summaryrefslogtreecommitdiff
path: root/imap/src/osdep/dos/bezrkdos.c
blob: ab3e9fd068dde08ede0c279c76ba1e58465a4c21 (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
/* ========================================================================
 * Copyright 1988-2006 University of Washington
 *
 * 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
 *
 * 
 * ========================================================================
 */

/*
 * Program:	Berkeley mail routines
 *
 * Author:	Mark Crispin
 *		Networks and Distributed Computing
 *		Computing & Communications
 *		University of Washington
 *		Administration Building, AG-44
 *		Seattle, WA  98195
 *		Internet: MRC@CAC.Washington.EDU
 *
 * Date:	24 June 1992
 * Last Edited:	30 August 2006
 */


/* Dedication:
 *  This file is dedicated with affection to those Merry Marvels of Musical
 * Madness . . .
 *  ->  The Incomparable Leland Stanford Junior University Marching Band  <-
 * who entertain, awaken, and outrage Stanford fans in the fact of repeated
 * losing seasons and shattered Rose Bowl dreams [Cardinal just don't have
 * HUSKY FEVER!!!].
 *
 */

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include "mail.h"
#include "osdep.h"
#include <time.h>
#include <sys\stat.h>
#include <dos.h>
#include "rfc822.h"
#include "dummy.h"
#include "misc.h"
#include "fdstring.h"

/* Berkeley I/O stream local data */
	
typedef struct bezerk_local {
  int fd;			/* file descriptor for I/O */
  off_t filesize;		/* file size parsed */
  char *buf;			/* temporary buffer */
} BEZERKLOCAL;


/* Convenient access to local data */

#define LOCAL ((BEZERKLOCAL *) stream->local)

/* Function prototypes */

DRIVER *bezerk_valid (char *name);
long bezerk_isvalid (char *name,char *tmp);
int bezerk_valid_line (char *s,char **rx,int *rzn);
void *bezerk_parameters (long function,void *value);
void bezerk_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
void bezerk_list (MAILSTREAM *stream,char *ref,char *pat);
void bezerk_lsub (MAILSTREAM *stream,char *ref,char *pat);
long bezerk_create (MAILSTREAM *stream,char *mailbox);
long bezerk_delete (MAILSTREAM *stream,char *mailbox);
long bezerk_rename (MAILSTREAM *stream,char *old,char *newname);
MAILSTREAM *bezerk_open (MAILSTREAM *stream);
void bezerk_close (MAILSTREAM *stream,long options);
char *bezerk_header (MAILSTREAM *stream,unsigned long msgno,
		     unsigned long *length,long flags);
long bezerk_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,
		  long flags);
long bezerk_ping (MAILSTREAM *stream);
void bezerk_check (MAILSTREAM *stream);
long bezerk_expunge (MAILSTREAM *stream,char *sequence,long options);
long bezerk_copy (MAILSTREAM *stream,char *sequence,char *mailbox,
		  long options);
long bezerk_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
int bezerk_append_msg (MAILSTREAM *stream,FILE *sf,char *flags,char *date,
		     STRING *msg);
void bezerk_gc (MAILSTREAM *stream,long gcflags);
char *bezerk_file (char *dst,char *name);
long bezerk_badname (char *tmp,char *s);
long bezerk_parse (MAILSTREAM *stream);
unsigned long bezerk_hdrpos (MAILSTREAM *stream,unsigned long msgno,
			     unsigned long *size);

/* Berkeley mail routines */


/* Driver dispatch used by MAIL */

DRIVER bezerkdriver = {
  "bezerk",			/* driver name */
				/* driver flags */
  DR_LOCAL|DR_MAIL|DR_LOWMEM|DR_CRLF|DR_NOSTICKY,
  (DRIVER *) NIL,		/* next driver */
  bezerk_valid,			/* mailbox is valid for us */
  bezerk_parameters,		/* manipulate parameters */
  bezerk_scan,			/* scan mailboxes */
  bezerk_list,			/* list mailboxes */
  bezerk_lsub,			/* list subscribed mailboxes */
  NIL,				/* subscribe to mailbox */
  NIL,				/* unsubscribe from mailbox */
  bezerk_create,		/* create mailbox */
  bezerk_delete,		/* delete mailbox */
  bezerk_rename,		/* rename mailbox */
  mail_status_default,		/* status of mailbox */
  bezerk_open,			/* open mailbox */
  bezerk_close,			/* close mailbox */
  NIL,				/* fetch message "fast" attributes */
  NIL,				/* fetch message flags */
  NIL,				/* fetch overview */
  NIL,				/* fetch message envelopes */
  bezerk_header,		/* fetch message header */
  bezerk_text,			/* fetch message text */
  NIL,				/* fetch partial message text */
  NIL,				/* unique identifier */
  NIL,				/* message number */
  NIL,				/* modify flags */
  NIL,				/* per-message modify flags */
  NIL,				/* search for message based on criteria */
  NIL,				/* sort messages */
  NIL,				/* thread messages */
  bezerk_ping,			/* ping mailbox to see if still alive */
  bezerk_check,			/* check for new messages */
  bezerk_expunge,		/* expunge deleted messages */
  bezerk_copy,			/* copy messages to another mailbox */
  bezerk_append,		/* append string message to mailbox */
  NIL				/* garbage collect stream */
};

				/* prototype stream */
MAILSTREAM bezerkproto = {&bezerkdriver};

/* Berkeley mail validate mailbox
 * Accepts: mailbox name
 * Returns: our driver if name is valid, NIL otherwise
 */

DRIVER *bezerk_valid (char *name)
{
  char tmp[MAILTMPLEN];
  return bezerk_isvalid (name,tmp) ? &bezerkdriver : (DRIVER *) NIL;
}


/* Berkeley mail test for valid mailbox
 * Accepts: mailbox name
 * Returns: T if valid, NIL otherwise
 */

long bezerk_isvalid (char *name,char *tmp)
{
  int fd;
  long ret = NIL;
  struct stat sbuf;
  errno = EINVAL;		/* assume invalid argument */
				/* if file, get its status */
  if ((*name != '{') && mailboxfile (tmp,name) && !stat (tmp,&sbuf)) {
    if (!sbuf.st_size)errno = 0;/* empty file */
    else if ((fd = open (tmp,O_BINARY|O_RDONLY,NIL)) >= 0) {
      memset (tmp,'\0',MAILTMPLEN);
      errno = -1;		/* in case bezerk_valid_line fails */
      if (read (fd,tmp,MAILTMPLEN-1) >= 0)
	ret = bezerk_valid_line (tmp,NIL,NIL);
      close (fd);		/* close the file */
    }
  }
				/* in case INBOX but not bezerk format */
  else if ((errno == ENOENT) && ((name[0] == 'I') || (name[0] == 'i')) &&
	   ((name[1] == 'N') || (name[1] == 'n')) &&
	   ((name[2] == 'B') || (name[2] == 'b')) &&
	   ((name[3] == 'O') || (name[3] == 'o')) &&
	   ((name[4] == 'X') || (name[4] == 'x')) && !name[5]) errno = -1;
  return ret;			/* return what we should */
}

/* Validate line
 * Accepts: pointer to candidate string to validate as a From header
 *	    return pointer to end of date/time field
 *	    return pointer to offset from t of time (hours of ``mmm dd hh:mm'')
 *	    return pointer to offset from t of time zone (if non-zero)
 * Returns: t,ti,zn set if valid From string, else ti is NIL
 */

int bezerk_valid_line (char *s,char **rx,int *rzn)
{
  char *x;
  int zn;
  int ti = 0;
				/* line must begin with "From " */
  if ((*s != 'F') || (s[1] != 'r') || (s[2] != 'o') || (s[3] != 'm') ||
	(s[4] != ' ')) return NIL;
				/* find end of line */
  for (x = s + 5; *x && *x != '\012'; x++);
  if (!x) return NIL;		/* end of line not found */
  if (x[-1] == '\015') x--;	/* ignore CR */
  if ((x - s < 27)) return NIL;	/* line too short */
  if (x - s >= 41) {		/* possible search for " remote from " */
    for (zn = -1; x[zn] != ' '; zn--);
    if ((x[zn-1] == 'm') && (x[zn-2] == 'o') && (x[zn-3] == 'r') &&
	(x[zn-4] == 'f') && (x[zn-5] == ' ') && (x[zn-6] == 'e') &&
	(x[zn-7] == 't') && (x[zn-8] == 'o') && (x[zn-9] == 'm') &&
	(x[zn-10] == 'e') && (x[zn-11] == 'r') && (x[zn-12] == ' '))
      x += zn - 12;
  }
  if (x[-5] == ' ') {		/* ends with year? */
				/* no timezone? */
    if (x[-8] == ':') zn = 0,ti = -5;
				/* three letter timezone? */
    else if (x[-9] == ' ') ti = zn = -9;
				/* numeric timezone? */
    else if ((x[-11]==' ') && ((x[-10]=='+') || (x[-10]=='-'))) ti = zn = -11;
  }
  else if (x[-4] == ' ') {	/* no year and three leter timezone? */
    if (x[-9] == ' ') zn = -4,ti = -9;
  }
  else if (x[-6] == ' ') {	/* no year and numeric timezone? */
    if ((x[-11] == ' ') && ((x[-5] == '+') || (x[-5] == '-')))
      zn = -6,ti = -11;
  }
				/* time must be www mmm dd hh:mm[:ss] */
  if (ti && !((x[ti - 3] == ':') &&
	      (x[ti -= ((x[ti - 6] == ':') ? 9 : 6)] == ' ') &&
	      (x[ti - 3] == ' ') && (x[ti - 7] == ' ') &&
	      (x[ti - 11] == ' '))) return NIL;
  if (rx) *rx = x;		/* set return values */
  if (rzn) *rzn = zn;
  return ti;
}

/* Berkeley manipulate driver parameters
 * Accepts: function code
 *	    function-dependent value
 * Returns: function-dependent return value
 */

void *bezerk_parameters (long function,void *value)
{
  return NIL;
}


/* Berkeley mail scan mailboxes
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 *	    string to scan
 */

void bezerk_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
{
  if (stream) dummy_scan (NIL,ref,pat,contents);
}


/* Berkeley mail list mailboxes
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 */

void bezerk_list (MAILSTREAM *stream,char *ref,char *pat)
{
  if (stream) dummy_list (stream,ref,pat);
}


/* Berkeley mail list subscribed mailboxes
 * Accepts: mail stream
 *	    reference
 *	    pattern to search
 */

void bezerk_lsub (MAILSTREAM *stream,char *ref,char *pat)
{
  if (stream) dummy_lsub (stream,ref,pat);
}

/* Berkeley mail create mailbox
 * Accepts: MAIL stream
 *	    mailbox name to create
 * Returns: T on success, NIL on failure
 */

long bezerk_create (MAILSTREAM *stream,char *mailbox)
{
  return dummy_create (stream,mailbox);
}


/* Berkeley mail delete mailbox
 * Accepts: MAIL stream
 *	    mailbox name to delete
 * Returns: T on success, NIL on failure
 */

long bezerk_delete (MAILSTREAM *stream,char *mailbox)
{
  return dummy_delete (stream,mailbox);
}


/* Berkeley mail rename mailbox
 * Accepts: MAIL stream
 *	    old mailbox name
 *	    new mailbox name (or NIL for delete)
 * Returns: T on success, NIL on failure
 */

long bezerk_rename (MAILSTREAM *stream,char *old,char *newname)
{
  return dummy_rename (stream,old,newname);
}

/* Berkeley mail open
 * Accepts: stream to open
 * Returns: stream on success, NIL on failure
 */

MAILSTREAM *bezerk_open (MAILSTREAM *stream)
{
  long i;
  int fd;
  char *s;
  char tmp[MAILTMPLEN];
				/* return prototype for OP_PROTOTYPE call */
  if (!stream) return &bezerkproto;
  if (stream->local) fatal ("bezerk recycle stream");
  if (!mailboxfile (tmp,stream->mailbox))
    return (MAILSTREAM *) bezerk_badname (tmp,stream->mailbox);
  if (((fd = open (tmp,O_BINARY|O_RDONLY,NIL)) < 0)) {
    sprintf (tmp,"Can't open mailbox: %s",strerror (errno));
    mm_log (tmp,ERROR);
    return NIL;
  }
  stream->rdonly = T;		/* this driver is readonly */
  stream->local = fs_get (sizeof (BEZERKLOCAL));
				/* canonicalize the stream mailbox name */
  fs_give ((void **) &stream->mailbox);
  if (s = strchr ((s = strrchr (tmp,'\\')) ? s : tmp,'.')) *s = '\0';
  stream->mailbox = cpystr (tmp);
  LOCAL->fd = fd;		/* note the file */
  LOCAL->filesize = 0;		/* initialize parsed file size */
  LOCAL->buf = NIL;		/* initially no local buffer */
  stream->sequence++;		/* bump sequence number */
  stream->uid_validity = time (0);
				/* parse mailbox */
  stream->nmsgs = stream->recent = 0;
  if (!bezerk_ping (stream)) return NIL;
  if (!stream->nmsgs) mm_log ("Mailbox is empty",(long) NIL);
  stream->perm_seen = stream->perm_deleted =
    stream->perm_flagged = stream->perm_answered = stream->perm_draft = NIL;
  stream->perm_user_flags = NIL;
  return stream;		/* return stream to caller */
}

/* Berkeley mail close
 * Accepts: MAIL stream
 *	    close options
 */

void bezerk_close (MAILSTREAM *stream,long options)
{
  if (stream && LOCAL) {	/* only if a file is open */
    int silent = stream->silent;
    stream->silent = T;
    if (options & CL_EXPUNGE) bezerk_expunge (stream,NIL,NIL);
    close (LOCAL->fd);		/* close the local file */
    if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
				/* nuke the local data */
    fs_give ((void **) &stream->local);
    stream->dtb = NIL;		/* log out the DTB */
  }
}

/* Berkeley mail fetch message header
 * Accepts: MAIL stream
 *	    message # to fetch
 *	    pointer to returned header text length
 *	    option flags
 * Returns: message header in RFC822 format
 */

char *bezerk_header (MAILSTREAM *stream,unsigned long msgno,
		     unsigned long *length,long flags)
{
  char tmp[MAILTMPLEN];
  *length = 0;			/* default to empty */
  if (flags & FT_UID) return "";/* UID call "impossible" */
				/* get to header position */
  lseek (LOCAL->fd,bezerk_hdrpos (stream,msgno,length),L_SET);
				/* is buffer big enough? */
  if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
  LOCAL->buf = (char *) fs_get ((size_t) *length + 1);
  LOCAL->buf[*length] = '\0';	/* tie off string */
				/* slurp the data */
  read (LOCAL->fd,LOCAL->buf,(size_t) *length);
  return LOCAL->buf;
}


/* Berkeley mail fetch message text (body only)
 * Accepts: MAIL stream
 *	    message # to fetch
 *	    pointer to returned header text length
 *	    option flags
 * Returns: T, always
 */

long bezerk_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
  MESSAGECACHE *elt;
  FDDATA d;
  unsigned long hdrsize,hdrpos;
				/* UID call "impossible" */
  if (flags & FT_UID) return NIL;
  elt = mail_elt (stream,msgno);/* if message not seen */
				/* mark message as seen */
  if (elt->seen && !(flags & FT_PEEK)) {
    elt->seen = T;
    mm_flags (stream,msgno);
  }
				/* get location of text data */
  hdrpos = bezerk_hdrpos (stream,msgno,&hdrsize);
  d.fd = LOCAL->fd;		/* set initial stringstruct */
  d.pos = hdrpos + hdrsize;
				/* flush old buffer */
  if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
  d.chunk = LOCAL->buf = (char *) fs_get ((size_t) d.chunksize = CHUNKSIZE);
  INIT (bs,fd_string,(void *) &d,elt->rfc822_size - hdrsize);
  return T;			/* success */
}

/* Berkeley mail ping mailbox
 * Accepts: MAIL stream
 * Returns: T if stream still alive, NIL if not
 */

long bezerk_ping (MAILSTREAM *stream)
{
				/* punt if stream no longer alive */
  if (!(stream && LOCAL)) return NIL;
				/* parse mailbox, punt if parse dies */
  return (bezerk_parse (stream)) ? T : NIL;
}


/* Berkeley mail check mailbox (reparses status too)
 * Accepts: MAIL stream
 */

void bezerk_check (MAILSTREAM *stream)
{
  unsigned long i = 1;
  if (bezerk_ping (stream)) {	/* ping mailbox */
				/* get new message status */
    while (i <= stream->nmsgs) mail_elt (stream,i++);
    mm_log ("Check completed",(long) NIL);
  }
}

/* Berkeley mail expunge mailbox
 * Accepts: MAIL stream
 *	    sequence to expunge if non-NIL
 *	    expunge options
 * Returns: T, always
 */

long bezerk_expunge (MAILSTREAM *stream,char *sequence,long options)
{
  if (!stream->silent) mm_log ("Expunge ignored on readonly mailbox",WARN);
  return LONGT;
}

/* Berkeley mail copy message(s)
 * Accepts: MAIL stream
 *	    sequence
 *	    destination mailbox
 *	    copy options
 * Returns: T if success, NIL if failed
 */

long bezerk_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
  char tmp[MAILTMPLEN];
  struct stat sbuf;
  MESSAGECACHE *elt;
  unsigned long i,j,k;
  int fd;
  mailproxycopy_t pc =
    (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
  if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
	mail_sequence (stream,sequence))) return NIL;
				/* make sure valid mailbox */
  if (!bezerk_isvalid (mailbox,tmp) && errno) {
    if (errno == ENOENT)
      mm_notify (stream,"[TRYCREATE] Must create mailbox before append",
		 (long) NIL);
    else if (pc) return (*pc) (stream,sequence,mailbox,options);
    else if (mailboxfile (tmp,mailbox)) {
      sprintf (tmp,"Not a Bezerk-format mailbox: %s",mailbox);
      mm_log (tmp,ERROR);
    }
    else bezerk_badname (tmp,mailbox);
    return NIL;
  }
				/* open the destination */
  if (!mailboxfile (tmp,mailbox) ||
      (fd = open (tmp,O_BINARY|O_WRONLY|O_APPEND|O_CREAT,
		  S_IREAD|S_IWRITE)) < 0) {
    sprintf (tmp,"Unable to open copy mailbox: %s",strerror (errno));
    mm_log (tmp,ERROR);
    return NIL;
  }

  mm_critical (stream);		/* go critical */
  fstat (fd,&sbuf);		/* get current file size */
				/* for each requested message */
  for (i = 1; i <= stream->nmsgs; i++)
    if ((elt = mail_elt (stream,i))->sequence) {
      lseek (LOCAL->fd,elt->private.special.offset,SEEK_SET);
				/* number of bytes to copy */
      j = elt->private.msg.full.offset + elt->rfc822_size;
      do {			/* read from source position */
	k = min (j,(unsigned long) MAILTMPLEN);
	read (LOCAL->fd,tmp,(unsigned int) k);
	if (write (fd,tmp,(unsigned int) k) < 0) {
	  sprintf (tmp,"Unable to write message: %s",strerror (errno));
	  mm_log (tmp,ERROR);
	  chsize (fd,sbuf.st_size);
	  close (fd);		/* punt */
	  mm_nocritical (stream);
	  return NIL;
	}
      } while (j -= k);		/* until done */
    }
  close (fd);			/* close the file */
  mm_nocritical (stream);	/* release critical */
				/* delete all requested messages */
  if (options & CP_MOVE) for (i = 1; i <= stream->nmsgs; i++)
    if ((elt = mail_elt (stream,i))->sequence) elt->deleted = T;
  if (mail_parameters (NIL,GET_COPYUID,NIL))
    mm_log ("Can not return meaningful COPYUID with this mailbox format",WARN);
  return T;
}

/* Berkeley mail append message from stringstruct
 * Accepts: MAIL stream
 *	    destination mailbox
 *	    append callback
 *	    data for callback
 * Returns: T if append successful, else NIL
 */

#define BUFLEN MAILTMPLEN

long bezerk_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
{
  struct stat sbuf;
  int fd;
  unsigned long i,j;
  char *flags,*date,buf[BUFLEN],tmp[MAILTMPLEN],file[MAILTMPLEN];
  FILE *sf,*df;
  MESSAGECACHE elt;
  STRING *message;
  long ret = LONGT;
				/* default stream to prototype */
  if (!stream) stream = &bezerkproto;
				/* make sure valid mailbox */
  if (!bezerk_isvalid (mailbox,tmp) && errno) {
    if (errno == ENOENT) {
      if (((mailbox[0] == 'I') || (mailbox[0] == 'i')) &&
	  ((mailbox[1] == 'N') || (mailbox[1] == 'n')) &&
	  ((mailbox[2] == 'B') || (mailbox[2] == 'b')) &&
	  ((mailbox[3] == 'O') || (mailbox[3] == 'o')) &&
	  ((mailbox[4] == 'X') || (mailbox[4] == 'x')) && !mailbox[5])
	bezerk_create (NIL,"INBOX");
      else {
	mm_notify (stream,"[TRYCREATE] Must create mailbox before append",NIL);
	return NIL;
      }
    }
    else if (mailboxfile (tmp,mailbox)) {
      sprintf (tmp,"Not a Bezerk-format mailbox: %.80ss",mailbox);
      mm_log (tmp,ERROR);
    }
    else bezerk_badname (tmp,mailbox);
    return NIL;
  }
  tzset ();			/* initialize timezone stuff */
				/* get first message */
  if (!(*af) (stream,data,&flags,&date,&message)) return NIL;
  if (!(sf = tmpfile ())) {	/* must have scratch file */
    sprintf (tmp,"Unable to create scratch file: %.80s",strerror (errno));
    mm_log (tmp,ERROR);
  }

  do {				/* parse date */
    if (!date) rfc822_date (date = tmp);
    if (!mail_parse_date (&elt,date)) {
      sprintf (tmp,"Bad date in append: %.80s",date);
      mm_log (tmp,ERROR);
    }
    else {			/* user wants to suppress time zones? */
      if (mail_parameters (NIL,GET_NOTIMEZONES,NIL)) {
	time_t when = mail_longdate (&elt);
	date = ctime (&when);	/* use traditional date */
      }
				/* use POSIX-style date */
      else date = mail_cdate (tmp,&elt);
      if (!SIZE (message)) mm_log ("Append of zero-length message",ERROR);
      else if (!bezerk_append_msg (stream,sf,flags,date,message)) {
	sprintf (tmp,"Error writing scratch file: %.80s",strerror (errno));
	mm_log (tmp,ERROR);
      }
				/* get next message */
      else if ((*af) (stream,data,&flags,&date,&message)) continue;
    }
    fclose (sf);		/* punt scratch file */
    return NIL;			/* give up */
  } while (message);		/* until no more messages */
  if (fflush (sf) || fstat (fileno (sf),&sbuf)) {
    sprintf (tmp,"Error finishing scratch file: %.80s",strerror (errno));
    mm_log (tmp,ERROR);
    fclose (sf);		/* punt scratch file */
    return NIL;			/* give up */
  }
  i = sbuf.st_size;		/* size of scratch file */

  mm_critical (stream);		/* go critical */
				/* open the destination */
  if (!mailboxfile (tmp,mailbox) || 
      ((fd = open (tmp,O_BINARY|O_WRONLY|O_APPEND|O_CREAT,
		   S_IREAD|S_IWRITE)) < 0) ||
      !(df = fdopen (fd,"ab"))) {
    mm_nocritical (stream);	/* done with critical */
    sprintf (tmp,"Can't open append mailbox: %s",strerror (errno));
    mm_log (tmp,ERROR);
    return NIL;
  }
  fstat (fd,&sbuf);		/* get current file size */
  while (i)			/* until written all bytes */
    if ((j = fread (buf,1,min ((long) BUFLEN,i),sf)) &&
	(fwrite (buf,1,j,df) == j)) i -= j;
  fclose (sf);			/* done with scratch file */
				/* make sure append wins */
  if (i || (fflush (df) == EOF)) {
    chsize (fd,sbuf.st_size);	/* revert file */
    close (fd);			/* make sure fclose() doesn't corrupt us */
    sprintf (buf,"Message append failed: %s",strerror (errno));
    mm_log (buf,ERROR);
    ret = NIL;			/* return error */
  }
  fclose (df);
  mm_nocritical (stream);	/* release critical */
  if (ret && mail_parameters (NIL,GET_APPENDUID,NIL))
    mm_log ("Can not return meaningful APPENDUID with this mailbox format",
	    WARN);
  return ret;
}

/* Write single message to append scratch file
 * Accepts: MAIL stream
 *	    scratch file
 *	    flags
 *	    message stringstruct
 * Returns: NIL if write error, else T
 */

int bezerk_append_msg (MAILSTREAM *stream,FILE *sf,char *flags,char *date,
		     STRING *msg)
{
  int c;
  unsigned long i,uf;
  char tmp[MAILTMPLEN];
  long f = mail_parse_flags (stream,flags,&uf);
				/* build initial header */
  if ((fprintf (sf,"From %s@%s %sStatus: ",
		myusername (),mylocalhost (),date) < 0) ||
      (f&fSEEN && (putc ('R',sf) == EOF)) ||
      (fputs ("\nX-Status: ",sf) == EOF) ||
      (f&fDELETED && (putc ('D',sf) == EOF)) ||
      (f&fFLAGGED && (putc ('F',sf) == EOF)) ||
      (f&fANSWERED && (putc ('A',sf) == EOF)) ||
      (f&fDRAFT && (putc ('T',sf) == EOF)) ||
      (fputs ("\nX-Keywords:",sf) == EOF)) return NIL;
  while (uf)			/* write user flags */
    if (fprintf (sf," %s",stream->user_flags[find_rightmost_bit (&uf)]) < 0)
      return NIL;
				/* tie off flags */
  if (putc ('\n',sf) == EOF) return NIL;
  while (SIZE (msg)) {		/* copy text to scratch file */
				/* possible delimiter if line starts with F */
    if ((c = 0xff & SNX (msg)) == 'F') {
				/* copy line to buffer */
      for (i = 1,tmp[0] = c; SIZE (msg) && (c != '\n') && (i < MAILTMPLEN);)
	if (((c = 0xff & SNX (msg)) != '\r') || !(SIZE (msg)) ||
	    (CHR (msg) != '\n')) tmp[i++] = c;
      if ((i > 4) && (tmp[1] == 'r') && (tmp[2] == 'o') && (tmp[3] == 'm') &&
	  (tmp[4] == ' ')) {	/* possible "From " line? */
				/* yes, see if need to write a widget */
	if (((c != '\n') || bezerk_valid_line (tmp,NIL,NIL)) &&
	    (putc ('>',sf) == EOF)) return NIL;
      }
				/* write buffered text */
      if (fwrite (tmp,1,i,sf) != i) return NIL;
      if (c == '\n') continue;	/* all done if got a complete line */
    }
				/* copy line, toss out CR from CRLF */
    do if (((c == '\r') && SIZE (msg) && ((c = 0xff & SNX (msg)) != '\n') &&
	    (putc ('\r',sf) == EOF)) || (putc (c,sf) == EOF)) return NIL;
    while ((c != '\n') && SIZE (msg) && ((c = 0xff & SNX (msg)) ? c : T));
  }
				/* write trailing newline and return */
  return (putc ('\n',sf) == EOF) ? NIL : T;
}


/* Return bad file name error message
 * Accepts: temporary buffer
 *	    file name
 * Returns: long NIL always
 */

long bezerk_badname (char *tmp,char *s)
{
  sprintf (tmp,"Invalid mailbox name: %s",s);
  mm_log (tmp,ERROR);
  return (long) NIL;
}

/* Parse mailbox
 * Accepts: MAIL stream
 * Returns: T if parse OK
 *	    NIL if failure, stream aborted
 */

long bezerk_parse (MAILSTREAM *stream)
{
  struct stat sbuf;
  MESSAGECACHE *elt;
  char *s,*t,tmp[MAILTMPLEN + 1],*db,datemsg[100];
  long i;
  int j,ti,zn;
  long curpos = LOCAL->filesize;
  long nmsgs = stream->nmsgs;
  long recent = stream->recent;
  short silent = stream->silent;
  fstat (LOCAL->fd,&sbuf);	/* get status */
  if (sbuf.st_size < curpos) {	/* sanity check */
    sprintf (tmp,"Mailbox shrank from %ld to %ld!",curpos,sbuf.st_size);
    mm_log (tmp,ERROR);
    bezerk_close (stream,NIL);
    return NIL;
  }
  stream->silent = T;		/* don't pass up mm_exists() events yet */
  db = datemsg + strlen (strcpy (datemsg,"Unparsable date: "));
				/* while there is data to read */
  while (i = sbuf.st_size - curpos){
				/* get to that position in the file */
    lseek (LOCAL->fd,curpos,SEEK_SET);
				/* read first buffer's worth */
    read (LOCAL->fd,tmp,j = (int) min (i,(long) MAILTMPLEN));
    tmp[j] = '\0';		/* tie off buffer */
    if (!(ti = bezerk_valid_line (tmp,&t,&zn))) {
      mm_log ("Mailbox format invalidated (consult an expert), aborted",ERROR);
      bezerk_close (stream,NIL);
      return NIL;
    }

				/* swell the cache */
    mail_exists (stream,++nmsgs);
				/* instantiate an elt for this message */
    (elt = mail_elt (stream,nmsgs))->valid = T;
    elt->private.uid = ++stream->uid_last;
				/* note file offset of header */
    elt->private.special.offset = curpos;
				/* note offset of message */
    elt->private.msg.full.offset =
      (s = ((*t == '\015') ? (t + 2) : (t + 1))) - tmp;
				/* generate plausible IMAPish date string */
    db[2] = db[6] = db[20] = '-'; db[11] = ' '; db[14] = db[17] = ':';
				/* dd */
    db[0] = t[ti - 2]; db[1] = t[ti - 1];
				/* mmm */
    db[3] = t[ti - 6]; db[4] = t[ti - 5]; db[5] = t[ti - 4];
				/* hh */
    db[12] = t[ti + 1]; db[13] = t[ti + 2];
				/* mm */
    db[15] = t[ti + 4]; db[16] = t[ti + 5];
    if (t[ti += 6] == ':') {	/* ss if present */
      db[18] = t[++ti]; db[19] = t[++ti];
      ti++;			/* move to space */
    }
    else db[18] = db[19] = '0';	/* assume 0 seconds */
				/* yy -- advance over timezone if necessary */
    if (++zn == ++ti) ti += (((t[zn] == '+') || (t[zn] == '-')) ? 6 : 4);
    db[7] = t[ti]; db[8] = t[ti + 1]; db[9] = t[ti + 2]; db[10] = t[ti + 3];
    t = zn ? (t + zn) : "LCL";	/* zzz */
    db[21] = *t++; db[22] = *t++; db[23] = *t++;
    if ((db[21] != '+') && (db[21] != '-')) db[24] = '\0';
    else {			/* numeric time zone */
      db[20] = ' '; db[24] = *t++; db[25] = *t++; db[26] = '\0';
    }
				/* set internal date */
    if (!mail_parse_date (elt,db)) mm_log (datemsg,WARN);

    curpos += s - tmp;		/* advance position after header */
    t = strchr (s,'\012');	/* start of next line */
				/* find start of next message */
    while (!(bezerk_valid_line (s,NIL,NIL))) {
      if (t) {			/* have next line? */
	t++;			/* advance to new line */
	curpos += t - s;	/* update position and size */
	elt->rfc822_size += ((t - s) + ((t[-2] == '\015') ? 0 : 1));
	s = t;			/* move to next line */
	t = strchr (s,'\012');
      }
      else {			/* try next buffer */
	j = strlen (s);		/* length of unread data in buffer */
	if ((i = sbuf.st_size - curpos) && (i != j)) {
				/* get to that position in the file */
	  lseek (LOCAL->fd,curpos,SEEK_SET);
				/* read another buffer's worth */
	  read (LOCAL->fd,s = tmp,j = (int) min (i,(long) MAILTMPLEN));
	  tmp[j] = '\0';	/* tie off buffer */
	  if (!(t = strchr (s,'\012'))) fatal ("Line too long in mailbox");
	}
	else {
	  curpos += j;		/* last bit of data */
	  elt->rfc822_size += j;
	  break;
	}
      }
    }
  }
				/* update parsed file size */
  LOCAL->filesize = sbuf.st_size;
  stream->silent = silent;	/* can pass up events now */
  mail_exists (stream,nmsgs);	/* notify upper level of new mailbox size */
  mail_recent (stream,recent);	/* and of change in recent messages */
  return T;			/* return the winnage */
}

/* Berkeley locate header for a message
 * Accepts: MAIL stream
 *	    message number
 *	    pointer to returned header size
 * Returns: position of header in file
 */

unsigned long bezerk_hdrpos (MAILSTREAM *stream,unsigned long msgno,
			     unsigned long *size)
{
  long siz;
  size_t i = 0;
  char c = '\0';
  char *s;
  char tmp[MAILTMPLEN];
  MESSAGECACHE *elt = mail_elt (stream,msgno);
  long pos = elt->private.special.offset + elt->private.msg.full.offset;
				/* is size known? */
  if (!(*size = elt->private.msg.header.text.size)) {
				/* get to header position */
    lseek (LOCAL->fd,pos,SEEK_SET);
				/* search message for CRLF CRLF */
    for (siz = 1; siz <= elt->rfc822_size; siz++) {
      if (!i &&			/* buffer empty? */
	  (read (LOCAL->fd,s = tmp,
		 i = (size_t) min(elt->rfc822_size-siz,(long)MAILTMPLEN))<= 0))
	return pos;
      else i--;
				/* two newline sequence? */
      if ((c == '\012') && (*s == '\012')) {
				/* yes, note for later */
	elt->private.msg.header.text.size = (*size = siz);
	return pos;		/* return to caller */
      }
      else if ((c == '\012') && (*s == '\015')) {
				/* yes, note for later */
	elt->private.msg.header.text.size = (*size = siz + 1);
	return pos;		/* return to caller */
      }
      else c = *s++;		/* next character */
    }
  }
  return pos;			/* have position */
}