From: Unknown <>
Date: Thu, 31 Aug 2006 00:44:55 +0000 (+0000)
Subject: add files for 2006-08-31T00:44:55Z
X-Git-Tag: imap-2007a1~351
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=54e5236f9e2616c061548c51d6a67b1cf7f57410;p=uw-imap

add files for 2006-08-31T00:44:55Z
---

diff --git a/src/osdep/dos/mtxdos.c b/src/osdep/dos/mtxdos.c
new file mode 100644
index 0000000..ad96926
--- /dev/null
+++ b/src/osdep/dos/mtxdos.c
@@ -0,0 +1,875 @@
+/* ========================================================================
+ * 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:	MTX 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
+ */
+
+
+#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"
+
+/* MTX I/O stream local data */
+	
+typedef struct mtx_local {
+  int fd;			/* file descriptor for I/O */
+  off_t filesize;		/* file size parsed */
+  unsigned char *buf;		/* temporary buffer */
+} MTXLOCAL;
+
+
+/* Drive-dependent data passed to init method */
+
+typedef struct mtx_data {
+  int fd;			/* file data */
+  unsigned long pos;		/* initial position */
+} MTXDATA;
+
+
+/* Convenient access to local data */
+
+#define LOCAL ((MTXLOCAL *) stream->local)
+
+
+/* Function prototypes */
+
+DRIVER *mtx_valid (char *name);
+long mtx_isvalid (char *name,char *tmp);
+void *mtx_parameters (long function,void *value);
+void mtx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
+void mtx_list (MAILSTREAM *stream,char *ref,char *pat);
+void mtx_lsub (MAILSTREAM *stream,char *ref,char *pat);
+long mtx_create (MAILSTREAM *stream,char *mailbox);
+long mtx_delete (MAILSTREAM *stream,char *mailbox);
+long mtx_rename (MAILSTREAM *stream,char *old,char *newname);
+MAILSTREAM *mtx_open (MAILSTREAM *stream);
+void mtx_close (MAILSTREAM *stream,long options);
+char *mtx_header (MAILSTREAM *stream,unsigned long msgno,
+		  unsigned long *length,long flags);
+long mtx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
+void mtx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
+long mtx_ping (MAILSTREAM *stream);
+void mtx_check (MAILSTREAM *stream);
+long mtx_expunge (MAILSTREAM *stream,char *sequence,long options);
+long mtx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
+long mtx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
+
+char *mtx_file (char *dst,char *name);
+long mtx_badname (char *tmp,char *s);
+long mtx_parse (MAILSTREAM *stream);
+void mtx_update_status (MAILSTREAM *stream,unsigned long msgno);
+unsigned long mtx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
+			  unsigned long *size);
+
+/* MTX mail routines */
+
+
+/* Driver dispatch used by MAIL */
+
+DRIVER mtxdriver = {
+  "mtx",			/* driver name */
+				/* driver flags */
+  DR_LOCAL|DR_MAIL|DR_LOWMEM|DR_CRLF|DR_NOSTICKY,
+  (DRIVER *) NIL,		/* next driver */
+  mtx_valid,			/* mailbox is valid for us */
+  mtx_parameters,		/* manipulate parameters */
+  mtx_scan,			/* scan mailboxes */
+  mtx_list,			/* list mailboxes */
+  mtx_lsub,			/* list subscribed mailboxes */
+  NIL,				/* subscribe to mailbox */
+  NIL,				/* unsubscribe from mailbox */
+  mtx_create,			/* create mailbox */
+  mtx_delete,			/* delete mailbox */
+  mtx_rename,			/* rename mailbox */
+  mail_status_default,		/* status of mailbox */
+  mtx_open,			/* open mailbox */
+  mtx_close,			/* close mailbox */
+  NIL,				/* fetch message "fast" attributes */
+  NIL,				/* fetch message flags */
+  NIL,				/* fetch overview */
+  NIL,				/* fetch message envelopes */
+  mtx_header,			/* fetch message header */
+  mtx_text,			/* fetch message body */
+  NIL,				/* fetch partial message text */
+  NIL,				/* unique identifier */
+  NIL,				/* message number */
+  NIL,				/* modify flags */
+  mtx_flagmsg,			/* per-message modify flags */
+  NIL,				/* search for message based on criteria */
+  NIL,				/* sort messages */
+  NIL,				/* thread messages */
+  mtx_ping,			/* ping mailbox to see if still alive */
+  mtx_check,			/* check for new messages */
+  mtx_expunge,			/* expunge deleted messages */
+  mtx_copy,			/* copy messages to another mailbox */
+  mtx_append,			/* append string message to mailbox */
+  NIL				/* garbage collect stream */
+};
+
+				/* prototype stream */
+MAILSTREAM mtxproto = {&mtxdriver};
+
+/* MTX mail validate mailbox
+ * Accepts: mailbox name
+ * Returns: our driver if name is valid, NIL otherwise
+ */
+
+DRIVER *mtx_valid (char *name)
+{
+  char tmp[MAILTMPLEN];
+  return mtx_isvalid (name,tmp) ? &mtxdriver : (DRIVER *) NIL;
+}
+
+
+/* MTX mail test for valid mailbox
+ * Accepts: mailbox name
+ * Returns: T if valid, NIL otherwise
+ */
+
+long mtx_isvalid (char *name,char *tmp)
+{
+  int fd;
+  long ret = NIL;
+  char *s;
+  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);
+      if ((read (fd,tmp,64) >= 0) && (s = strchr (tmp,'\015')) &&
+	  (s[1] == '\012')) {	/* valid format? */
+	*s = '\0';		/* tie off header */
+				/* must begin with dd-mmm-yy" */
+	ret = (((tmp[2] == '-' && tmp[6] == '-') ||
+		(tmp[1] == '-' && tmp[5] == '-')) &&
+	       (s = strchr (tmp+18,',')) && strchr (s+2,';')) ? T : NIL;
+      }
+      else errno = -1;		/* bogus format */
+      close (fd);		/* close the file */
+    }
+  }
+				/* in case INBOX but not mtx 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 */
+}
+
+
+/* MTX manipulate driver parameters
+ * Accepts: function code
+ *	    function-dependent value
+ * Returns: function-dependent return value
+ */
+
+void *mtx_parameters (long function,void *value)
+{
+  return NIL;
+}
+
+/* MTX mail scan mailboxes
+ * Accepts: mail stream
+ *	    reference
+ *	    pattern to search
+ *	    string to scan
+ */
+
+void mtx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
+{
+  if (stream) dummy_scan (NIL,ref,pat,contents);
+}
+
+
+/* MTX mail list mailboxes
+ * Accepts: mail stream
+ *	    reference
+ *	    pattern to search
+ */
+
+void mtx_list (MAILSTREAM *stream,char *ref,char *pat)
+{
+  if (stream) dummy_list (stream,ref,pat);
+}
+
+
+/* MTX mail list subscribed mailboxes
+ * Accepts: mail stream
+ *	    reference
+ *	    pattern to search
+ */
+
+void mtx_lsub (MAILSTREAM *stream,char *ref,char *pat)
+{
+  if (stream) dummy_lsub (stream,ref,pat);
+}
+
+/* MTX mail create mailbox
+ * Accepts: MAIL stream
+ *	    mailbox name to create
+ * Returns: T on success, NIL on failure
+ */
+
+long mtx_create (MAILSTREAM *stream,char *mailbox)
+{
+  return dummy_create (stream,mailbox);
+}
+
+
+/* MTX mail delete mailbox
+ * Accepts: MAIL stream
+ *	    mailbox name to delete
+ * Returns: T on success, NIL on failure
+ */
+
+long mtx_delete (MAILSTREAM *stream,char *mailbox)
+{
+  return dummy_delete (stream,mailbox);
+}
+
+
+/* MTX mail rename mailbox
+ * Accepts: MAIL stream
+ *	    old mailbox name
+ *	    new mailbox name (or NIL for delete)
+ * Returns: T on success, NIL on failure
+ */
+
+long mtx_rename (MAILSTREAM *stream,char *old,char *newname)
+{
+  return dummy_rename (stream,old,newname);
+}
+
+/* MTX mail open
+ * Accepts: stream to open
+ * Returns: stream on success, NIL on failure
+ */
+
+MAILSTREAM *mtx_open (MAILSTREAM *stream)
+{
+  long i;
+  int fd;
+  char *s;
+  char tmp[MAILTMPLEN];
+				/* return prototype for OP_PROTOTYPE call */
+  if (!stream) return &mtxproto;
+  if (stream->local) fatal ("mtx recycle stream");
+  if (!mailboxfile (tmp,stream->mailbox))
+    return (MAILSTREAM *) mtx_badname (tmp,stream->mailbox);
+				/* open, possibly creating INBOX */
+  if (((fd = open (tmp,O_BINARY|(stream->rdonly ? O_RDONLY:O_RDWR),NIL)) < 0)&&
+      (compare_cstring (stream->mailbox,"INBOX") ||
+       ((fd = open (tmp,O_BINARY|O_RDWR|O_CREAT|O_EXCL,S_IREAD|S_IWRITE))<0))){
+    sprintf (tmp,"Can't open mailbox: %s",strerror (errno));
+    mm_log (tmp,ERROR);
+    return NIL;
+  }
+  stream->local = fs_get (sizeof (MTXLOCAL));
+				/* 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 (!mtx_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 =
+      stream->rdonly ? NIL : T;
+  stream->perm_user_flags = stream->rdonly ? NIL : 0xffffffff;
+  return stream;		/* return stream to caller */
+}
+
+/* MTX mail close
+ * Accepts: MAIL stream
+ *	    close options
+ */
+
+void mtx_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) mtx_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 */
+  }
+}
+
+/* MTX 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 *mtx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
+		  long flags)
+{
+  *length = 0;			/* default to empty */
+  if (flags & FT_UID) return "";/* UID call "impossible" */
+				/* get to header position */
+  lseek (LOCAL->fd,mtx_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;
+}
+
+
+/* MTX mail fetch message text (body only)
+ * Accepts: MAIL stream
+ *	    message # to fetch
+ *	    pointer to returned header text length
+ *	    option flags
+ * Returns: T, always
+ */
+
+long mtx_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 */
+  if (elt->seen && !(flags & FT_PEEK)) {
+    elt->seen = T;		/* mark message as seen */
+				/* recalculate status */
+    mtx_update_status (stream,msgno);
+    mm_flags (stream,msgno);
+  }
+				/* get location of text data */
+  hdrpos = mtx_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 */
+}
+
+/* MTX mail per-message modify flags
+ * Accepts: MAIL stream
+ *	    message cache element
+ */
+
+void mtx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
+{
+				/* recalculate status */
+  mtx_update_status (stream,elt->msgno);
+}
+
+
+/* MTX mail ping mailbox
+ * Accepts: MAIL stream
+ * Returns: T if stream still alive, NIL if not
+ */
+
+long mtx_ping (MAILSTREAM *stream)
+{
+				/* punt if stream no longer alive */
+  if (!(stream && LOCAL)) return NIL;
+				/* parse mailbox, punt if parse dies */
+  return (mtx_parse (stream)) ? T : NIL;
+}
+
+
+/* MTX mail check mailbox (reparses status too)
+ * Accepts: MAIL stream
+ */
+
+void mtx_check (MAILSTREAM *stream)
+{
+  unsigned long i = 1;
+  if (mtx_ping (stream)) {	/* ping mailbox */
+				/* get new message status */
+    while (i <= stream->nmsgs) mail_elt (stream,i++);
+    mm_log ("Check completed",(long) NIL);
+  }
+}
+
+/* MTX mail expunge mailbox
+ * Accepts: MAIL stream
+ *	    sequence to expunge if non-NIL
+ *	    expunge options
+ * Returns: T, always
+ */
+
+long mtx_expunge (MAILSTREAM *stream,char *sequence,long options)
+{
+  long ret;
+  unsigned long i = 1;
+  unsigned long j,k,m,recent;
+  unsigned long n = 0;
+  unsigned long delta = 0;
+  MESSAGECACHE *elt;
+  char tmp[MAILTMPLEN];
+  if (!(ret = (sequence ? ((options & EX_UID) ?
+			   mail_uid_sequence (stream,sequence) :
+			   mail_sequence (stream,sequence)) : LONGT) &&
+	mtx_ping (stream)));	/* parse sequence if given, ping stream */
+  else if (stream->rdonly) mm_log ("Expunge ignored on readonly mailbox",WARN);
+  else {
+    mm_critical (stream);	/* go critical */
+    recent = stream->recent;	/* get recent now that pinged */ 
+    while (i <= stream->nmsgs) {/* for each message */
+      elt = mail_elt (stream,i);/* get cache element */
+				/* number of bytes to smash or preserve */
+      k = elt->private.special.text.size + elt->rfc822_size;
+				/* if need to expunge this message */
+      if (elt->deleted && (sequence ? elt->sequence : T)) {
+				/* if recent, note one less recent message */
+	if (elt->recent) --recent;
+	delta += k;		/* number of bytes to delete */
+				/* notify upper levels */
+	mail_expunged (stream,i);
+	n++;			/* count up one more deleted message */
+      }
+      else if (i++ && delta) {	/* preserved message */
+				/* first byte to preserve */
+	j = elt->private.special.offset;
+	do {			/* read from source position */
+	  m = min (k,(unsigned long) MAILTMPLEN);
+	  lseek (LOCAL->fd,j,SEEK_SET);
+	  read (LOCAL->fd,tmp,(size_t) m);
+				/* write to destination position */
+	  lseek (LOCAL->fd,j - delta,SEEK_SET);
+	  write (LOCAL->fd,tmp,(size_t) m);
+	  j += m;		/* next chunk, perhaps */
+	} while (k -= m);	/* until done */
+	elt->private.special.offset -= delta;
+      }
+    }
+    if (n) {			/* truncate file after last message */
+      chsize (LOCAL->fd,LOCAL->filesize -= delta);
+      sprintf (tmp,"Expunged %ld messages",n);
+      mm_log (tmp,(long) NIL);	/* output the news */
+    }
+    else mm_log ("No messages deleted, so no update needed",(long) NIL);
+    mm_nocritical (stream);	/* release critical */
+				/* notify upper level of new mailbox size */
+    mail_exists (stream,stream->nmsgs);
+    mail_recent (stream,recent);
+  }
+  return ret;
+}
+
+/* MTX mail copy message(s)
+ * Accepts: MAIL stream
+ *	    sequence
+ *	    destination mailbox
+ *	    copy options
+ * Returns: T if success, NIL if failed
+ */
+
+long mtx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
+{
+  char tmp[MAILTMPLEN];
+  struct stat sbuf;
+  MESSAGECACHE *elt;
+  unsigned long i,j,k;
+  long ret = LONGT;
+  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;
+  if (!mtx_isvalid (mailbox,tmp)) switch (errno) {
+  case ENOENT:			/* no such file? */
+    mm_notify (stream,"[TRYCREATE] Must create mailbox before append",
+	       (long) NIL);
+    return NIL;
+  case 0:			/* merely empty file? */
+    break;
+  case EINVAL:			/* name is bogus */
+    if (pc) return (*pc) (stream,sequence,mailbox,options);
+    return mtx_badname (tmp,mailbox);
+  default:			/* file exists, but not valid format */
+    if (pc) return (*pc) (stream,sequence,mailbox,options);
+    sprintf (tmp,"Not a MTX-format mailbox: %s",mailbox);
+    mm_log (tmp,ERROR);
+    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; ret && (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 */
+      k = elt->private.special.text.size + elt->rfc822_size;
+      do {			/* read from source position */
+	j = min (k,(long) MAILTMPLEN);
+	read (LOCAL->fd,tmp,(size_t) j);
+	if (write (fd,tmp,(size_t) j) < 0) {
+	  sprintf (tmp,"Unable to write message: %s",strerror (errno));
+	  mm_log (tmp,ERROR);
+	  chsize (fd,sbuf.st_size);
+	  j = k;
+	  ret = NIL;		/* note error */
+	  break;
+	}
+      } while (k -= j);		/* until done */
+    }
+  close (fd);			/* close the file */
+  mm_nocritical (stream);	/* release critical */
+				/* delete all requested messages */
+  if (ret && (options & CP_MOVE)) for (i = 1; i <= stream->nmsgs; i++)
+    if ((elt = mail_elt (stream,i))->sequence) {
+      elt->deleted = T;		/* mark message deleted */
+				/* recalculate status */
+      mtx_update_status (stream,i);
+    }
+  if (ret && mail_parameters (NIL,GET_COPYUID,NIL))
+    mm_log ("Can not return meaningful COPYUID with this mailbox format",WARN);
+  return ret;
+}
+
+/* MTX mail append message from stringstruct
+ * Accepts: MAIL stream
+ *	    destination mailbox
+ *	    append callback
+ *	    data for callback
+ * Returns: T if append successful, else NIL
+ */
+
+long mtx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
+{
+  struct stat sbuf;
+  int fd,ld,c;
+  char *flags,*date,tmp[MAILTMPLEN],file[MAILTMPLEN];
+  FILE *df;
+  MESSAGECACHE elt;
+  long f;
+  unsigned long i,uf;
+  STRING *message;
+  long ret = LONGT;
+				/* default stream to prototype */
+  if (!stream) stream = &mtxproto;
+				/* make sure valid mailbox */
+  if (!mtx_isvalid (mailbox,tmp)) switch (errno) {
+  case ENOENT:			/* no such file? */
+    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])
+      dummy_create (NIL,"INBOX.MTX");
+    else {
+      mm_notify (stream,"[TRYCREATE] Must create mailbox before append",NIL);
+      return NIL;
+    }
+				/* falls through */
+  case 0:			/* merely empty file? */
+    break;
+  case EINVAL:
+    return mtx_badname (tmp,mailbox);
+  default:
+    sprintf (tmp,"Not a MTX-format mailbox: %.80s",mailbox);
+    mm_log (tmp,ERROR);
+    return NIL;
+  }
+				/* get first message */
+  if (!(*af) (stream,data,&flags,&date,&message)) return NIL;
+				/* open destination mailbox */
+  if (!mailboxfile (file,mailbox) ||
+      ((fd = open (file,O_BINARY|O_WRONLY|O_APPEND|O_CREAT,
+		   S_IREAD|S_IWRITE)) < 0) || !(df = fdopen (fd,"ab"))) {
+    sprintf (tmp,"Can't open append mailbox: %s",strerror (errno));
+    mm_log (tmp,ERROR);
+    return NIL;
+  }
+  mm_critical (stream);		/* go critical */
+  fstat (fd,&sbuf);		/* get current file size */
+
+  errno = 0;
+  do {				/* parse flags */
+    if (!SIZE (message)) {	/* guard against zero-length */
+      mm_log ("Append of zero-length message",ERROR);
+      ret = NIL;
+      break;
+    }
+    f = mail_parse_flags (stream,flags,&i);
+				/* reverse bits (dontcha wish we had CIRC?) */
+    for (uf = 0; i; uf |= 1 << (29 - find_rightmost_bit (&i)));
+    if (date) {			/* parse date if given */
+      if (!mail_parse_date (&elt,date)) {
+	sprintf (tmp,"Bad date in append: %.80s",date);
+	mm_log (tmp,ERROR);
+	ret = NIL;		/* mark failure */
+	break;
+      }
+      mail_date (tmp,&elt);	/* write preseved date */
+    }
+    else internal_date (tmp);	/* get current date in IMAP format */
+				/* write header */
+    if (fprintf (df,"%s,%lu;%010lo%02lo\015\012",tmp,i = SIZE (message),uf,
+		 (unsigned long) f) < 0) ret = NIL;
+    else {			/* write message */
+      if (i) do c = 0xff & SNX (message);
+      while ((putc (c,df) != EOF) && --i);
+				/* get next message */
+      if (i || !(*af) (stream,data,&flags,&date,&message)) ret = NIL;
+    }
+  } while (ret && message);
+				/* revert file if failure */
+  if (!ret || (fflush (df) == EOF)) {
+    chsize (fd,sbuf.st_size);	/* revert file */
+    close (fd);			/* make sure fclose() doesn't corrupt us */
+    if (errno) {
+      sprintf (tmp,"Message append failed: %s",strerror (errno));
+      mm_log (tmp,ERROR);
+    }
+    ret = NIL;
+  }
+  fclose (df);			/* close the file */ 
+  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;
+}
+
+
+/* Return bad file name error message
+ * Accepts: temporary buffer
+ *	    file name
+ * Returns: long NIL always
+ */
+
+long mtx_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 mtx_parse (MAILSTREAM *stream)
+{
+  struct stat sbuf;
+  MESSAGECACHE *elt = NIL;
+  unsigned char *s,*t,*x,lbuf[65];
+  char tmp[MAILTMPLEN];
+  long i;
+  long curpos = LOCAL->filesize;
+  long nmsgs = stream->nmsgs;
+  long recent = stream->recent;
+  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);
+    mtx_close (stream,NIL);
+    return NIL;
+  }
+				/* while there is stuff to parse */
+  while (i = sbuf.st_size - curpos) {
+				/* get to that position in the file */
+    lseek (LOCAL->fd,curpos,SEEK_SET);
+    if ((i = read (LOCAL->fd,lbuf,64)) <= 0) {
+      sprintf (tmp,"Unable to read internal header at %ld, size = %ld: %s",
+	       curpos,sbuf.st_size,i ? strerror (errno) : "no data read");
+      mm_log (tmp,ERROR);
+      mtx_close (stream,NIL);
+      return NIL;
+    }
+    lbuf[i] = '\0';		/* tie off buffer just in case */
+    if (!((s = strchr (lbuf,'\015')) && (s[1] == '\012'))) {
+      sprintf (tmp,"Unable to find end of line at %ld in %ld bytes, text: %s",
+	       curpos,i,(char *) lbuf);
+      mm_log (tmp,ERROR);
+      mtx_close (stream,NIL);
+      return NIL;
+    }
+    *s = '\0';			/* tie off header line */
+    i = (s + 2) - lbuf;		/* note start of text offset */
+    if (!((s = strchr (lbuf,',')) && (t = strchr (s+1,';')))) {
+      sprintf (tmp,"Unable to parse internal header at %ld: %s",curpos,
+	       (char *) lbuf);
+      mm_log (tmp,ERROR);
+      mtx_close (stream,NIL);
+      return NIL;
+    }
+
+    *s++ = '\0'; *t++ = '\0';	/* tie off fields */
+				/* intantiate 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;
+				/* as well as offset from header of message */
+    elt->private.special.text.size = i;
+				/* header size not known yet */
+    elt->private.msg.header.text.size = 0;
+				/* parse the header components */
+    if (!(mail_parse_date (elt,lbuf) &&
+	  (elt->rfc822_size = strtol (x = s,(char **) &s,10)) && (!(s && *s))&&
+	  isdigit (t[0]) && isdigit (t[1]) && isdigit (t[2]) &&
+	  isdigit (t[3]) && isdigit (t[4]) && isdigit (t[5]) &&
+	  isdigit (t[6]) && isdigit (t[7]) && isdigit (t[8]) &&
+	  isdigit (t[9]) && isdigit (t[10]) && isdigit (t[11]) && !t[12])) {
+      sprintf (tmp,"Unable to parse internal header elements at %ld: %s,%s;%s",
+	       curpos,(char *) lbuf,(char *) x,(char *) t);
+      mtx_close (stream,NIL);
+      return NIL;
+    }
+				/* update current position to next header */
+    curpos += i + elt->rfc822_size;
+				/* calculate system flags */
+    if ((i = ((t[10]-'0') * 8) + t[11]-'0') & fSEEN) elt->seen = T;
+    if (i & fDELETED) elt->deleted = T;
+    if (i & fFLAGGED) elt->flagged = T;
+    if (i & fANSWERED) elt->answered = T;
+    if (i & fDRAFT) elt->draft = T;
+    if (curpos > sbuf.st_size) {
+      sprintf (tmp,"Last message (at %lu) runs past end of file (%lu > %lu)",
+	       elt->private.special.offset,curpos,sbuf.st_size);
+      mm_log (tmp,ERROR);
+      mtx_close (stream,NIL);
+      return NIL;
+    }
+  }
+				/* update parsed file size */
+  LOCAL->filesize = sbuf.st_size;
+  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 */
+}
+
+/* Update status string
+ * Accepts: MAIL stream
+ *	    message number
+ */
+
+void mtx_update_status (MAILSTREAM *stream,unsigned long msgno)
+{
+  char tmp[MAILTMPLEN];
+  MESSAGECACHE *elt = mail_elt (stream,msgno);
+  unsigned long j,k = 0;
+				/* not if readonly you don't */
+  if (stream->rdonly || !elt->valid) return;
+  j = elt->user_flags;		/* get user flags */
+				/* reverse bits (dontcha wish we had CIRC?) */
+  while (j) k |= 1 << 29 - find_rightmost_bit (&j);
+  sprintf (tmp,"%010lo%02o",k,	/* print new flag string */
+	   fOLD + (fSEEN * elt->seen) + (fDELETED * elt->deleted) +
+	   (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
+	   (fDRAFT * elt->draft));
+				/* get to that place in the file */
+  lseek (LOCAL->fd,(off_t) elt->private.special.offset +
+	 elt->private.special.text.size - 14,SEEK_SET);
+  write (LOCAL->fd,tmp,12);	/* write new flags */
+}
+
+/* MTX locate header for a message
+ * Accepts: MAIL stream
+ *	    message number
+ *	    pointer to returned header size
+ * Returns: position of header in file
+ */
+
+unsigned long mtx_hdrpos (MAILSTREAM *stream,unsigned long msgno,
+			  unsigned long *size)
+{
+  unsigned long siz;
+  size_t i = 0;
+  int q = 0;
+  char *s,tmp[MAILTMPLEN];
+  MESSAGECACHE *elt = mail_elt (stream,msgno);
+  long pos = elt->private.special.offset + elt->private.special.text.size;
+				/* is header 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--;
+      switch (q) {		/* sniff at buffer */
+      case 0:			/* first character */
+	q = (*s++ == '\015') ? 1 : 0;
+	break;
+      case 1:			/* second character */
+	q = (*s++ == '\012') ? 2 : 0;
+	break;
+      case 2:			/* third character */
+	q = (*s++ == '\015') ? 3 : 0;
+	break;
+      case 3:			/* fourth character */
+	if (*s++ == '\012') {	/* have the sequence? */
+				/* yes, note for later */
+	  elt->private.msg.header.text.size = (*size = siz);
+	  return pos;		/* return to caller */
+	}
+	q = 0;			/* lost... */
+	break;
+      }
+    }
+  }
+  return pos;			/* have position */
+}