Initial Alpine Version

1 files changed, 1287 insertions, 0 deletions

diff --git a/imap/src/osdep/unix/mx.c b/imap/src/osdep/unix/mx.c
new file mode 100644
index 00000000..45495279
--- /dev/null
+++ b/imap/src/osdep/unix/mx.c
@@ -0,0 +1,1287 @@
+/* ========================================================================
+ * Copyright 1988-2008 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:	MX mail routines
+ *
+ * Author(s):	Mark Crispin
+ *		Networks and Distributed Computing
+ *		Computing & Communications
+ *		University of Washington
+ *		Administration Building, AG-44
+ *		Seattle, WA  98195
+ *		Internet: MRC@CAC.Washington.EDU
+ *
+ * Date:	3 May 1996
+ * Last Edited:	6 January 2008
+ */
+
+
+#include <stdio.h>
+#include <ctype.h>
+#include <errno.h>
+extern int errno;		/* just in case */
+#include "mail.h"
+#include "osdep.h"
+#include <pwd.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include "misc.h"
+#include "dummy.h"
+#include "fdstring.h"
+
+/* Index file */
+
+#define MXINDEXNAME "/.mxindex"
+#define MXINDEX(d,s) strcat (mx_file (d,s),MXINDEXNAME)
+
+
+/* MX I/O stream local data */
+	
+typedef struct mx_local {
+  int fd;			/* file descriptor of open index */
+  unsigned char *buf;		/* temporary buffer */
+  unsigned long buflen;		/* current size of temporary buffer */
+  unsigned long cachedtexts;	/* total size of all cached texts */
+  time_t scantime;		/* last time directory scanned */
+} MXLOCAL;
+
+
+/* Convenient access to local data */
+
+#define LOCAL ((MXLOCAL *) stream->local)
+
+
+/* Function prototypes */
+
+DRIVER *mx_valid (char *name);
+int mx_isvalid (char *name,char *tmp);
+int mx_namevalid (char *name);
+void *mx_parameters (long function,void *value);
+long mx_dirfmttest (char *name);
+void mx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
+long mx_scan_contents (char *name,char *contents,unsigned long csiz,
+		       unsigned long fsiz);
+void mx_list (MAILSTREAM *stream,char *ref,char *pat);
+void mx_lsub (MAILSTREAM *stream,char *ref,char *pat);
+long mx_subscribe (MAILSTREAM *stream,char *mailbox);
+long mx_unsubscribe (MAILSTREAM *stream,char *mailbox);
+long mx_create (MAILSTREAM *stream,char *mailbox);
+long mx_delete (MAILSTREAM *stream,char *mailbox);
+long mx_rename (MAILSTREAM *stream,char *old,char *newname);
+int mx_rename_work (char *src,size_t srcl,char *dst,size_t dstl,char *name);
+MAILSTREAM *mx_open (MAILSTREAM *stream);
+void mx_close (MAILSTREAM *stream,long options);
+void mx_fast (MAILSTREAM *stream,char *sequence,long flags);
+char *mx_fast_work (MAILSTREAM *stream,MESSAGECACHE *elt);
+char *mx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
+		 long flags);
+long mx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
+void mx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags);
+void mx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
+long mx_ping (MAILSTREAM *stream);
+void mx_check (MAILSTREAM *stream);
+long mx_expunge (MAILSTREAM *stream,char *sequence,long options);
+long mx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,
+	      long options);
+long mx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
+long mx_append_msg (MAILSTREAM *stream,char *flags,MESSAGECACHE *elt,
+		    STRING *st,SEARCHSET *set);
+
+int mx_select (struct direct *name);
+int mx_numsort (const void *d1,const void *d2);
+char *mx_file (char *dst,char *name);
+long mx_lockindex (MAILSTREAM *stream);
+void mx_unlockindex (MAILSTREAM *stream);
+void mx_setdate (char *file,MESSAGECACHE *elt);
+
+
+/* MX mail routines */
+
+
+/* Driver dispatch used by MAIL */
+
+DRIVER mxdriver = {
+  "mx",				/* driver name */
+				/* driver flags */
+  DR_MAIL|DR_LOCAL|DR_NOFAST|DR_CRLF|DR_LOCKING|DR_DIRFMT,
+  (DRIVER *) NIL,		/* next driver */
+  mx_valid,			/* mailbox is valid for us */
+  mx_parameters,		/* manipulate parameters */
+  mx_scan,			/* scan mailboxes */
+  mx_list,			/* find mailboxes */
+  mx_lsub,			/* find subscribed mailboxes */
+  mx_subscribe,			/* subscribe to mailbox */
+  mx_unsubscribe,		/* unsubscribe from mailbox */
+  mx_create,			/* create mailbox */
+  mx_delete,			/* delete mailbox */
+  mx_rename,			/* rename mailbox */
+  mail_status_default,		/* status of mailbox */
+  mx_open,			/* open mailbox */
+  mx_close,			/* close mailbox */
+  mx_fast,			/* fetch message "fast" attributes */
+  NIL,				/* fetch message flags */
+  NIL,				/* fetch overview */
+  NIL,				/* fetch message envelopes */
+  mx_header,			/* fetch message header only */
+  mx_text,			/* fetch message body only */
+  NIL,				/* fetch partial message test */
+  NIL,				/* unique identifier */
+  NIL,				/* message number */
+  mx_flag,			/* modify flags */
+  mx_flagmsg,			/* per-message modify flags */
+  NIL,				/* search for message based on criteria */
+  NIL,				/* sort messages */
+  NIL,				/* thread messages */
+  mx_ping,			/* ping mailbox to see if still alive */
+  mx_check,			/* check for new messages */
+  mx_expunge,			/* expunge deleted messages */
+  mx_copy,			/* copy messages to another mailbox */
+  mx_append,			/* append string message to mailbox */
+  NIL				/* garbage collect stream */
+};
+
+				/* prototype stream */
+MAILSTREAM mxproto = {&mxdriver};
+
+/* MX mail validate mailbox
+ * Accepts: mailbox name
+ * Returns: our driver if name is valid, NIL otherwise
+ */
+
+DRIVER *mx_valid (char *name)
+{
+  char tmp[MAILTMPLEN];
+  return mx_isvalid (name,tmp) ? &mxdriver : NIL;
+}
+
+
+/* MX mail test for valid mailbox
+ * Accepts: mailbox name
+ *	    temporary buffer to use
+ * Returns: T if valid, NIL otherwise with errno holding dir stat error
+ */
+
+int mx_isvalid (char *name,char *tmp)
+{
+  struct stat sbuf;
+  errno = NIL;			/* zap error */
+  if ((strlen (name) <= NETMAXMBX) && *mx_file (tmp,name) &&
+      !stat (tmp,&sbuf) && ((sbuf.st_mode & S_IFMT) == S_IFDIR)) {
+				/* name is directory; is it mx? */
+    if (!stat (MXINDEX (tmp,name),&sbuf) &&
+	((sbuf.st_mode & S_IFMT) == S_IFREG)) return T;
+    errno = NIL;		/* directory but not mx */
+  }
+  else if (!compare_cstring (name,"INBOX")) errno = NIL;
+  return NIL;
+}
+
+
+/* MX mail test for valid mailbox
+ * Accepts: mailbox name
+ * Returns: T if valid, NIL otherwise
+ */
+
+int mx_namevalid (char *name)
+{
+  char *s = (*name == '/') ? name + 1 : name;
+  while (s && *s) {		/* make sure valid name */
+    if (isdigit (*s)) s++;	/* digit, check this node further... */
+    else if (*s == '/') break;	/* all digit node, barf */
+				/* non-digit, skip to next node or return */
+    else if (!((s = strchr (s+1,'/')) && *++s)) return T;
+  }
+  return NIL;			/* all numeric or empty node */
+}
+
+/* MX manipulate driver parameters
+ * Accepts: function code
+ *	    function-dependent value
+ * Returns: function-dependent return value
+ */
+
+void *mx_parameters (long function,void *value)
+{
+  void *ret = NIL;
+  switch ((int) function) {
+  case GET_INBOXPATH:
+    if (value) ret = mailboxfile ((char *) value,"~/INBOX");
+    break;
+  case GET_DIRFMTTEST:
+    ret = (void *) mx_dirfmttest;
+    break;
+  case GET_SCANCONTENTS:
+    ret = (void *) mx_scan_contents;
+    break;
+  }
+  return ret;
+}
+
+
+/* MX test for directory format internal node
+ * Accepts: candidate node name
+ * Returns: T if internal name, NIL otherwise
+ */
+
+long mx_dirfmttest (char *name)
+{
+  int c;
+				/* success if index name or all-numberic */
+  if (strcmp (name,MXINDEXNAME+1))
+    while (c = *name++) if (!isdigit (c)) return NIL;
+  return LONGT;
+}
+
+/* MX scan mailboxes
+ * Accepts: mail stream
+ *	    reference
+ *	    pattern to search
+ *	    string to scan
+ */
+
+void mx_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
+{
+  if (stream) dummy_scan (NIL,ref,pat,contents);
+}
+
+
+/* MX scan mailbox for contents
+ * Accepts: mailbox name
+ *	    desired contents
+ *	    contents size
+ *	    file size (ignored)
+ * Returns: NIL if contents not found, T if found
+ */
+
+long mx_scan_contents (char *name,char *contents,unsigned long csiz,
+			unsigned long fsiz)
+{
+  long i,nfiles;
+  void *a;
+  char *s;
+  long ret = NIL;
+  size_t namelen = strlen (name);
+  struct stat sbuf;
+  struct direct **names = NIL;
+  if ((nfiles = scandir (name,&names,mx_select,mx_numsort)) > 0)
+    for (i = 0; i < nfiles; ++i) {
+      if (!ret) {
+	sprintf (s = (char *) fs_get (namelen + strlen (names[i]->d_name) + 2),
+		 "%s/%s",name,names[i]->d_name);
+	if (!stat (s,&sbuf) && (csiz <= sbuf.st_size))
+	  ret = dummy_scan_contents (s,contents,csiz,sbuf.st_size);
+	fs_give ((void **) &s);
+      }
+      fs_give ((void **) &names[i]);
+    }
+				/* free directory list */
+  if (a = (void *) names) fs_give ((void **) &a);
+  return ret;
+}
+
+/* MX list mailboxes
+ * Accepts: mail stream
+ *	    reference
+ *	    pattern to search
+ */
+
+void mx_list (MAILSTREAM *stream,char *ref,char *pat)
+{
+  if (stream) dummy_list (NIL,ref,pat);
+}
+
+
+/* MX list subscribed mailboxes
+ * Accepts: mail stream
+ *	    reference
+ *	    pattern to search
+ */
+
+void mx_lsub (MAILSTREAM *stream,char *ref,char *pat)
+{
+  if (stream) dummy_lsub (NIL,ref,pat);
+}
+
+/* MX mail subscribe to mailbox
+ * Accepts: mail stream
+ *	    mailbox to add to subscription list
+ * Returns: T on success, NIL on failure
+ */
+
+long mx_subscribe (MAILSTREAM *stream,char *mailbox)
+{
+  return sm_subscribe (mailbox);
+}
+
+
+/* MX mail unsubscribe to mailbox
+ * Accepts: mail stream
+ *	    mailbox to delete from subscription list
+ * Returns: T on success, NIL on failure
+ */
+
+long mx_unsubscribe (MAILSTREAM *stream,char *mailbox)
+{
+  return sm_unsubscribe (mailbox);
+}
+
+/* MX mail create mailbox
+ * Accepts: mail stream
+ *	    mailbox name to create
+ * Returns: T on success, NIL on failure
+ */
+
+long mx_create (MAILSTREAM *stream,char *mailbox)
+{
+  DRIVER *test;
+  int fd;
+  char *s,tmp[MAILTMPLEN];
+  int mask = umask (0);
+  long ret = NIL;
+  if (!mx_namevalid (mailbox))	/* validate name */
+    sprintf (tmp,"Can't create mailbox %.80s: invalid MX-format name",mailbox);
+				/* must not already exist */
+  else if ((test = mail_valid (NIL,mailbox,NIL)) &&
+	   strcmp (test->name,"dummy"))
+    sprintf (tmp,"Can't create mailbox %.80s: mailbox already exists",mailbox);
+				/* create directory */
+  else if (!dummy_create_path (stream,MXINDEX (tmp,mailbox),
+			       get_dir_protection (mailbox)))
+    sprintf (tmp,"Can't create mailbox %.80s: %s",mailbox,strerror (errno));
+  else {			/* success */
+				/* set index protection */
+    set_mbx_protections (mailbox,tmp);
+				/* tie off directory name */
+    *(s = strrchr (tmp,'/') + 1) = '\0';
+				/* set directory protection */
+    set_mbx_protections (mailbox,tmp);
+    ret = LONGT;
+  }
+  umask (mask);			/* restore mask */
+  if (!ret) MM_LOG (tmp,ERROR);	/* some error */
+  return ret;
+}
+
+/* MX mail delete mailbox
+ *	    mailbox name to delete
+ * Returns: T on success, NIL on failure
+ */
+
+long mx_delete (MAILSTREAM *stream,char *mailbox)
+{
+  DIR *dirp;
+  struct direct *d;
+  char *s;
+  char tmp[MAILTMPLEN];
+  if (!mx_isvalid (mailbox,tmp))
+    sprintf (tmp,"Can't delete mailbox %.80s: no such mailbox",mailbox);
+				/* delete index */
+  else if (unlink (MXINDEX (tmp,mailbox)))
+    sprintf (tmp,"Can't delete mailbox %.80s index: %s",
+	     mailbox,strerror (errno));
+  else {			/* get directory name */
+    *(s = strrchr (tmp,'/')) = '\0';
+    if (dirp = opendir (tmp)) {	/* open directory */
+      *s++ = '/';		/* restore delimiter */
+				/* massacre messages */
+      while (d = readdir (dirp)) if (mx_select (d)) {
+	strcpy (s,d->d_name);	/* make path */
+	unlink (tmp);		/* sayonara */
+      }
+      closedir (dirp);		/* flush directory */
+      *(s = strrchr (tmp,'/')) = '\0';
+      if (rmdir (tmp)) {	/* try to remove the directory */
+	sprintf (tmp,"Can't delete name %.80s: %s",mailbox,strerror (errno));
+	MM_LOG (tmp,WARN);
+      }
+    }
+    return T;			/* always success */
+  }
+  MM_LOG (tmp,ERROR);		/* something failed */
+  return NIL;
+}
+
+/* MX mail rename mailbox
+ * Accepts: MX mail stream
+ *	    old mailbox name
+ *	    new mailbox name
+ * Returns: T on success, NIL on failure
+ */
+
+long mx_rename (MAILSTREAM *stream,char *old,char *newname)
+{
+  char c,*s,tmp[MAILTMPLEN],tmp1[MAILTMPLEN];
+  struct stat sbuf;
+  if (!mx_isvalid (old,tmp))
+    sprintf (tmp,"Can't rename mailbox %.80s: no such mailbox",old);
+  else if (!mx_namevalid (newname))
+    sprintf (tmp,"Can't rename to mailbox %.80s: invalid MX-format name",
+	     newname);
+				/* new mailbox name must not be valid */
+  else if (mx_isvalid (newname,tmp))
+    sprintf (tmp,"Can't rename to mailbox %.80s: destination already exists",
+	     newname);
+  else {
+    mx_file (tmp,old);		/* build old directory name */
+    mx_file (tmp1,newname);	/* and new directory name */
+				/* easy if not INBOX */
+    if (compare_cstring (old,"INBOX")) {
+				/* found superior to destination name? */
+      if (s = strrchr (mx_file (tmp1,newname),'/')) {
+	c = *++s;	    /* remember first character of inferior */
+	*s = '\0';		/* tie off to get just superior */
+				/* name doesn't exist, create it */
+	if ((stat (tmp1,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) &&
+	    !dummy_create_path (stream,tmp1,get_dir_protection (newname)))
+	  return NIL;
+	*s = c;			/* restore full name */
+      }
+      if (!rename (tmp,tmp1)) return LONGT;
+    }
+
+				/* RFC 3501 requires this */
+    else if (dummy_create_path (stream,strcat (tmp1,"/"),
+				get_dir_protection (newname))) {
+      void *a;
+      int i,n,lasterror;
+      struct direct **names = NIL;
+      size_t srcl = strlen (tmp);
+      size_t dstl = strlen (tmp1);
+				/* rename each mx file to new directory */
+      for (i = lasterror = 0,n = scandir (tmp,&names,mx_select,mx_numsort);
+	   i < n; ++i) {
+	if (mx_rename_work (tmp,srcl,tmp1,dstl,names[i]->d_name))
+	  lasterror = errno;
+	fs_give ((void **) &names[i]);
+      }
+				/* free directory list */
+      if (a = (void *) names) fs_give ((void **) &a);
+      if (lasterror || mx_rename_work (tmp,srcl,tmp1,dstl,MXINDEXNAME+1))
+	errno = lasterror;
+      else return mx_create (NIL,"INBOX");
+    }
+    sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",
+	     old,newname,strerror (errno));
+  }
+  MM_LOG (tmp,ERROR);		/* something failed */
+  return NIL;
+}
+
+
+/* MX rename worker routine
+ * Accepts: source directory name
+ *	    source directory name length
+ *	    destination directory name
+ *	    destination directory name length
+ *	    name of node to move
+ * Returns: zero if success, non-zero if error
+ */
+
+int mx_rename_work (char *src,size_t srcl,char *dst,size_t dstl,char *name)
+{
+  int ret;
+  size_t len = strlen (name);
+  char *s = (char *) fs_get (srcl + len + 2);
+  char *d = (char *) fs_get (dstl + len + 1);
+  sprintf (s,"%s/%s",src,name);
+  sprintf (d,"%s%s",dst,name);
+  ret = rename (s,d);
+  fs_give ((void **) &s);
+  fs_give ((void **) &d);
+  return ret;
+}
+
+/* MX mail open
+ * Accepts: stream to open
+ * Returns: stream on success, NIL on failure
+ */
+
+MAILSTREAM *mx_open (MAILSTREAM *stream)
+{
+  char tmp[MAILTMPLEN];
+				/* return prototype for OP_PROTOTYPE call */
+  if (!stream) return user_flags (&mxproto);
+  if (stream->local) fatal ("mx recycle stream");
+  stream->local = fs_get (sizeof (MXLOCAL));
+				/* note if an INBOX or not */
+  stream->inbox = !compare_cstring (stream->mailbox,"INBOX");
+  mx_file (tmp,stream->mailbox);/* get directory name */
+				/* canonicalize mailbox name */
+  fs_give ((void **) &stream->mailbox);
+  stream->mailbox = cpystr (tmp);
+				/* make temporary buffer */
+  LOCAL->buf = (char *) fs_get (CHUNKSIZE);
+  LOCAL->buflen = CHUNKSIZE - 1;
+  LOCAL->scantime = 0;		/* not scanned yet */
+  LOCAL->fd = -1;		/* no index yet */
+  LOCAL->cachedtexts = 0;	/* no cached texts */
+  stream->sequence++;		/* bump sequence number */
+				/* parse mailbox */
+  stream->nmsgs = stream->recent = 0;
+  if (mx_ping (stream) && !(stream->nmsgs || stream->silent))
+    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;
+  stream->kwd_create = (stream->user_flags[NUSERFLAGS-1] || stream->rdonly) ?
+    NIL : T;			/* can we create new user flags? */
+  return stream;		/* return stream to caller */
+}
+
+/* MX mail close
+ * Accepts: MAIL stream
+ *	    close options
+ */
+
+void mx_close (MAILSTREAM *stream,long options)
+{
+  if (LOCAL) {			/* only if a file is open */
+    int silent = stream->silent;
+    stream->silent = T;		/* note this stream is dying */
+    if (options & CL_EXPUNGE) mx_expunge (stream,NIL,NIL);
+				/* free local scratch buffer */
+    if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
+				/* nuke the local data */
+    fs_give ((void **) &stream->local);
+    stream->dtb = NIL;		/* log out the DTB */
+    stream->silent = silent;	/* reset silent state */
+  }
+}
+
+/* MX mail fetch fast information
+ * Accepts: MAIL stream
+ *	    sequence
+ *	    option flags
+ */
+
+void mx_fast (MAILSTREAM *stream,char *sequence,long flags)
+{
+  unsigned long i;
+  MESSAGECACHE *elt;
+  if (stream && LOCAL &&
+      ((flags & FT_UID) ? mail_uid_sequence (stream,sequence) :
+       mail_sequence (stream,sequence)))
+    for (i = 1; i <= stream->nmsgs; i++)
+      if ((elt = mail_elt (stream,i))->sequence) mx_fast_work (stream,elt);
+}
+
+
+/* MX mail fetch fast information
+ * Accepts: MAIL stream
+ *	    message cache element
+ * Returns: name of message file
+ */
+
+char *mx_fast_work (MAILSTREAM *stream,MESSAGECACHE *elt)
+{
+  struct stat sbuf;
+  struct tm *tm;
+				/* build message file name */
+  sprintf (LOCAL->buf,"%s/%lu",stream->mailbox,elt->private.uid);
+				/* have size yet? */
+  if (!elt->rfc822_size && !stat (LOCAL->buf,&sbuf)) {
+				/* make plausible IMAPish date string */
+    tm = gmtime (&sbuf.st_mtime);
+    elt->day = tm->tm_mday; elt->month = tm->tm_mon + 1;
+    elt->year = tm->tm_year + 1900 - BASEYEAR;
+    elt->hours = tm->tm_hour; elt->minutes = tm->tm_min;
+    elt->seconds = tm->tm_sec;
+    elt->zhours = 0; elt->zminutes = 0; elt->zoccident = 0;
+    elt->rfc822_size = sbuf.st_size;
+  }
+  return (char *) LOCAL->buf;	/* return file name */
+}
+
+/* MX 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 *mx_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *length,
+		 long flags)
+{
+  unsigned long i;
+  int fd;
+  MESSAGECACHE *elt;
+  *length = 0;			/* default to empty */
+  if (flags & FT_UID) return "";/* UID call "impossible" */
+  elt = mail_elt (stream,msgno);/* get elt */
+  if (!elt->private.msg.header.text.data) {
+				/* purge cache if too big */
+    if (LOCAL->cachedtexts > max (stream->nmsgs * 4096,2097152)) {
+      mail_gc (stream,GC_TEXTS);/* just can't keep that much */
+      LOCAL->cachedtexts = 0;
+    }
+    if ((fd = open (mx_fast_work (stream,elt),O_RDONLY,NIL)) < 0) return "";
+				/* is buffer big enough? */
+    if (elt->rfc822_size > LOCAL->buflen) {
+      fs_give ((void **) &LOCAL->buf);
+      LOCAL->buf = (char *) fs_get ((LOCAL->buflen = elt->rfc822_size) + 1);
+    }
+				/* slurp message */
+    read (fd,LOCAL->buf,elt->rfc822_size);
+				/* tie off file */
+    LOCAL->buf[elt->rfc822_size] = '\0';
+    close (fd);			/* flush message file */
+				/* find end of header */
+    if (elt->rfc822_size < 4) i = 0;
+    else for (i = 4; (i < elt->rfc822_size) &&
+	      !((LOCAL->buf[i - 4] == '\015') &&
+		(LOCAL->buf[i - 3] == '\012') &&
+		(LOCAL->buf[i - 2] == '\015') &&
+		(LOCAL->buf[i - 1] == '\012')); i++);
+				/* copy header */
+    cpytxt (&elt->private.msg.header.text,LOCAL->buf,i);
+    cpytxt (&elt->private.msg.text.text,LOCAL->buf+i,elt->rfc822_size - i);
+				/* add to cached size */
+    LOCAL->cachedtexts += elt->rfc822_size;
+  }
+  *length = elt->private.msg.header.text.size;
+  return (char *) elt->private.msg.header.text.data;
+}
+
+/* MX mail fetch message text (body only)
+ * Accepts: MAIL stream
+ *	    message # to fetch
+ *	    pointer to returned stringstruct
+ *	    option flags
+ * Returns: T on success, NIL on failure
+ */
+
+long mx_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
+{
+  unsigned long i;
+  MESSAGECACHE *elt;
+				/* UID call "impossible" */
+  if (flags & FT_UID) return NIL;
+  elt = mail_elt (stream,msgno);
+				/* snarf message if don't have it yet */
+  if (!elt->private.msg.text.text.data) {
+    mx_header (stream,msgno,&i,flags);
+    if (!elt->private.msg.text.text.data) return NIL;
+  }
+				/* mark as seen */
+  if (!(flags & FT_PEEK) && mx_lockindex (stream)) {
+    elt->seen = T;
+    mx_unlockindex (stream);
+    MM_FLAGS (stream,msgno);
+  }
+  INIT (bs,mail_string,elt->private.msg.text.text.data,
+	elt->private.msg.text.text.size);
+  return T;
+}
+
+/* MX mail modify flags
+ * Accepts: MAIL stream
+ *	    sequence
+ *	    flag(s)
+ *	    option flags
+ */
+
+void mx_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags)
+{
+  mx_unlockindex (stream);	/* finished with index */
+}
+
+
+/* MX per-message modify flags
+ * Accepts: MAIL stream
+ *	    message cache element
+ */
+
+void mx_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
+{
+  mx_lockindex (stream);	/* lock index if not already locked */
+}
+
+/* MX mail ping mailbox
+ * Accepts: MAIL stream
+ * Returns: T if stream alive, else NIL
+ */
+
+long mx_ping (MAILSTREAM *stream)
+{
+  MAILSTREAM *sysibx = NIL;
+  MESSAGECACHE *elt,*selt;
+  struct stat sbuf;
+  char *s,tmp[MAILTMPLEN];
+  int fd;
+  unsigned long i,j,r,old;
+  long nmsgs = stream->nmsgs;
+  long recent = stream->recent;
+  int silent = stream->silent;
+  if (stat (stream->mailbox,&sbuf)) return NIL;
+  stream->silent = T;		/* don't pass up exists events yet */
+  if (sbuf.st_ctime != LOCAL->scantime) {
+    struct direct **names = NIL;
+    long nfiles = scandir (stream->mailbox,&names,mx_select,mx_numsort);
+    if (nfiles < 0) nfiles = 0;	/* in case error */
+    old = stream->uid_last;
+				/* note scanned now */
+    LOCAL->scantime = sbuf.st_ctime;
+				/* scan directory */
+    for (i = 0; i < nfiles; ++i) {
+				/* if newly seen, add to list */
+      if ((j = atoi (names[i]->d_name)) > old) {
+				/* swell the cache */
+	mail_exists (stream,++nmsgs);
+	stream->uid_last = (elt = mail_elt (stream,nmsgs))->private.uid = j;
+	elt->valid = T;		/* note valid flags */
+	if (old) {		/* other than the first pass? */
+	  elt->recent = T;	/* yup, mark as recent */
+	  recent++;		/* bump recent count */
+	}
+      }
+      fs_give ((void **) &names[i]);
+    }
+				/* free directory */
+    if (s = (void *) names) fs_give ((void **) &s);
+  }
+  stream->nmsgs = nmsgs;	/* don't upset mail_uid() */
+
+				/* if INBOX, snarf from system INBOX  */
+  if (mx_lockindex (stream) && stream->inbox &&
+      !strcmp (sysinbox (),stream->mailbox)) {
+    old = stream->uid_last;
+    MM_CRITICAL (stream);	/* go critical */
+				/* see if anything in system inbox */
+    if (!stat (sysinbox (),&sbuf) && sbuf.st_size &&
+	(sysibx = mail_open (sysibx,sysinbox (),OP_SILENT)) &&
+	!sysibx->rdonly && (r = sysibx->nmsgs)) {
+      for (i = 1; i <= r; ++i) {/* for each message in sysinbox mailbox */
+				/* build file name we will use */
+	sprintf (LOCAL->buf,"%s/%lu",stream->mailbox,++old);
+				/* snarf message from Berkeley mailbox */
+	selt = mail_elt (sysibx,i);
+	if (((fd = open (LOCAL->buf,O_WRONLY|O_CREAT|O_EXCL,
+			 (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL)))
+	     >= 0) &&
+	    (s = mail_fetchheader_full (sysibx,i,NIL,&j,FT_PEEK)) &&
+	    (write (fd,s,j) == j) &&
+	    (s = mail_fetchtext_full (sysibx,i,&j,FT_PEEK)) &&
+	    (write (fd,s,j) == j) && !fsync (fd) && !close (fd)) {
+				/* swell the cache */
+	  mail_exists (stream,++nmsgs);
+	  stream->uid_last =	/* create new elt, note its file number */
+	    (elt = mail_elt (stream,nmsgs))->private.uid = old;
+	  recent++;		/* bump recent count */
+				/* set up initial flags and date */
+	  elt->valid = elt->recent = T;
+	  elt->seen = selt->seen;
+	  elt->deleted = selt->deleted;
+	  elt->flagged = selt->flagged;
+	  elt->answered = selt->answered;
+	  elt->draft = selt->draft;
+	  elt->day = selt->day;elt->month = selt->month;elt->year = selt->year;
+	  elt->hours = selt->hours;elt->minutes = selt->minutes;
+	  elt->seconds = selt->seconds;
+	  elt->zhours = selt->zhours; elt->zminutes = selt->zminutes;
+	  elt->zoccident = selt->zoccident;
+	  mx_setdate (LOCAL->buf,elt);
+	  sprintf (tmp,"%lu",i);/* delete it from the sysinbox */
+	  mail_flag (sysibx,tmp,"\\Deleted",ST_SET);
+	}
+	else {			/* failed to snarf */
+	  if (fd) {		/* did it ever get opened? */
+	    close (fd);		/* close descriptor */
+	    unlink (LOCAL->buf);/* flush this file */
+	  }
+	  sprintf (tmp,"Message copy to MX mailbox failed: %.80s",
+		   s,strerror (errno));
+	  MM_LOG (tmp,ERROR);
+	  r = 0;		/* stop the snarf in its tracks */
+	}
+      }
+				/* update scan time */
+      if (!stat (stream->mailbox,&sbuf)) LOCAL->scantime = sbuf.st_ctime;      
+      mail_expunge (sysibx);	/* now expunge all those messages */
+    }
+    if (sysibx) mail_close (sysibx);
+    MM_NOCRITICAL (stream);	/* release critical */
+  }
+  mx_unlockindex (stream);	/* done with index */
+  stream->silent = silent;	/* can pass up events now */
+  mail_exists (stream,nmsgs);	/* notify upper level of mailbox size */
+  mail_recent (stream,recent);
+  return T;			/* return that we are alive */
+}
+
+/* MX mail check mailbox
+ * Accepts: MAIL stream
+ */
+
+void mx_check (MAILSTREAM *stream)
+{
+  if (mx_ping (stream)) MM_LOG ("Check completed",(long) NIL);
+}
+
+
+/* MX mail expunge mailbox
+ * Accepts: MAIL stream
+ *	    sequence to expunge if non-NIL
+ *	    expunge options
+ * Returns: T, always
+ */
+
+long mx_expunge (MAILSTREAM *stream,char *sequence,long options)
+{
+  long ret;
+  MESSAGECACHE *elt;
+  unsigned long i = 1;
+  unsigned long n = 0;
+  unsigned long recent = stream->recent;
+  if (ret = (sequence ? ((options & EX_UID) ?
+			 mail_uid_sequence (stream,sequence) :
+			 mail_sequence (stream,sequence)) : LONGT) &&
+      mx_lockindex (stream)) {	/* lock the index */
+    MM_CRITICAL (stream);	/* go critical */
+    while (i <= stream->nmsgs) {/* for each message */
+      elt = mail_elt (stream,i);/* if deleted, need to trash it */
+      if (elt->deleted && (sequence ? elt->sequence : T)) {
+	sprintf (LOCAL->buf,"%s/%lu",stream->mailbox,elt->private.uid);
+	if (unlink (LOCAL->buf)) {/* try to delete the message */
+	  sprintf (LOCAL->buf,"Expunge of message %lu failed, aborted: %s",i,
+		   strerror (errno));
+	  MM_LOG (LOCAL->buf,(long) NIL);
+	  break;
+	}
+				/* note uncached */
+	LOCAL->cachedtexts -= ((elt->private.msg.header.text.data ?
+				elt->private.msg.header.text.size : 0) +
+			       (elt->private.msg.text.text.data ?
+				elt->private.msg.text.text.size : 0));
+	mail_gc_msg (&elt->private.msg,GC_ENV | GC_TEXTS);
+	if(elt->recent)--recent;/* if recent, note one less recent message */
+	mail_expunged(stream,i);/* notify upper levels */
+	n++;			/* count up one more expunged message */
+      }
+      else i++;			/* otherwise try next message */
+    }
+    if (n) {			/* output the news if any expunged */
+      sprintf (LOCAL->buf,"Expunged %lu messages",n);
+      MM_LOG (LOCAL->buf,(long) NIL);
+    }
+    else MM_LOG ("No messages deleted, so no update needed",(long) NIL);
+    MM_NOCRITICAL (stream);	/* release critical */
+    mx_unlockindex (stream);	/* finished with index */
+				/* notify upper level of new mailbox size */
+    mail_exists (stream,stream->nmsgs);
+    mail_recent (stream,recent);
+  }
+  return ret;
+}
+
+/* MX mail copy message(s)
+ * Accepts: MAIL stream
+ *	    sequence
+ *	    destination mailbox
+ *	    copy options
+ * Returns: T if copy successful, else NIL
+ */
+
+long mx_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
+{
+  FDDATA d;
+  STRING st;
+  MESSAGECACHE *elt;
+  MAILSTREAM *astream;
+  struct stat sbuf;
+  int fd;
+  unsigned long i,j,uid,uidv;
+  char *t,tmp[MAILTMPLEN];
+  long ret;
+  mailproxycopy_t pc =
+    (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
+				/* make sure valid mailbox */
+  if (!mx_valid (mailbox)) switch (errno) {
+  case NIL:			/* no error in stat() */
+    if (pc) return (*pc) (stream,sequence,mailbox,options);
+    sprintf (LOCAL->buf,"Not a MX-format mailbox: %.80s",mailbox);
+    MM_LOG (LOCAL->buf,ERROR);
+    return NIL;
+  default:			/* some stat() error */
+    MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before copy",NIL);
+    return NIL;
+  }
+				/* copy the messages */
+  if (!(ret = ((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
+	       mail_sequence (stream,sequence))));
+				/* acquire stream to append to */
+  else if (!(astream = mail_open (NIL,mailbox,OP_SILENT))) {
+    MM_LOG ("Can't open copy mailbox",ERROR);
+    ret = NIL;
+  }
+  else {
+    MM_CRITICAL (stream);	/* go critical */
+    if (!(ret = mx_lockindex (astream)))
+      MM_LOG ("Message copy failed: unable to lock index",ERROR);
+    else {
+
+      copyuid_t cu = (copyuid_t) mail_parameters (NIL,GET_COPYUID,NIL);
+      SEARCHSET *source = cu ? mail_newsearchset () : NIL;
+      SEARCHSET *dest = cu ? mail_newsearchset () : NIL;
+      for (i = 1,uid = uidv = 0; ret && (i <= stream->nmsgs); i++) 
+      if ((elt = mail_elt (stream,i))->sequence) {
+	if (ret = ((fd = open (mx_fast_work (stream,elt),O_RDONLY,NIL))
+		   >= 0)) {
+	  fstat (fd,&sbuf);	/* get size of message */
+	  d.fd = fd;		/* set up file descriptor */
+	  d.pos = 0;		/* start of file */
+	  d.chunk = LOCAL->buf;
+	  d.chunksize = CHUNKSIZE;
+	  INIT (&st,fd_string,&d,sbuf.st_size);
+				/* init flag string */
+	  tmp[0] = tmp[1] = '\0';
+	  if (j = elt->user_flags) do
+	    if (t = stream->user_flags[find_rightmost_bit (&j)])
+	      strcat (strcat (tmp," "),t);
+	  while (j);
+	  if (elt->seen) strcat (tmp," \\Seen");
+	  if (elt->deleted) strcat (tmp," \\Deleted");
+	  if (elt->flagged) strcat (tmp," \\Flagged");
+	  if (elt->answered) strcat (tmp," \\Answered");
+	  if (elt->draft) strcat (tmp," \\Draft");
+	  tmp[0] = '(';		/* open list */
+	  strcat (tmp,")");	/* close list */
+	  if (ret = mx_append_msg (astream,tmp,elt,&st,dest)) {
+				/* add to source set if needed */
+	    if (source) mail_append_set (source,mail_uid (stream,i));
+				/* delete if doing a move */
+	    if (options & CP_MOVE) elt->deleted = T;
+	  }
+	}
+      }
+				/* return sets if doing COPYUID */
+      if (cu && ret) (*cu) (stream,mailbox,astream->uid_validity,source,dest);
+      else {			/* flush any sets we may have built */
+	mail_free_searchset (&source);
+	mail_free_searchset (&dest);
+      }
+      mx_unlockindex (astream);	/* unlock index */
+    }
+    MM_NOCRITICAL (stream);
+    mail_close (astream);	/* finished with append stream */
+  }
+  return ret;			/* return success */
+}
+
+/* MX mail append message from stringstruct
+ * Accepts: MAIL stream
+ *	    destination mailbox
+ *	    append callback
+ *	    data for callback
+ * Returns: T if append successful, else NIL
+ */
+
+long mx_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
+{
+  MESSAGECACHE elt;
+  MAILSTREAM *astream;
+  char *flags,*date,tmp[MAILTMPLEN];
+  STRING *message;
+  long ret = LONGT;
+				/* default stream to prototype */
+  if (!stream) stream = user_flags (&mxproto);
+				/* N.B.: can't use LOCAL->buf for tmp */
+				/* make sure valid mailbox */
+  if (!mx_isvalid (mailbox,tmp)) switch (errno) {
+  case ENOENT:			/* no such file? */
+    if (!compare_cstring (mailbox,"INBOX")) mx_create (NIL,"INBOX");
+    else {
+      MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before append",NIL);
+      return NIL;
+    }
+				/* falls through */
+  case 0:			/* merely empty file? */
+    break;
+  case EINVAL:
+    sprintf (tmp,"Invalid MX-format mailbox name: %.80s",mailbox);
+    MM_LOG (tmp,ERROR);
+    return NIL;
+  default:
+    sprintf (tmp,"Not a MX-format mailbox: %.80s",mailbox);
+    MM_LOG (tmp,ERROR);
+    return NIL;
+  }
+
+				/* get first message */
+  if (!MM_APPEND (af) (stream,data,&flags,&date,&message)) return NIL;
+  if (!(astream = mail_open (NIL,mailbox,OP_SILENT))) {
+    MM_LOG ("Can't open append mailbox",ERROR);
+    return NIL;
+  }
+  MM_CRITICAL (astream);	/* go critical */
+				/* lock the index */
+  if (!(ret = mx_lockindex (astream)))
+    MM_LOG ("Message append failed: unable to lock index",ERROR);
+  else {
+    appenduid_t au = (appenduid_t) mail_parameters (NIL,GET_APPENDUID,NIL);
+    SEARCHSET *dst = au ? mail_newsearchset () : NIL;
+    do {
+				/* guard against zero-length */
+      if (!(ret = SIZE (message)))
+	MM_LOG ("Append of zero-length message",ERROR);
+      else if (date && !(ret = mail_parse_date (&elt,date))) {
+	sprintf (tmp,"Bad date in append: %.80s",date);
+	MM_LOG (tmp,ERROR);
+      }
+      else ret = mx_append_msg (astream,flags,date ? &elt : NIL,message,dst)&&
+	     MM_APPEND (af) (stream,data,&flags,&date,&message);
+    } while (ret && message);
+				/* return sets if doing APPENDUID */
+    if (au && ret) (*au) (mailbox,astream->uid_validity,dst);
+    else mail_free_searchset (&dst);
+    mx_unlockindex (astream);	/* unlock index */
+  }
+  MM_NOCRITICAL (astream);	/* release critical */
+  mail_close (astream);
+  return ret;
+}
+
+/* MX mail append single message
+ * Accepts: MAIL stream
+ *	    flags for new message if non-NIL
+ *	    elt with source date if non-NIL
+ *	    stringstruct of message text
+ *	    searchset to place UID
+ * Returns: T if success, NIL if failure
+ */
+
+long mx_append_msg (MAILSTREAM *stream,char *flags,MESSAGECACHE *elt,
+		    STRING *st,SEARCHSET *set)
+{
+  char tmp[MAILTMPLEN];
+  int fd;
+  unsigned long uf;
+  long f = mail_parse_flags (stream,flags,&uf);
+				/* make message file name */
+  sprintf (tmp,"%s/%lu",stream->mailbox,++stream->uid_last);
+  if ((fd = open (tmp,O_WRONLY|O_CREAT|O_EXCL,
+		  (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL))) < 0) {
+    sprintf (tmp,"Can't create append message: %s",strerror (errno));
+    MM_LOG (tmp,ERROR);
+    return NIL;
+  }
+  while (SIZE (st)) {		/* copy the file */
+    if (st->cursize && (write (fd,st->curpos,st->cursize) < 0)) {
+      unlink (tmp);		/* delete file */
+      close (fd);		/* close the file */
+      sprintf (tmp,"Message append failed: %s",strerror (errno));
+      MM_LOG (tmp,ERROR);
+      return NIL;
+    }
+    SETPOS (st,GETPOS (st) + st->cursize);
+  }
+  close (fd);			/* close the file */
+  if (elt) mx_setdate (tmp,elt);/* set file date */
+				/* swell the cache */
+  mail_exists (stream,++stream->nmsgs);
+				/* copy flags */
+  mail_append_set (set,(elt = mail_elt (stream,stream->nmsgs))->private.uid =
+		   stream->uid_last);
+  if (f&fSEEN) elt->seen = T;
+  if (f&fDELETED) elt->deleted = T;
+  if (f&fFLAGGED) elt->flagged = T;
+  if (f&fANSWERED) elt->answered = T;
+  if (f&fDRAFT) elt->draft = T;
+  elt->user_flags |= uf;
+  return LONGT;
+}
+
+/* Internal routines */
+
+
+/* MX file name selection test
+ * Accepts: candidate directory entry
+ * Returns: T to use file name, NIL to skip it
+ */
+
+int mx_select (struct direct *name)
+{
+  char c;
+  char *s = name->d_name;
+  while (c = *s++) if (!isdigit (c)) return NIL;
+  return T;
+}
+
+
+/* MX file name comparision
+ * Accepts: first candidate directory entry
+ *	    second candidate directory entry
+ * Returns: negative if d1 < d2, 0 if d1 == d2, postive if d1 > d2
+ */
+
+int mx_numsort (const void *d1,const void *d2)
+{
+  return atoi ((*(struct direct **) d1)->d_name) -
+    atoi ((*(struct direct **) d2)->d_name);
+}
+
+
+/* MX mail build file name
+ * Accepts: destination string
+ *          source
+ * Returns: destination
+ */
+
+char *mx_file (char *dst,char *name)
+{
+  char *s;
+				/* empty string if mailboxfile fails */
+  if (!mailboxfile (dst,name)) *dst = '\0';
+				/* driver-selected INBOX  */
+  else if (!*dst) mailboxfile (dst,"~/INBOX");
+				/* tie off unnecessary trailing / */
+  else if ((s = strrchr (dst,'/')) && !s[1]) *s = '\0';
+  return dst;
+}
+
+/* MX read and lock index
+ * Accepts: MAIL stream
+ * Returns: T if success, NIL if failure
+ */
+
+long mx_lockindex (MAILSTREAM *stream)
+{
+  unsigned long uf,sf,uid;
+  int k = 0;
+  unsigned long msgno = 1;
+  struct stat sbuf;
+  char *s,*t,*idx,tmp[2*MAILTMPLEN];
+  MESSAGECACHE *elt;
+  blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
+  if ((LOCAL->fd < 0) &&	/* get index file, no-op if already have it */
+      (LOCAL->fd = open (strcat (strcpy (tmp,stream->mailbox),MXINDEXNAME),
+			 O_RDWR|O_CREAT,
+			 (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL)))
+      >= 0) {
+    (*bn) (BLOCK_FILELOCK,NIL);
+    flock (LOCAL->fd,LOCK_EX);	/* get exclusive lock */
+    (*bn) (BLOCK_NONE,NIL);
+    fstat (LOCAL->fd,&sbuf);	/* get size of index */
+				/* slurp index */
+    read (LOCAL->fd,s = idx = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
+    idx[sbuf.st_size] = '\0';	/* tie off index */
+				/* parse index */
+    if (sbuf.st_size) while (s && *s) switch (*s) {
+    case 'V':			/* UID validity record */
+      stream->uid_validity = strtoul (s+1,&s,16);
+      break;
+    case 'L':			/* UID last record */
+      stream->uid_last = strtoul (s+1,&s,16);
+      break;
+    case 'K':			/* keyword */
+				/* find end of keyword */
+      if (s = strchr (t = ++s,'\n')) {
+	*s++ = '\0';		/* tie off keyword */
+				/* copy keyword */
+	if ((k < NUSERFLAGS) && !stream->user_flags[k] &&
+	    (strlen (t) <= MAXUSERFLAG)) stream->user_flags[k] = cpystr (t);
+	k++;			/* one more keyword */
+      }
+      break;
+
+    case 'M':			/* message status record */
+      uid = strtoul (s+1,&s,16);/* get UID for this message */
+      if (*s == ';') {		/* get user flags */
+	uf = strtoul (s+1,&s,16);
+	if (*s == '.') {	/* get system flags */
+	  sf = strtoul (s+1,&s,16);
+	  while ((msgno <= stream->nmsgs) && (mail_uid (stream,msgno) < uid))
+	    msgno++;		/* find message number for this UID */
+	  if ((msgno <= stream->nmsgs) && (mail_uid (stream,msgno) == uid)) {
+	    (elt = mail_elt (stream,msgno))->valid = T;
+	    elt->user_flags=uf; /* set user and system flags in elt */
+	    if (sf & fSEEN) elt->seen = T;
+	    if (sf & fDELETED) elt->deleted = T;
+	    if (sf & fFLAGGED) elt->flagged = T;
+	    if (sf & fANSWERED) elt->answered = T;
+	    if (sf & fDRAFT) elt->draft = T;
+	  }
+	  break;
+	}
+      }
+    default:			/* bad news */
+      sprintf (tmp,"Error in index: %.80s",s);
+      MM_LOG (tmp,ERROR);
+      *s = NIL;			/* ignore remainder of index */
+    }
+    else {			/* new index */
+      stream->uid_validity = time (0);
+      user_flags (stream);	/* init stream with default user flags */
+    }
+    fs_give ((void **) &idx);	/* flush index */
+  }
+  return (LOCAL->fd >= 0) ? T : NIL;
+}
+
+/* MX write and unlock index
+ * Accepts: MAIL stream
+ */
+
+#define MXIXBUFLEN 2048
+
+void mx_unlockindex (MAILSTREAM *stream)
+{
+  unsigned long i,j;
+  off_t size = 0;
+  char *s,tmp[MXIXBUFLEN + 64];
+  MESSAGECACHE *elt;
+  if (LOCAL->fd >= 0) {
+    lseek (LOCAL->fd,0,L_SET);	/* rewind file */
+				/* write header */
+    sprintf (s = tmp,"V%08lxL%08lx",stream->uid_validity,stream->uid_last);
+    for (i = 0; (i < NUSERFLAGS) && stream->user_flags[i]; ++i)
+      sprintf (s += strlen (s),"K%s\n",stream->user_flags[i]);
+				/* write messages */
+    for (i = 1; i <= stream->nmsgs; i++) {
+				/* filled buffer? */
+      if (((s += strlen (s)) - tmp) > MXIXBUFLEN) {
+	write (LOCAL->fd,tmp,j = s - tmp);
+	size += j;
+	*(s = tmp) = '\0';	/* dump out and restart buffer */
+      }
+      elt = mail_elt (stream,i);
+      sprintf(s,"M%08lx;%08lx.%04x",elt->private.uid,elt->user_flags,(unsigned)
+	      ((fSEEN * elt->seen) + (fDELETED * elt->deleted) +
+	       (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
+	       (fDRAFT * elt->draft)));
+    }
+				/* write tail end of buffer */
+    if ((s += strlen (s)) != tmp) {
+      write (LOCAL->fd,tmp,j = s - tmp);
+      size += j;
+    }
+    ftruncate (LOCAL->fd,size);
+    flock (LOCAL->fd,LOCK_UN);	/* unlock the index */
+    close (LOCAL->fd);		/* finished with file */
+    LOCAL->fd = -1;		/* no index now */
+  }
+}
+
+/* Set date for message
+ * Accepts: file name
+ *	    elt containing date
+ */
+
+void mx_setdate (char *file,MESSAGECACHE *elt)
+{
+  time_t tp[2];
+  tp[0] = time (0);		/* atime is now */
+  tp[1] = mail_longdate (elt);	/* modification time */
+  utime (file,tp);		/* set the times */
+}