--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/osdep/dos/dummydos.c	Mon Sep 14 15:17:45 2009 +0900
@@ -0,0 +1,689 @@
+/* ========================================================================
+ * 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:	Dummy routines for DOS
+ *
+ * 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 May 1993
+ * Last Edited:	30 August 2006
+ */
+
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include "mail.h"
+#include "osdep.h"
+#include <sys\stat.h>
+#include <dos.h>
+#include "dummy.h"
+#include "misc.h"
+
+/* Function prototypes */
+
+DRIVER *dummy_valid (char *name);
+void *dummy_parameters (long function,void *value);
+void dummy_list_work (MAILSTREAM *stream,char *dir,char *pat,char *contents,
+		      long level);
+long dummy_listed (MAILSTREAM *stream,char delimiter,char *name,
+		   long attributes,char *contents);
+long dummy_subscribe (MAILSTREAM *stream,char *mailbox);
+MAILSTREAM *dummy_open (MAILSTREAM *stream);
+void dummy_close (MAILSTREAM *stream,long options);
+long dummy_ping (MAILSTREAM *stream);
+void dummy_check (MAILSTREAM *stream);
+long dummy_expunge (MAILSTREAM *stream,char *sequence,long options);
+long dummy_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
+long dummy_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
+long dummy_badname (char *tmp,char *s);
+
+/* Dummy routines */
+
+
+/* Driver dispatch used by MAIL */
+
+DRIVER dummydriver = {
+  "dummy",			/* driver name */
+  DR_LOCAL|DR_MAIL,		/* driver flags */
+  (DRIVER *) NIL,		/* next driver */
+  dummy_valid,			/* mailbox is valid for us */
+  dummy_parameters,		/* manipulate parameters */
+  dummy_scan,			/* scan mailboxes */
+  dummy_list,			/* list mailboxes */
+  dummy_lsub,			/* list subscribed mailboxes */
+  dummy_subscribe,		/* subscribe to mailbox */
+  NIL,				/* unsubscribe from mailbox */
+  dummy_create,			/* create mailbox */
+  dummy_delete,			/* delete mailbox */
+  dummy_rename,			/* rename mailbox */
+  mail_status_default,		/* status of mailbox */
+  dummy_open,			/* open mailbox */
+  dummy_close,			/* close mailbox */
+  NIL,				/* fetch message "fast" attributes */
+  NIL,				/* fetch message flags */
+  NIL,				/* fetch overview */
+  NIL,				/* fetch message structure */
+  NIL,				/* fetch header */
+  NIL,				/* fetch text */
+  NIL,				/* fetch message data */
+  NIL,				/* unique identifier */
+  NIL,				/* message number from UID */
+  NIL,				/* modify flags */
+  NIL,				/* per-message modify flags */
+  NIL,				/* search for message based on criteria */
+  NIL,				/* sort messages */
+  NIL,				/* thread messages */
+  dummy_ping,			/* ping mailbox to see if still alive */
+  dummy_check,			/* check for new messages */
+  dummy_expunge,		/* expunge deleted messages */
+  dummy_copy,			/* copy messages to another mailbox */
+  dummy_append,			/* append string message to mailbox */
+  NIL				/* garbage collect stream */
+};
+
+
+				/* prototype stream */
+MAILSTREAM dummyproto = {&dummydriver};
+
+				/* driver parameters */
+static char *file_extension = NIL;
+
+/* Dummy validate mailbox
+ * Accepts: mailbox name
+ * Returns: our driver if name is valid, NIL otherwise
+ */
+
+DRIVER *dummy_valid (char *name)
+{
+  char *s,tmp[MAILTMPLEN];
+  struct stat sbuf;
+				/* must be valid local mailbox */
+  return (name && *name && (*name != '{') &&
+	  (s = mailboxfile (tmp,name)) && (!*s || !stat (s,&sbuf))) ?
+	    &dummydriver : NIL;
+}
+
+
+/* Dummy manipulate driver parameters
+ * Accepts: function code
+ *	    function-dependent value
+ * Returns: function-dependent return value
+ */
+
+void *dummy_parameters (long function,void *value)
+{
+  void *ret = NIL;
+  switch ((int) function) {
+  case SET_EXTENSION:
+    if (file_extension) fs_give ((void **) &file_extension);
+    if (*(char *) value) file_extension = cpystr ((char *) value);
+  case GET_EXTENSION:
+    ret = (void *) file_extension;
+  }
+  return ret;
+}
+
+/* Dummy scan mailboxes
+ * Accepts: mail stream
+ *	    reference
+ *	    pattern to search
+ *	    string to scan
+ */
+
+#define LISTTMPLEN 128
+
+void dummy_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
+{
+  char *s,test[LISTTMPLEN],file[LISTTMPLEN];
+  long i = 0;
+  if (!pat || !*pat) {		/* empty pattern? */
+    if (dummy_canonicalize (test,ref,"*")) {
+				/* tie off name at root */
+      if (s = strchr (test,'\\')) *++s = '\0';
+      else test[0] = '\0';
+      dummy_listed (stream,'\\',test,LATT_NOINFERIORS,NIL);
+    }
+  }
+				/* get canonical form of name */
+  else if (dummy_canonicalize (test,ref,pat)) {
+				/* found any wildcards? */
+    if (s = strpbrk (test,"%*")) {
+				/* yes, copy name up to that point */
+      strncpy (file,test,(size_t) (i = s - test));
+      file[i] = '\0';		/* tie off */
+    }
+    else strcpy (file,test);	/* use just that name then */
+				/* find directory name */
+    if (s = strrchr (file,'\\')) {
+      *++s = '\0';		/* found, tie off at that point */
+      s = file;
+    }
+				/* silly case */
+    else if (file[0] == '#') s = file;
+				/* do the work */
+    dummy_list_work (stream,s,test,contents,0);
+    if (pmatch ("INBOX",test))	/* always an INBOX */
+      dummy_listed (stream,NIL,"INBOX",LATT_NOINFERIORS,contents);
+  }
+}
+
+/* Dummy list mailboxes
+ * Accepts: mail stream
+ *	    reference
+ *	    pattern to search
+ */
+
+void dummy_list (MAILSTREAM *stream,char *ref,char *pat)
+{
+  dummy_scan (stream,ref,pat,NIL);
+}
+
+
+/* Dummy list subscribed mailboxes
+ * Accepts: mail stream
+ *	    pattern to search
+ */
+
+void dummy_lsub (MAILSTREAM *stream,char *ref,char *pat)
+{
+  void *sdb = NIL;
+  char *s,*t,test[MAILTMPLEN];
+  int showuppers = pat[strlen (pat) - 1] == '%';
+				/* get canonical form of name */
+  if (dummy_canonicalize (test,ref,pat) && (s = sm_read (&sdb))) do
+    if (*s != '{') {
+      if (pmatch_full (s,test,'\\')) {
+	if (pmatch (s,"INBOX")) mm_lsub (stream,NIL,s,LATT_NOINFERIORS);
+	else mm_lsub (stream,'\\',s,NIL);
+      }
+      else while (showuppers && (t = strrchr (s,'\\'))) {
+	*t = '\0';		/* tie off the name */
+	if (pmatch_full (s,test,'\\')) mm_lsub (stream,'\\',s,LATT_NOSELECT);
+      }
+    }
+  while (s = sm_read (&sdb));	/* until no more subscriptions */
+}
+
+
+/* Dummy subscribe to mailbox
+ * Accepts: mail stream
+ *	    mailbox to add to subscription list
+ * Returns: T on success, NIL on failure
+ */
+
+long dummy_subscribe (MAILSTREAM *stream,char *mailbox)
+{
+  char *s,tmp[MAILTMPLEN];
+  struct stat sbuf;
+				/* must be valid local mailbox */
+  if ((s = mailboxfile (tmp,mailbox)) && *s && !stat (s,&sbuf) &&
+      ((sbuf.st_mode & S_IFMT) == S_IFREG)) return sm_subscribe (mailbox);
+  sprintf (tmp,"Can't subscribe %s: not a mailbox",mailbox);
+  mm_log (tmp,ERROR);
+  return NIL;
+}
+
+/* Dummy list mailboxes worker routine
+ * Accepts: mail stream
+ *	    directory name to search
+ *	    search pattern
+ *	    string to scan
+ *	    search level
+ */
+
+void dummy_list_work (MAILSTREAM *stream,char *dir,char *pat,char *contents,
+		      long level)
+{
+  struct find_t f;
+  struct stat sbuf;
+  char *s,tmp[LISTTMPLEN],tmpx[LISTTMPLEN];
+  char *base = (dir && (dir[0] == '\\')) ? NIL : myhomedir ();
+				/* build name */
+  if (base) sprintf (tmpx,"%s\\",base);
+  else tmpx[0] = '\0';
+  if (dir) strcat (tmpx,dir);
+				/* punt if bogus name */
+  if (!mailboxfile (tmp,tmpx)) return;
+				/* make directory wildcard */
+  strcat (tmp,(tmp[strlen (tmp) -1] == '\\') ? "*." : "\\*.");
+  strcat (tmp,file_extension ? file_extension : "*");
+				/* do nothing if can't open directory */
+  if (!_dos_findfirst (tmp,_A_NORMAL|_A_SUBDIR,&f)) {
+				/* list it if at top-level */
+    if (!level && dir && pmatch_full (dir,pat,'\\'))
+      dummy_listed (stream,'\\',dir,LATT_NOSELECT,contents);
+				/* scan directory */
+    if (tmpx[strlen (tmpx) - 1] == '\\') do if (*f.name != '.') {
+      if (base) sprintf (tmpx,"%s\\",base);
+      else tmpx[0] = '\0';
+      if (dir) sprintf (tmpx + strlen (tmpx),"%s%s",dir,f.name);
+      else strcat (tmpx,f.name);
+      if (mailboxfile (tmp,tmpx) && !stat (tmp,&sbuf)) {
+				/* suppress extension */
+	if (file_extension && (s = strchr (f.name,'.'))) *s = '\0';
+				/* now make name we'd return */
+	if (dir) sprintf (tmp,"%s%s",dir,f.name);
+	else strcpy (tmp,f.name);
+				/* only interested in file type */
+	switch (sbuf.st_mode & S_IFMT) {
+	case S_IFDIR:		/* directory? */
+	  if (pmatch_full (tmp,pat,'\\')) {
+	    dummy_listed (stream,'\\',tmp,LATT_NOSELECT,contents);
+	    strcat (tmp,"\\");	/* set up for dmatch call */
+	  }
+				/* try again with trailing / */
+	  else if (pmatch_full (strcat (tmp,"\\"),pat,'\\'))
+	    dummy_listed (stream,'\\',tmp,LATT_NOSELECT,contents);
+	  if (dmatch (tmp,pat,'\\') &&
+	      (level < (long) mail_parameters (NIL,GET_LISTMAXLEVEL,NIL)))
+	    dummy_list_work (stream,tmp,pat,contents,level+1);
+	  break;
+	case S_IFREG:		/* ordinary name */
+	  if (pmatch_full (tmp,pat,'\\') && !pmatch ("INBOX",tmp))
+	    dummy_listed (stream,'\\',tmp,LATT_NOINFERIORS,contents);
+	  break;
+	}
+      }
+    }
+    while (!_dos_findnext (&f));
+  }
+}
+
+/* Mailbox found
+ * Accepts: hierarchy delimiter
+ *	    mailbox name
+ *	    attributes
+ *	    contents to search before calling mm_list()
+ * Returns: T, always
+ */
+
+#define BUFSIZE MAILTMPLEN
+
+long dummy_listed (MAILSTREAM *stream,char delimiter,char *name,
+		   long attributes,char *contents)
+{
+  struct stat sbuf;
+  int fd;
+  size_t csiz,ssiz,bsiz;
+  char *buf,tmp[MAILTMPLEN];
+  if (contents) {		/* want to search contents? */
+				/* forget it if can't select or open */
+    if ((attributes & LATT_NOSELECT) || !(csiz = strlen (contents)) ||
+	!mailboxfile (tmp,name) || stat (tmp,&sbuf) || (csiz > sbuf.st_size) ||
+	((fd = open (tmp,O_RDONLY,NIL)) < 0)) return T;
+				/* get buffer including slop */    
+    buf = (char *) fs_get (BUFSIZE + (ssiz = 4 * ((csiz / 4) + 1)) + 1);
+    memset (buf,'\0',ssiz);	/* no slop area the first time */
+    while (sbuf.st_size) {	/* until end of file */
+      read (fd,buf+ssiz,bsiz = min (sbuf.st_size,BUFSIZE));
+      if (search ((unsigned char *) buf,bsiz+ssiz,
+		  (unsigned char *) contents,csiz)) break;
+      memcpy (buf,buf+BUFSIZE,ssiz);
+      sbuf.st_size -= bsiz;	/* note that we read that much */
+    }
+    fs_give ((void **) &buf);	/* flush buffer */
+    close (fd);			/* finished with file */
+    if (!sbuf.st_size) return T;/* not found */
+  }
+				/* notify main program */
+  mm_list (stream,delimiter,name,attributes);
+  return T;
+}
+
+/* Dummy create mailbox
+ * Accepts: mail stream
+ *	    mailbox name to create
+ * Returns: T on success, NIL on failure
+ */
+
+long dummy_create (MAILSTREAM *stream,char *mailbox)
+{
+  char tmp[MAILTMPLEN];
+  return (compare_cstring (mailbox,"INBOX") && mailboxfile (tmp,mailbox)) ?
+    dummy_create_path (stream,tmp,NIL) : dummy_badname (tmp,mailbox);
+}
+
+
+/* Dummy create path
+ * Accepts: mail stream
+ *	    path name to create
+ *	    directory mode
+ * Returns: T on success, NIL on failure
+ */
+
+long dummy_create_path (MAILSTREAM *stream,char *path,long dirmode)
+{
+  struct stat sbuf;
+  char c,*s,tmp[MAILTMPLEN];
+  int fd;
+  long ret = NIL;
+  char *t = strrchr (path,'\\');
+  char *pt = (path[1] == ':') ? path + 2 : path;
+  int wantdir = t && !t[1];
+  if (wantdir) *t = '\0';	/* flush trailing delimiter for directory */
+				/* found superior to this name? */
+  if ((s = strrchr (pt,'\\')) && (s != pt)) {
+    strncpy (tmp,path,(size_t) (s - path));
+    tmp[s - path] = '\0';	/* make directory name for stat */
+    c = *++s;			/* tie off in case need to recurse */
+    *s = '\0';
+				/* name doesn't exist, create it */
+    if ((stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) &&
+	!dummy_create_path (stream,path,dirmode)) return NIL;
+    *s = c;			/* restore full name */
+  }
+  if (wantdir) {		/* want to create directory? */
+    ret = !mkdir (path);
+    *t = '\\';			/* restore directory delimiter */
+  }
+				/* create file */
+  else if ((fd = open (path,O_WRONLY|O_CREAT|O_EXCL,S_IREAD|S_IWRITE)) >= 0)
+    ret = !close (fd);		/* close file */
+  if (!ret) {			/* error? */
+    sprintf (tmp,"Can't create mailbox node %s: %s",path,strerror (errno));
+    mm_log (tmp,ERROR);
+  }
+  return ret;			/* return status */
+}
+
+/* Dummy delete mailbox
+ * Accepts: mail stream
+ *	    mailbox name to delete
+ * Returns: T on success, NIL on failure
+ */
+
+long dummy_delete (MAILSTREAM *stream,char *mailbox)
+{
+  struct stat sbuf;
+  char *s,tmp[MAILTMPLEN];
+  if (!mailboxfile (tmp,mailbox)) return dummy_badname (tmp,mailbox);
+				/* no trailing \ */
+  if ((s = strrchr (tmp,'\\')) && !s[1]) *s = '\0';
+  if (stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) == S_IFDIR) ?
+      rmdir (tmp) : unlink (tmp)) {
+    sprintf (tmp,"Can't delete mailbox %s: %s",mailbox,strerror (errno));
+    mm_log (tmp,ERROR);
+    return NIL;
+  }
+  return T;			/* return success */
+}
+
+
+/* Mail rename mailbox
+ * Accepts: mail stream
+ *	    old mailbox name
+ *	    new mailbox name
+ * Returns: T on success, NIL on failure
+ */
+
+long dummy_rename (MAILSTREAM *stream,char *old,char *newname)
+{
+  struct stat sbuf;
+  char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN];
+				/* make file name */
+  if (!mailboxfile (file,old)) return dummy_badname (tmp,old);
+				/* no trailing \ allowed */
+  if (!(s = mailboxfile (tmp,newname)) || ((s = strrchr (s,'\\')) && !s[1]))
+    return dummy_badname (tmp,newname);
+  if (s) {			/* found superior to destination name? */
+    c = *++s;			/* remember first character of inferior */
+    *s = '\0';			/* tie off to get just superior */
+				/* name doesn't exist, create it */
+    if ((stat (file,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) &&
+	!dummy_create (stream,file)) return NIL;
+    *s = c;			/* restore full name */
+  }
+  if (rename (file,tmp)) {
+    sprintf (tmp,"Can't rename mailbox %s to %s: %s",old,newname,
+	     strerror (errno));
+    mm_log (tmp,ERROR);
+    return NIL;
+  }
+  return LONGT;			/* return success */
+}
+
+/* Dummy open
+ * Accepts: stream to open
+ * Returns: stream on success, NIL on failure
+ */
+
+MAILSTREAM *dummy_open (MAILSTREAM *stream)
+{
+  char tmp[MAILTMPLEN];
+  struct stat sbuf;
+  int fd = -1;
+				/* OP_PROTOTYPE call or silence */
+  if (!stream || stream->silent) return NIL;
+  if (!mailboxfile (tmp,stream->mailbox))
+    sprintf (tmp,"Can't open this name: %.80s",stream->mailbox);
+  else if (compare_cstring (stream->mailbox,"INBOX") &&
+      ((fd = open (tmp,O_RDONLY,NIL)) < 0))
+    sprintf (tmp,"%s: %s",strerror (errno),stream->mailbox);
+  else {
+    if (fd >= 0) {		/* if got a file */
+      fstat (fd,&sbuf);		/* sniff at its size */
+      close (fd);
+      if (sbuf.st_size) sprintf (tmp,"Not a mailbox: %s",stream->mailbox);
+      else fd = -1;		/* a-OK */
+    }
+    if (fd < 0) {		/* no file, right? */
+      if (!stream->silent) {	/* only if silence not requested */
+				/* say there are 0 messages */
+	mail_exists (stream,(long) 0);
+	mail_recent (stream,(long) 0);
+	stream->uid_validity = time (0);
+      }
+      stream->inbox = T;	/* note that it's an INBOX */
+      return stream;		/* return success */
+    }
+  }
+  mm_log (tmp,stream->silent ? WARN: ERROR);
+  return NIL;			/* always fails */
+}
+
+
+/* Dummy close
+ * Accepts: MAIL stream
+ *	    options
+ */
+
+void dummy_close (MAILSTREAM *stream,long options)
+{
+				/* return silently */
+}
+
+/* Dummy ping mailbox
+ * Accepts: MAIL stream
+ * Returns: T if stream alive, else NIL
+ * No-op for readonly files, since read/writer can expunge it from under us!
+ */
+
+long dummy_ping (MAILSTREAM *stream)
+{
+  MAILSTREAM *test;
+				/* time to do another test? */
+  if (time (0) >= ((time_t) (stream->gensym + 30))) {
+				/* has mailbox format changed? */
+    if ((test = mail_open (NIL,stream->mailbox,OP_PROTOTYPE)) &&
+	(test->dtb != stream->dtb) &&
+	(test = mail_open (NIL,stream->mailbox,NIL))) {
+				/* preserve some resources */
+      test->original_mailbox = stream->original_mailbox;
+      stream->original_mailbox = NIL;
+      test->sparep = stream->sparep;
+      stream->sparep = NIL;
+      test->sequence = stream->sequence;
+      mail_close ((MAILSTREAM *) /* flush resources used by dummy stream */
+		  memcpy (fs_get (sizeof (MAILSTREAM)),stream,
+			  sizeof (MAILSTREAM)));
+				/* swap the streams */
+      memcpy (stream,test,sizeof (MAILSTREAM));
+      fs_give ((void **) &test);/* flush test now that copied */
+				/* make sure application knows */
+      mail_exists (stream,stream->recent = stream->nmsgs);
+    }
+				/* still hasn't changed */
+    else stream->gensym = time (0);
+  }
+  return T;
+}
+
+
+/* Dummy check mailbox
+ * Accepts: MAIL stream
+ * No-op for readonly files, since read/writer can expunge it from under us!
+ */
+
+void dummy_check (MAILSTREAM *stream)
+{
+  dummy_ping (stream);		/* invoke ping */
+}
+
+
+/* Dummy expunge mailbox
+ * Accepts: MAIL stream
+ *	    sequence to expunge if non-NIL
+ *	    expunge options
+ * Returns: T, always
+ */
+
+long dummy_expunge (MAILSTREAM *stream,char *sequence,long options)
+{
+  return LONGT;
+}
+
+/* Dummy copy message(s)
+ * Accepts: MAIL stream
+ *	    sequence
+ *	    destination mailbox
+ *	    options
+ * Returns: T if copy successful, else NIL
+ */
+
+long dummy_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
+{
+  if ((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
+      mail_sequence (stream,sequence)) fatal ("Impossible dummy_copy");
+  return NIL;
+}
+
+
+/* Dummy append message string
+ * Accepts: mail stream
+ *	    destination mailbox
+ *	    append callback function
+ *	    data for callback
+ * Returns: T on success, NIL on failure
+ */
+
+long dummy_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
+{
+  struct stat sbuf;
+  int fd = -1;
+  int e;
+  char tmp[MAILTMPLEN];
+  MAILSTREAM *ts = default_proto (T);
+  if (compare_cstring (mailbox,"INBOX") && mailboxfile (tmp,mailbox) &&
+      ((fd = open (tmp,O_RDONLY,NIL)) < 0)) {
+    if ((e = errno) == ENOENT)	/* failed, was it no such file? */
+      mm_notify (stream,"[TRYCREATE] Must create mailbox before append",
+		 (long) NIL);
+    sprintf (tmp,"%s: %s",strerror (e),mailbox);
+    mm_log (tmp,ERROR);		/* pass up error */
+    return NIL;			/* always fails */
+  }
+  if (fd >= 0) {		/* found file? */
+    fstat (fd,&sbuf);		/* get its size */
+    close (fd);			/* toss out the fd */
+    if (sbuf.st_size) ts = NIL;	/* non-empty file? */
+  }
+  if (ts) return (*ts->dtb->append) (stream,mailbox,af,data);
+  sprintf (tmp,"Indeterminate mailbox format: %s",mailbox);
+  mm_log (tmp,ERROR);
+  return NIL;
+}
+
+/* Return bad file name error message
+ * Accepts: temporary buffer
+ *	    file name
+ * Returns: long NIL always
+ */
+
+long dummy_badname (char *tmp,char *s)
+{
+  sprintf (tmp,"Invalid mailbox name: %s",s);
+  mm_log (tmp,ERROR);
+  return (long) NIL;
+}
+
+
+/* Dummy canonicalize name
+ * Accepts: buffer to write name
+ *	    reference
+ *	    pattern
+ * Returns: T if success, NIL if failure
+ */
+
+long dummy_canonicalize (char *tmp,char *ref,char *pat)
+{
+  unsigned long i;
+  char *s,dev[4];
+				/* initially no device */
+  dev[0] = dev[1] = dev[2] = dev[3] = '\0';
+  if (ref) switch (*ref) {	/* preliminary reference check */
+  case '{':			/* remote names not allowed */
+    return NIL;			/* disallowed */
+  case '\0':			/* empty reference string */
+    break;
+  default:			/* all other names */
+    if (ref[1] == ':') {	/* start with device name? */
+      dev[0] = *ref++; dev[1] = *ref++;
+    }
+    break;
+  }
+  if (pat[1] == ':') {		/* device name in pattern? */
+    dev[0] = *pat++; dev[1] = *pat++;
+    ref = NIL;			/* ignore reference */
+  }
+  switch (*pat) {
+  case '#':			/* namespace names */
+    if (mailboxfile (tmp,pat)) strcpy (tmp,pat);
+    else return NIL;		/* unknown namespace */
+    break;
+  case '{':			/* remote names not allowed */
+    return NIL;
+  case '\\':			/* rooted name */
+    ref = NIL;			/* ignore reference */
+    break;
+  }
+				/* make sure device names are rooted */
+  if (dev[0] && (*(ref ? ref : pat) != '\\')) dev[2] = '\\';
+				/* build name */
+  sprintf (tmp,"%s%s%s",dev,ref ? ref : "",pat);
+  ucase (tmp);			/* force upper case */
+				/* count wildcards */
+  for (i = 0, s = tmp; *s; *s++) if ((*s == '*') || (*s == '%')) ++i;
+  if (i > MAXWILDCARDS) {	/* ridiculous wildcarding? */
+    MM_LOG ("Excessive wildcards in LIST/LSUB",ERROR);
+    return NIL;
+  }
+  return T;
+}