summaryrefslogtreecommitdiff
path: root/src/clientserver.c
blob: 7215aa7ffb1aac83a278349b01b858b79671a627 (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
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * clientserver.c: functions for Client Server functionality
 */

#include "vim.h"

#if defined(FEAT_CLIENTSERVER) || defined(PROTO)

static void cmdsrv_main(int *argc, char **argv, char_u *serverName_arg, char_u **serverStr);
static char_u *serverMakeName(char_u *arg, char *cmd);

/*
 * Replace termcodes such as <CR> and insert as key presses if there is room.
 */
    void
server_to_input_buf(char_u *str)
{
    char_u      *ptr = NULL;
    char_u      *cpo_save = p_cpo;

    // Set 'cpoptions' the way we want it.
    //    B set - backslashes are *not* treated specially
    //    k set - keycodes are *not* reverse-engineered
    //    < unset - <Key> sequences *are* interpreted
    //  The last but one parameter of replace_termcodes() is TRUE so that the
    //  <lt> sequence is recognised - needed for a real backslash.
    p_cpo = (char_u *)"Bk";
    str = replace_termcodes((char_u *)str, &ptr, REPTERM_DO_LT, NULL);
    p_cpo = cpo_save;

    if (*ptr != NUL)	// trailing CTRL-V results in nothing
    {
	/*
	 * Add the string to the input stream.
	 * Can't use add_to_input_buf() here, we now have K_SPECIAL bytes.
	 *
	 * First clear typed characters from the typeahead buffer, there could
	 * be half a mapping there.  Then append to the existing string, so
	 * that multiple commands from a client are concatenated.
	 */
	if (typebuf.tb_maplen < typebuf.tb_len)
	    del_typebuf(typebuf.tb_len - typebuf.tb_maplen, typebuf.tb_maplen);
	(void)ins_typebuf(str, REMAP_NONE, typebuf.tb_len, TRUE, FALSE);

	// Let input_available() know we inserted text in the typeahead
	// buffer.
	typebuf_was_filled = TRUE;
    }
    vim_free((char_u *)ptr);
}

/*
 * Evaluate an expression that the client sent to a string.
 */
    char_u *
eval_client_expr_to_string(char_u *expr)
{
    char_u	*res;
    int		save_dbl = debug_break_level;
    int		save_ro = redir_off;
    funccal_entry_T funccal_entry;
    int		did_save_funccal = FALSE;

    // Evaluate the expression at the toplevel, don't use variables local to
    // the calling function. Except when in debug mode.
    if (!debug_mode)
    {
	save_funccal(&funccal_entry);
	did_save_funccal = TRUE;
    }

     // Disable debugging, otherwise Vim hangs, waiting for "cont" to be
     // typed.
    debug_break_level = -1;
    redir_off = 0;
    // Do not display error message, otherwise Vim hangs, waiting for "cont"
    // to be typed.  Do generate errors so that try/catch works.
    ++emsg_silent;

    res = eval_to_string(expr, TRUE);

    debug_break_level = save_dbl;
    redir_off = save_ro;
    --emsg_silent;
    if (emsg_silent < 0)
	emsg_silent = 0;
    if (did_save_funccal)
	restore_funccal();

    // A client can tell us to redraw, but not to display the cursor, so do
    // that here.
    setcursor();
    out_flush_cursor(FALSE, FALSE);

    return res;
}

/*
 * Evaluate a command or expression sent to ourselves.
 */
    int
sendToLocalVim(char_u *cmd, int asExpr, char_u **result)
{
    if (asExpr)
    {
	char_u *ret;

	ret = eval_client_expr_to_string(cmd);
	if (result != NULL)
	{
	    if (ret == NULL)
	    {
		char	*err = _(e_invexprmsg);
		size_t	len = STRLEN(cmd) + STRLEN(err) + 5;
		char_u	*msg;

		msg = alloc(len);
		if (msg != NULL)
		    vim_snprintf((char *)msg, len, "%s: \"%s\"", err, cmd);
		*result = msg;
	    }
	    else
		*result = ret;
	}
	else
	    vim_free(ret);
	return ret == NULL ? -1 : 0;
    }
    server_to_input_buf(cmd);
    return 0;
}

/*
 * If conversion is needed, convert "data" from "client_enc" to 'encoding' and
 * return an allocated string.  Otherwise return "data".
 * "*tofree" is set to the result when it needs to be freed later.
 */
    char_u *
serverConvert(
    char_u *client_enc UNUSED,
    char_u *data,
    char_u **tofree)
{
    char_u	*res = data;

    *tofree = NULL;
    if (client_enc != NULL && p_enc != NULL)
    {
	vimconv_T	vimconv;

	vimconv.vc_type = CONV_NONE;
	if (convert_setup(&vimconv, client_enc, p_enc) != FAIL
					      && vimconv.vc_type != CONV_NONE)
	{
	    res = string_convert(&vimconv, data, NULL);
	    if (res == NULL)
		res = data;
	    else
		*tofree = res;
	}
	convert_setup(&vimconv, NULL, NULL);
    }
    return res;
}
#endif

#if (defined(FEAT_CLIENTSERVER) && !defined(NO_VIM_MAIN)) || defined(PROTO)

/*
 * Common code for the X command server and the Win32 command server.
 */

static char_u *build_drop_cmd(int filec, char **filev, int tabs, int sendReply);

/*
 * Do the client-server stuff, unless "--servername ''" was used.
 */
    void
exec_on_server(mparm_T *parmp)
{
    if (parmp->serverName_arg == NULL || *parmp->serverName_arg != NUL)
    {
# ifdef MSWIN
	// Initialise the client/server messaging infrastructure.
	serverInitMessaging();
# endif

	/*
	 * When a command server argument was found, execute it.  This may
	 * exit Vim when it was successful.  Otherwise it's executed further
	 * on.  Remember the encoding used here in "serverStrEnc".
	 */
	if (parmp->serverArg)
	{
	    cmdsrv_main(&parmp->argc, parmp->argv,
				    parmp->serverName_arg, &parmp->serverStr);
	    parmp->serverStrEnc = vim_strsave(p_enc);
	}

	// If we're still running, get the name to register ourselves.
	// On Win32 can register right now, for X11 need to setup the
	// clipboard first, it's further down.
	parmp->servername = serverMakeName(parmp->serverName_arg,
							      parmp->argv[0]);
# ifdef MSWIN
	if (parmp->servername != NULL)
	{
	    serverSetName(parmp->servername);
	    vim_free(parmp->servername);
	}
# endif
    }
}

/*
 * Prepare for running as a Vim server.
 */
    void
prepare_server(mparm_T *parmp)
{
# if defined(FEAT_X11)
    /*
     * Register for remote command execution with :serversend and --remote
     * unless there was a -X or a --servername '' on the command line.
     * Only register nongui-vim's with an explicit --servername argument,
     * or when compiling with autoservername.
     * When running as root --servername is also required.
     */
    if (X_DISPLAY != NULL && parmp->servername != NULL && (
#  if defined(FEAT_AUTOSERVERNAME) || defined(FEAT_GUI)
		(
#   if defined(FEAT_AUTOSERVERNAME)
		    1
#   else
		    gui.in_use
#   endif
#   ifdef UNIX
		 && getuid() != ROOT_UID
#   endif
		) ||
#  endif
		parmp->serverName_arg != NULL))
    {
	(void)serverRegisterName(X_DISPLAY, parmp->servername);
	vim_free(parmp->servername);
	TIME_MSG("register server name");
    }
    else
	serverDelayedStartName = parmp->servername;
# endif

    /*
     * Execute command ourselves if we're here because the send failed (or
     * else we would have exited above).
     */
    if (parmp->serverStr != NULL)
    {
	char_u *p;

	server_to_input_buf(serverConvert(parmp->serverStrEnc,
						       parmp->serverStr, &p));
	vim_free(p);
    }
}

    static void
cmdsrv_main(
    int		*argc,
    char	**argv,
    char_u	*serverName_arg,
    char_u	**serverStr)
{
    char_u	*res;
    int		i;
    char_u	*sname;
    int		ret;
    int		didone = FALSE;
    int		exiterr = 0;
    char	**newArgV = argv + 1;
    int		newArgC = 1,
		Argc = *argc;
    int		argtype;
#define ARGTYPE_OTHER		0
#define ARGTYPE_EDIT		1
#define ARGTYPE_EDIT_WAIT	2
#define ARGTYPE_SEND		3
    int		silent = FALSE;
    int		tabs = FALSE;
# ifndef FEAT_X11
    HWND	srv;
# else
    Window	srv;

    setup_term_clip();
# endif

    sname = serverMakeName(serverName_arg, argv[0]);
    if (sname == NULL)
	return;

    /*
     * Execute the command server related arguments and remove them
     * from the argc/argv array; We may have to return into main()
     */
    for (i = 1; i < Argc; i++)
    {
	res = NULL;
	if (STRCMP(argv[i], "--") == 0)	// end of option arguments
	{
	    for (; i < *argc; i++)
	    {
		*newArgV++ = argv[i];
		newArgC++;
	    }
	    break;
	}

	if (STRICMP(argv[i], "--remote-send") == 0)
	    argtype = ARGTYPE_SEND;
	else if (STRNICMP(argv[i], "--remote", 8) == 0)
	{
	    char	*p = argv[i] + 8;

	    argtype = ARGTYPE_EDIT;
	    while (*p != NUL)
	    {
		if (STRNICMP(p, "-wait", 5) == 0)
		{
		    argtype = ARGTYPE_EDIT_WAIT;
		    p += 5;
		}
		else if (STRNICMP(p, "-silent", 7) == 0)
		{
		    silent = TRUE;
		    p += 7;
		}
		else if (STRNICMP(p, "-tab", 4) == 0)
		{
		    tabs = TRUE;
		    p += 4;
		}
		else
		{
		    argtype = ARGTYPE_OTHER;
		    break;
		}
	    }
	}
	else
	    argtype = ARGTYPE_OTHER;

	if (argtype != ARGTYPE_OTHER)
	{
	    if (i == *argc - 1)
		mainerr_arg_missing((char_u *)argv[i]);
	    if (argtype == ARGTYPE_SEND)
	    {
		*serverStr = (char_u *)argv[i + 1];
		i++;
	    }
	    else
	    {
		*serverStr = build_drop_cmd(*argc - i - 1, argv + i + 1,
					  tabs, argtype == ARGTYPE_EDIT_WAIT);
		if (*serverStr == NULL)
		{
		    // Probably out of memory, exit.
		    didone = TRUE;
		    exiterr = 1;
		    break;
		}
		Argc = i;
	    }
# ifdef FEAT_X11
	    if (xterm_dpy == NULL)
	    {
		mch_errmsg(_("No display"));
		ret = -1;
	    }
	    else
		ret = serverSendToVim(xterm_dpy, sname, *serverStr,
						  NULL, &srv, 0, 0, 0, silent);
# else
	    // Win32 always works?
	    ret = serverSendToVim(sname, *serverStr, NULL, &srv, 0, 0, silent);
# endif
	    if (ret < 0)
	    {
		if (argtype == ARGTYPE_SEND)
		{
		    // Failed to send, abort.
		    mch_errmsg(_(": Send failed.\n"));
		    didone = TRUE;
		    exiterr = 1;
		}
		else if (!silent)
		    // Let vim start normally.
		    mch_errmsg(_(": Send failed. Trying to execute locally\n"));
		break;
	    }

# ifdef FEAT_GUI_MSWIN
	    // Guess that when the server name starts with "g" it's a GUI
	    // server, which we can bring to the foreground here.
	    // Foreground() in the server doesn't work very well.
	    if (argtype != ARGTYPE_SEND && TOUPPER_ASC(*sname) == 'G')
		SetForegroundWindow(srv);
# endif

	    /*
	     * For --remote-wait: Wait until the server did edit each
	     * file.  Also detect that the server no longer runs.
	     */
	    if (ret >= 0 && argtype == ARGTYPE_EDIT_WAIT)
	    {
		int	numFiles = *argc - i - 1;
		int	j;
		char_u  *done = alloc(numFiles);
		char_u  *p;
# ifdef FEAT_GUI_MSWIN
		NOTIFYICONDATA ni;
		int	count = 0;
		extern HWND message_window;
# endif

		if (numFiles > 0 && argv[i + 1][0] == '+')
		    // Skip "+cmd" argument, don't wait for it to be edited.
		    --numFiles;

# ifdef FEAT_GUI_MSWIN
		ni.cbSize = sizeof(ni);
		ni.hWnd = message_window;
		ni.uID = 0;
		ni.uFlags = NIF_ICON|NIF_TIP;
		ni.hIcon = LoadIcon((HINSTANCE)GetModuleHandle(0), "IDR_VIM");
		sprintf(ni.szTip, _("%d of %d edited"), count, numFiles);
		Shell_NotifyIcon(NIM_ADD, &ni);
# endif

		// Wait for all files to unload in remote
		vim_memset(done, 0, numFiles);
		while (memchr(done, 0, numFiles) != NULL)
		{
# ifdef MSWIN
		    p = serverGetReply(srv, NULL, TRUE, TRUE, 0);
		    if (p == NULL)
			break;
# else
		    if (serverReadReply(xterm_dpy, srv, &p, TRUE, -1) < 0)
			break;
# endif
		    j = atoi((char *)p);
		    if (j >= 0 && j < numFiles)
		    {
# ifdef FEAT_GUI_MSWIN
			++count;
			sprintf(ni.szTip, _("%d of %d edited"),
							     count, numFiles);
			Shell_NotifyIcon(NIM_MODIFY, &ni);
# endif
			done[j] = 1;
		    }
		}
# ifdef FEAT_GUI_MSWIN
		Shell_NotifyIcon(NIM_DELETE, &ni);
# endif
		vim_free(done);
	    }
	}
	else if (STRICMP(argv[i], "--remote-expr") == 0)
	{
	    if (i == *argc - 1)
		mainerr_arg_missing((char_u *)argv[i]);
# ifdef MSWIN
	    // Win32 always works?
	    if (serverSendToVim(sname, (char_u *)argv[i + 1],
						  &res, NULL, 1, 0, FALSE) < 0)
# else
	    if (xterm_dpy == NULL)
		mch_errmsg(_("No display: Send expression failed.\n"));
	    else if (serverSendToVim(xterm_dpy, sname, (char_u *)argv[i + 1],
					       &res, NULL, 1, 0, 1, FALSE) < 0)
# endif
	    {
		if (res != NULL && *res != NUL)
		{
		    // Output error from remote
		    mch_errmsg((char *)res);
		    VIM_CLEAR(res);
		}
		mch_errmsg(_(": Send expression failed.\n"));
	    }
	}
	else if (STRICMP(argv[i], "--serverlist") == 0)
	{
# ifdef MSWIN
	    // Win32 always works?
	    res = serverGetVimNames();
# else
	    if (xterm_dpy != NULL)
		res = serverGetVimNames(xterm_dpy);
# endif
	    if (did_emsg)
		mch_errmsg("\n");
	}
	else if (STRICMP(argv[i], "--servername") == 0)
	{
	    // Already processed. Take it out of the command line
	    i++;
	    continue;
	}
	else
	{
	    *newArgV++ = argv[i];
	    newArgC++;
	    continue;
	}
	didone = TRUE;
	if (res != NULL && *res != NUL)
	{
	    mch_msg((char *)res);
	    if (res[STRLEN(res) - 1] != '\n')
		mch_msg("\n");
	}
	vim_free(res);
    }

    if (didone)
    {
	display_errors();	// display any collected messages
	exit(exiterr);	// Mission accomplished - get out
    }

    // Return back into main()
    *argc = newArgC;
    vim_free(sname);
}

/*
 * Build a ":drop" command to send to a Vim server.
 */
    static char_u *
build_drop_cmd(
    int		filec,
    char	**filev,
    int		tabs,		// Use ":tab drop" instead of ":drop".
    int		sendReply)
{
    garray_T	ga;
    int		i;
    char_u	*inicmd = NULL;
    char_u	*p;
    char_u	*cdp;
    char_u	*cwd;

    if (filec > 0 && filev[0][0] == '+')
    {
	inicmd = (char_u *)filev[0] + 1;
	filev++;
	filec--;
    }
    // Check if we have at least one argument.
    if (filec <= 0)
	mainerr_arg_missing((char_u *)filev[-1]);

    // Temporarily cd to the current directory to handle relative file names.
    cwd = alloc(MAXPATHL);
    if (cwd == NULL)
	return NULL;
    if (mch_dirname(cwd, MAXPATHL) != OK)
    {
	vim_free(cwd);
	return NULL;
    }
    cdp = vim_strsave_escaped_ext(cwd,
#ifdef BACKSLASH_IN_FILENAME
	    (char_u *)"",  // rem_backslash() will tell what chars to escape
#else
	    PATH_ESC_CHARS,
#endif
	    '\\', TRUE);
    vim_free(cwd);
    if (cdp == NULL)
	return NULL;
    ga_init2(&ga, 1, 100);
    ga_concat(&ga, (char_u *)"<C-\\><C-N>:cd ");
    ga_concat(&ga, cdp);

    // Call inputsave() so that a prompt for an encryption key works.
    ga_concat(&ga, (char_u *)
		       "<CR>:if exists('*inputsave')|call inputsave()|endif|");
    if (tabs)
	ga_concat(&ga, (char_u *)"tab ");
    ga_concat(&ga, (char_u *)"drop");
    for (i = 0; i < filec; i++)
    {
	// On Unix the shell has already expanded the wildcards, don't want to
	// do it again in the Vim server.  On MS-Windows only escape
	// non-wildcard characters.
	p = vim_strsave_escaped((char_u *)filev[i],
#ifdef UNIX
		PATH_ESC_CHARS
#else
		(char_u *)" \t%#"
#endif
		);
	if (p == NULL)
	{
	    vim_free(ga.ga_data);
	    return NULL;
	}
	ga_concat(&ga, (char_u *)" ");
	ga_concat(&ga, p);
	vim_free(p);
    }
    ga_concat(&ga, (char_u *)
		  "|if exists('*inputrestore')|call inputrestore()|endif<CR>");

    // The :drop commands goes to Insert mode when 'insertmode' is set, use
    // CTRL-\ CTRL-N again.
    ga_concat(&ga, (char_u *)"<C-\\><C-N>");

    // Switch back to the correct current directory (prior to temporary path
    // switch) unless 'autochdir' is set, in which case it will already be
    // correct after the :drop command. With line breaks and spaces:
    //  if !exists('+acd') || !&acd
    //    if haslocaldir()
    //	    cd -
    //      lcd -
    //    elseif getcwd() ==# 'current path'
    //      cd -
    //    endif
    //  endif
    ga_concat(&ga, (char_u *)":if !exists('+acd')||!&acd|if haslocaldir()|");
    ga_concat(&ga, (char_u *)"cd -|lcd -|elseif getcwd() ==# '");
    ga_concat(&ga, cdp);
    ga_concat(&ga, (char_u *)"'|cd -|endif|endif<CR>");
    vim_free(cdp);

    if (sendReply)
	ga_concat(&ga, (char_u *)":call SetupRemoteReplies()<CR>");
    ga_concat(&ga, (char_u *)":");
    if (inicmd != NULL)
    {
	// Can't use <CR> after "inicmd", because an "startinsert" would cause
	// the following commands to be inserted as text.  Use a "|",
	// hopefully "inicmd" does allow this...
	ga_concat(&ga, inicmd);
	ga_concat(&ga, (char_u *)"|");
    }
    // Bring the window to the foreground, goto Insert mode when 'im' set and
    // clear command line.
    ga_concat(&ga, (char_u *)"cal foreground()|if &im|star|en|redr|f<CR>");
    ga_append(&ga, NUL);
    return ga.ga_data;
}

/*
 * Make our basic server name: use the specified "arg" if given, otherwise use
 * the tail of the command "cmd" we were started with.
 * Return the name in allocated memory.  This doesn't include a serial number.
 */
    static char_u *
serverMakeName(char_u *arg, char *cmd)
{
    char_u *p;

    if (arg != NULL && *arg != NUL)
	p = vim_strsave_up(arg);
    else
    {
	p = vim_strsave_up(gettail((char_u *)cmd));
	// Remove .exe or .bat from the name.
	if (p != NULL && vim_strchr(p, '.') != NULL)
	    *vim_strchr(p, '.') = NUL;
    }
    return p;
}
#endif // FEAT_CLIENTSERVER

#if defined(FEAT_CLIENTSERVER) && defined(FEAT_X11)
    static void
make_connection(void)
{
    if (X_DISPLAY == NULL
# ifdef FEAT_GUI
	    && !gui.in_use
# endif
	    )
    {
	x_force_connect = TRUE;
	setup_term_clip();
	x_force_connect = FALSE;
    }
}

    static int
check_connection(void)
{
    make_connection();
    if (X_DISPLAY == NULL)
    {
	emsg(_("E240: No connection to the X server"));
	return FAIL;
    }
    return OK;
}
#endif

#ifdef FEAT_CLIENTSERVER
    static void
remote_common(typval_T *argvars, typval_T *rettv, int expr)
{
    char_u	*server_name;
    char_u	*keys;
    char_u	*r = NULL;
    char_u	buf[NUMBUFLEN];
    int		timeout = 0;
# ifdef MSWIN
    HWND	w;
# else
    Window	w;
# endif

    if (check_restricted() || check_secure())
	return;

# ifdef FEAT_X11
    if (check_connection() == FAIL)
	return;
# endif
    if (argvars[2].v_type != VAR_UNKNOWN
	    && argvars[3].v_type != VAR_UNKNOWN)
	timeout = tv_get_number(&argvars[3]);

    server_name = tv_get_string_chk(&argvars[0]);
    if (server_name == NULL)
	return;		// type error; errmsg already given
    keys = tv_get_string_buf(&argvars[1], buf);
# ifdef MSWIN
    if (serverSendToVim(server_name, keys, &r, &w, expr, timeout, TRUE) < 0)
# else
    if (serverSendToVim(X_DISPLAY, server_name, keys, &r, &w, expr, timeout,
								  0, TRUE) < 0)
# endif
    {
	if (r != NULL)
	{
	    emsg((char *)r);	// sending worked but evaluation failed
	    vim_free(r);
	}
	else
	    semsg(_("E241: Unable to send to %s"), server_name);
	return;
    }

    rettv->vval.v_string = r;

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	dictitem_T	v;
	char_u		str[30];
	char_u		*idvar;

	idvar = tv_get_string_chk(&argvars[2]);
	if (idvar != NULL && *idvar != NUL)
	{
	    sprintf((char *)str, PRINTF_HEX_LONG_U, (long_u)w);
	    v.di_tv.v_type = VAR_STRING;
	    v.di_tv.vval.v_string = vim_strsave(str);
	    set_var(idvar, &v.di_tv, FALSE);
	    vim_free(v.di_tv.vval.v_string);
	}
    }
}
#endif

#if defined(FEAT_EVAL) || defined(PROTO)
/*
 * "remote_expr()" function
 */
    void
f_remote_expr(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_CLIENTSERVER
    remote_common(argvars, rettv, TRUE);
#endif
}

/*
 * "remote_foreground()" function
 */
    void
f_remote_foreground(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_CLIENTSERVER
# ifdef MSWIN
    // On Win32 it's done in this application.
    {
	char_u	*server_name = tv_get_string_chk(&argvars[0]);

	if (server_name != NULL)
	    serverForeground(server_name);
    }
# else
    // Send a foreground() expression to the server.
    argvars[1].v_type = VAR_STRING;
    argvars[1].vval.v_string = vim_strsave((char_u *)"foreground()");
    argvars[2].v_type = VAR_UNKNOWN;
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
    remote_common(argvars, rettv, TRUE);
    vim_free(argvars[1].vval.v_string);
# endif
#endif
}

    void
f_remote_peek(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CLIENTSERVER
    dictitem_T	v;
    char_u	*s = NULL;
# ifdef MSWIN
    long_u	n = 0;
# endif
    char_u	*serverid;

    if (check_restricted() || check_secure())
    {
	rettv->vval.v_number = -1;
	return;
    }
    serverid = tv_get_string_chk(&argvars[0]);
    if (serverid == NULL)
    {
	rettv->vval.v_number = -1;
	return;		// type error; errmsg already given
    }
# ifdef MSWIN
    sscanf((const char *)serverid, SCANF_HEX_LONG_U, &n);
    if (n == 0)
	rettv->vval.v_number = -1;
    else
    {
	s = serverGetReply((HWND)n, FALSE, FALSE, FALSE, 0);
	rettv->vval.v_number = (s != NULL);
    }
# else
    if (check_connection() == FAIL)
	return;

    rettv->vval.v_number = serverPeekReply(X_DISPLAY,
						serverStrToWin(serverid), &s);
# endif

    if (argvars[1].v_type != VAR_UNKNOWN && rettv->vval.v_number > 0)
    {
	char_u		*retvar;

	v.di_tv.v_type = VAR_STRING;
	v.di_tv.vval.v_string = vim_strsave(s);
	retvar = tv_get_string_chk(&argvars[1]);
	if (retvar != NULL)
	    set_var(retvar, &v.di_tv, FALSE);
	vim_free(v.di_tv.vval.v_string);
    }
#else
    rettv->vval.v_number = -1;
#endif
}

    void
f_remote_read(typval_T *argvars UNUSED, typval_T *rettv)
{
    char_u	*r = NULL;

#ifdef FEAT_CLIENTSERVER
    char_u	*serverid = tv_get_string_chk(&argvars[0]);

    if (serverid != NULL && !check_restricted() && !check_secure())
    {
	int timeout = 0;
# ifdef MSWIN
	// The server's HWND is encoded in the 'id' parameter
	long_u		n = 0;
# endif

	if (argvars[1].v_type != VAR_UNKNOWN)
	    timeout = tv_get_number(&argvars[1]);

# ifdef MSWIN
	sscanf((char *)serverid, SCANF_HEX_LONG_U, &n);
	if (n != 0)
	    r = serverGetReply((HWND)n, FALSE, TRUE, TRUE, timeout);
	if (r == NULL)
# else
	if (check_connection() == FAIL
		|| serverReadReply(X_DISPLAY, serverStrToWin(serverid),
						       &r, FALSE, timeout) < 0)
# endif
	    emsg(_("E277: Unable to read a server reply"));
    }
#endif
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = r;
}

/*
 * "remote_send()" function
 */
    void
f_remote_send(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_CLIENTSERVER
    remote_common(argvars, rettv, FALSE);
#endif
}

/*
 * "remote_startserver()" function
 */
    void
f_remote_startserver(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_CLIENTSERVER
    char_u	*server = tv_get_string_chk(&argvars[0]);

    if (server == NULL)
	return;		// type error; errmsg already given
    if (serverName != NULL)
	emsg(_("E941: already started a server"));
    else
    {
# ifdef FEAT_X11
	if (check_connection() == OK)
	    serverRegisterName(X_DISPLAY, server);
# else
	serverSetName(server);
# endif
    }
#else
    emsg(_("E942: +clientserver feature not available"));
#endif
}

    void
f_server2client(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CLIENTSERVER
    char_u	buf[NUMBUFLEN];
    char_u	*server = tv_get_string_chk(&argvars[0]);
    char_u	*reply = tv_get_string_buf_chk(&argvars[1], buf);

    rettv->vval.v_number = -1;
    if (server == NULL || reply == NULL)
	return;
    if (check_restricted() || check_secure())
	return;
# ifdef FEAT_X11
    if (check_connection() == FAIL)
	return;
# endif

    if (serverSendReply(server, reply) < 0)
    {
	emsg(_("E258: Unable to send to client"));
	return;
    }
    rettv->vval.v_number = 0;
#else
    rettv->vval.v_number = -1;
#endif
}

    void
f_serverlist(typval_T *argvars UNUSED, typval_T *rettv)
{
    char_u	*r = NULL;

#ifdef FEAT_CLIENTSERVER
# ifdef MSWIN
    r = serverGetVimNames();
# else
    make_connection();
    if (X_DISPLAY != NULL)
	r = serverGetVimNames(X_DISPLAY);
# endif
#endif
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = r;
}
#endif