538d05bb 374 if (Format != CF_OEMTEXT)
21cfcccf
EZ
375 return 0;
376
377 if (Size == 0)
378 return 0;
379
380 if ((xbuf_addr = alloc_xfer_buf (Size)) == 0)
381 return 0;
382
383 /* Calls Int 2Fh/AX=1705h with:
384 DX = WinOldAp-Supported Clipboard format
385 ES:BX = Pointer to data buffer to hold data
386 Return Values AX == 0: Error occurred (or data in this format is not
387 in the clipboard)
388 <> 0: OK */
389 regs.x.ax = 0x1705;
390 regs.x.dx = Format;
391 regs.x.es = xbuf_addr >> 4;
392 regs.x.bx = xbuf_addr & 15;
393 __dpmi_int(0x2f, &regs);
394 if (regs.x.ax != 0)
395 {
5033894e
EZ
396 unsigned char null_char = '\0';
397 unsigned long xbuf_beg = xbuf_addr;
398
399 /* If last_clipboard_text is NULL, we don't want to slow down
400 the next loop by an additional test. */
401 register unsigned char *lcdp =
402 last_clipboard_text == NULL ? &null_char : last_clipboard_text;
8de1855e 403
583f5d53
EZ
404 /* Copy data from low memory, remove CR
405 characters before LF if needed. */
21cfcccf
EZ
406 _farsetsel (_dos_ds);
407 while (Size--)
408 {
409 register unsigned char c = _farnspeekb (xbuf_addr++);
410
5033894e
EZ
411 if (*lcdp == c)
412 lcdp++;
413
583f5d53 414 if ((*dp++ = c) == '\r' && !Raw && _farnspeekb (xbuf_addr) == '\n')
21cfcccf
EZ
415 {
416 dp--;
417 *dp++ = '\n';
418 xbuf_addr++;
5033894e
EZ
419 if (*lcdp == '\n')
420 lcdp++;
21cfcccf
EZ
421 }
422 /* Windows reportedly rounds up the size of clipboard data
4029384b
EZ
423 (passed in SIZE) to a multiple of 32, and removes trailing
424 spaces from each line without updating SIZE. We therefore
425 bail out when we see the first null character. */
426 else if (c == '\0')
0265f89f 427 break;
21cfcccf 428 }
5033894e
EZ
429
430 /* If the text in clipboard is identical to what we put there
431 last time set_clipboard_data was called, pretend there's no
432 data in the clipboard. This is so we don't pass our own text
4029384b
EZ
433 from the clipboard (which might be troublesome if the killed
434 text includes null characters). */
5033894e
EZ
435 if (last_clipboard_text &&
436 xbuf_addr - xbuf_beg == (long)(lcdp - last_clipboard_text))
437 dp = (unsigned char *)Data + 1;
21cfcccf
EZ
438 }
439
440 free_xfer_buf ();
441
0265f89f 442 return (unsigned) (dp - (unsigned char *)Data - 1);
21cfcccf
EZ
443}
444
445/* Close clipboard, return non-zero if successfull. */
446unsigned
447close_clipboard ()
448{
449 __dpmi_regs regs;
450
451 /* Calls Int 2Fh/AX=1708h
452 Return Values AX == 0: Error occurred
453 <> 0: OK */
454 regs.x.ax = 0x1708;
455 __dpmi_int(0x2f, &regs);
456 return regs.x.ax;
457}
458
459/* Compact clipboard data so that at least SIZE bytes is available. */
460unsigned
461clipboard_compact (Size)
462 unsigned Size;
463{
464 __dpmi_regs regs;
465
466 /* Calls Int 2Fh/AX=1709H with:
467 SI:CX = Desired memory size in bytes.
468 Return Values DX:AX == Number of bytes of largest block of free memory.
469 == 0 if error or no memory */
470 regs.x.ax = 0x1709;
471 regs.x.si = Size >> 16;
472 regs.x.cx = Size & 0xffff;
473 __dpmi_int(0x2f, &regs);
474 return ((unsigned)regs.x.dx << 16) | regs.x.ax;
475}
476\f
477static char no_mem_msg[] =
478 "(Not enough DOS memory to put saved text into clipboard.)";
0265f89f
EZ
479static char binary_msg[] =
480 "(Binary characters in saved text; clipboard data not set.)";
aae41d97
EZ
481static char system_error_msg[] =
482 "(Clipboard interface failure; clipboard data not set.)";
21cfcccf 483
767079a8 484DEFUN ("w16-set-clipboard-data", Fw16_set_clipboard_data, Sw16_set_clipboard_data, 1, 2, 0,
70da46c3
PJ
485 doc: /* This sets the clipboard data to the given text. */)
486 (string, frame)
487 Lisp_Object string, frame;
21cfcccf 488{
0265f89f 489 unsigned ok = 1, put_status = 0;
8de1855e 490 int nbytes, charset_info, no_crlf_conversion;
583f5d53 491 unsigned char *src, *dst = NULL;
21cfcccf 492
b7826503 493 CHECK_STRING (string);
3276b4fe 494
21cfcccf
EZ
495 if (NILP (frame))
496 frame = Fselected_frame ();
497
b7826503 498 CHECK_LIVE_FRAME (frame);
21cfcccf
EZ
499 if ( !FRAME_MSDOS_P (XFRAME (frame)))
500 goto done;
3276b4fe 501
21cfcccf
EZ
502 BLOCK_INPUT;
503
1b912a3b
EZ
504 if (!open_clipboard ())
505 goto error;
506
d5db4077
KR
507 nbytes = SBYTES (string);
508 src = SDATA (string);
583f5d53 509
9b317797
EZ
510 /* Do we need to encode this text? */
511 for (dst = src; dst < src + nbytes; dst++)
512 {
513 if (*dst == '\0' || *dst >= 0x80)
514 break;
515 }
516 if (dst >= src + nbytes)
583f5d53 517 {
9b317797 518 /* No multibyte characters in text. We need not encode it, but we
583f5d53
EZ
519 will have to convert it to DOS CR-LF style. */
520 no_crlf_conversion = 0;
9b317797 521 Vlast_coding_system_used = Qraw_text;
1b912a3b 522 dst = NULL; /* so we don't try to free a random pointer */
583f5d53
EZ
523 }
524 else
525 {
526 /* We must encode contents of STRING according to what
527 clipboard-coding-system specifies. */
528 int bufsize;
529 struct coding_system coding;
530 unsigned char *htext2;
9b317797
EZ
531 Lisp_Object coding_system =
532 NILP (Vnext_selection_coding_system) ?
533 Vselection_coding_system : Vnext_selection_coding_system;
583f5d53 534
9b317797
EZ
535 setup_coding_system (Fcheck_coding_system (coding_system), &coding);
536 coding.dst_bytes = nbytes * 4;
537 coding.destination = (unsigned char *) xmalloc (coding.dst_bytes);
9963e859 538 Vnext_selection_coding_system = Qnil;
583f5d53 539 coding.mode |= CODING_MODE_LAST_BLOCK;
9b317797
EZ
540 dst = coding.destination;
541 encode_coding_object (&coding, string, 0, 0,
542 SCHARS (string), nbytes, Qnil);
583f5d53 543 no_crlf_conversion = 1;
c7594627 544 nbytes = coding.produced;
9b317797 545 Vlast_coding_system_used = CODING_ID_NAME (coding.id);
ba92a470 546 src = dst;
583f5d53
EZ
547 }
548
583f5d53 549 ok = empty_clipboard ()
0265f89f 550 && ((put_status
ba92a470 551 = set_clipboard_data (CF_OEMTEXT, src, nbytes, no_crlf_conversion))
0265f89f 552 == 0);
583f5d53
EZ
553
554 if (!no_crlf_conversion)
21cfcccf 555 close_clipboard ();
3276b4fe 556
31354c30 557 if (ok) goto unblock;
21cfcccf
EZ
558
559 error:
3276b4fe 560
21cfcccf
EZ
561 ok = 0;
562
31354c30 563 unblock:
70fdbb46 564 xfree (dst);
31354c30
EZ
565 UNBLOCK_INPUT;
566
21cfcccf
EZ
567 /* Notify user if the text is too large to fit into DOS memory.
568 (This will happen somewhere after 600K bytes (470K in DJGPP v1.x),
569 depending on user system configuration.) If we just silently
570 fail the function, people might wonder why their text sometimes
571 doesn't make it to the clipboard. */
0265f89f 572 if (put_status)
21cfcccf 573 {
0265f89f
EZ
574 switch (put_status)
575 {
576 case 1:
577 message2 (no_mem_msg, sizeof (no_mem_msg) - 1, 0);
578 break;
579 case 2:
580 message2 (binary_msg, sizeof (binary_msg) - 1, 0);
581 break;
aae41d97
EZ
582 case 3:
583 message2 (system_error_msg, sizeof (system_error_msg) - 1, 0);
584 break;
0265f89f 585 }
b33e80aa 586 sit_for (make_number (2), 0, 2);
21cfcccf 587 }
3276b4fe 588
21cfcccf 589 done:
21cfcccf 590
0265f89f 591 return (ok && put_status == 0 ? string : Qnil);
21cfcccf
EZ
592}
593
767079a8 594DEFUN ("w16-get-clipboard-data", Fw16_get_clipboard_data, Sw16_get_clipboard_data, 0, 1, 0,
70da46c3 595 doc: /* This gets the clipboard data in text format. */)
21cfcccf
EZ
596 (frame)
597 Lisp_Object frame;
598{
599 unsigned data_size, truelen;
1b912a3b 600 unsigned char *htext = NULL;
21cfcccf 601 Lisp_Object ret = Qnil;
9b317797 602 int no_crlf_conversion, require_decoding = 0;
583f5d53 603
21cfcccf
EZ
604 if (NILP (frame))
605 frame = Fselected_frame ();
606
b7826503 607 CHECK_LIVE_FRAME (frame);
21cfcccf
EZ
608 if ( !FRAME_MSDOS_P (XFRAME (frame)))
609 goto done;
3276b4fe 610
21cfcccf 611 BLOCK_INPUT;
3276b4fe 612
21cfcccf 613 if (!open_clipboard ())
31354c30 614 goto unblock;
21cfcccf 615
538d05bb 616 if ((data_size = get_clipboard_data_size (CF_OEMTEXT)) == 0 ||
21cfcccf
EZ
617 (htext = (unsigned char *)xmalloc (data_size)) == 0)
618 goto closeclip;
619
620 /* need to know final size after '\r' chars are removed because
621 we can't change the string size manually, and doing an extra
622 copy is silly */
538d05bb 623 if ((truelen = get_clipboard_data (CF_OEMTEXT, htext, data_size, 0)) == 0)
21cfcccf
EZ
624 goto closeclip;
625
583f5d53 626 /* Do we need to decode it? */
3276b4fe
EZ
627 {
628 /* If the clipboard data contains any 8-bit Latin-1 code, we
629 need to decode it. */
630 int i;
631
632 for (i = 0; i < truelen; i++)
633 {
634 if (htext[i] >= 0x80)
635 {
9b317797 636 require_decoding = 1;
3276b4fe
EZ
637 break;
638 }
639 }
640 }
9b317797 641 if (require_decoding)
583f5d53
EZ
642 {
643 int bufsize;
644 unsigned char *buf;
645 struct coding_system coding;
9b317797 646 Lisp_Object coding_system = Vnext_selection_coding_system;
583f5d53 647
9b317797
EZ
648 truelen = get_clipboard_data (CF_OEMTEXT, htext, data_size, 1);
649 if (NILP (coding_system))
650 coding_system = Vselection_coding_system;
651 setup_coding_system (Fcheck_coding_system (coding_system), &coding);
652 coding.source = htext;
583f5d53 653 coding.mode |= CODING_MODE_LAST_BLOCK;
9b317797 654 /* We explicitly disable composition handling because selection
ee826e00 655 data should not contain any composition sequence. */
9b317797
EZ
656 coding.mode &= CODING_ANNOTATION_MASK;
657 decode_coding_object (&coding, Qnil, 0, 0, truelen, truelen, Qt);
658 ret = coding.dst_object;
659 Vlast_coding_system_used = CODING_ID_NAME (coding.id);
583f5d53
EZ
660 }
661 else
662 {
663 ret = make_unibyte_string ((char *) htext, truelen);
664 Vlast_coding_system_used = Qraw_text;
665 }
666
21cfcccf 667 xfree (htext);
9b317797 668 Vnext_selection_coding_system = Qnil;
21cfcccf
EZ
669
670 closeclip:
671 close_clipboard ();
31354c30
EZ
672
673 unblock:
674 UNBLOCK_INPUT;
8de1855e 675
21cfcccf 676 done:
8de1855e 677
21cfcccf
EZ
678 return (ret);
679}
680
681/* Support checking for a clipboard selection. */
682
683DEFUN ("x-selection-exists-p", Fx_selection_exists_p, Sx_selection_exists_p,
70da46c3
PJ
684 0, 1, 0,
685 doc: /* Whether there is an owner for the given X Selection.
686The arg should be the name of the selection in question, typically one of
687the symbols `PRIMARY', `SECONDARY', or `CLIPBOARD'.
688\(Those are literal upper-case symbol names, since that's what X expects.)
689For convenience, the symbol nil is the same as `PRIMARY',
690and t is the same as `SECONDARY'. */)
691 (selection)
21cfcccf
EZ
692 Lisp_Object selection;
693{
b7826503 694 CHECK_SYMBOL (selection);
21cfcccf
EZ
695
696 /* Return nil for SECONDARY selection. For PRIMARY (or nil)
697 selection, check if there is some text on the kill-ring;
698 for CLIPBOARD, check if the clipboard currently has valid
699 text format contents.
700
701 The test for killed text on the kill-ring emulates the Emacs
702 behavior on X, where killed text is also put into X selection
703 by the X interface code. (On MSDOS, killed text is only put
704 into the clipboard if we run under Windows, so we cannot check
705 the clipboard alone.) */
706 if ((EQ (selection, Qnil) || EQ (selection, QPRIMARY))
a97569cb
GM
707 && ! NILP (SYMBOL_VALUE (Fintern_soft (build_string ("kill-ring"),
708 Qnil))))
21cfcccf
EZ
709 return Qt;
710
711 if (EQ (selection, QCLIPBOARD))
712 {
713 Lisp_Object val = Qnil;
714
715 if (open_clipboard ())
716 {
538d05bb 717 if (get_clipboard_data_size (CF_OEMTEXT))
21cfcccf
EZ
718 val = Qt;
719 close_clipboard ();
720 }
721 return val;
722 }
723 return Qnil;
724}
725
8de1855e 726void
21cfcccf
EZ
727syms_of_win16select ()
728{
767079a8
EZ
729 defsubr (&Sw16_set_clipboard_data);
730 defsubr (&Sw16_get_clipboard_data);
21cfcccf
EZ
731 defsubr (&Sx_selection_exists_p);
732
199c7c44 733 DEFVAR_LISP ("selection-coding-system", &Vselection_coding_system,
70da46c3
PJ
734 doc: /* Coding system for communicating with other X clients.
735When sending or receiving text via cut_buffer, selection, and clipboard,
736the text is encoded or decoded by this coding system.
b45b1e81
JB
737The default value is `iso-latin-1-dos'. */);
738 Vselection_coding_system = intern ("iso-latin-1-dos");
9963e859
EZ
739
740 DEFVAR_LISP ("next-selection-coding-system", &Vnext_selection_coding_system,
70da46c3
PJ
741 doc: /* Coding system for the next communication with other X clients.
742Usually, `selection-coding-system' is used for communicating with
b1abeb71
JB
743other X clients. But, if this variable is set, it is used for the
744next communication only. After the communication, this variable is
70da46c3 745set to nil. */);
9963e859 746 Vnext_selection_coding_system = Qnil;
583f5d53 747
21cfcccf
EZ
748 QPRIMARY = intern ("PRIMARY"); staticpro (&QPRIMARY);
749 QCLIPBOARD = intern ("CLIPBOARD"); staticpro (&QCLIPBOARD);
750}
751
752#endif /* MSDOS */
6b61353c
KH
753
754/* arch-tag: 085a22c8-7324-436e-a6da-102464ce95d8
755 (do not change this comment) */