unix.c

这是用C编写IMAP源代码

		break;
	      case 'A':		/* message answered */
		elt->answered = T;
		break;
	      case 'T':		/* message is a draft */
		elt->draft = T;
		break;
	      default:		/* some other crap */
		break;
	      } while (*s && (*s != '\n') && ((*s != '\r') || (s[1] != '\n')));
	      break;		/* all done */
	    }
				/* otherwise fall into default case */

	  default:		/* ordinary header line */
	    if ((*s == 'S') || (*s == 's') ||
		(((*s == 'X') || (*s == 'x')) && (s[1] == '-'))) {
	      unsigned char *e,*v;
				/* must match what mail_filter() does */
	      for (u = s,v = tmp,e = u + min (i,MAILTMPLEN - 1);
		   (u < e) && ((c = (*u ? *u : (*u = ' '))) != ':') &&
		   ((c > ' ') || ((c != ' ') && (c != '\t') &&
				  (c != '\015') && (c != '\012')));
		   *v++ = *u++);
	      *v = '\0';	/* tie off */
				/* matches internal header? */
	      if (!compare_cstring (tmp,"STATUS") ||
		  !compare_cstring (tmp,"X-STATUS") ||
		  !compare_cstring (tmp,"X-KEYWORDS") ||
		  !compare_cstring (tmp,"X-UID") ||
		  !compare_cstring (tmp,"X-IMAP") ||
		  !compare_cstring (tmp,"X-IMAPBASE")) {
		char err[MAILTMPLEN];
		sprintf (err,"Discarding bogus %s header in message %lu",
			 (char *) tmp,elt->msgno);
		MM_LOG (err,WARN);
		retain = NIL;	/* don't retain continuation */
		break;		/* different case or something */
	      }
	    }
				/* retain or non-continuation? */
	    if (retain || ((*s != ' ') && (*s != '\t'))) {
	      retain = T;	/* retaining continuation now */
				/* line length in LF format newline */
	      k = i - (((i >= 2) && (s[i - 2] == '\r')) ? 1 : 0);
				/* "internal" header size */
	      elt->private.data += k;
				/* message size */
	      elt->rfc822_size += k + 1;
	    }
	    else {
	      char err[MAILTMPLEN];
	      sprintf (err,"Discarding bogus continuation in msg %lu: %.80s",
		      elt->msgno,(char *) s);
	      if (u = strpbrk (err,"\r\n")) *u = '\0';
	      MM_LOG (err,WARN);
	      break;		/* different case or something */
	    }
	    break;
	  }
	} while (i && (*t != '\n') && ((*t != '\r') || (t[1] != '\n')));
				/* "internal" header sans trailing newline */
	if (i) elt->private.data--;
				/* assign a UID if none found */
	if (((nmsgs > 1) || !pseudoseen) && !elt->private.uid) {
	  prevuid = elt->private.uid = ++stream->uid_last;
	  elt->private.dirty = T;
	}
	else elt->private.dirty = elt->recent;

				/* note size of header, location of text */
	elt->private.msg.header.text.size = 
	  (elt->private.msg.text.offset =
	   (LOCAL->filesize + GETPOS (&bs)) - elt->private.special.offset) -
	     elt->private.special.text.size;
	k = m = 0;		/* no previous line size yet */
				/* note current position */
	j = LOCAL->filesize + GETPOS (&bs);
	if (i) do {		/* look for next message */
	  s = unix_mbxline (stream,&bs,&i);
	  if (i) {		/* got new data? */
	    VALID (s,t,ti,zn);	/* yes, parse line */
	    if (!ti) {		/* not a header line, add it to message */
	      elt->rfc822_size += 
		k = i + (m = (((i < 2) || s[i - 2] != '\r') ? 1 : 0));
				/* update current position */
	      j = LOCAL->filesize + GETPOS (&bs);
	    }
	  }
	} while (i && !ti);	/* until found a header */
	elt->private.msg.text.text.size = j -
	  (elt->private.special.offset + elt->private.msg.text.offset);
	if (k == 2) {		/* last line was blank? */
	  elt->private.msg.text.text.size -= (m ? 1 : 2);
	  elt->rfc822_size -= 2;
	}
      } while (i);		/* until end of buffer */
      if (pseudoseen) {		/* flush pseudo-message if present */
				/* decrement recent count */
	if (mail_elt (stream,1)->recent) recent--;
				/* and the exists count */
	mail_exists (stream,nmsgs--);
	mail_expunged(stream,1);/* fake an expunge of that message */
      }
				/* need to start a new UID validity? */
      if (!stream->uid_validity) {
	stream->uid_validity = time (0);
				/* in case a whiner with no life */
	if (mail_parameters (NIL,GET_USERHASNOLIFE,NIL))
	  stream->uid_nosticky = T;
	else if (nmsgs) {	/* don't bother if empty file */
	  LOCAL->dirty = T;	/* make dirty to restart UID epoch */
				/* need to rewrite msg 1 if not pseudo */
	  if (!LOCAL->pseudo) mail_elt (stream,1)->private.dirty = T;
	  MM_LOG ("Assigning new unique identifiers to all messages",NIL);
	}
      }
      stream->nmsgs = oldnmsgs;	/* whack it back down */
      stream->silent = silent;	/* restore old silent setting */
				/* notify upper level of new mailbox sizes */
      mail_exists (stream,nmsgs);
      mail_recent (stream,recent);
				/* mark dirty so O flags are set */
      if (recent) LOCAL->dirty = T;
    }
  }
				/* no change, don't babble if never got time */
  else if (LOCAL->filetime && LOCAL->filetime != sbuf.st_mtime)
    MM_LOG ("New mailbox modification time but apparently no changes",WARN);
				/* update parsed file size and time */
  LOCAL->filesize = sbuf.st_size;
  LOCAL->filetime = sbuf.st_mtime;
  return T;			/* return the winnage */
}

/* UNIX read line from mailbox
 * Accepts: mail stream
 *	    stringstruct
 *	    pointer to line size
 * Returns: pointer to input line
 */

char *unix_mbxline (MAILSTREAM *stream,STRING *bs,unsigned long *size)
{
  unsigned long i,j,k,m;
  char *s,*t,*te,p1[CHUNK];
  char *ret = "";
				/* flush old buffer */
  if (LOCAL->line) fs_give ((void **) &LOCAL->line);
				/* if buffer needs refreshing */
  if (!bs->cursize) SETPOS (bs,GETPOS (bs));
  if (SIZE (bs)) {		/* find newline */
				/* end of fast scan */
    te = (t = (s = bs->curpos) + bs->cursize) - 12;
    while (s < te) if ((*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
		       (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
		       (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
		       (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n')) {
      --s;			/* back up */
      break;			/* exit loop */
    }
				/* final character-at-a-time scan */
    while ((s < t) && (*s != '\n')) ++s;
				/* difficult case if line spans buffer */
    if ((i = s - bs->curpos) == bs->cursize) {
      memcpy (p1,bs->curpos,i);	/* remember what we have so far */
				/* load next buffer */
      SETPOS (bs,k = GETPOS (bs) + i);
				/* end of fast scan */
      te = (t = (s = bs->curpos) + bs->cursize) - 12;
				/* fast scan in overlap buffer */
      while (s < te) if ((*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
			 (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
			 (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
			 (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n')) {
	--s;			/* back up */
	break;			/* exit loop */
      }
				/* final character-at-a-time scan */
      while ((s < t) && (*s != '\n')) ++s;
				/* huge line? */
      if ((j = s - bs->curpos) == bs->cursize) {
	SETPOS (bs,GETPOS (bs) + j);
				/* look for end of line (s-l-o-w!!) */
	for (m = SIZE (bs); m && (SNX (bs) != '\n'); --m,++j);
	SETPOS (bs,k);		/* go back to where it started */
      }

				/* got size of data, make buffer for return */
      ret = LOCAL->line = (char *) fs_get (i + j + 2);
      memcpy (ret,p1,i);	/* copy first chunk */
      while (j) {		/* copy remainder */
	if (!bs->cursize) SETPOS (bs,GETPOS (bs));
	memcpy (ret + i,bs->curpos,k = min (j,bs->cursize));
	i += k;			/* account for this much read in */
	j -= k;
	bs->curpos += k;	/* increment new position */
	bs->cursize -= k;	/* eat that many bytes */
      }
      if (!bs->cursize) SETPOS (bs,GETPOS (bs));
      if (SIZE (bs)) SNX (bs);	/* skip over newline if one seen */
      ret[i++] = '\n';		/* make sure newline at end */
      ret[i] = '\0';		/* makes debugging easier */
    }
    else {			/* this is easy */
      ret = bs->curpos;		/* string it at this position */
      bs->curpos += ++i;	/* increment new position */
      bs->cursize -= i;		/* eat that many bytes */
    }
    *size = i;			/* return that to user */
  }
  else *size = 0;		/* end of data, return empty */
  return ret;
}

/* UNIX make pseudo-header
 * Accepts: MAIL stream
 *	    buffer to write pseudo-header
 * Returns: length of pseudo-header
 */

unsigned long unix_pseudo (MAILSTREAM *stream,char *hdr)
{
  int i;
  char *s,tmp[MAILTMPLEN];
  time_t now = time (0);
  rfc822_fixed_date (tmp);
  sprintf (hdr,"From %s %.24s\nDate: %s\nFrom: %s <%s@%.80s>\nSubject: %s\nMessage-ID: <%lu@%.80s>\nX-IMAP: %010lu %010lu",
	   pseudo_from,ctime (&now),
	   tmp,pseudo_name,pseudo_from,mylocalhost (),pseudo_subject,
	   (unsigned long) now,mylocalhost (),stream->uid_validity,
	   stream->uid_last);
  for (s = hdr + strlen (hdr),i = 0; i < NUSERFLAGS; ++i)
    if (stream->user_flags[i])
      sprintf (s += strlen (s)," %s",stream->user_flags[i]);
  sprintf (s += strlen (s),"\nStatus: RO\n\n%s\n\n",pseudo_msg);
  return strlen (hdr);		/* return header length */
}

/* UNIX make status string
 * Accepts: MAIL stream
 *	    destination string to write
 *	    message cache entry
 *	    non-zero flag to write UID (.LT. 0 to write UID base info too)
 * Returns: length of string
 */

unsigned long unix_xstatus (MAILSTREAM *stream,char *status,MESSAGECACHE *elt,
			    long flag)
{
  char *t,stack[64];
  char *s = status;
  unsigned long n;
  int pad = 50;
  /* This used to use sprintf(), but thanks to certain cretinous C libraries
     with horribly slow implementations of sprintf() I had to change it to this
     mess.  At least it should be fast. */
				/* need to write X-IMAPbase: header? */
  if ((flag < 0) && !stream->uid_nosticky) {
    *s++ = 'X'; *s++ = '-'; *s++ = 'I'; *s++ = 'M'; *s++ = 'A'; *s++ = 'P';
    *s++ = 'b'; *s++ = 'a'; *s++ = 's'; *s++ = 'e'; *s++ = ':'; *s++ = ' ';
    t = stack;
    n = stream->uid_validity;	/* push UID validity digits on the stack */
    do *t++ = (char) (n % 10) + '0';
    while (n /= 10);
				/* pop UID validity digits from stack */
    while (t > stack) *s++ = *--t;
    *s++ = ' ';
    n = stream->uid_last;	/* push UID last digits on the stack */
    do *t++ = (char) (n % 10) + '0';
    while (n /= 10);
				/* pop UID last digits from stack */
    while (t > stack) *s++ = *--t;
    for (n = 0; n < NUSERFLAGS; ++n) if (t = stream->user_flags[n])
      for (*s++ = ' '; *t; *s++ = *t++);
    *s++ = '\n';
    pad += 30;			/* increased padding if have IMAPbase */
  }
  *s++ = 'S'; *s++ = 't'; *s++ = 'a'; *s++ = 't'; *s++ = 'u'; *s++ = 's';
  *s++ = ':'; *s++ = ' ';
  if (elt->seen) *s++ = 'R';
  if (flag) *s++ = 'O';		/* only write O if have a UID */
  *s++ = '\n';
  *s++ = 'X'; *s++ = '-'; *s++ = 'S'; *s++ = 't'; *s++ = 'a'; *s++ = 't';
  *s++ = 'u'; *s++ = 's'; *s++ = ':'; *s++ = ' ';
  if (elt->deleted) *s++ = 'D';
  if (elt->flagged) *s++ = 'F';
  if (elt->answered) *s++ = 'A';
  if (elt->draft) *s++ = 'T';
  *s++ = '\n';

  if (!stream->uid_nosticky) {	/* cretins with no life can't use this */
    *s++ = 'X'; *s++ = '-'; *s++ = 'K'; *s++ = 'e'; *s++ = 'y'; *s++ = 'w';
    *s++ = 'o'; *s++ = 'r'; *s++ = 'd'; *s++ = 's'; *s++ = ':';
    if (n = elt->user_flags) do {
      *s++ = ' ';
      for (t = stream->user_flags[find_rightmost_bit (&n)]; *t; *s++ = *t++);
    } while (n);
    n = s - status;		/* get size of stuff so far */
				/* pad X-Keywords to make size constant */
    if (n < pad) for (n = pad - n; n > 0; --n) *s++ = ' ';
    *s++ = '\n';
    if (flag) {			/* want to include UID? */
      t = stack;
      n = elt->private.uid;	/* push UID digits on the stack */
      do *t++ = (char) (n % 10) + '0';
      while (n /= 10);
      *s++ = 'X'; *s++ = '-'; *s++ = 'U'; *s++ = 'I'; *s++ = 'D'; *s++ = ':';
      *s++ = ' ';
				/* pop UID from stack */
      while (t > stack) *s++ = *--t;
      *s++ = '\n';
    }
  }
  *s++ = '\n'; *s = '\0';	/* end of extended message status */
  return s - status;		/* return size of resulting string */
}

/* Rewrite mailbox file
 * Accepts: MAIL stream, must be critical and locked
 *	    return pointer to number of expunged messages if want expunge
 *	    lock file name
 * Returns: T if success and mailbox unlocked, NIL if failure
 */

#define OVERFLOWBUFLEN 8192	/* initial overflow buffer length */

long unix_rewrite (MAILSTREAM *stream,unsigned long *nexp,DOTLOCK *lock)
{
  MESSAGECACHE *elt;
  UNIXFILE f;
  char *s;
  time_t tp[2];
  long ret,flag;
  unsigned long i,j;
  unsigned long recent = stream->recent;
  unsigned long size = LOCAL->pseudo ? unix_pseudo (stream,LOCAL->buf) : 0;
  if (nexp) *nexp = 0;		/* initially nothing expunged */
				/* calculate size of mailbox after rewrite */
  for (i = 1,flag = LOCAL->pseudo ? 1 : -1; i <= stream->nmsgs; i++)
    if (!(elt = mail_elt (stream,i))->deleted || !nexp) {
				/* add RFC822 size of this message */
      size += elt->private.special.text.size + elt->private.data +
	unix_xstatus (stream,LOCAL->buf,elt,flag) +
	  elt->private.msg.text.text.size + 1;
      flag = 1;			/* only count X-IMAPbase once */
    }
				/* no messages, has a life, and no pseudo */
  if (!size && !mail_parameters (NIL,GET_USERHASNOLIFE,NIL)) {
    LOCAL->pseudo = T;		/* so make a pseudo-message now */
    size = unix_pseudo (stream,LOCAL->buf);
  }
				/* extend the file as necessary */
  if (ret = unix_extend (stream,size)) {
    /* Set up buffered I/O file structure
     * curpos	current position being written through buffering
     * filepos	current position being written physically to the disk
     * bufpos	current position being written in the buffer
     * protect	current maximum position that can be written to the disk
     *		before buffering is forced
     * The code tries to buffer so that that disk is written in multiples of
     * OVERBLOWBUFLEN bytes.
     */
    f.stream = stream;		/* note mail stream */
    f.curpos = f.filepos = 0;	/* start of file */
    f.protect = stream->nmsgs ?	/* initial protection pointer */
    mail_elt (stream,1)->private.special.offset : 8192;
    f.bufpos = f.buf = (char *) fs_get (f.buflen = OVERFLOWBUFLEN);

    if (LOCAL->pseudo)		/* update pseudo-header */
      unix_write (&f,LOCAL->buf,unix_pseudo (stream,LOCAL->buf));
				/* loop through all messages */
    for (i = 1,flag = LOCAL->pseudo ? 1 : -1; i <= st