imapext-2007
view src/osdep/os2/mtxnt.c @ 0:ada5e610ab86
imap-2007e
| author | yuuji@gentei.org |
|---|---|
| date | Mon, 14 Sep 2009 15:17:45 +0900 |
| parents | |
| children |
line source
1 /* ========================================================================
2 * Copyright 1988-2007 University of Washington
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 *
11 * ========================================================================
12 */
14 /*
15 * Program: MTX mail routines
16 *
17 * Author: Mark Crispin
18 * Networks and Distributed Computing
19 * Computing & Communications
20 * University of Washington
21 * Administration Building, AG-44
22 * Seattle, WA 98195
23 * Internet: MRC@CAC.Washington.EDU
24 *
25 * Date: 22 May 1990
26 * Last Edited: 15 June 2007
27 */
30 /* FILE TIME SEMANTICS
31 *
32 * The atime is the last read time of the file.
33 * The mtime is the last flags update time of the file.
34 * The ctime is the last write time of the file.
35 */
37 #include <stdio.h>
38 #include <ctype.h>
39 #include <errno.h>
40 extern int errno; /* just in case */
41 #include "mail.h"
42 #include "osdep.h"
43 #include <fcntl.h>
44 #include <time.h>
45 #include <sys/stat.h>
46 #include <sys/utime.h>
47 #include "misc.h"
48 #include "dummy.h"
49 #include "fdstring.h"
51 /* MTX I/O stream local data */
53 typedef struct mtx_local {
54 unsigned int shouldcheck: 1; /* if ping should do a check instead */
55 unsigned int mustcheck: 1; /* if ping must do a check instead */
56 int fd; /* file descriptor for I/O */
57 off_t filesize; /* file size parsed */
58 time_t filetime; /* last file time */
59 time_t lastsnarf; /* last snarf time */
60 unsigned char *buf; /* temporary buffer */
61 unsigned long buflen; /* current size of temporary buffer */
62 } MTXLOCAL;
65 /* Convenient access to local data */
67 #define LOCAL ((MTXLOCAL *) stream->local)
70 /* Function prototypes */
72 DRIVER *mtx_valid (char *name);
73 int mtx_isvalid (char *name,char *file);
74 void *mtx_parameters (long function,void *value);
75 void mtx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
76 void mtx_list (MAILSTREAM *stream,char *ref,char *pat);
77 void mtx_lsub (MAILSTREAM *stream,char *ref,char *pat);
78 long mtx_create (MAILSTREAM *stream,char *mailbox);
79 long mtx_delete (MAILSTREAM *stream,char *mailbox);
80 long mtx_rename (MAILSTREAM *stream,char *old,char *newname);
81 long mtx_status (MAILSTREAM *stream,char *mbx,long flags);
82 MAILSTREAM *mtx_open (MAILSTREAM *stream);
83 void mtx_close (MAILSTREAM *stream,long options);
84 void mtx_flags (MAILSTREAM *stream,char *sequence,long flags);
85 char *mtx_header (MAILSTREAM *stream,unsigned long msgno,
86 unsigned long *length,long flags);
87 long mtx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
88 void mtx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags);
89 void mtx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
90 long mtx_ping (MAILSTREAM *stream);
91 void mtx_check (MAILSTREAM *stream);
92 void mtx_snarf (MAILSTREAM *stream);
93 long mtx_expunge (MAILSTREAM *stream,char *sequence,long options);
94 long mtx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
95 long mtx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
97 long mtx_parse (MAILSTREAM *stream);
98 MESSAGECACHE *mtx_elt (MAILSTREAM *stream,unsigned long msgno);
99 void mtx_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt);
100 void mtx_update_status (MAILSTREAM *stream,unsigned long msgno,long syncflag);
101 unsigned long mtx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
102 unsigned long *size);
105 /* MTX mail routines */
108 /* Driver dispatch used by MAIL */
110 DRIVER mtxdriver = {
111 "mtx", /* driver name */
112 /* driver flags */
113 DR_LOCAL|DR_MAIL|DR_CRLF|DR_NOSTICKY,
114 (DRIVER *) NIL, /* next driver */
115 mtx_valid, /* mailbox is valid for us */
116 mtx_parameters, /* manipulate parameters */
117 mtx_scan, /* scan mailboxes */
118 mtx_list, /* list mailboxes */
119 mtx_lsub, /* list subscribed mailboxes */
120 NIL, /* subscribe to mailbox */
121 NIL, /* unsubscribe from mailbox */
122 mtx_create, /* create mailbox */
123 mtx_delete, /* delete mailbox */
124 mtx_rename, /* rename mailbox */
125 mail_status_default, /* status of mailbox */
126 mtx_open, /* open mailbox */
127 mtx_close, /* close mailbox */
128 mtx_flags, /* fetch message "fast" attributes */
129 mtx_flags, /* fetch message flags */
130 NIL, /* fetch overview */
131 NIL, /* fetch message envelopes */
132 mtx_header, /* fetch message header */
133 mtx_text, /* fetch message body */
134 NIL, /* fetch partial message text */
135 NIL, /* unique identifier */
136 NIL, /* message number */
137 mtx_flag, /* modify flags */
138 mtx_flagmsg, /* per-message modify flags */
139 NIL, /* search for message based on criteria */
140 NIL, /* sort messages */
141 NIL, /* thread messages */
142 mtx_ping, /* ping mailbox to see if still alive */
143 mtx_check, /* check for new messages */
144 mtx_expunge, /* expunge deleted messages */
145 mtx_copy, /* copy messages to another mailbox */
146 mtx_append, /* append string message to mailbox */
147 NIL /* garbage collect stream */
148 };
150 /* prototype stream */
151 MAILSTREAM mtxproto = {&mtxdriver};
153 /* MTX mail validate mailbox
154 * Accepts: mailbox name
155 * Returns: our driver if name is valid, NIL otherwise
156 */
158 DRIVER *mtx_valid (char *name)
159 {
160 char tmp[MAILTMPLEN];
161 return mtx_isvalid (name,tmp) ? &mtxdriver : NIL;
162 }
165 /* MTX mail test for valid mailbox
166 * Accepts: mailbox name
167 * buffer to return file name
168 * Returns: T if valid, NIL otherwise
169 */
171 int mtx_isvalid (char *name,char *file)
172 {
173 int fd;
174 int ret = NIL;
175 char *s,tmp[MAILTMPLEN];
176 struct stat sbuf;
177 struct utimbuf times;
178 errno = EINVAL; /* assume invalid argument */
179 /* if file, get its status */
180 if ((s = dummy_file (file,name)) && !stat (s,&sbuf) &&
181 ((sbuf.st_mode & S_IFMT) == S_IFREG)) {
182 if (!sbuf.st_size)errno = 0;/* empty file */
183 else if ((fd = open (file,O_BINARY|O_RDONLY,NIL)) >= 0) {
184 memset (tmp,'\0',MAILTMPLEN);
185 if ((read (fd,tmp,64) >= 0) && (s = strchr (tmp,'\015')) &&
186 (s[1] == '\012')) { /* valid format? */
187 *s = '\0'; /* tie off header */
188 /* must begin with dd-mmm-yy" */
189 ret = (((tmp[2] == '-' && tmp[6] == '-') ||
190 (tmp[1] == '-' && tmp[5] == '-')) &&
191 (s = strchr (tmp+18,',')) && strchr (s+2,';')) ? T : NIL;
192 }
193 else errno = -1; /* bogus format */
194 close (fd); /* close the file */
195 /* \Marked status? */
196 if (sbuf.st_ctime > sbuf.st_atime) {
197 /* preserve atime and mtime */
198 times.actime = sbuf.st_atime;
199 times.modtime = sbuf.st_mtime;
200 utime (file,×); /* set the times */
201 }
202 }
203 }
204 /* in case INBOX but not mtx format */
205 else if ((errno == ENOENT) && !compare_cstring (name,"INBOX")) errno = -1;
206 return ret; /* return what we should */
207 }
210 /* MTX manipulate driver parameters
211 * Accepts: function code
212 * function-dependent value
213 * Returns: function-dependent return value
214 */
216 void *mtx_parameters (long function,void *value)
217 {
218 return NIL;
219 }
221 /* MTX mail scan mailboxes
222 * Accepts: mail stream
223 * reference
224 * pattern to search
225 * string to scan
226 */
228 void mtx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
229 {
230 if (stream) dummy_scan (NIL,ref,pat,contents);
231 }
234 /* MTX mail list mailboxes
235 * Accepts: mail stream
236 * reference
237 * pattern to search
238 */
240 void mtx_list (MAILSTREAM *stream,char *ref,char *pat)
241 {
242 if (stream) dummy_list (NIL,ref,pat);
243 }
246 /* MTX mail list subscribed mailboxes
247 * Accepts: mail stream
248 * reference
249 * pattern to search
250 */
252 void mtx_lsub (MAILSTREAM *stream,char *ref,char *pat)
253 {
254 if (stream) dummy_lsub (NIL,ref,pat);
255 }
257 /* MTX mail create mailbox
258 * Accepts: MAIL stream
259 * mailbox name to create
260 * Returns: T on success, NIL on failure
261 */
263 long mtx_create (MAILSTREAM *stream,char *mailbox)
264 {
265 char *s,mbx[MAILTMPLEN];
266 if (s = dummy_file (mbx,mailbox)) return dummy_create (stream,s);
267 sprintf (mbx,"Can't create %.80s: invalid name",mailbox);
268 mm_log (mbx,ERROR);
269 return NIL;
270 }
273 /* MTX mail delete mailbox
274 * Accepts: MAIL stream
275 * mailbox name to delete
276 * Returns: T on success, NIL on failure
277 */
279 long mtx_delete (MAILSTREAM *stream,char *mailbox)
280 {
281 return mtx_rename (stream,mailbox,NIL);
282 }
284 /* MTX mail rename mailbox
285 * Accepts: MAIL stream
286 * old mailbox name
287 * new mailbox name (or NIL for delete)
288 * Returns: T on success, NIL on failure
289 */
291 long mtx_rename (MAILSTREAM *stream,char *old,char *newname)
292 {
293 long ret = LONGT;
294 char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
295 int fd,ld;
296 struct stat sbuf;
297 if (!dummy_file (file,old) ||
298 (newname && (!((s = mailboxfile (tmp,newname)) && *s) ||
299 ((s = strrchr (tmp,'\\')) && !s[1])))) {
300 sprintf (tmp,newname ?
301 "Can't rename mailbox %.80s to %.80s: invalid name" :
302 "Can't delete mailbox %.80s: invalid name",
303 old,newname);
304 mm_log (tmp,ERROR);
305 return NIL;
306 }
307 if ((fd = open (file,O_BINARY|O_RDWR,NIL)) < 0) {
308 sprintf (tmp,"Can't open mailbox %.80s: %s",old,strerror (errno));
309 mm_log (tmp,ERROR);
310 return NIL;
311 }
312 /* get exclusive parse/append permission */
313 if ((ld = lockname (lock,file,LOCK_EX)) < 0) {
314 mm_log ("Unable to lock rename mailbox",ERROR);
315 return NIL;
316 }
317 /* lock out other users */
318 if (flock (fd,LOCK_EX|LOCK_NB)) {
319 close (fd); /* couldn't lock, give up on it then */
320 sprintf (tmp,"Mailbox %.80s is in use by another process",old);
321 mm_log (tmp,ERROR);
322 unlockfd (ld,lock); /* release exclusive parse/append permission */
323 return NIL;
324 }
326 if (newname) { /* want rename? */
327 /* found superior to destination name? */
328 if ((s = strrchr (tmp,'\\')) && (s != tmp) &&
329 ((tmp[1] != ':') || (s != tmp + 2))) {
330 c = s[1]; /* remember character after delimiter */
331 *s = s[1] = '\0'; /* tie off name at delimiter */
332 /* name doesn't exist, create it */
333 if (stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) {
334 *s = '\\'; /* restore delimiter */
335 if (!dummy_create (stream,tmp)) ret = NIL;
336 }
337 else *s = '\\'; /* restore delimiter */
338 s[1] = c; /* restore character after delimiter */
339 }
340 flock (fd,LOCK_UN); /* release lock on the file */
341 close (fd); /* pacify NTFS */
342 /* rename the file */
343 if (ret && rename (file,tmp)) {
344 sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",old,newname,
345 strerror (errno));
346 mm_log (tmp,ERROR);
347 ret = NIL; /* set failure */
348 }
349 }
350 else {
351 flock (fd,LOCK_UN); /* release lock on the file */
352 close (fd); /* pacify NTFS */
353 if (unlink (file)) {
354 sprintf (tmp,"Can't delete mailbox %.80s: %.80s",old,strerror (errno));
355 mm_log (tmp,ERROR);
356 ret = NIL; /* set failure */
357 }
358 }
359 unlockfd (ld,lock); /* release exclusive parse/append permission */
360 return ret; /* return success */
361 }
363 /* MTX mail open
364 * Accepts: stream to open
365 * Returns: stream on success, NIL on failure
366 */
368 MAILSTREAM *mtx_open (MAILSTREAM *stream)
369 {
370 int fd,ld;
371 char tmp[MAILTMPLEN];
372 /* return prototype for OP_PROTOTYPE call */
373 if (!stream) return &mtxproto;
374 if (stream->local) fatal ("mtx recycle stream");
375 /* canonicalize the mailbox name */
376 if (!dummy_file (tmp,stream->mailbox)) {
377 sprintf (tmp,"Can't open - invalid name: %.80s",stream->mailbox);
378 mm_log (tmp,ERROR);
379 }
380 if (stream->rdonly ||
381 (fd = open (tmp,O_BINARY|O_RDWR,NIL)) < 0) {
382 if ((fd = open (tmp,O_BINARY|O_RDONLY,NIL)) < 0) {
383 sprintf (tmp,"Can't open mailbox: %.80s",strerror (errno));
384 mm_log (tmp,ERROR);
385 return NIL;
386 }
387 else if (!stream->rdonly) { /* got it, but readonly */
388 mm_log ("Can't get write access to mailbox, access is readonly",WARN);
389 stream->rdonly = T;
390 }
391 }
392 stream->local = fs_get (sizeof (MTXLOCAL));
393 LOCAL->fd = fd; /* bind the file */
394 LOCAL->buf = (char *) fs_get (CHUNKSIZE);
395 LOCAL->buflen = CHUNKSIZE - 1;
396 /* note if an INBOX or not */
397 stream->inbox = !compare_cstring (stream->mailbox,"INBOX");
398 fs_give ((void **) &stream->mailbox);
399 stream->mailbox = cpystr (tmp);
400 /* get shared parse permission */
401 if ((ld = lockname (tmp,stream->mailbox,LOCK_SH)) < 0) {
402 mm_log ("Unable to lock open mailbox",ERROR);
403 return NIL;
404 }
405 flock (LOCAL->fd,LOCK_SH); /* lock the file */
406 unlockfd (ld,tmp); /* release shared parse permission */
407 LOCAL->filesize = 0; /* initialize parsed file size */
408 LOCAL->filetime = 0; /* time not set up yet */
409 LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
410 stream->sequence++; /* bump sequence number */
411 stream->uid_validity = (unsigned long) time (0);
412 /* parse mailbox */
413 stream->nmsgs = stream->recent = 0;
414 if (mtx_ping (stream) && !stream->nmsgs)
415 mm_log ("Mailbox is empty",(long) NIL);
416 if (!LOCAL) return NIL; /* failure if stream died */
417 stream->perm_seen = stream->perm_deleted =
418 stream->perm_flagged = stream->perm_answered = stream->perm_draft =
419 stream->rdonly ? NIL : T;
420 stream->perm_user_flags = stream->rdonly ? NIL : 0xffffffff;
421 return stream; /* return stream to caller */
422 }
424 /* MTX mail close
425 * Accepts: MAIL stream
426 * close options
427 */
429 void mtx_close (MAILSTREAM *stream,long options)
430 {
431 if (stream && LOCAL) { /* only if a file is open */
432 int silent = stream->silent;
433 stream->silent = T; /* note this stream is dying */
434 if (options & CL_EXPUNGE) mtx_expunge (stream,NIL,NIL);
435 stream->silent = silent; /* restore previous status */
436 flock (LOCAL->fd,LOCK_UN); /* unlock local file */
437 close (LOCAL->fd); /* close the local file */
438 /* free local text buffer */
439 if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
440 /* nuke the local data */
441 fs_give ((void **) &stream->local);
442 stream->dtb = NIL; /* log out the DTB */
443 }
444 }
447 /* MTX mail fetch flags
448 * Accepts: MAIL stream
449 * sequence
450 * option flags
451 * Sniffs at file to see if some other process changed the flags
452 */
454 void mtx_flags (MAILSTREAM *stream,char *sequence,long flags)
455 {
456 unsigned long i;
457 if (mtx_ping (stream) && /* ping mailbox, get new status for messages */
458 ((flags & FT_UID) ? mail_uid_sequence (stream,sequence) :
459 mail_sequence (stream,sequence)))
460 for (i = 1; i <= stream->nmsgs; i++)
461 if (mail_elt (stream,i)->sequence) mtx_elt (stream,i);
462 }
464 /* MTX mail fetch message header
465 * Accepts: MAIL stream
466 * message # to fetch
467 * pointer to returned header text length
468 * option flags
469 * Returns: message header in RFC822 format
470 */
472 char *mtx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
473 long flags)
474 {
475 *length = 0; /* default to empty */
476 if (flags & FT_UID) return "";/* UID call "impossible" */
477 /* get to header position */
478 lseek (LOCAL->fd,mtx_hdrpos (stream,msgno,length),L_SET);
479 /* is buffer big enough? */
480 if (*length > LOCAL->buflen) {
481 fs_give ((void **) &LOCAL->buf);
482 LOCAL->buf = (char *) fs_get ((LOCAL->buflen = *length) + 1);
483 }
484 LOCAL->buf[*length] = '\0'; /* tie off string */
485 /* slurp the data */
486 read (LOCAL->fd,LOCAL->buf,*length);
487 return LOCAL->buf;
488 }
490 /* MTX mail fetch message text (body only)
491 * Accepts: MAIL stream
492 * message # to fetch
493 * pointer to returned header text length
494 * option flags
495 * Returns: T, always
496 */
498 long mtx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
499 {
500 FDDATA d;
501 unsigned long i,j;
502 MESSAGECACHE *elt;
503 /* UID call "impossible" */
504 if (flags & FT_UID) return NIL;
505 elt = mtx_elt (stream,msgno); /* get message status */
506 /* if message not seen */
507 if (!(flags & FT_PEEK) && !elt->seen) {
508 elt->seen = T; /* mark message as seen */
509 /* recalculate status */
510 mtx_update_status (stream,msgno,NIL);
511 mm_flags (stream,msgno);
512 }
513 /* find header position */
514 i = mtx_hdrpos (stream,msgno,&j);
515 d.fd = LOCAL->fd; /* set up file descriptor */
516 d.pos = i + j;
517 d.chunk = LOCAL->buf; /* initial buffer chunk */
518 d.chunksize = CHUNKSIZE;
519 INIT (bs,fd_string,&d,elt->rfc822_size - j);
520 return T; /* success */
521 }
523 /* MTX mail modify flags
524 * Accepts: MAIL stream
525 * sequence
526 * flag(s)
527 * option flags
528 */
530 void mtx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags)
531 {
532 struct utimbuf times;
533 struct stat sbuf;
534 if (!stream->rdonly) { /* make sure the update takes */
535 fsync (LOCAL->fd);
536 fstat (LOCAL->fd,&sbuf); /* get current write time */
537 times.modtime = LOCAL->filetime = sbuf.st_mtime;
538 times.actime = time (0); /* make sure read comes after all that */
539 utime (stream->mailbox,×);
540 }
541 }
544 /* MTX mail per-message modify flags
545 * Accepts: MAIL stream
546 * message cache element
547 */
549 void mtx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
550 {
551 struct stat sbuf;
552 /* maybe need to do a checkpoint? */
553 if (LOCAL->filetime && !LOCAL->shouldcheck) {
554 fstat (LOCAL->fd,&sbuf); /* get current write time */
555 if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
556 LOCAL->filetime = 0; /* don't do this test for any other messages */
557 }
558 /* recalculate status */
559 mtx_update_status (stream,elt->msgno,NIL);
560 }
562 /* MTX mail ping mailbox
563 * Accepts: MAIL stream
564 * Returns: T if stream still alive, NIL if not
565 */
567 long mtx_ping (MAILSTREAM *stream)
568 {
569 unsigned long i = 1;
570 long r = T;
571 int ld;
572 char lock[MAILTMPLEN];
573 struct stat sbuf;
574 if (stream && LOCAL) { /* only if stream already open */
575 fstat (LOCAL->fd,&sbuf); /* get current file poop */
576 if (LOCAL->filetime && !(LOCAL->mustcheck || LOCAL->shouldcheck) &&
577 (LOCAL->filetime < sbuf.st_mtime)) LOCAL->shouldcheck = T;
578 /* check for changed message status */
579 if (LOCAL->mustcheck || LOCAL->shouldcheck) {
580 LOCAL->filetime = sbuf.st_mtime;
581 if (LOCAL->shouldcheck) /* babble when we do this unilaterally */
582 mm_notify (stream,"[CHECK] Checking for flag updates",NIL);
583 while (i <= stream->nmsgs) mtx_elt (stream,i++);
584 LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
585 }
586 /* get shared parse/append permission */
587 if ((sbuf.st_size != LOCAL->filesize) &&
588 ((ld = lockname (lock,stream->mailbox,LOCK_SH)) >= 0)) {
589 /* parse resulting mailbox */
590 r = (mtx_parse (stream)) ? T : NIL;
591 unlockfd (ld,lock); /* release shared parse/append permission */
592 }
593 }
594 return r; /* return result of the parse */
595 }
598 /* MTX mail check mailbox (reparses status too)
599 * Accepts: MAIL stream
600 */
602 void mtx_check (MAILSTREAM *stream)
603 {
604 /* mark that a check is desired */
605 if (LOCAL) LOCAL->mustcheck = T;
606 if (mtx_ping (stream)) mm_log ("Check completed",(long) NIL);
607 }
609 /* MTX mail expunge mailbox
610 * sequence to expunge if non-NIL
611 * expunge options
612 * Returns: T, always
613 */
615 long mtx_expunge (MAILSTREAM *stream,char *sequence,long options)
616 {
617 long ret;
618 struct utimbuf times;
619 struct stat sbuf;
620 off_t pos = 0;
621 int ld;
622 unsigned long i = 1;
623 unsigned long j,k,m,recent;
624 unsigned long n = 0;
625 unsigned long delta = 0;
626 char lock[MAILTMPLEN];
627 MESSAGECACHE *elt;
628 if (!(ret = (sequence ? ((options & EX_UID) ?
629 mail_uid_sequence (stream,sequence) :
630 mail_sequence (stream,sequence)) : LONGT) &&
631 mtx_ping (stream))); /* parse sequence if given, ping stream */
632 else if (stream->rdonly) mm_log ("Expunge ignored on readonly mailbox",WARN);
633 else {
634 if (LOCAL->filetime && !LOCAL->shouldcheck) {
635 fstat (LOCAL->fd,&sbuf); /* get current write time */
636 if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
637 }
638 /* get exclusive parse/append permission */
639 if ((ld = lockname (lock,stream->mailbox,LOCK_EX)) < 0)
640 mm_log ("Unable to lock expunge mailbox",ERROR);
641 /* make sure see any newly-arrived messages */
642 else if (!mtx_parse (stream));
643 /* get exclusive access */
644 else if (flock (LOCAL->fd,LOCK_EX|LOCK_NB)) {
645 flock (LOCAL->fd,LOCK_SH);/* recover previous lock */
646 mm_log ("Can't expunge because mailbox is in use by another process",
647 ERROR);
648 unlockfd (ld,lock); /* release exclusive parse/append permission */
649 }
651 else {
652 mm_critical (stream); /* go critical */
653 recent = stream->recent; /* get recent now that pinged and locked */
654 /* for each message */
655 while (i <= stream->nmsgs) {
656 /* get cache element */
657 elt = mtx_elt (stream,i);
658 /* number of bytes to smash or preserve */
659 k = elt->private.special.text.size + elt->rfc822_size;
660 /* if need to expunge this message */
661 if (elt->deleted && (sequence ? elt->sequence : T)) {
662 /* if recent, note one less recent message */
663 if (elt->recent) --recent;
664 delta += k; /* number of bytes to delete */
665 /* notify upper levels */
666 mail_expunged (stream,i);
667 n++; /* count up one more expunged message */
668 }
669 else if (i++ && delta) {/* preserved message */
670 /* first byte to preserve */
671 j = elt->private.special.offset;
672 do { /* read from source position */
673 m = min (k,LOCAL->buflen);
674 lseek (LOCAL->fd,j,L_SET);
675 read (LOCAL->fd,LOCAL->buf,m);
676 pos = j - delta; /* write to destination position */
677 while (T) {
678 lseek (LOCAL->fd,pos,L_SET);
679 if (write (LOCAL->fd,LOCAL->buf,m) > 0) break;
680 mm_notify (stream,strerror (errno),WARN);
681 mm_diskerror (stream,errno,T);
682 }
683 pos += m; /* new position */
684 j += m; /* next chunk, perhaps */
685 } while (k -= m); /* until done */
686 /* note the new address of this text */
687 elt->private.special.offset -= delta;
688 }
689 /* preserved but no deleted messages */
690 else pos = elt->private.special.offset + k;
691 }
692 if (n) { /* truncate file after last message */
693 if (pos != (LOCAL->filesize -= delta)) {
694 sprintf (LOCAL->buf,
695 "Calculated size mismatch %lu != %lu, delta = %lu",
696 (unsigned long) pos,(unsigned long) LOCAL->filesize,delta);
697 mm_log (LOCAL->buf,WARN);
698 LOCAL->filesize = pos;/* fix it then */
699 }
700 ftruncate (LOCAL->fd,LOCAL->filesize);
701 sprintf (LOCAL->buf,"Expunged %lu messages",n);
702 /* output the news */
703 mm_log (LOCAL->buf,(long) NIL);
704 }
705 else mm_log ("No messages deleted, so no update needed",(long) NIL);
706 fsync (LOCAL->fd); /* force disk update */
707 fstat (LOCAL->fd,&sbuf); /* get new write time */
708 times.modtime = LOCAL->filetime = sbuf.st_mtime;
709 times.actime = time (0); /* reset atime to now */
710 utime (stream->mailbox,×);
711 mm_nocritical (stream); /* release critical */
712 /* notify upper level of new mailbox size */
713 mail_exists (stream,stream->nmsgs);
714 mail_recent (stream,recent);
715 flock (LOCAL->fd,LOCK_SH);/* allow sharers again */
716 unlockfd (ld,lock); /* release exclusive parse/append permission */
717 }
718 }
719 return ret;
720 }
722 /* MTX mail copy message(s)
723 * Accepts: MAIL stream
724 * sequence
725 * destination mailbox
726 * copy options
727 * Returns: T if success, NIL if failed
728 */
730 long mtx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
731 {
732 struct stat sbuf;
733 struct utimbuf times;
734 MESSAGECACHE *elt;
735 unsigned long i,j,k;
736 long ret = LONGT;
737 int fd,ld;
738 char file[MAILTMPLEN],lock[MAILTMPLEN];
739 mailproxycopy_t pc =
740 (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
741 /* make sure valid mailbox */
742 if (!mtx_isvalid (mailbox,file)) switch (errno) {
743 case ENOENT: /* no such file? */
744 mm_notify (stream,"[TRYCREATE] Must create mailbox before copy",NIL);
745 return NIL;
746 case 0: /* merely empty file? */
747 break;
748 case EACCES: /* file protected */
749 sprintf (LOCAL->buf,"Can't access destination: %.80s",mailbox);
750 MM_LOG (LOCAL->buf,ERROR);
751 return NIL;
752 case EINVAL:
753 if (pc) return (*pc) (stream,sequence,mailbox,options);
754 sprintf (LOCAL->buf,"Invalid MTX-format mailbox name: %.80s",mailbox);
755 mm_log (LOCAL->buf,ERROR);
756 return NIL;
757 default:
758 if (pc) return (*pc) (stream,sequence,mailbox,options);
759 sprintf (LOCAL->buf,"Not a MTX-format mailbox: %.80s",mailbox);
760 mm_log (LOCAL->buf,ERROR);
761 return NIL;
762 }
763 if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
764 mail_sequence (stream,sequence))) return NIL;
765 /* got file? */
766 if ((fd = open (file,O_BINARY|O_RDWR|O_CREAT,S_IREAD|S_IWRITE)) < 0) {
767 sprintf (LOCAL->buf,"Unable to open copy mailbox: %.80s",strerror (errno));
768 mm_log (LOCAL->buf,ERROR);
769 return NIL;
770 }
771 mm_critical (stream); /* go critical */
772 /* get exclusive parse/append permission */
773 if (flock (fd,LOCK_SH) || ((ld = lockname (lock,file,LOCK_EX)) < 0)) {
774 mm_log ("Unable to lock copy mailbox",ERROR);
775 mm_nocritical (stream);
776 return NIL;
777 }
778 fstat (fd,&sbuf); /* get current file size */
779 lseek (fd,sbuf.st_size,L_SET);/* move to end of file */
781 /* for each requested message */
782 for (i = 1; ret && (i <= stream->nmsgs); i++)
783 if ((elt = mail_elt (stream,i))->sequence) {
784 lseek (LOCAL->fd,elt->private.special.offset,L_SET);
785 /* number of bytes to copy */
786 k = elt->private.special.text.size + elt->rfc822_size;
787 do { /* read from source position */
788 j = min (k,LOCAL->buflen);
789 read (LOCAL->fd,LOCAL->buf,j);
790 if (write (fd,LOCAL->buf,j) < 0) ret = NIL;
791 } while (ret && (k -= j));/* until done */
792 }
793 /* make sure all the updates take */
794 if (!(ret && (ret = !fsync (fd)))) {
795 sprintf (LOCAL->buf,"Unable to write message: %s",strerror (errno));
796 mm_log (LOCAL->buf,ERROR);
797 ftruncate (fd,sbuf.st_size);
798 }
799 /* set atime to now-1 if successful copy */
800 if (ret) times.actime = time (0) - 1;
801 /* else preserved \Marked status */
802 else times.actime = (sbuf.st_ctime > sbuf.st_atime) ?
803 sbuf.st_atime : time (0);
804 times.modtime = sbuf.st_mtime;/* preserve mtime */
805 utime (file,×); /* set the times */
806 unlockfd (ld,lock); /* release exclusive parse/append permission */
807 close (fd); /* close the file */
808 mm_nocritical (stream); /* release critical */
809 /* delete all requested messages */
810 if (ret && (options & CP_MOVE)) {
811 for (i = 1; i <= stream->nmsgs; i++)
812 if ((elt = mtx_elt (stream,i))->sequence) {
813 elt->deleted = T; /* mark message deleted */
814 /* recalculate status */
815 mtx_update_status (stream,i,NIL);
816 }
817 if (!stream->rdonly) { /* make sure the update takes */
818 fsync (LOCAL->fd);
819 fstat (LOCAL->fd,&sbuf); /* get current write time */
820 times.modtime = LOCAL->filetime = sbuf.st_mtime;
821 times.actime = time (0); /* make sure atime remains greater */
822 utime (stream->mailbox,×);
823 }
824 }
825 if (ret && mail_parameters (NIL,GET_COPYUID,NIL))
826 mm_log ("Can not return meaningful COPYUID with this mailbox format",WARN);
827 return ret;
828 }
830 /* MTX mail append message from stringstruct
831 * Accepts: MAIL stream
832 * destination mailbox
833 * append callback
834 * data for callback
835 * Returns: T if append successful, else NIL
836 */
838 long mtx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
839 {
840 struct stat sbuf;
841 int fd,ld,c;
842 char *flags,*date,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
843 struct utimbuf times;
844 FILE *df;
845 MESSAGECACHE elt;
846 long f;
847 unsigned long i,uf;
848 STRING *message;
849 long ret = LONGT;
850 /* default stream to prototype */
851 if (!stream) stream = &mtxproto;
852 /* make sure valid mailbox */
853 if (!mtx_isvalid (mailbox,file)) switch (errno) {
854 case ENOENT: /* no such file? */
855 if (!compare_cstring (mailbox,"INBOX")) mtx_create (NIL,"INBOX");
856 else {
857 mm_notify (stream,"[TRYCREATE] Must create mailbox before append",NIL);
858 return NIL;
859 }
860 /* falls through */
861 case 0: /* merely empty file? */
862 break;
863 case EACCES: /* file protected */
864 sprintf (tmp,"Can't access destination: %.80s",mailbox);
865 MM_LOG (tmp,ERROR);
866 return NIL;
867 case EINVAL:
868 sprintf (tmp,"Invalid MTX-format mailbox name: %.80s",mailbox);
869 mm_log (tmp,ERROR);
870 return NIL;
871 default:
872 sprintf (tmp,"Not a MTX-format mailbox: %.80s",mailbox);
873 mm_log (tmp,ERROR);
874 return NIL;
875 }
876 /* get first message */
877 if (!(*af) (stream,data,&flags,&date,&message)) return NIL;
879 /* open destination mailbox */
880 if (((fd = open (file,O_BINARY|O_WRONLY|O_APPEND|O_CREAT,S_IREAD|S_IWRITE))
881 < 0) || !(df = fdopen (fd,"ab"))) {
882 sprintf (tmp,"Can't open append mailbox: %s",strerror (errno));
883 mm_log (tmp,ERROR);
884 return NIL;
885 }
886 /* get parse/append permission */
887 if (flock (fd,LOCK_SH) || ((ld = lockname (lock,file,LOCK_EX)) < 0)) {
888 mm_log ("Unable to lock append mailbox",ERROR);
889 close (fd);
890 return NIL;
891 }
892 mm_critical (stream); /* go critical */
893 fstat (fd,&sbuf); /* get current file size */
894 errno = 0;
895 do { /* parse flags */
896 if (!SIZE (message)) { /* guard against zero-length */
897 mm_log ("Append of zero-length message",ERROR);
898 ret = NIL;
899 break;
900 }
901 f = mail_parse_flags (stream,flags,&i);
902 /* reverse bits (dontcha wish we had CIRC?) */
903 for (uf = 0; i; uf |= 1 << (29 - find_rightmost_bit (&i)));
904 if (date) { /* parse date if given */
905 if (!mail_parse_date (&elt,date)) {
906 sprintf (tmp,"Bad date in append: %.80s",date);
907 mm_log (tmp,ERROR);
908 ret = NIL; /* mark failure */
909 break;
910 }
911 mail_date (tmp,&elt); /* write preseved date */
912 }
913 else internal_date (tmp); /* get current date in IMAP format */
914 /* write header */
915 if (fprintf (df,"%s,%lu;%010lo%02lo\015\012",tmp,i = SIZE (message),uf,
916 (unsigned long) f) < 0) ret = NIL;
917 else { /* write message */
918 if (i) do c = 0xff & SNX (message);
919 while ((putc (c,df) != EOF) && --i);
920 /* get next message */
921 if (i || !(*af) (stream,data,&flags,&date,&message)) ret = NIL;
922 }
923 } while (ret && message);
924 /* if error... */
925 if (!ret || (fflush (df) == EOF)) {
926 ftruncate (fd,sbuf.st_size);/* revert file */
927 close (fd); /* make sure fclose() doesn't corrupt us */
928 if (errno) {
929 sprintf (tmp,"Message append failed: %s",strerror (errno));
930 mm_log (tmp,ERROR);
931 }
932 ret = NIL;
933 }
934 if (ret) times.actime = time (0) - 1;
935 /* else preserved \Marked status */
936 else times.actime = (sbuf.st_ctime > sbuf.st_atime) ?
937 sbuf.st_atime : time (0);
938 times.modtime = sbuf.st_mtime;/* preserve mtime */
939 utime (file,×); /* set the times */
940 fclose (df); /* close the file */
941 unlockfd (ld,lock); /* release exclusive parse/append permission */
942 mm_nocritical (stream); /* release critical */
943 if (ret && mail_parameters (NIL,GET_APPENDUID,NIL))
944 mm_log ("Can not return meaningful APPENDUID with this mailbox format",
945 WARN);
946 return ret;
947 }
949 /* Internal routines */
952 /* MTX mail parse mailbox
953 * Accepts: MAIL stream
954 * Returns: T if parse OK
955 * NIL if failure, stream aborted
956 */
958 long mtx_parse (MAILSTREAM *stream)
959 {
960 struct stat sbuf;
961 MESSAGECACHE *elt = NIL;
962 unsigned char c,*s,*t,*x;
963 char tmp[MAILTMPLEN];
964 unsigned long i,j;
965 long curpos = LOCAL->filesize;
966 long nmsgs = stream->nmsgs;
967 long recent = stream->recent;
968 short added = NIL;
969 short silent = stream->silent;
970 fstat (LOCAL->fd,&sbuf); /* get status */
971 if (sbuf.st_size < curpos) { /* sanity check */
972 sprintf (tmp,"Mailbox shrank from %ld to %ld!",curpos,sbuf.st_size);
973 mm_log (tmp,ERROR);
974 mtx_close (stream,NIL);
975 return NIL;
976 }
977 stream->silent = T; /* don't pass up mm_exists() events yet */
978 while (sbuf.st_size - curpos){/* while there is stuff to parse */
979 /* get to that position in the file */
980 lseek (LOCAL->fd,curpos,L_SET);
981 if ((i = read (LOCAL->fd,LOCAL->buf,64)) <= 0) {
982 sprintf (tmp,"Unable to read internal header at %lu, size = %lu: %s",
983 (unsigned long) curpos,(unsigned long) sbuf.st_size,
984 i ? strerror (errno) : "no data read");
985 mm_log (tmp,ERROR);
986 mtx_close (stream,NIL);
987 return NIL;
988 }
989 LOCAL->buf[i] = '\0'; /* tie off buffer just in case */
990 if (!((s = strchr (LOCAL->buf,'\015')) && (s[1] == '\012'))) {
991 sprintf (tmp,"Unable to find CRLF at %lu in %lu bytes, text: %s",
992 (unsigned long) curpos,i,(char *) LOCAL->buf);
993 mm_log (tmp,ERROR);
994 mtx_close (stream,NIL);
995 return NIL;
996 }
997 *s = '\0'; /* tie off header line */
998 i = (s + 2) - LOCAL->buf; /* note start of text offset */
999 if (!((s = strchr (LOCAL->buf,',')) && (t = strchr (s+1,';')))) {
1000 sprintf (tmp,"Unable to parse internal header at %lu: %s",
1001 (unsigned long) curpos,(char *) LOCAL->buf);
1002 mm_log (tmp,ERROR);
1003 mtx_close (stream,NIL);
1004 return NIL;
1005 }
1006 *s++ = '\0'; *t++ = '\0'; /* tie off fields */
1008 added = T; /* note that a new message was added */
1009 /* swell the cache */
1010 mail_exists (stream,++nmsgs);
1011 /* instantiate an elt for this message */
1012 (elt = mail_elt (stream,nmsgs))->valid = T;
1013 elt->private.uid = ++stream->uid_last;
1014 /* note file offset of header */
1015 elt->private.special.offset = curpos;
1016 /* in case error */
1017 elt->private.special.text.size = 0;
1018 /* header size not known yet */
1019 elt->private.msg.header.text.size = 0;
1020 x = s; /* parse the header components */
1021 if (mail_parse_date (elt,LOCAL->buf) &&
1022 (elt->rfc822_size = strtoul (s,(char **) &s,10)) && (!(s && *s)) &&
1023 isdigit (t[0]) && isdigit (t[1]) && isdigit (t[2]) &&
1024 isdigit (t[3]) && isdigit (t[4]) && isdigit (t[5]) &&
1025 isdigit (t[6]) && isdigit (t[7]) && isdigit (t[8]) &&
1026 isdigit (t[9]) && isdigit (t[10]) && isdigit (t[11]) && !t[12])
1027 elt->private.special.text.size = i;
1028 else { /* oops */
1029 sprintf (tmp,"Unable to parse internal header elements at %ld: %s,%s;%s",
1030 curpos,(char *) LOCAL->buf,(char *) x,(char *) t);
1031 mm_log (tmp,ERROR);
1032 mtx_close (stream,NIL);
1033 return NIL;
1034 }
1035 /* make sure didn't run off end of file */
1036 if ((curpos += (elt->rfc822_size + i)) > sbuf.st_size) {
1037 sprintf (tmp,"Last message (at %lu) runs past end of file (%lu > %lu)",
1038 elt->private.special.offset,(unsigned long) curpos,
1039 (unsigned long) sbuf.st_size);
1040 mm_log (tmp,ERROR);
1041 mtx_close (stream,NIL);
1042 return NIL;
1043 }
1044 c = t[10]; /* remember first system flags byte */
1045 t[10] = '\0'; /* tie off flags */
1046 j = strtoul (t,NIL,8); /* get user flags value */
1047 t[10] = c; /* restore first system flags byte */
1048 /* set up all valid user flags (reversed!) */
1049 while (j) if (((i = 29 - find_rightmost_bit (&j)) < NUSERFLAGS) &&
1050 stream->user_flags[i]) elt->user_flags |= 1 << i;
1051 /* calculate system flags */
1052 if ((j = ((t[10]-'0') * 8) + t[11]-'0') & fSEEN) elt->seen = T;
1053 if (j & fDELETED) elt->deleted = T;
1054 if (j & fFLAGGED) elt->flagged = T;
1055 if (j & fANSWERED) elt->answered = T;
1056 if (j & fDRAFT) elt->draft = T;
1057 if (!(j & fOLD)) { /* newly arrived message? */
1058 elt->recent = T;
1059 recent++; /* count up a new recent message */
1060 /* mark it as old */
1061 mtx_update_status (stream,nmsgs,NIL);
1062 }
1063 }
1064 fsync (LOCAL->fd); /* make sure all the fOLD flags take */
1065 /* update parsed file size and time */
1066 LOCAL->filesize = sbuf.st_size;
1067 fstat (LOCAL->fd,&sbuf); /* get status again to ensure time is right */
1068 LOCAL->filetime = sbuf.st_mtime;
1069 if (added && !stream->rdonly){/* make sure atime updated */
1070 struct utimbuf times;
1071 times.actime = time (0);
1072 times.modtime = LOCAL->filetime;
1073 utime (stream->mailbox,×);
1074 }
1075 stream->silent = silent; /* can pass up events now */
1076 mail_exists (stream,nmsgs); /* notify upper level of new mailbox size */
1077 mail_recent (stream,recent); /* and of change in recent messages */
1078 return LONGT; /* return the winnage */
1079 }
1081 /* MTX get cache element with status updating from file
1082 * Accepts: MAIL stream
1083 * message number
1084 * Returns: cache element
1085 */
1087 MESSAGECACHE *mtx_elt (MAILSTREAM *stream,unsigned long msgno)
1088 {
1089 MESSAGECACHE *elt = mail_elt (stream,msgno);
1090 struct { /* old flags */
1091 unsigned int seen : 1;
1092 unsigned int deleted : 1;
1093 unsigned int flagged : 1;
1094 unsigned int answered : 1;
1095 unsigned int draft : 1;
1096 unsigned long user_flags;
1097 } old;
1098 old.seen = elt->seen; old.deleted = elt->deleted; old.flagged = elt->flagged;
1099 old.answered = elt->answered; old.draft = elt->draft;
1100 old.user_flags = elt->user_flags;
1101 mtx_read_flags (stream,elt);
1102 if ((old.seen != elt->seen) || (old.deleted != elt->deleted) ||
1103 (old.flagged != elt->flagged) || (old.answered != elt->answered) ||
1104 (old.draft != elt->draft) || (old.user_flags != elt->user_flags))
1105 mm_flags (stream,msgno); /* let top level know */
1106 return elt;
1107 }
1109 /* MTX read flags from file
1110 * Accepts: MAIL stream
1111 * Returns: cache element
1112 */
1114 void mtx_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt)
1115 {
1116 unsigned long i,j;
1117 /* noop if readonly and have valid flags */
1118 if (stream->rdonly && elt->valid) return;
1119 /* set the seek pointer */
1120 lseek (LOCAL->fd,(off_t) elt->private.special.offset +
1121 elt->private.special.text.size - 14,L_SET);
1122 /* read the new flags */
1123 if (read (LOCAL->fd,LOCAL->buf,12) < 0) {
1124 sprintf (LOCAL->buf,"Unable to read new status: %s",strerror (errno));
1125 fatal (LOCAL->buf);
1126 }
1127 /* calculate system flags */
1128 i = (((LOCAL->buf[10]-'0') * 8) + LOCAL->buf[11]-'0');
1129 elt->seen = i & fSEEN ? T : NIL; elt->deleted = i & fDELETED ? T : NIL;
1130 elt->flagged = i & fFLAGGED ? T : NIL;
1131 elt->answered = i & fANSWERED ? T : NIL; elt->draft = i & fDRAFT ? T : NIL;
1132 LOCAL->buf[10] = '\0'; /* tie off flags */
1133 j = strtoul(LOCAL->buf,NIL,8);/* get user flags value */
1134 /* set up all valid user flags (reversed!) */
1135 while (j) if (((i = 29 - find_rightmost_bit (&j)) < NUSERFLAGS) &&
1136 stream->user_flags[i]) elt->user_flags |= 1 << i;
1137 elt->valid = T; /* have valid flags now */
1138 }
1140 /* MTX update status string
1141 * Accepts: MAIL stream
1142 * message number
1143 * flag saying whether or not to sync
1144 */
1146 void mtx_update_status (MAILSTREAM *stream,unsigned long msgno,long syncflag)
1147 {
1148 struct utimbuf times;
1149 struct stat sbuf;
1150 MESSAGECACHE *elt = mail_elt (stream,msgno);
1151 unsigned long j,k = 0;
1152 /* readonly */
1153 if (stream->rdonly || !elt->valid) mtx_read_flags (stream,elt);
1154 else { /* readwrite */
1155 j = elt->user_flags; /* get user flags */
1156 /* reverse bits (dontcha wish we had CIRC?) */
1157 while (j) k |= 1 << (29 - find_rightmost_bit (&j));
1158 /* print new flag string */
1159 sprintf (LOCAL->buf,"%010lo%02o",k,(unsigned)
1160 (fOLD + (fSEEN * elt->seen) + (fDELETED * elt->deleted) +
1161 (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
1162 (fDRAFT * elt->draft)));
1163 while (T) { /* get to that place in the file */
1164 lseek (LOCAL->fd,(off_t) elt->private.special.offset +
1165 elt->private.special.text.size - 14,L_SET);
1166 /* write new flags */
1167 if (write (LOCAL->fd,LOCAL->buf,12) > 0) break;
1168 mm_notify (stream,strerror (errno),WARN);
1169 mm_diskerror (stream,errno,T);
1170 }
1171 if (syncflag) { /* sync if requested */
1172 fsync (LOCAL->fd);
1173 fstat (LOCAL->fd,&sbuf); /* get new write time */
1174 times.modtime = LOCAL->filetime = sbuf.st_mtime;
1175 times.actime = time (0); /* make sure read is later */
1176 utime (stream->mailbox,×);
1177 }
1178 }
1179 }
1181 /* MTX locate header for a message
1182 * Accepts: MAIL stream
1183 * message number
1184 * pointer to returned header size
1185 * Returns: position of header in file
1186 */
1188 unsigned long mtx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
1189 unsigned long *size)
1190 {
1191 unsigned long siz;
1192 long i = 0;
1193 int q = 0;
1194 char *s,tmp[MAILTMPLEN];
1195 MESSAGECACHE *elt = mtx_elt (stream,msgno);
1196 unsigned long ret = elt->private.special.offset +
1197 elt->private.special.text.size;
1198 /* is header size known? */
1199 if (!(*size = elt->private.msg.header.text.size)) {
1200 lseek (LOCAL->fd,ret,L_SET);/* get to header position */
1201 /* search message for CRLF CRLF */
1202 for (siz = 1,s = tmp; siz <= elt->rfc822_size; siz++) {
1203 /* read another buffer as necessary */
1204 if ((--i <= 0) && /* buffer empty? */
1205 (read (LOCAL->fd,s = tmp,
1206 i = min (elt->rfc822_size - siz,(long) MAILTMPLEN)) < 0))
1207 return ret; /* I/O error? */
1208 switch (q) { /* sniff at buffer */
1209 case 0: /* first character */
1210 q = (*s++ == '\015') ? 1 : 0;
1211 break;
1212 case 1: /* second character */
1213 q = (*s++ == '\012') ? 2 : 0;
1214 break;
1215 case 2: /* third character */
1216 q = (*s++ == '\015') ? 3 : 0;
1217 break;
1218 case 3: /* fourth character */
1219 if (*s++ == '\012') { /* have the sequence? */
1220 /* yes, note for later */
1221 elt->private.msg.header.text.size = *size = siz;
1222 return ret;
1223 }
1224 q = 0; /* lost... */
1225 break;
1226 }
1227 }
1228 /* header consumes entire message */
1229 elt->private.msg.header.text.size = *size = elt->rfc822_size;
1230 }
1231 return ret;
1232 }