summaryrefslogtreecommitdiff
path: root/pith/context.c
blob: 1aae6c5676a174fd64fa438e3f436426afba9e85 (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
#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: context.c 1144 2008-08-14 16:53:34Z hubert@u.washington.edu $";
#endif

/*
 * ========================================================================
 * Copyright 2006-2007 University of Washington
 * Copyright 2013-2019 Eduardo Chappa
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * ========================================================================
 */

#include "../pith/headers.h"
#include "../pith/conf.h"
#include "../pith/context.h"
#include "../pith/state.h"
#include "../pith/status.h"
#include "../pith/stream.h"
#include "../pith/folder.h"
#include "../pith/util.h"
#include "../pith/tempfile.h"


/*
 * Internal prototypes
 */
char    *context_percent_quote(char *);


/* Context Manager context format digester
 * Accepts: context string and buffers for sprintf-suitable context,
 *          remote host (for display), remote context (for display), 
 *          and view string
 * Returns: NULL if successful, else error string
 *
 * Comments: OK, here's what we expect a fully qualified context to 
 *           look like:
 *
 * [*] [{host ["/"<proto>] [:port]}] [<cntxt>] "[" [<view>] "]" [<cntxt>]
 *
 *         2) It's understood that double "[" or "]" are used to 
 *            quote a literal '[' or ']' in a context name.
 *
 *         3) an empty view in context implies a view of '*', so that's 
 *            what get's put in the view string
 *
 *   The 2nd,3rd,4th, and 5th args all have length at least len.
 *
 */
char *
context_digest(char *context, char *scontext, char *host, char *rcontext,
	       char *view, size_t len)
{
    char *p, *viewp = view;
    char *scontextp = scontext;
    int   i = 0;

    if((p = context) == NULL || *p == '\0'){
	if(scontext)			/* so the caller can apply */
	  strncpy(scontext, "%s", len);	/* folder names as is.     */

	scontext[len-1] = '\0';
	return(NULL);			/* no error, just empty context */
    }

    /* find hostname if requested and exists */
    if(*p == '{' || (*p == '*' && *++p == '{')){
	for(p++; *p && *p != '}' ; p++)
	  if(host && p-context < len-1)
	    *host++ = *p;		/* copy host if requested */

	while(*p && *p != '}')		/* find end of imap host */
	  p++;

	if(*p == '\0')
	  return("Unbalanced '}'");	/* bogus. */
	else
	  p++;				/* move into next field */
    }

    for(; *p ; p++){			/* get thru context */
	if(rcontext && i < len-1)
	  rcontext[i] = *p;		/* copy if requested */
	
	i++;

	if(*p == '['){			/* done? */
	    if(*++p == '\0')		/* look ahead */
	      return("Unbalanced '['");

	    if(*p != '[')		/* not quoted: "[[" */
	      break;
	}
	else if(*p == ']' && *(p+1) == ']')	/* these may be quoted, too */
	  p++;
    }

    if(*p == '\0')
      return("No '[' in context");

    for(; *p ; p++){			/* possibly in view portion ? */
	if(*p == ']'){
	    if(*(p+1) == ']')		/* is quoted */
	      p++;
	    else
	      break;
	}

	if(viewp && viewp-view < len-1)
	  *viewp++ = *p;
    }

    if(*p != ']')
      return("No ']' in context");

    for(; *p ; p++){			/* trailing context ? */
	if(rcontext && i < len-1)
	  rcontext[i] = *p;
	i++;
    }

    if(host) *host = '\0';
    if(rcontext && i < len) rcontext[i] = '\0';
    if(viewp) {
/* MAIL_LIST: dealt with it in new_context since could be either '%' or '*'
	if(viewp == view && viewp-view < len-1)
	  *viewp++ = '*';
*/

	*viewp = '\0';
    }

    if(scontextp){			/* sprint'able context request ? */
	if(*context == '*'){
	    if(scontextp-scontext < len-1)
	      *scontextp++ = *context;

	    context++;
	}

	if(*context == '{'){
	    while(*context && *context != '}'){
		if(scontextp-scontext < len-1)
		  *scontextp++ = *context;
		
		context++;
	    }

	    *scontextp++ = '}';
	}

	for(p = rcontext; *p ; p++){
	    if(*p == '[' && *(p+1) == ']'){
		if(scontextp-scontext < len-2){
		    *scontextp++ = '%';	/* replace "[]" with "%s" */
		    *scontextp++ = 's';
		}

		p++;			/* skip ']' */
	    }
	    else if(scontextp-scontext < len-1)
	      *scontextp++ = *p;
	}

	*scontextp = '\0';
    }

    return(NULL);			/* no problems to report... */
}


/* Context Manager apply name to context
 * Accepts: buffer to write, context to apply, ambiguous folder name
 * Returns: buffer filled with fully qualified name in context
 *          No context applied if error
 */
char *
context_apply(char *b, CONTEXT_S *c, char *name, size_t len)
{
    if(!c || IS_REMOTE(name) ||
       (!IS_REMOTE(c->context) && is_absolute_path(name))){
	strncpy(b, name, len-1);			/* no context! */
    }
    else if(name[0] == '#'){
	if(IS_REMOTE(c->context)){
	    char *p = strchr(c->context, '}');	/* name specifies namespace */
	    snprintf(b, len, "%.*s", (int) MIN(p - c->context + 1, len-1), c->context);
	    b[MIN(p - c->context + 1, len-1)] = '\0';
	    snprintf(b+strlen(b), len-strlen(b), "%.*s", (int)(len-1-strlen(b)), name);
	}
	else{
	    strncpy(b, name, len-1);
	}
    }
    else if(c->dir && c->dir->ref){		/* has reference string! */
	snprintf(b, len, "%.*s", (int) len-1, c->dir->ref);
	b[len-1] = '\0';
	snprintf(b+strlen(b), len-strlen(b), "%.*s", (int) (len-1-strlen(b)), name);
    }
    else{					/* no ref, apply to context */
	char *pq = NULL;

	/*
	 * Have to quote %s for the sprintf because we're using context
	 * as a format string.
	 */
	pq = context_percent_quote(c->context);

	if(strlen(c->context) + strlen(name) < len)
	  snprintf(b, len, pq, name);
	else{
	    char *t;
	    size_t l;

	    l = strlen(pq)+strlen(name);
	    t = (char *) fs_get((l+1) * sizeof(char));
	    snprintf(t, l+1, pq, name);
	    strncpy(b, t, len-1);
	    fs_give((void **)&t);
	}

	if(pq)
	  fs_give((void **) &pq);
    }

    b[len-1] = '\0';
    return(b);
}


/*
 * Insert % before existing %'s so printf will print a real %.
 * This is a special routine just for contexts. It only does the % stuffing
 * for %'s inside of the braces of the context name, not for %'s to
 * the right of the braces, which we will be using for printf format strings.
 * Returns a malloced string which the caller is responsible for.
 */
char *
context_percent_quote(char *context)
{
    char *pq = NULL;

    if(!context || !*context)
      pq = cpystr("");
    else{
	if(IS_REMOTE(context)){
	    char *end, *p, *q;

	    /* don't worry about size efficiency, just allocate double */
	    pq = (char *) fs_get((2*strlen(context) + 1) * sizeof(char));

	    end = strchr(context, '}');
	    p = context;
	    q = pq;
	    while(*p){
		if(*p == '%' && p < end)
		  *q++ = '%';
		
		*q++ = *p++;
	    }

	    *q = '\0';
	}
	else
	  pq = cpystr(context);
    }

    return(pq);
}


/* Context Manager check if name is ambiguous
 * Accepts: candidate string
 * Returns: T if ambiguous, NIL if fully-qualified
 */

int
context_isambig (char *s)
{
    return(!(*s == '{' || *s == '#'));
}


/*----------------------------------------------------------------------
    Check to see if user is allowed to read or write this folder.

   Args:  s  -- the name to check
 
 Result: Returns 1 if OK
         Returns 0 and posts an error message if access is denied
  ----*/
int
context_allowed(char *s)
{
    struct variable *vars = ps_global ? ps_global->vars : NULL;
    int retval = 1;
    MAILSTREAM stream; /* fake stream for error message in mm_notify */

    if(ps_global
       && ps_global->restricted
       && (strindex("./~", s[0]) || srchstr(s, "/../"))){
	stream.mailbox = s;
	mm_notify(&stream, "Restricted mode doesn't allow operation", WARN);
	retval = 0;
    }
    else if(vars && VAR_OPER_DIR
	    && s[0] != '{' && !(s[0] == '*' && s[1] == '{')
	    && strucmp(s,ps_global->inbox_name) != 0
	    && strcmp(s, ps_global->VAR_INBOX_PATH) != 0){
	char *p, *free_this = NULL;

	p = s;
	if(strindex(s, '~')){
	    p = strindex(s, '~');
	    free_this = (char *)fs_get(strlen(p) + 200);
	    strncpy(free_this, p, strlen(p)+200);
	    fnexpand(free_this, strlen(p)+200);
	    p = free_this;
	}
	else if(p[0] != '/'){  /* add home dir to relative paths */
	    free_this = p = (char *)fs_get(strlen(s)
					    + strlen(ps_global->home_dir) + 2);
	    build_path(p, ps_global->home_dir, s,
		       strlen(s)+strlen(ps_global->home_dir)+2);
	}
	
	if(!in_dir(VAR_OPER_DIR, p)){
	    char err[200];

	    /* TRANSLATORS: User is restricted to operating within a certain directory */
	    snprintf(err, sizeof(err), _("Not allowed outside of %.150s"), VAR_OPER_DIR);
	    stream.mailbox = p;
	    mm_notify(&stream, err, WARN);
	    retval = 0;
	}
	else if(srchstr(p, "/../")){  /* check for .. in path */
	    stream.mailbox = p;
	    mm_notify(&stream, "\"..\" not allowed in name", WARN);
	    retval = 0;
	}

	if(free_this)
	  fs_give((void **)&free_this);
    }
    
    return retval;
}



/* Context Manager create mailbox
 * Accepts: context
 *	    mail stream
 *	    mailbox name to create
 * Returns: T on success, NIL on failure
 */

long
context_create (CONTEXT_S *context, MAILSTREAM *stream, char *mailbox)
{
  char tmp[MAILTMPLEN];		/* must be within context */

  return(context_allowed(context_apply(tmp, context, mailbox, sizeof(tmp)))
	 ? pine_mail_create(stream,tmp) : 0L);
}


/* Context Manager open
 * Accepts: context
 *	    candidate stream for recycling
 *	    mailbox name
 *	    open options
 * Returns: stream to use on success, NIL on failure
 */

MAILSTREAM *
context_open (CONTEXT_S *context, MAILSTREAM *old, char *name, long int opt, long int *retflags)
{
  char tmp[MAILTMPLEN];		/* build FQN from ambiguous name */

  if(!context_allowed(context_apply(tmp, context, name, sizeof(tmp)))){
      /*
       * If a stream is passed to context_open, we will either re-use
       * it or close it.
       */
      if(old)
	pine_mail_close(old);

      return((MAILSTREAM *)NULL);
  }

  return(pine_mail_open(old, tmp, opt, retflags));
}


/* Context Manager status
 * Accepts: context
 *	    candidate stream for recycling
 *	    mailbox name
 *	    open options
 * Returns: T if call succeeds, NIL on failure
 */

long
context_status(CONTEXT_S *context, MAILSTREAM *stream, char *name, long int opt)
{
    return(context_status_full(context, stream, name, opt, NULL, NULL));
}


long
context_status_full(CONTEXT_S *context, MAILSTREAM *stream, char *name,
		    long int opt, imapuid_t *uidvalidity, imapuid_t *uidnext)
{
    char tmp[MAILTMPLEN];	/* build FQN from ambiguous name */
    long flags = opt;

    return(context_allowed(context_apply(tmp, context, name, sizeof(tmp)))
	    ? pine_mail_status_full(stream,tmp,flags,uidvalidity,uidnext) : 0L);
}


/* Context Manager status
 *
 * This is very similar to context_status. Instead of a stream pointer we
 * receive a pointer to a pointer so that we can return a stream that we
 * opened for further use by the caller.
 *
 * Accepts: context
 *	    candidate stream for recycling
 *	    mailbox name
 *	    open options
 * Returns: T if call succeeds, NIL on failure
 */

long
context_status_streamp(CONTEXT_S *context, MAILSTREAM **streamp, char *name, long int opt)
{
    return(context_status_streamp_full(context,streamp,name,opt,NULL,NULL));
}


long
context_status_streamp_full(CONTEXT_S *context, MAILSTREAM **streamp, char *name,
			    long int opt, imapuid_t *uidvalidity, imapuid_t *uidnext)
{
    MAILSTREAM *stream;
    char        tmp[MAILTMPLEN];	/* build FQN from ambiguous name */

    if(!context_allowed(context_apply(tmp, context, name, sizeof(tmp))))
      return(0L);

    if(!streamp)
      stream = NULL;
    else{
	if(!*streamp && IS_REMOTE(tmp)){
	    *streamp = pine_mail_open(NULL, tmp,
				      OP_SILENT|OP_HALFOPEN|SP_USEPOOL, NULL);
	}

	stream = *streamp;
    }

    return(pine_mail_status_full(stream, tmp, opt, uidvalidity, uidnext));
}


/* Context Manager rename
 * Accepts: context
 *	    mail stream
 *	    old mailbox name
 *	    new mailbox name
 * Returns: T on success, NIL on failure
 */

long
context_rename (CONTEXT_S *context, MAILSTREAM *stream, char *old, char *new)
{
    char tmp[MAILTMPLEN],tmp2[MAILTMPLEN];

    return((context_allowed(context_apply(tmp, context, old, sizeof(tmp)))
	    && context_allowed(context_apply(tmp2, context, new, sizeof(tmp2))))
	     ? pine_mail_rename(stream,tmp,tmp2) : 0L);
}


MAILSTREAM *
context_already_open_stream(CONTEXT_S *context, char *name, int flags)
{
    char tmp[MAILTMPLEN];

    return(already_open_stream(context_apply(tmp, context, name, sizeof(tmp)),
			       flags));
}


/* Context Manager delete mailbox
 * Accepts: context
 *	    mail stream
 *	    mailbox name to delete
 * Returns: T on success, NIL on failure
 */

long
context_delete (CONTEXT_S *context, MAILSTREAM *stream, char *name)
{
    char tmp[MAILTMPLEN];		/* build FQN from ambiguous name */

    return(context_allowed(context_apply(tmp, context, name, sizeof(tmp)))
	     ? pine_mail_delete(stream, tmp) : 0L);
}


/* Context Manager append message string
 * Accepts: context
 *	    mail stream
 *	    destination mailbox
 *	    stringstruct of message to append
 * Returns: T on success, NIL on failure
 */

long
context_append (CONTEXT_S *context, MAILSTREAM *stream, char *name, STRING *msg)
{
    char tmp[MAILTMPLEN];	/* build FQN from ambiguous name */

    return(context_allowed(context_apply(tmp, context, name, sizeof(tmp)))
	     ? pine_mail_append(stream, tmp, msg) : 0L);
}


/* Context Manager append message string with flags
 * Accepts: context
 *	    mail stream
 *	    destination mailbox
 *          flags to assign message being appended
 *          date of message being appended
 *	    stringstruct of message to append
 * Returns: T on success, NIL on failure
 */

long
context_append_full(CONTEXT_S *context, MAILSTREAM *stream, char *name,
		    char *flags, char *date, STRING *msg)
{
    char tmp[MAILTMPLEN];		/* build FQN from ambiguous name */

    return(context_allowed(context_apply(tmp, context, name, sizeof(tmp)))
	     ? pine_mail_append_full(stream, tmp, flags, date, msg) : 0L);
}


/* Context Manager append multiple message
 * Accepts: context
 *	    mail stream
 *	    destination mailbox
 *	    append data callback
 *	    arbitrary ata for callback use
 * Returns: T on success, NIL on failure
 */

long
context_append_multiple(CONTEXT_S *context, MAILSTREAM *stream, char *name,
			append_t af, APPENDPACKAGE *data, MAILSTREAM *not_this_stream)
{
    char tmp[MAILTMPLEN];		/* build FQN from ambiguous name */

    return(context_allowed(context_apply(tmp, context, name, sizeof(tmp)))
     ? pine_mail_append_multiple(stream, tmp, af, data, not_this_stream) : 0L);
}


/* Mail copy message(s)
 * Accepts: context
 *	    mail stream
 *	    sequence
 *	    destination mailbox
 */

long
context_copy (CONTEXT_S *context, MAILSTREAM *stream, char *sequence, char *name)
{
    char *s, tmp[MAILTMPLEN];		/* build FQN from ambiguous name */

    tmp[0] = '\0';

    if(context_apply(tmp, context, name, sizeof(tmp))[0] == '{'){
	if((s = strindex(tmp, '}')) != NULL)
	  s++;
	else
	  return(0L);
    }
    else
      s = tmp;

    tmp[sizeof(tmp)-1] = '\0';

    if(!*s)
      strncpy(s = tmp, "INBOX", sizeof(tmp));		/* presume "inbox" ala c-client */

    tmp[sizeof(tmp)-1] = '\0';

    return(context_allowed(s) ? pine_mail_copy(stream, sequence, s) : 0L);
}


/*
 * Context manager stream usefulness test
 * Accepts: context
 *	    mail name
 *	    mailbox name
 *	    mail stream to test against mailbox name
 * Returns: stream if useful, else NIL
 */
MAILSTREAM *
context_same_stream(CONTEXT_S *context, char *name, MAILSTREAM *stream)
{
    extern MAILSTREAM *same_stream(char *name, MAILSTREAM *stream);
    char tmp[MAILTMPLEN];		/* build FQN from ambiguous name */

    return(same_stream(context_apply(tmp, context, name, sizeof(tmp)), stream));
}


/*
 * new_context - creates and fills in a new context structure, leaving
 *               blank the actual folder list (to be filled in later as
 *               needed).  Also, parses the context string provided 
 *               picking out any user defined label.  Context lines are
 *               of the form:
 *
 *               [ ["] <string> ["] <white-space>] <context>
 *
 */
CONTEXT_S *
new_context(char *cntxt_string, int *prime)
{
    CONTEXT_S  *c;
    char        host[MAXPATH], rcontext[MAXPATH],
		view[MAXPATH], dcontext[MAXPATH],
	       *nickname = NULL, *c_string = NULL, *p;

    /*
     * do any context string parsing (like splitting user-supplied 
     * label from actual context)...
     */
    get_pair(cntxt_string, &nickname, &c_string, 0, 0);

    if(update_bboard_spec(c_string, tmp_20k_buf, SIZEOF_20KBUF)){
	fs_give((void **) &c_string);
	c_string = cpystr(tmp_20k_buf);
    }

    if(c_string && *c_string == '\"')
      (void)removing_double_quotes(c_string);

    view[0] = rcontext[0] = host[0] = dcontext[0] = '\0';
    if((p = context_digest(c_string, dcontext, host, rcontext, view, MAXPATH)) != NULL){
	q_status_message2(SM_ORDER | SM_DING, 3, 4,
			  "Bad context, %.200s : %.200s", p, c_string);
	fs_give((void **) &c_string);
	if(nickname)
	  fs_give((void **)&nickname);

	return(NULL);
    }
    else
      fs_give((void **) &c_string);

    c = (CONTEXT_S *) fs_get(sizeof(CONTEXT_S)); /* get new context   */
    memset((void *) c, 0, sizeof(CONTEXT_S));	/* and initialize it */
    if(*host)
      c->server  = cpystr(host);		/* server + params */

    c->context = cpystr(dcontext);

    if(strstr(c->context, "#news."))
      c->use |= CNTXT_NEWS;

    c->dir = new_fdir(NULL, view, (c->use & CNTXT_NEWS) ? '*' : '%');

    /* fix up nickname */
    if(!(c->nickname = nickname)){			/* make one up! */
	snprintf(tmp_20k_buf, SIZEOF_20KBUF, "%s%s%.100s",
		(c->use & CNTXT_NEWS)
		  ? "News"
		  : (c->dir->ref)
		      ? (c->dir->ref) :"Mail",
		(c->server) ? " on " : "",
		(c->server) ? c->server : "");
	c->nickname = cpystr(tmp_20k_buf);
    }

    if(prime && !*prime){
	*prime = 1;
	c->use |= CNTXT_SAVEDFLT;
    }

    /* fix up label */
    if(NEWS_TEST(c)){
	snprintf(tmp_20k_buf, SIZEOF_20KBUF, "%sews groups%s%.100s",
		(*host) ? "N" : "Local n", (*host) ? " on " : "",
		(*host) ? host : "");
    }
    else{
	p = srchstr(rcontext, "[]");
	snprintf(tmp_20k_buf, SIZEOF_20KBUF, "%solders%s%.100s in %.*s%s",
		(*host) ? "F" : "Local f", (*host) ? " on " : "",
		(*host) ? host : "",
		p ? (int) MIN(p - rcontext, 100) : 0,
		rcontext, (p && (p - rcontext) > 0) ? "" : "home directory");
    }

    c->label = cpystr(tmp_20k_buf);

    dprint((5, "Context: %s serv:%s ref: %s view: %s\n",
	       c->context ? c->context : "?",
	       (c->server) ? c->server : "\"\"",
	       (c->dir->ref) ? c->dir->ref : "\"\"",
	       (c->dir->view.user) ? c->dir->view.user : "\"\""));

    return(c);
}


/*
 *  Release resources associated with global context list
 */
void
free_contexts(CONTEXT_S **ctxt)
{
    if(ctxt && *ctxt){
	free_contexts(&(*ctxt)->next);
	free_context(ctxt);
    }
}


/*
 *  Release resources associated with the given context structure
 */
void
free_context(CONTEXT_S **cntxt)
{
  if(cntxt && *cntxt){
    if(*cntxt == ps_global->context_current)
      ps_global->context_current = NULL;

    if(*cntxt == ps_global->context_last)
      ps_global->context_last = NULL;

    if(*cntxt == ps_global->last_save_context)
      ps_global->last_save_context = NULL;

    if((*cntxt)->context)
      fs_give((void **) &(*cntxt)->context);

    if((*cntxt)->server)
      fs_give((void **) &(*cntxt)->server);

    if((*cntxt)->nickname)
      fs_give((void **)&(*cntxt)->nickname);

    if((*cntxt)->label)
      fs_give((void **) &(*cntxt)->label);

    if((*cntxt)->comment)
      fs_give((void **) &(*cntxt)->comment);

    if((*cntxt)->selected.reference)
      fs_give((void **) &(*cntxt)->selected.reference);

    if((*cntxt)->selected.sub)
      free_selected(&(*cntxt)->selected.sub);

    free_strlist(&(*cntxt)->selected.folders);

    free_fdir(&(*cntxt)->dir, 1);

    fs_give((void **)cntxt);
  }
}