1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/osdep/nt/tenexnt.c	Mon Sep 14 15:17:45 2009 +0900
     1.3 @@ -0,0 +1,1310 @@
     1.4 +/* ========================================================================
     1.5 + * Copyright 1988-2007 University of Washington
     1.6 + *
     1.7 + * Licensed under the Apache License, Version 2.0 (the "License");
     1.8 + * you may not use this file except in compliance with the License.
     1.9 + * You may obtain a copy of the License at
    1.10 + *
    1.11 + *     http://www.apache.org/licenses/LICENSE-2.0
    1.12 + *
    1.13 + * 
    1.14 + * ========================================================================
    1.15 + */
    1.16 +
    1.17 +/*
    1.18 + * Program:	Tenex mail routines
    1.19 + *
    1.20 + * Author:	Mark Crispin
    1.21 + *		Networks and Distributed Computing
    1.22 + *		Computing & Communications
    1.23 + *		University of Washington
    1.24 + *		Administration Building, AG-44
    1.25 + *		Seattle, WA  98195
    1.26 + *		Internet: MRC@CAC.Washington.EDU
    1.27 + *
    1.28 + * Date:	22 May 1990
    1.29 + * Last Edited:	18 June 2007
    1.30 + */
    1.31 +
    1.32 +
    1.33 +/*				FILE TIME SEMANTICS
    1.34 + *
    1.35 + * The atime is the last read time of the file.
    1.36 + * The mtime is the last flags update time of the file.
    1.37 + * The ctime is the last write time of the file.
    1.38 + *
    1.39 + *				TEXT SIZE SEMANTICS
    1.40 + *
    1.41 + * Most of the text sizes are in internal (LF-only) form, except for the
    1.42 + * msg.text size.  Beware.
    1.43 + */
    1.44 +
    1.45 +#include <stdio.h>
    1.46 +#include <ctype.h>
    1.47 +#include <errno.h>
    1.48 +extern int errno;		/* just in case */
    1.49 +#include "mail.h"
    1.50 +#include "osdep.h"
    1.51 +#include <fcntl.h>
    1.52 +#include <time.h>
    1.53 +#include <sys/stat.h>
    1.54 +#include <sys/utime.h>
    1.55 +#include "misc.h"
    1.56 +#include "dummy.h"
    1.57 +
    1.58 +/* TENEX I/O stream local data */
    1.59 +	
    1.60 +typedef struct tenex_local {
    1.61 +  unsigned int shouldcheck: 1;	/* if ping should do a check instead */
    1.62 +  unsigned int mustcheck: 1;	/* if ping must do a check instead */
    1.63 +  int fd;			/* file descriptor for I/O */
    1.64 +  off_t filesize;		/* file size parsed */
    1.65 +  time_t filetime;		/* last file time */
    1.66 +  time_t lastsnarf;		/* local snarf time */
    1.67 +  unsigned char *buf;		/* temporary buffer */
    1.68 +  unsigned long buflen;		/* current size of temporary buffer */
    1.69 +  unsigned long uid;		/* current text uid */
    1.70 +  SIZEDTEXT text;		/* current text */
    1.71 +} TENEXLOCAL;
    1.72 +
    1.73 +
    1.74 +/* Convenient access to local data */
    1.75 +
    1.76 +#define LOCAL ((TENEXLOCAL *) stream->local)
    1.77 +
    1.78 +
    1.79 +/* Function prototypes */
    1.80 +
    1.81 +DRIVER *tenex_valid (char *name);
    1.82 +int tenex_isvalid (char *name,char *file);
    1.83 +void *tenex_parameters (long function,void *value);
    1.84 +void tenex_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
    1.85 +void tenex_list (MAILSTREAM *stream,char *ref,char *pat);
    1.86 +void tenex_lsub (MAILSTREAM *stream,char *ref,char *pat);
    1.87 +long tenex_create (MAILSTREAM *stream,char *mailbox);
    1.88 +long tenex_delete (MAILSTREAM *stream,char *mailbox);
    1.89 +long tenex_rename (MAILSTREAM *stream,char *old,char *newname);
    1.90 +long tenex_status (MAILSTREAM *stream,char *mbx,long flags);
    1.91 +MAILSTREAM *tenex_open (MAILSTREAM *stream);
    1.92 +void tenex_close (MAILSTREAM *stream,long options);
    1.93 +void tenex_fast (MAILSTREAM *stream,char *sequence,long flags);
    1.94 +void tenex_flags (MAILSTREAM *stream,char *sequence,long flags);
    1.95 +char *tenex_header (MAILSTREAM *stream,unsigned long msgno,
    1.96 +		    unsigned long *length,long flags);
    1.97 +long tenex_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
    1.98 +void tenex_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags);
    1.99 +void tenex_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
   1.100 +long tenex_ping (MAILSTREAM *stream);
   1.101 +void tenex_check (MAILSTREAM *stream);
   1.102 +void tenex_snarf (MAILSTREAM *stream);
   1.103 +long tenex_expunge (MAILSTREAM *stream,char *sequence,long options);
   1.104 +long tenex_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
   1.105 +long tenex_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
   1.106 +
   1.107 +unsigned long tenex_size (MAILSTREAM *stream,unsigned long m);
   1.108 +long tenex_parse (MAILSTREAM *stream);
   1.109 +MESSAGECACHE *tenex_elt (MAILSTREAM *stream,unsigned long msgno);
   1.110 +void tenex_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt);
   1.111 +void tenex_update_status (MAILSTREAM *stream,unsigned long msgno,
   1.112 +			  long syncflag);
   1.113 +unsigned long tenex_hdrpos (MAILSTREAM *stream,unsigned long msgno,
   1.114 +			    unsigned long *size);
   1.115 +
   1.116 +
   1.117 +/* Tenex mail routines */
   1.118 +
   1.119 +
   1.120 +/* Driver dispatch used by MAIL */
   1.121 +
   1.122 +DRIVER tenexdriver = {
   1.123 +  "tenex",			/* driver name */
   1.124 +  DR_LOCAL|DR_MAIL,		/* driver flags */
   1.125 +  (DRIVER *) NIL,		/* next driver */
   1.126 +  tenex_valid,			/* mailbox is valid for us */
   1.127 +  tenex_parameters,		/* manipulate parameters */
   1.128 +  tenex_scan,			/* scan mailboxes */
   1.129 +  tenex_list,			/* list mailboxes */
   1.130 +  tenex_lsub,			/* list subscribed mailboxes */
   1.131 +  NIL,				/* subscribe to mailbox */
   1.132 +  NIL,				/* unsubscribe from mailbox */
   1.133 +  tenex_create,			/* create mailbox */
   1.134 +  tenex_delete,			/* delete mailbox */
   1.135 +  tenex_rename,			/* rename mailbox */
   1.136 +  mail_status_default,		/* status of mailbox */
   1.137 +  tenex_open,			/* open mailbox */
   1.138 +  tenex_close,			/* close mailbox */
   1.139 +  tenex_flags,			/* fetch message "fast" attributes */
   1.140 +  tenex_flags,			/* fetch message flags */
   1.141 +  NIL,				/* fetch overview */
   1.142 +  NIL,				/* fetch message envelopes */
   1.143 +  tenex_header,			/* fetch message header */
   1.144 +  tenex_text,			/* fetch message body */
   1.145 +  NIL,				/* fetch partial message text */
   1.146 +  NIL,				/* unique identifier */
   1.147 +  NIL,				/* message number */
   1.148 +  tenex_flag,			/* modify flags */
   1.149 +  tenex_flagmsg,		/* per-message modify flags */
   1.150 +  NIL,				/* search for message based on criteria */
   1.151 +  NIL,				/* sort messages */
   1.152 +  NIL,				/* thread messages */
   1.153 +  tenex_ping,			/* ping mailbox to see if still alive */
   1.154 +  tenex_check,			/* check for new messages */
   1.155 +  tenex_expunge,		/* expunge deleted messages */
   1.156 +  tenex_copy,			/* copy messages to another mailbox */
   1.157 +  tenex_append,			/* append string message to mailbox */
   1.158 +  NIL				/* garbage collect stream */
   1.159 +};
   1.160 +
   1.161 +				/* prototype stream */
   1.162 +MAILSTREAM tenexproto = {&tenexdriver};
   1.163 +
   1.164 +/* Tenex mail validate mailbox
   1.165 + * Accepts: mailbox name
   1.166 + * Returns: our driver if name is valid, NIL otherwise
   1.167 + */
   1.168 +
   1.169 +DRIVER *tenex_valid (char *name)
   1.170 +{
   1.171 +  char tmp[MAILTMPLEN];
   1.172 +  return tenex_isvalid (name,tmp) ? &tenexdriver : NIL;
   1.173 +}
   1.174 +
   1.175 +
   1.176 +/* Tenex mail test for valid mailbox
   1.177 + * Accepts: mailbox name
   1.178 + *	    buffer to return file name
   1.179 + * Returns: T if valid, NIL otherwise
   1.180 + */
   1.181 +
   1.182 +int tenex_isvalid (char *name,char *file)
   1.183 +{
   1.184 +  int fd;
   1.185 +  int ret = NIL;
   1.186 +  char *s,tmp[MAILTMPLEN];
   1.187 +  struct stat sbuf;
   1.188 +  struct utimbuf times;
   1.189 +  errno = EINVAL;		/* assume invalid argument */
   1.190 +				/* if file, get its status */
   1.191 +  if ((s = dummy_file (file,name)) && !stat (s,&sbuf) &&
   1.192 +      ((sbuf.st_mode & S_IFMT) == S_IFREG)) {
   1.193 +    if (!sbuf.st_size)errno = 0;/* empty file */
   1.194 +    else if ((fd = open (file,O_BINARY|O_RDONLY,NIL)) >= 0) {
   1.195 +      memset (tmp,'\0',MAILTMPLEN);
   1.196 +      if ((read (fd,tmp,64) >= 0) && (s = strchr (tmp,'\012')) &&
   1.197 +	  (s[-1] != '\015')) {	/* valid format? */
   1.198 +	*s = '\0';		/* tie off header */
   1.199 +				/* must begin with dd-mmm-yy" */
   1.200 +	ret = (((tmp[2] == '-' && tmp[6] == '-') ||
   1.201 +		(tmp[1] == '-' && tmp[5] == '-')) &&
   1.202 +	       (s = strchr (tmp+18,',')) && strchr (s+2,';')) ? T : NIL;
   1.203 +      }
   1.204 +      else errno = -1;		/* bogus format */
   1.205 +      close (fd);		/* close the file */
   1.206 +				/* \Marked status? */
   1.207 +      if (sbuf.st_ctime > sbuf.st_atime) {
   1.208 +				/* preserve atime and mtime */
   1.209 +	times.actime = sbuf.st_atime;
   1.210 +	times.modtime = sbuf.st_mtime;
   1.211 +	utime (file,&times);	/* set the times */
   1.212 +      }
   1.213 +    }
   1.214 +  }
   1.215 +				/* in case INBOX but not tenex format */
   1.216 +  else if ((errno == ENOENT) && !compare_cstring (name,"INBOX")) errno = -1;
   1.217 +  return ret;			/* return what we should */
   1.218 +}
   1.219 +
   1.220 +
   1.221 +/* Tenex manipulate driver parameters
   1.222 + * Accepts: function code
   1.223 + *	    function-dependent value
   1.224 + * Returns: function-dependent return value
   1.225 + */
   1.226 +
   1.227 +void *tenex_parameters (long function,void *value)
   1.228 +{
   1.229 +  return NIL;
   1.230 +}
   1.231 +
   1.232 +/* Tenex mail scan mailboxes
   1.233 + * Accepts: mail stream
   1.234 + *	    reference
   1.235 + *	    pattern to search
   1.236 + *	    string to scan
   1.237 + */
   1.238 +
   1.239 +void tenex_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
   1.240 +{
   1.241 +  if (stream) dummy_scan (NIL,ref,pat,contents);
   1.242 +}
   1.243 +
   1.244 +
   1.245 +/* Tenex mail list mailboxes
   1.246 + * Accepts: mail stream
   1.247 + *	    reference
   1.248 + *	    pattern to search
   1.249 + */
   1.250 +
   1.251 +void tenex_list (MAILSTREAM *stream,char *ref,char *pat)
   1.252 +{
   1.253 +  if (stream) dummy_list (NIL,ref,pat);
   1.254 +}
   1.255 +
   1.256 +
   1.257 +/* Tenex mail list subscribed mailboxes
   1.258 + * Accepts: mail stream
   1.259 + *	    reference
   1.260 + *	    pattern to search
   1.261 + */
   1.262 +
   1.263 +void tenex_lsub (MAILSTREAM *stream,char *ref,char *pat)
   1.264 +{
   1.265 +  if (stream) dummy_lsub (NIL,ref,pat);
   1.266 +}
   1.267 +
   1.268 +/* Tenex mail create mailbox
   1.269 + * Accepts: MAIL stream
   1.270 + *	    mailbox name to create
   1.271 + * Returns: T on success, NIL on failure
   1.272 + */
   1.273 +
   1.274 +long tenex_create (MAILSTREAM *stream,char *mailbox)
   1.275 +{
   1.276 +  char *s,mbx[MAILTMPLEN];
   1.277 +  if (s = dummy_file (mbx,mailbox)) return dummy_create (stream,s);
   1.278 +  sprintf (mbx,"Can't create %.80s: invalid name",mailbox);
   1.279 +  mm_log (mbx,ERROR);
   1.280 +  return NIL;
   1.281 +}
   1.282 +
   1.283 +
   1.284 +/* Tenex mail delete mailbox
   1.285 + * Accepts: MAIL stream
   1.286 + *	    mailbox name to delete
   1.287 + * Returns: T on success, NIL on failure
   1.288 + */
   1.289 +
   1.290 +long tenex_delete (MAILSTREAM *stream,char *mailbox)
   1.291 +{
   1.292 +  return tenex_rename (stream,mailbox,NIL);
   1.293 +}
   1.294 +
   1.295 +/* Tenex mail rename mailbox
   1.296 + * Accepts: MAIL stream
   1.297 + *	    old mailbox name
   1.298 + *	    new mailbox name (or NIL for delete)
   1.299 + * Returns: T on success, NIL on failure
   1.300 + */
   1.301 +
   1.302 +long tenex_rename (MAILSTREAM *stream,char *old,char *newname)
   1.303 +{
   1.304 +  long ret = LONGT;
   1.305 +  char c,*s,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
   1.306 +  int fd,ld;
   1.307 +  struct stat sbuf;
   1.308 +  if (!dummy_file (file,old) ||
   1.309 +      (newname && (!((s = mailboxfile (tmp,newname)) && *s) ||
   1.310 +		   ((s = strrchr (tmp,'\\')) && !s[1])))) {
   1.311 +    sprintf (tmp,newname ?
   1.312 +	     "Can't rename mailbox %.80s to %.80s: invalid name" :
   1.313 +	     "Can't delete mailbox %.80s: invalid name",
   1.314 +	     old,newname);
   1.315 +    mm_log (tmp,ERROR);
   1.316 +    return NIL;
   1.317 +  }
   1.318 +  else if ((fd = open (file,O_BINARY|O_RDWR,NIL)) < 0) {
   1.319 +    sprintf (tmp,"Can't open mailbox %.80s: %s",old,strerror (errno));
   1.320 +    mm_log (tmp,ERROR);
   1.321 +    return NIL;
   1.322 +  }
   1.323 +				/* get exclusive parse/append permission */
   1.324 +  if ((ld = lockname (lock,file,LOCK_EX)) < 0) {
   1.325 +    mm_log ("Unable to lock rename mailbox",ERROR);
   1.326 +    return NIL;
   1.327 +  }
   1.328 +				/* lock out other users */
   1.329 +  if (flock (fd,LOCK_EX|LOCK_NB)) {
   1.330 +    close (fd);			/* couldn't lock, give up on it then */
   1.331 +    sprintf (tmp,"Mailbox %.80s is in use by another process",old);
   1.332 +    mm_log (tmp,ERROR);
   1.333 +    unlockfd (ld,lock);		/* release exclusive parse/append permission */
   1.334 +    return NIL;
   1.335 +  }
   1.336 +
   1.337 +  if (newname) {		/* want rename? */
   1.338 +				/* found superior to destination name? */
   1.339 +    if ((s = strrchr (tmp,'\\')) && (s != tmp) &&
   1.340 +	((tmp[1] != ':') || (s != tmp + 2))) {
   1.341 +      c = s[1];			/* remember character after delimiter */
   1.342 +      *s = s[1] = '\0';		/* tie off name at delimiter */
   1.343 +				/* name doesn't exist, create it */
   1.344 +      if (stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) {
   1.345 +	*s = '\\';		/* restore delimiter */
   1.346 +	if (!dummy_create (stream,tmp)) ret = NIL;
   1.347 +      }
   1.348 +      else *s = '\\';		/* restore delimiter */
   1.349 +      s[1] = c;			/* restore character after delimiter */
   1.350 +    }
   1.351 +    flock (fd,LOCK_UN);		/* release lock on the file */
   1.352 +    close (fd);			/* pacify NTFS */
   1.353 +				/* rename the file */
   1.354 +    if (ret && rename (file,tmp)) {
   1.355 +      sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",old,newname,
   1.356 +	       strerror (errno));
   1.357 +      mm_log (tmp,ERROR);
   1.358 +      ret = NIL;		/* set failure */
   1.359 +    }
   1.360 +  }
   1.361 +  else {
   1.362 +    flock (fd,LOCK_UN);		/* release lock on the file */
   1.363 +    close (fd);			/* pacify NTFS */
   1.364 +    if (unlink (file)) {
   1.365 +      sprintf (tmp,"Can't delete mailbox %.80s: %.80s",old,strerror (errno));
   1.366 +      mm_log (tmp,ERROR);
   1.367 +      ret = NIL;		/* set failure */
   1.368 +    }
   1.369 +  }
   1.370 +  unlockfd (ld,lock);		/* release exclusive parse/append permission */
   1.371 +  return ret;			/* return success */
   1.372 +}
   1.373 +
   1.374 +/* Tenex mail open
   1.375 + * Accepts: stream to open
   1.376 + * Returns: stream on success, NIL on failure
   1.377 + */
   1.378 +
   1.379 +MAILSTREAM *tenex_open (MAILSTREAM *stream)
   1.380 +{
   1.381 +  int fd,ld;
   1.382 +  char tmp[MAILTMPLEN];
   1.383 +				/* return prototype for OP_PROTOTYPE call */
   1.384 +  if (!stream) return &tenexproto;
   1.385 +  if (stream->local) fatal ("tenex recycle stream");
   1.386 +				/* canonicalize the mailbox name */
   1.387 +  if (!dummy_file (tmp,stream->mailbox)) {
   1.388 +    sprintf (tmp,"Can't open - invalid name: %.80s",stream->mailbox);
   1.389 +    mm_log (tmp,ERROR);
   1.390 +  }
   1.391 +  if (stream->rdonly ||
   1.392 +      (fd = open (tmp,O_BINARY|O_RDWR,NIL)) < 0) {
   1.393 +    if ((fd = open (tmp,O_BINARY|O_RDONLY,NIL)) < 0) {
   1.394 +      sprintf (tmp,"Can't open mailbox: %.80s",strerror (errno));
   1.395 +      mm_log (tmp,ERROR);
   1.396 +      return NIL;
   1.397 +    }
   1.398 +    else if (!stream->rdonly) {	/* got it, but readonly */
   1.399 +      mm_log ("Can't get write access to mailbox, access is readonly",WARN);
   1.400 +      stream->rdonly = T;
   1.401 +    }
   1.402 +  }
   1.403 +  stream->local = fs_get (sizeof (TENEXLOCAL));
   1.404 +  LOCAL->fd = fd;		/* bind the file */
   1.405 +  LOCAL->buf = (char *) fs_get (CHUNKSIZE);
   1.406 +  LOCAL->buflen = CHUNKSIZE - 1;
   1.407 +  LOCAL->text.data = (unsigned char *) fs_get (CHUNKSIZE);
   1.408 +  LOCAL->text.size = CHUNKSIZE - 1;
   1.409 +				/* note if an INBOX or not */
   1.410 +  stream->inbox = !compare_cstring (stream->mailbox,"INBOX");
   1.411 +  fs_give ((void **) &stream->mailbox);
   1.412 +  stream->mailbox = cpystr (tmp);
   1.413 +				/* get shared parse permission */
   1.414 +  if ((ld = lockname (tmp,stream->mailbox,LOCK_SH)) < 0) {
   1.415 +    mm_log ("Unable to lock open mailbox",ERROR);
   1.416 +    return NIL;
   1.417 +  }
   1.418 +  flock (LOCAL->fd,LOCK_SH);	/* lock the file */
   1.419 +  unlockfd (ld,tmp);		/* release shared parse permission */
   1.420 +  LOCAL->filesize = 0;		/* initialize parsed file size */
   1.421 +  LOCAL->filetime = 0;		/* time not set up yet */
   1.422 +  LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
   1.423 +  stream->sequence++;		/* bump sequence number */
   1.424 +  stream->uid_validity = (unsigned long) time (0);
   1.425 +				/* parse mailbox */
   1.426 +  stream->nmsgs = stream->recent = 0;
   1.427 +  if (tenex_ping (stream) && !stream->nmsgs)
   1.428 +    mm_log ("Mailbox is empty",(long) NIL);
   1.429 +  if (!LOCAL) return NIL;	/* failure if stream died */
   1.430 +  stream->perm_seen = stream->perm_deleted =
   1.431 +    stream->perm_flagged = stream->perm_answered = stream->perm_draft =
   1.432 +      stream->rdonly ? NIL : T;
   1.433 +  stream->perm_user_flags = stream->rdonly ? NIL : 0xffffffff;
   1.434 +  return stream;		/* return stream to caller */
   1.435 +}
   1.436 +
   1.437 +/* Tenex mail close
   1.438 + * Accepts: MAIL stream
   1.439 + *	    close options
   1.440 + */
   1.441 +
   1.442 +void tenex_close (MAILSTREAM *stream,long options)
   1.443 +{
   1.444 +  if (stream && LOCAL) {	/* only if a file is open */
   1.445 +    int silent = stream->silent;
   1.446 +    stream->silent = T;		/* note this stream is dying */
   1.447 +    if (options & CL_EXPUNGE) tenex_expunge (stream,NIL,NIL);
   1.448 +    stream->silent = silent;	/* restore previous status */
   1.449 +    flock (LOCAL->fd,LOCK_UN);	/* unlock local file */
   1.450 +    close (LOCAL->fd);		/* close the local file */
   1.451 +				/* free local text buffer */
   1.452 +    if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
   1.453 +    if (LOCAL->text.data) fs_give ((void **) &LOCAL->text.data);
   1.454 +				/* nuke the local data */
   1.455 +    fs_give ((void **) &stream->local);
   1.456 +    stream->dtb = NIL;		/* log out the DTB */
   1.457 +  }
   1.458 +}
   1.459 +
   1.460 +/* Tenex mail fetch flags
   1.461 + * Accepts: MAIL stream
   1.462 + *	    sequence
   1.463 + *	    option flags
   1.464 + * Sniffs at file to get flags
   1.465 + */
   1.466 +
   1.467 +void tenex_flags (MAILSTREAM *stream,char *sequence,long flags)
   1.468 +{
   1.469 +  STRING bs;
   1.470 +  MESSAGECACHE *elt;
   1.471 +  unsigned long i;
   1.472 +  if (stream && LOCAL &&
   1.473 +      ((flags & FT_UID) ? mail_uid_sequence (stream,sequence) :
   1.474 +       mail_sequence (stream,sequence)))
   1.475 +    for (i = 1; i <= stream->nmsgs; i++)
   1.476 +      if ((elt = mail_elt (stream,i))->sequence) {
   1.477 +	if (!elt->rfc822_size) { /* have header size yet? */
   1.478 +	  lseek (LOCAL->fd,elt->private.special.offset +
   1.479 +		 elt->private.special.text.size,L_SET);
   1.480 +				/* resize bigbuf if necessary */
   1.481 +	  if (LOCAL->buflen < elt->private.msg.full.text.size) {
   1.482 +	    fs_give ((void **) &LOCAL->buf);
   1.483 +	    LOCAL->buflen = elt->private.msg.full.text.size;
   1.484 +	    LOCAL->buf = (char *) fs_get (LOCAL->buflen + 1);
   1.485 +	  }
   1.486 +				/* tie off string */
   1.487 +	  LOCAL->buf[elt->private.msg.full.text.size] = '\0';
   1.488 +				/* read in the message */
   1.489 +	  read (LOCAL->fd,LOCAL->buf,elt->private.msg.full.text.size);
   1.490 +	  INIT (&bs,mail_string,(void *) LOCAL->buf,
   1.491 +		elt->private.msg.full.text.size);
   1.492 +				/* calculate its CRLF size */
   1.493 +	  elt->rfc822_size = unix_crlflen (&bs);
   1.494 +	}
   1.495 +	tenex_elt (stream,i);	/* get current flags from file */
   1.496 +      }
   1.497 +}
   1.498 +
   1.499 +/* TENEX mail fetch message header
   1.500 + * Accepts: MAIL stream
   1.501 + *	    message # to fetch
   1.502 + *	    pointer to returned header text length
   1.503 + *	    option flags
   1.504 + * Returns: message header in RFC822 format
   1.505 + */
   1.506 +
   1.507 +char *tenex_header (MAILSTREAM *stream,unsigned long msgno,
   1.508 +		    unsigned long *length,long flags)
   1.509 +{
   1.510 +  char *s;
   1.511 +  unsigned long i;
   1.512 +  *length = 0;			/* default to empty */
   1.513 +  if (flags & FT_UID) return "";/* UID call "impossible" */
   1.514 +				/* get to header position */
   1.515 +  lseek (LOCAL->fd,tenex_hdrpos (stream,msgno,&i),L_SET);
   1.516 +  if (flags & FT_INTERNAL) {
   1.517 +    if (i > LOCAL->buflen) {	/* resize if not enough space */
   1.518 +      fs_give ((void **) &LOCAL->buf);
   1.519 +      LOCAL->buf = (char *) fs_get (LOCAL->buflen = i + 1);
   1.520 +    }
   1.521 +				/* slurp the data */
   1.522 +    read (LOCAL->fd,LOCAL->buf,*length = i);
   1.523 +  }
   1.524 +  else {
   1.525 +    s = (char *) fs_get (i + 1);/* get readin buffer */
   1.526 +    s[i] = '\0';		/* tie off string */
   1.527 +    read (LOCAL->fd,s,i);	/* slurp the data */
   1.528 +				/* make CRLF copy of string */
   1.529 +    *length = unix_crlfcpy (&LOCAL->buf,&LOCAL->buflen,s,i);
   1.530 +    fs_give ((void **) &s);	/* free readin buffer */
   1.531 +  }
   1.532 +  return LOCAL->buf;
   1.533 +}
   1.534 +
   1.535 +/* TENEX mail fetch message text (body only)
   1.536 + * Accepts: MAIL stream
   1.537 + *	    message # to fetch
   1.538 + *	    pointer to returned stringstruct
   1.539 + *	    option flags
   1.540 + * Returns: T, always
   1.541 + */
   1.542 +
   1.543 +long tenex_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
   1.544 +{
   1.545 +  char *s;
   1.546 +  unsigned long i,j;
   1.547 +  MESSAGECACHE *elt;
   1.548 +				/* UID call "impossible" */
   1.549 +  if (flags & FT_UID) return NIL;
   1.550 +				/* get message status */
   1.551 +  elt = tenex_elt (stream,msgno);
   1.552 +				/* if message not seen */
   1.553 +  if (!(flags & FT_PEEK) && !elt->seen) {
   1.554 +    elt->seen = T;		/* mark message as seen */
   1.555 +				/* recalculate status */
   1.556 +    tenex_update_status (stream,msgno,T);
   1.557 +    mm_flags (stream,msgno);
   1.558 +  }
   1.559 +  if (flags & FT_INTERNAL) {	/* if internal representation wanted */
   1.560 +				/* find header position */
   1.561 +    i = tenex_hdrpos (stream,msgno,&j);
   1.562 +    if (i > LOCAL->buflen) {	/* resize if not enough space */
   1.563 +      fs_give ((void **) &LOCAL->buf);
   1.564 +      LOCAL->buf = (char *) fs_get (LOCAL->buflen = i + 1);
   1.565 +    }
   1.566 +				/* go to text position */
   1.567 +    lseek (LOCAL->fd,i + j,L_SET);
   1.568 +				/* slurp the data */
   1.569 +    if (read (LOCAL->fd,LOCAL->buf,i) != (long) i) return NIL;
   1.570 +				/* set up stringstruct for internal */
   1.571 +    INIT (bs,mail_string,LOCAL->buf,i);
   1.572 +  }
   1.573 +  else {			/* normal form, previous text cached? */
   1.574 +    if (elt->private.uid == LOCAL->uid)
   1.575 +      i = elt->private.msg.text.text.size;
   1.576 +    else {			/* not cached, cache it now */
   1.577 +      LOCAL->uid = elt->private.uid;
   1.578 +				/* find header position */
   1.579 +      i = tenex_hdrpos (stream,msgno,&j);
   1.580 +				/* go to text position */
   1.581 +      lseek (LOCAL->fd,i + j,L_SET);
   1.582 +      s = (char *) fs_get ((i = tenex_size (stream,msgno) - j) + 1);
   1.583 +      s[i] = '\0';		/* tie off string */
   1.584 +      read (LOCAL->fd,s,i);	/* slurp the data */
   1.585 +				/* make CRLF copy of string */
   1.586 +      i = elt->private.msg.text.text.size =
   1.587 +	strcrlfcpy (&LOCAL->text.data,&LOCAL->text.size,s,i);
   1.588 +      fs_give ((void **) &s);	/* free readin buffer */
   1.589 +    }
   1.590 +				/* set up stringstruct */
   1.591 +    INIT (bs,mail_string,LOCAL->text.data,i);
   1.592 +  }
   1.593 +  return T;			/* success */
   1.594 +}
   1.595 +
   1.596 +/* Tenex mail modify flags
   1.597 + * Accepts: MAIL stream
   1.598 + *	    sequence
   1.599 + *	    flag(s)
   1.600 + *	    option flags
   1.601 + */
   1.602 +
   1.603 +void tenex_flag (MAILSTREAM *stream,char *sequence,char *flag,long flags)
   1.604 +{
   1.605 +  struct utimbuf times;
   1.606 +  struct stat sbuf;
   1.607 +  if (!stream->rdonly) {	/* make sure the update takes */
   1.608 +    fsync (LOCAL->fd);
   1.609 +    fstat (LOCAL->fd,&sbuf);	/* get current write time */
   1.610 +    times.modtime = LOCAL->filetime = sbuf.st_mtime;
   1.611 +    times.actime = time (0);	/* make sure read comes after all that */
   1.612 +    utime (stream->mailbox,&times);
   1.613 +  }
   1.614 +}
   1.615 +
   1.616 +
   1.617 +/* Tenex mail per-message modify flags
   1.618 + * Accepts: MAIL stream
   1.619 + *	    message cache element
   1.620 + */
   1.621 +
   1.622 +void tenex_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
   1.623 +{
   1.624 +  struct stat sbuf;
   1.625 +				/* maybe need to do a checkpoint? */
   1.626 +  if (LOCAL->filetime && !LOCAL->shouldcheck) {
   1.627 +    fstat (LOCAL->fd,&sbuf);	/* get current write time */
   1.628 +    if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
   1.629 +    LOCAL->filetime = 0;	/* don't do this test for any other messages */
   1.630 +  }
   1.631 +				/* recalculate status */
   1.632 +  tenex_update_status (stream,elt->msgno,NIL);
   1.633 +}
   1.634 +
   1.635 +/* Tenex mail ping mailbox
   1.636 + * Accepts: MAIL stream
   1.637 + * Returns: T if stream still alive, NIL if not
   1.638 + */
   1.639 +
   1.640 +long tenex_ping (MAILSTREAM *stream)
   1.641 +{
   1.642 +  unsigned long i = 1;
   1.643 +  long r = T;
   1.644 +  int ld;
   1.645 +  char lock[MAILTMPLEN];
   1.646 +  struct stat sbuf;
   1.647 +  if (stream && LOCAL) {	/* only if stream already open */
   1.648 +    fstat (LOCAL->fd,&sbuf);	/* get current file poop */
   1.649 +    if (LOCAL->filetime && !(LOCAL->mustcheck || LOCAL->shouldcheck) &&
   1.650 +	(LOCAL->filetime < sbuf.st_mtime)) LOCAL->shouldcheck = T;
   1.651 +				/* check for changed message status */
   1.652 +    if (LOCAL->mustcheck || LOCAL->shouldcheck) {
   1.653 +      LOCAL->filetime = sbuf.st_mtime;
   1.654 +      if (LOCAL->shouldcheck)	/* babble when we do this unilaterally */
   1.655 +	mm_notify (stream,"[CHECK] Checking for flag updates",NIL);
   1.656 +      while (i <= stream->nmsgs) tenex_elt (stream,i++);
   1.657 +      LOCAL->mustcheck = LOCAL->shouldcheck = NIL;
   1.658 +    }
   1.659 +				/* get shared parse/append permission */
   1.660 +    if ((sbuf.st_size != LOCAL->filesize) &&
   1.661 +	((ld = lockname (lock,stream->mailbox,LOCK_SH)) >= 0)) {
   1.662 +				/* parse resulting mailbox */
   1.663 +      r = (tenex_parse (stream)) ? T : NIL;
   1.664 +      unlockfd (ld,lock);	/* release shared parse/append permission */
   1.665 +    }
   1.666 +  }
   1.667 +  return r;			/* return result of the parse */
   1.668 +}
   1.669 +
   1.670 +
   1.671 +/* Tenex mail check mailbox (reparses status too)
   1.672 + * Accepts: MAIL stream
   1.673 + */
   1.674 +
   1.675 +void tenex_check (MAILSTREAM *stream)
   1.676 +{
   1.677 +				/* mark that a check is desired */
   1.678 +  if (LOCAL) LOCAL->mustcheck = T;
   1.679 +  if (tenex_ping (stream)) mm_log ("Check completed",(long) NIL);
   1.680 +}
   1.681 +
   1.682 +/* Tenex mail expunge mailbox
   1.683 + *	    sequence to expunge if non-NIL
   1.684 + *	    expunge options
   1.685 + * Returns: T, always
   1.686 + */
   1.687 +
   1.688 +long tenex_expunge (MAILSTREAM *stream,char *sequence,long options)
   1.689 +{
   1.690 +  long ret;
   1.691 +  struct utimbuf times;
   1.692 +  struct stat sbuf;
   1.693 +  off_t pos = 0;
   1.694 +  int ld;
   1.695 +  unsigned long i = 1;
   1.696 +  unsigned long j,k,m,recent;
   1.697 +  unsigned long n = 0;
   1.698 +  unsigned long delta = 0;
   1.699 +  char lock[MAILTMPLEN];
   1.700 +  MESSAGECACHE *elt;
   1.701 +  if (!(ret = (sequence ? ((options & EX_UID) ?
   1.702 +			   mail_uid_sequence (stream,sequence) :
   1.703 +			   mail_sequence (stream,sequence)) : LONGT) &&
   1.704 +	tenex_ping (stream)));	/* parse sequence if given, ping stream */
   1.705 +  else if (stream->rdonly) mm_log ("Expunge ignored on readonly mailbox",WARN);
   1.706 +  else {
   1.707 +    if (LOCAL->filetime && !LOCAL->shouldcheck) {
   1.708 +      fstat (LOCAL->fd,&sbuf);	/* get current write time */
   1.709 +      if (LOCAL->filetime < sbuf.st_mtime) LOCAL->shouldcheck = T;
   1.710 +    }
   1.711 +				/* get exclusive access */
   1.712 +    if ((ld = lockname (lock,stream->mailbox,LOCK_EX)) < 0)
   1.713 +      mm_log ("Unable to lock expunge mailbox",ERROR);
   1.714 +				/* make sure see any newly-arrived messages */
   1.715 +    else if (!tenex_parse (stream));
   1.716 +				/* get exclusive access */
   1.717 +    else if (flock (LOCAL->fd,LOCK_EX|LOCK_NB)) {
   1.718 +      flock (LOCAL->fd,LOCK_SH);/* recover previous lock */
   1.719 +      mm_log ("Can't expunge because mailbox is in use by another process",
   1.720 +	      ERROR);
   1.721 +      unlockfd (ld,lock);	/* release exclusive parse/append permission */
   1.722 +    }
   1.723 +
   1.724 +    else {
   1.725 +      mm_critical (stream);	/* go critical */
   1.726 +      recent = stream->recent;	/* get recent now that pinged and locked */
   1.727 +				/* for each message */
   1.728 +      while (i <= stream->nmsgs) {
   1.729 +				/* get cache element */
   1.730 +	elt = tenex_elt (stream,i);
   1.731 +				/* number of bytes to smash or preserve */
   1.732 +	k = elt->private.special.text.size + tenex_size (stream,i);
   1.733 +				/* if need to expunge this message */
   1.734 +	if (elt->deleted && (sequence ? elt->sequence : T)) {
   1.735 +				/* if recent, note one less recent message */
   1.736 +	  if (elt->recent) --recent;
   1.737 +	  delta += k;		/* number of bytes to delete */
   1.738 +				/* notify upper levels */
   1.739 +	  mail_expunged (stream,i);
   1.740 +	  n++;			/* count up one more expunged message */
   1.741 +	}
   1.742 +	else if (i++ && delta) {/* preserved message */
   1.743 +				/* first byte to preserve */
   1.744 +	  j = elt->private.special.offset;
   1.745 +	  do {			/* read from source position */
   1.746 +	    m = min (k,LOCAL->buflen);
   1.747 +	    lseek (LOCAL->fd,j,L_SET);
   1.748 +	    read (LOCAL->fd,LOCAL->buf,m);
   1.749 +	    pos = j - delta;	/* write to destination position */
   1.750 +	    while (T) {
   1.751 +	      lseek (LOCAL->fd,pos,L_SET);
   1.752 +	      if (write (LOCAL->fd,LOCAL->buf,m) > 0) break;
   1.753 +	      mm_notify (stream,strerror (errno),WARN);
   1.754 +	      mm_diskerror (stream,errno,T);
   1.755 +	    }
   1.756 +	    pos += m;		/* new position */
   1.757 +	    j += m;		/* next chunk, perhaps */
   1.758 +	  } while (k -= m);	/* until done */
   1.759 +				/* note the new address of this text */
   1.760 +	  elt->private.special.offset -= delta;
   1.761 +	}
   1.762 +				/* preserved but no deleted messages */
   1.763 +	else pos = elt->private.special.offset + k;
   1.764 +      }
   1.765 +
   1.766 +      if (n) {			/* truncate file after last message */
   1.767 +	if (pos != (LOCAL->filesize -= delta)) {
   1.768 +	  sprintf (LOCAL->buf,
   1.769 +		   "Calculated size mismatch %lu != %lu, delta = %lu",
   1.770 +		   (unsigned long) pos,(unsigned long) LOCAL->filesize,delta);
   1.771 +	  mm_log (LOCAL->buf,WARN);
   1.772 +	  LOCAL->filesize = pos;/* fix it then */
   1.773 +	}
   1.774 +	ftruncate (LOCAL->fd,LOCAL->filesize);
   1.775 +	sprintf (LOCAL->buf,"Expunged %lu messages",n);
   1.776 +				/* output the news */
   1.777 +	mm_log (LOCAL->buf,(long) NIL);
   1.778 +      }
   1.779 +      else mm_log ("No messages deleted, so no update needed",(long) NIL);
   1.780 +      fsync (LOCAL->fd);	/* force disk update */
   1.781 +      fstat (LOCAL->fd,&sbuf);	/* get new write time */
   1.782 +      times.modtime = LOCAL->filetime = sbuf.st_mtime;
   1.783 +      times.actime = time (0);	/* reset atime to now */
   1.784 +      utime (stream->mailbox,&times);
   1.785 +      mm_nocritical (stream);	/* release critical */
   1.786 +				/* notify upper level of new mailbox size */
   1.787 +      mail_exists (stream,stream->nmsgs);
   1.788 +      mail_recent (stream,recent);
   1.789 +      flock (LOCAL->fd,LOCK_SH);/* allow sharers again */
   1.790 +      unlockfd (ld,lock);	/* release exclusive parse/append permission */
   1.791 +    }
   1.792 +  }
   1.793 +  return ret;
   1.794 +}
   1.795 +
   1.796 +/* Tenex mail copy message(s)
   1.797 + * Accepts: MAIL stream
   1.798 + *	    sequence
   1.799 + *	    destination mailbox
   1.800 + *	    copy options
   1.801 + * Returns: T if success, NIL if failed
   1.802 + */
   1.803 +
   1.804 +long tenex_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
   1.805 +{
   1.806 +  struct stat sbuf;
   1.807 +  struct utimbuf times;
   1.808 +  MESSAGECACHE *elt;
   1.809 +  unsigned long i,j,k;
   1.810 +  long ret = LONGT;
   1.811 +  int fd,ld;
   1.812 +  char file[MAILTMPLEN],lock[MAILTMPLEN];
   1.813 +  mailproxycopy_t pc =
   1.814 +    (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
   1.815 +				/* make sure valid mailbox */
   1.816 +  if (!tenex_isvalid (mailbox,file)) switch (errno) {
   1.817 +  case ENOENT:			/* no such file? */
   1.818 +    mm_notify (stream,"[TRYCREATE] Must create mailbox before copy",NIL);
   1.819 +    return NIL;
   1.820 +  case 0:			/* merely empty file? */
   1.821 +    break;
   1.822 +  case EACCES:			/* file protected */
   1.823 +    sprintf (LOCAL->buf,"Can't access destination: %.80s",mailbox);
   1.824 +    MM_LOG (LOCAL->buf,ERROR);
   1.825 +    return NIL;
   1.826 +  case EINVAL:
   1.827 +    if (pc) return (*pc) (stream,sequence,mailbox,options);
   1.828 +    sprintf (LOCAL->buf,"Invalid Tenex-format mailbox name: %.80s",mailbox);
   1.829 +    mm_log (LOCAL->buf,ERROR);
   1.830 +    return NIL;
   1.831 +  default:
   1.832 +    if (pc) return (*pc) (stream,sequence,mailbox,options);
   1.833 +    sprintf (LOCAL->buf,"Not a Tenex-format mailbox: %.80s",mailbox);
   1.834 +    mm_log (LOCAL->buf,ERROR);
   1.835 +    return NIL;
   1.836 +  }
   1.837 +  if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
   1.838 +	mail_sequence (stream,sequence))) return NIL;
   1.839 +				/* got file? */  
   1.840 +  if ((fd = open (file,O_BINARY|O_RDWR|O_CREAT,S_IREAD|S_IWRITE)) < 0) {
   1.841 +    sprintf (LOCAL->buf,"Unable to open copy mailbox: %.80s",strerror (errno));
   1.842 +    mm_log (LOCAL->buf,ERROR);
   1.843 +    return NIL;
   1.844 +  }
   1.845 +  mm_critical (stream);		/* go critical */
   1.846 +				/* get exclusive parse/append permission */
   1.847 +  if (flock (fd,LOCK_SH) || ((ld = lockname (lock,file,LOCK_EX)) < 0)) {
   1.848 +    mm_log ("Unable to lock copy mailbox",ERROR);
   1.849 +    mm_nocritical (stream);
   1.850 +    return NIL;
   1.851 +  }
   1.852 +  fstat (fd,&sbuf);		/* get current file size */
   1.853 +  lseek (fd,sbuf.st_size,L_SET);/* move to end of file */
   1.854 +
   1.855 +				/* for each requested message */
   1.856 +  for (i = 1; ret && (i <= stream->nmsgs); i++) 
   1.857 +    if ((elt = mail_elt (stream,i))->sequence) {
   1.858 +      lseek (LOCAL->fd,elt->private.special.offset,L_SET);
   1.859 +				/* number of bytes to copy */
   1.860 +      k = elt->private.special.text.size + tenex_size (stream,i);
   1.861 +      do {			/* read from source position */
   1.862 +	j = min (k,LOCAL->buflen);
   1.863 +	read (LOCAL->fd,LOCAL->buf,j);
   1.864 +	if (write (fd,LOCAL->buf,j) < 0) ret = NIL;
   1.865 +      } while (ret && (k -= j));/* until done */
   1.866 +    }
   1.867 +				/* delete all requested messages */
   1.868 +  if (ret && (options & CP_MOVE)) {
   1.869 +    sprintf (LOCAL->buf,"Unable to write message: %s",strerror (errno));
   1.870 +    mm_log (LOCAL->buf,ERROR);
   1.871 +    ftruncate (fd,sbuf.st_size);
   1.872 +  }
   1.873 +				/* set atime to now-1 if successful copy */
   1.874 +  if (ret) times.actime = time (0) - 1;
   1.875 +				/* else preserved \Marked status */
   1.876 +  else times.actime = (sbuf.st_ctime > sbuf.st_atime) ?
   1.877 +	 sbuf.st_atime : time (0);
   1.878 +  times.modtime = sbuf.st_mtime;/* preserve mtime */
   1.879 +  utime (file,&times);		/* set the times */
   1.880 +  unlockfd (ld,lock);		/* release exclusive parse/append permission */
   1.881 +  close (fd);			/* close the file */
   1.882 +  mm_nocritical (stream);	/* release critical */
   1.883 +				/* delete all requested messages */
   1.884 +  if (ret && (options & CP_MOVE)) {
   1.885 +    for (i = 1; i <= stream->nmsgs; i++)
   1.886 +      if ((elt = tenex_elt (stream,i))->sequence) {
   1.887 +	elt->deleted = T;	/* mark message deleted */
   1.888 +				/* recalculate status */
   1.889 +	tenex_update_status (stream,i,NIL);
   1.890 +      }
   1.891 +    if (!stream->rdonly) {	/* make sure the update takes */
   1.892 +      fsync (LOCAL->fd);
   1.893 +      fstat (LOCAL->fd,&sbuf);	/* get current write time */
   1.894 +      times.modtime = LOCAL->filetime = sbuf.st_mtime;
   1.895 +      times.actime = time (0);	/* make sure atime remains greater */
   1.896 +      utime (stream->mailbox,&times);
   1.897 +    }
   1.898 +  }
   1.899 +  if (ret && mail_parameters (NIL,GET_COPYUID,NIL))
   1.900 +    mm_log ("Can not return meaningful COPYUID with this mailbox format",WARN);
   1.901 +  return ret;
   1.902 +}
   1.903 +
   1.904 +/* Tenex mail append message from stringstruct
   1.905 + * Accepts: MAIL stream
   1.906 + *	    destination mailbox
   1.907 + *	    append callback
   1.908 + *	    data for callback
   1.909 + * Returns: T if append successful, else NIL
   1.910 + */
   1.911 +
   1.912 +long tenex_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
   1.913 +{
   1.914 +  struct stat sbuf;
   1.915 +  int fd,ld,c;
   1.916 +  char *flags,*date,tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
   1.917 +  struct utimbuf times;
   1.918 +  FILE *df;
   1.919 +  MESSAGECACHE elt;
   1.920 +  long f;
   1.921 +  unsigned long i,j,uf,size;
   1.922 +  STRING *message;
   1.923 +  long ret = LONGT;
   1.924 +				/* default stream to prototype */
   1.925 +  if (!stream) stream = &tenexproto;
   1.926 +				/* make sure valid mailbox */
   1.927 +  if (!tenex_isvalid (mailbox,file)) switch (errno) {
   1.928 +  case ENOENT:			/* no such file? */
   1.929 +    if (!compare_cstring (mailbox,"INBOX")) tenex_create (NIL,"INBOX");
   1.930 +    else {
   1.931 +      mm_notify (stream,"[TRYCREATE] Must create mailbox before append",NIL);
   1.932 +      return NIL;
   1.933 +    }
   1.934 +				/* falls through */
   1.935 +  case 0:			/* merely empty file? */
   1.936 +    break;
   1.937 +  case EACCES:			/* file protected */
   1.938 +    sprintf (tmp,"Can't access destination: %.80s",mailbox);
   1.939 +    MM_LOG (tmp,ERROR);
   1.940 +    return NIL;
   1.941 +  case EINVAL:
   1.942 +    sprintf (tmp,"Invalid TENEX-format mailbox name: %.80s",mailbox);
   1.943 +    mm_log (tmp,ERROR);
   1.944 +    return NIL;
   1.945 +  default:
   1.946 +    sprintf (tmp,"Not a TENEX-format mailbox: %.80s",mailbox);
   1.947 +    mm_log (tmp,ERROR);
   1.948 +    return NIL;
   1.949 +  }
   1.950 +				/* get first message */
   1.951 +  if (!(*af) (stream,data,&flags,&date,&message)) return NIL;
   1.952 +
   1.953 +				/* open destination mailbox */
   1.954 +  if (((fd = open (file,O_BINARY|O_WRONLY|O_APPEND|O_CREAT,S_IREAD|S_IWRITE))
   1.955 +       < 0) || !(df = fdopen (fd,"ab"))) {
   1.956 +    sprintf (tmp,"Can't open append mailbox: %s",strerror (errno));
   1.957 +    mm_log (tmp,ERROR);
   1.958 +    return NIL;
   1.959 +  }
   1.960 +				/* get parse/append permission */
   1.961 +  if (flock (fd,LOCK_SH) || ((ld = lockname (lock,file,LOCK_EX)) < 0)) {
   1.962 +    mm_log ("Unable to lock append mailbox",ERROR);
   1.963 +    close (fd);
   1.964 +    return NIL;
   1.965 +  }
   1.966 +  mm_critical (stream);		/* go critical */
   1.967 +  fstat (fd,&sbuf);		/* get current file size */
   1.968 +  errno = 0;
   1.969 +  do {				/* parse flags */
   1.970 +    if (!SIZE (message)) {	/* guard against zero-length */
   1.971 +      mm_log ("Append of zero-length message",ERROR);
   1.972 +      ret = NIL;
   1.973 +      break;
   1.974 +    }
   1.975 +    f = mail_parse_flags (stream,flags,&i);
   1.976 +				/* reverse bits (dontcha wish we had CIRC?) */
   1.977 +    for (uf = 0; i; uf |= 1 << (29 - find_rightmost_bit (&i)));
   1.978 +    if (date) {			/* parse date if given */
   1.979 +      if (!mail_parse_date (&elt,date)) {
   1.980 +	sprintf (tmp,"Bad date in append: %.80s",date);
   1.981 +	mm_log (tmp,ERROR);
   1.982 +	ret = NIL;		/* mark failure */
   1.983 +	break;
   1.984 +      }
   1.985 +      mail_date (tmp,&elt);	/* write preseved date */
   1.986 +    }
   1.987 +    else internal_date (tmp);	/* get current date in IMAP format */
   1.988 +    i = GETPOS (message);	/* remember current position */
   1.989 +    for (j = SIZE (message), size = 0; j; --j)
   1.990 +      if (SNX (message) != '\015') ++size;
   1.991 +    SETPOS (message,i);		/* restore position */
   1.992 +				/* write header */
   1.993 +    if (fprintf (df,"%s,%lu;%010lo%02lo\n",tmp,size,uf,(unsigned long) f) < 0)
   1.994 +      ret = NIL;
   1.995 +    else {			/* write message */
   1.996 +      while (size) if ((c = 0xff & SNX (message)) != '\015') {
   1.997 +	if (putc (c,df) != EOF) --size;
   1.998 +	else break;
   1.999 +      }
  1.1000 +				/* get next message */
  1.1001 +      if (size || !(*af) (stream,data,&flags,&date,&message)) ret = NIL;
  1.1002 +    }
  1.1003 +  } while (ret && message);
  1.1004 +				/* if error... */
  1.1005 +  if (!ret || (fflush (df) == EOF)) {
  1.1006 +    ftruncate (fd,sbuf.st_size);/* revert file */
  1.1007 +    close (fd);			/* make sure fclose() doesn't corrupt us */
  1.1008 +    if (errno) {
  1.1009 +      sprintf (tmp,"Message append failed: %s",strerror (errno));
  1.1010 +      mm_log (tmp,ERROR);
  1.1011 +    }
  1.1012 +    ret = NIL;
  1.1013 +  }
  1.1014 +  if (ret) times.actime = time (0) - 1;
  1.1015 +				/* else preserved \Marked status */
  1.1016 +  else times.actime = (sbuf.st_ctime > sbuf.st_atime) ?
  1.1017 +	 sbuf.st_atime : time (0);
  1.1018 +  times.modtime = sbuf.st_mtime;/* preserve mtime */
  1.1019 +  utime (file,&times);		/* set the times */
  1.1020 +  fclose (df);			/* close the file */
  1.1021 +  unlockfd (ld,lock);		/* release exclusive parse/append permission */
  1.1022 +  mm_nocritical (stream);	/* release critical */
  1.1023 +  if (ret && mail_parameters (NIL,GET_APPENDUID,NIL))
  1.1024 +    mm_log ("Can not return meaningful APPENDUID with this mailbox format",
  1.1025 +	    WARN);
  1.1026 +  return ret;
  1.1027 +}
  1.1028 +
  1.1029 +/* Internal routines */
  1.1030 +
  1.1031 +
  1.1032 +/* Tenex mail return internal message size in bytes
  1.1033 + * Accepts: MAIL stream
  1.1034 + *	    message #
  1.1035 + * Returns: internal size of message
  1.1036 + */
  1.1037 +
  1.1038 +unsigned long tenex_size (MAILSTREAM *stream,unsigned long m)
  1.1039 +{
  1.1040 +  MESSAGECACHE *elt = mail_elt (stream,m);
  1.1041 +  return ((m < stream->nmsgs) ? mail_elt (stream,m+1)->private.special.offset :
  1.1042 +	  LOCAL->filesize) -
  1.1043 +	    (elt->private.special.offset + elt->private.special.text.size);
  1.1044 +}
  1.1045 +
  1.1046 +/* Tenex mail parse mailbox
  1.1047 + * Accepts: MAIL stream
  1.1048 + * Returns: T if parse OK
  1.1049 + *	    NIL if failure, stream aborted
  1.1050 + */
  1.1051 +
  1.1052 +long tenex_parse (MAILSTREAM *stream)
  1.1053 +{
  1.1054 +  struct stat sbuf;
  1.1055 +  MESSAGECACHE *elt = NIL;
  1.1056 +  unsigned char c,*s,*t,*x;
  1.1057 +  char tmp[MAILTMPLEN];
  1.1058 +  unsigned long i,j;
  1.1059 +  long curpos = LOCAL->filesize;
  1.1060 +  long nmsgs = stream->nmsgs;
  1.1061 +  long recent = stream->recent;
  1.1062 +  short added = NIL;
  1.1063 +  short silent = stream->silent;
  1.1064 +  fstat (LOCAL->fd,&sbuf);	/* get status */
  1.1065 +  if (sbuf.st_size < curpos) {	/* sanity check */
  1.1066 +    sprintf (tmp,"Mailbox shrank from %ld to %ld!",curpos,sbuf.st_size);
  1.1067 +    mm_log (tmp,ERROR);
  1.1068 +    tenex_close (stream,NIL);
  1.1069 +    return NIL;
  1.1070 +  }
  1.1071 +  stream->silent = T;		/* don't pass up mm_exists() events yet */
  1.1072 +  while (sbuf.st_size - curpos){/* while there is stuff to parse */
  1.1073 +				/* get to that position in the file */
  1.1074 +    lseek (LOCAL->fd,curpos,L_SET);
  1.1075 +    if ((i = read (LOCAL->fd,LOCAL->buf,64)) <= 0) {
  1.1076 +      sprintf (tmp,"Unable to read internal header at %lu, size = %lu: %s",
  1.1077 +	       (unsigned long) curpos,(unsigned long) sbuf.st_size,
  1.1078 +	       i ? strerror (errno) : "no data read");
  1.1079 +      mm_log (tmp,ERROR);
  1.1080 +      tenex_close (stream,NIL);
  1.1081 +      return NIL;
  1.1082 +    }
  1.1083 +    LOCAL->buf[i] = '\0';	/* tie off buffer just in case */
  1.1084 +    if (!(s = strchr (LOCAL->buf,'\012'))) {
  1.1085 +      sprintf (tmp,"Unable to find newline at %lu in %lu bytes, text: %s",
  1.1086 +	       (unsigned long) curpos,i,(char *) LOCAL->buf);
  1.1087 +      mm_log (tmp,ERROR);
  1.1088 +      tenex_close (stream,NIL);
  1.1089 +      return NIL;
  1.1090 +    }
  1.1091 +    *s = '\0';			/* tie off header line */
  1.1092 +    i = (s + 1) - LOCAL->buf;	/* note start of text offset */
  1.1093 +    if (!((s = strchr (LOCAL->buf,',')) && (t = strchr (s+1,';')))) {
  1.1094 +      sprintf (tmp,"Unable to parse internal header at %lu: %s",
  1.1095 +	       (unsigned long) curpos,(char *) LOCAL->buf);
  1.1096 +      mm_log (tmp,ERROR);
  1.1097 +      tenex_close (stream,NIL);
  1.1098 +      return NIL;
  1.1099 +    }
  1.1100 +    *s++ = '\0'; *t++ = '\0';	/* tie off fields */
  1.1101 +
  1.1102 +    added = T;			/* note that a new message was added */
  1.1103 +				/* swell the cache */
  1.1104 +    mail_exists (stream,++nmsgs);
  1.1105 +				/* instantiate an elt for this message */
  1.1106 +    (elt = mail_elt (stream,nmsgs))->valid = T;
  1.1107 +    elt->private.uid = ++stream->uid_last;
  1.1108 +				/* note file offset of header */
  1.1109 +    elt->private.special.offset = curpos;
  1.1110 +				/* in case error */
  1.1111 +    elt->private.special.text.size = 0;
  1.1112 +				/* header size not known yet */
  1.1113 +    elt->private.msg.header.text.size = 0;
  1.1114 +    x = s;			/* parse the header components */
  1.1115 +    if (mail_parse_date (elt,LOCAL->buf) &&
  1.1116 +	(elt->private.msg.full.text.size = strtoul (s,(char **) &s,10)) &&
  1.1117 +	(!(s && *s)) && isdigit (t[0]) && isdigit (t[1]) && isdigit (t[2]) &&
  1.1118 +	isdigit (t[3]) && isdigit (t[4]) && isdigit (t[5]) &&
  1.1119 +	isdigit (t[6]) && isdigit (t[7]) && isdigit (t[8]) &&
  1.1120 +	isdigit (t[9]) && isdigit (t[10]) && isdigit (t[11]) && !t[12])
  1.1121 +      elt->private.special.text.size = i;
  1.1122 +    else {			/* oops */
  1.1123 +      sprintf (tmp,"Unable to parse internal header elements at %ld: %s,%s;%s",
  1.1124 +	       curpos,(char *) LOCAL->buf,(char *) x,(char *) t);
  1.1125 +      mm_log (tmp,ERROR);
  1.1126 +      tenex_close (stream,NIL);
  1.1127 +      return NIL;
  1.1128 +    }
  1.1129 +				/* make sure didn't run off end of file */
  1.1130 +    if ((curpos += (elt->private.msg.full.text.size + i)) > sbuf.st_size) {
  1.1131 +      sprintf (tmp,"Last message (at %lu) runs past end of file (%lu > %lu)",
  1.1132 +	       elt->private.special.offset,(unsigned long) curpos,
  1.1133 +	       (unsigned long) sbuf.st_size);
  1.1134 +      mm_log (tmp,ERROR);
  1.1135 +      tenex_close (stream,NIL);
  1.1136 +      return NIL;
  1.1137 +    }
  1.1138 +    c = t[10];			/* remember first system flags byte */
  1.1139 +    t[10] = '\0';		/* tie off flags */
  1.1140 +    j = strtoul (t,NIL,8);	/* get user flags value */
  1.1141 +    t[10] = c;			/* restore first system flags byte */
  1.1142 +				/* set up all valid user flags (reversed!) */
  1.1143 +    while (j) if (((i = 29 - find_rightmost_bit (&j)) < NUSERFLAGS) &&
  1.1144 +		  stream->user_flags[i]) elt->user_flags |= 1 << i;
  1.1145 +				/* calculate system flags */
  1.1146 +    if ((j = ((t[10]-'0') * 8) + t[11]-'0') & fSEEN) elt->seen = T;
  1.1147 +    if (j & fDELETED) elt->deleted = T;
  1.1148 +    if (j & fFLAGGED) elt->flagged = T;
  1.1149 +    if (j & fANSWERED) elt->answered = T;
  1.1150 +    if (j & fDRAFT) elt->draft = T;
  1.1151 +    if (!(j & fOLD)) {		/* newly arrived message? */
  1.1152 +      elt->recent = T;
  1.1153 +      recent++;			/* count up a new recent message */
  1.1154 +				/* mark it as old */
  1.1155 +      tenex_update_status (stream,nmsgs,NIL);
  1.1156 +    }
  1.1157 +  }
  1.1158 +  fsync (LOCAL->fd);		/* make sure all the fOLD flags take */
  1.1159 +				/* update parsed file size and time */
  1.1160 +  LOCAL->filesize = sbuf.st_size;
  1.1161 +  fstat (LOCAL->fd,&sbuf);	/* get status again to ensure time is right */
  1.1162 +  LOCAL->filetime = sbuf.st_mtime;
  1.1163 +  if (added && !stream->rdonly){/* make sure atime updated */
  1.1164 +    struct utimbuf times;
  1.1165 +    times.actime = time (0);
  1.1166 +    times.modtime = LOCAL->filetime;
  1.1167 +    utime (stream->mailbox,&times);
  1.1168 +  }
  1.1169 +  stream->silent = silent;	/* can pass up events now */
  1.1170 +  mail_exists (stream,nmsgs);	/* notify upper level of new mailbox size */
  1.1171 +  mail_recent (stream,recent);	/* and of change in recent messages */
  1.1172 +  return LONGT;			/* return the winnage */
  1.1173 +}
  1.1174 +
  1.1175 +/* Tenex get cache element with status updating from file
  1.1176 + * Accepts: MAIL stream
  1.1177 + *	    message number
  1.1178 + * Returns: cache element
  1.1179 + */
  1.1180 +
  1.1181 +MESSAGECACHE *tenex_elt (MAILSTREAM *stream,unsigned long msgno)
  1.1182 +{
  1.1183 +  MESSAGECACHE *elt = mail_elt (stream,msgno);
  1.1184 +  struct {			/* old flags */
  1.1185 +    unsigned int seen : 1;
  1.1186 +    unsigned int deleted : 1;
  1.1187 +    unsigned int flagged : 1;
  1.1188 +    unsigned int answered : 1;
  1.1189 +    unsigned int draft : 1;
  1.1190 +    unsigned long user_flags;
  1.1191 +  } old;
  1.1192 +  old.seen = elt->seen; old.deleted = elt->deleted; old.flagged = elt->flagged;
  1.1193 +  old.answered = elt->answered; old.draft = elt->draft;
  1.1194 +  old.user_flags = elt->user_flags;
  1.1195 +  tenex_read_flags (stream,elt);
  1.1196 +  if ((old.seen != elt->seen) || (old.deleted != elt->deleted) ||
  1.1197 +      (old.flagged != elt->flagged) || (old.answered != elt->answered) ||
  1.1198 +      (old.draft != elt->draft) || (old.user_flags != elt->user_flags))
  1.1199 +    mm_flags (stream,msgno);	/* let top level know */
  1.1200 +  return elt;
  1.1201 +}
  1.1202 +
  1.1203 +
  1.1204 +/* Tenex read flags from file
  1.1205 + * Accepts: MAIL stream
  1.1206 + * Returns: cache element
  1.1207 + */
  1.1208 +
  1.1209 +void tenex_read_flags (MAILSTREAM *stream,MESSAGECACHE *elt)
  1.1210 +{
  1.1211 +  unsigned long i,j;
  1.1212 +				/* noop if readonly and have valid flags */
  1.1213 +  if (stream->rdonly && elt->valid) return;
  1.1214 +				/* set the seek pointer */
  1.1215 +  lseek (LOCAL->fd,(off_t) elt->private.special.offset +
  1.1216 +	 elt->private.special.text.size - 13,L_SET);
  1.1217 +				/* read the new flags */
  1.1218 +  if (read (LOCAL->fd,LOCAL->buf,12) < 0) {
  1.1219 +    sprintf (LOCAL->buf,"Unable to read new status: %s",strerror (errno));
  1.1220 +    fatal (LOCAL->buf);
  1.1221 +  }
  1.1222 +				/* calculate system flags */
  1.1223 +  i = (((LOCAL->buf[10]-'0') * 8) + LOCAL->buf[11]-'0');
  1.1224 +  elt->seen = i & fSEEN ? T : NIL; elt->deleted = i & fDELETED ? T : NIL;
  1.1225 +  elt->flagged = i & fFLAGGED ? T : NIL;
  1.1226 +  elt->answered = i & fANSWERED ? T : NIL; elt->draft = i & fDRAFT ? T : NIL;
  1.1227 +  LOCAL->buf[10] = '\0';	/* tie off flags */
  1.1228 +  j = strtoul(LOCAL->buf,NIL,8);/* get user flags value */
  1.1229 +				/* set up all valid user flags (reversed!) */
  1.1230 +  while (j) if (((i = 29 - find_rightmost_bit (&j)) < NUSERFLAGS) &&
  1.1231 +		stream->user_flags[i]) elt->user_flags |= 1 << i;
  1.1232 +  elt->valid = T;		/* have valid flags now */
  1.1233 +}
  1.1234 +
  1.1235 +/* Tenex update status string
  1.1236 + * Accepts: MAIL stream
  1.1237 + *	    message number
  1.1238 + *	    flag saying whether or not to sync
  1.1239 + */
  1.1240 +
  1.1241 +void tenex_update_status (MAILSTREAM *stream,unsigned long msgno,long syncflag)
  1.1242 +{
  1.1243 +  struct utimbuf times;
  1.1244 +  struct stat sbuf;
  1.1245 +  MESSAGECACHE *elt = mail_elt (stream,msgno);
  1.1246 +  unsigned long j,k = 0;
  1.1247 +				/* readonly */
  1.1248 +  if (stream->rdonly || !elt->valid) tenex_read_flags (stream,elt);
  1.1249 +  else {			/* readwrite */
  1.1250 +    j = elt->user_flags;	/* get user flags */
  1.1251 +				/* reverse bits (dontcha wish we had CIRC?) */
  1.1252 +    while (j) k |= 1 << (29 - find_rightmost_bit (&j));
  1.1253 +				/* print new flag string */
  1.1254 +    sprintf (LOCAL->buf,"%010lo%02o",k,(unsigned)
  1.1255 +	     (fOLD + (fSEEN * elt->seen) + (fDELETED * elt->deleted) +
  1.1256 +	      (fFLAGGED * elt->flagged) + (fANSWERED * elt->answered) +
  1.1257 +	      (fDRAFT * elt->draft)));
  1.1258 +    while (T) {			/* get to that place in the file */
  1.1259 +      lseek (LOCAL->fd,(off_t) elt->private.special.offset +
  1.1260 +	     elt->private.special.text.size - 13,L_SET);
  1.1261 +				/* write new flags */
  1.1262 +      if (write (LOCAL->fd,LOCAL->buf,12) > 0) break;
  1.1263 +      mm_notify (stream,strerror (errno),WARN);
  1.1264 +      mm_diskerror (stream,errno,T);
  1.1265 +    }
  1.1266 +    if (syncflag) {		/* sync if requested */
  1.1267 +      fsync (LOCAL->fd);
  1.1268 +      fstat (LOCAL->fd,&sbuf);	/* get new write time */
  1.1269 +      times.modtime = LOCAL->filetime = sbuf.st_mtime;
  1.1270 +      times.actime = time (0);	/* make sure read is later */
  1.1271 +      utime (stream->mailbox,&times);
  1.1272 +    }
  1.1273 +  }
  1.1274 +}
  1.1275 +
  1.1276 +/* Tenex locate header for a message
  1.1277 + * Accepts: MAIL stream
  1.1278 + *	    message number
  1.1279 + *	    pointer to returned header size
  1.1280 + * Returns: position of header in file
  1.1281 + */
  1.1282 +
  1.1283 +unsigned long tenex_hdrpos (MAILSTREAM *stream,unsigned long msgno,
  1.1284 +			    unsigned long *size)
  1.1285 +{
  1.1286 +  unsigned long siz;
  1.1287 +  long i = 0;
  1.1288 +  char c = '\0';
  1.1289 +  char *s = NIL;
  1.1290 +  MESSAGECACHE *elt = tenex_elt (stream,msgno);
  1.1291 +  unsigned long ret = elt->private.special.offset +
  1.1292 +    elt->private.special.text.size;
  1.1293 +  unsigned long msiz = tenex_size (stream,msgno);
  1.1294 +				/* is header size known? */
  1.1295 +  if (!(*size = elt->private.msg.header.text.size)) {
  1.1296 +    lseek (LOCAL->fd,ret,L_SET);/* get to header position */
  1.1297 +				/* search message for LF LF */
  1.1298 +    for (siz = 0; siz < msiz; siz++) {
  1.1299 +      if (--i <= 0)		/* read another buffer as necessary */
  1.1300 +	read (LOCAL->fd,s = LOCAL->buf,i = min (msiz-siz,(long) MAILTMPLEN));
  1.1301 +				/* two newline sequence? */
  1.1302 +      if ((c == '\012') && (*s == '\012')) {
  1.1303 +				/* yes, note for later */
  1.1304 +	elt->private.msg.header.text.size = (*size = siz + 1);
  1.1305 +	return ret;		/* return to caller */
  1.1306 +      }
  1.1307 +      else c = *s++;		/* next character */
  1.1308 +    }
  1.1309 +				/* header consumes entire message */
  1.1310 +    elt->private.msg.header.text.size = *size = msiz;
  1.1311 +  }
  1.1312 +  return ret;
  1.1313 +}