www.pudn.com > sip-1[1].5.0.part02.rar > mmdf.c
/*
* Program: MMDF mail routines
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 20 December 1989
* Last Edited: 1 September 2000
*
* Copyright 2000 by the University of Washington
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appears in all copies and that both the
* above copyright notice and this permission notice appear in supporting
* documentation, and that the name of the University of Washington not be
* used in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. This software is made
* available "as is", and
* THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
* WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
* NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
* (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include
#include
#include
extern int errno; /* just in case */
#include
#include "mail.h"
#include "osdep.h"
#include
#include
#include "mmdf.h"
#include "pseudo.h"
#include "fdstring.h"
#include "misc.h"
#include "dummy.h"
/* MMDF mail routines */
/* Driver dispatch used by MAIL */
DRIVER mmdfdriver = {
"mmdf", /* driver name */
DR_LOCAL|DR_MAIL, /* driver flags */
(DRIVER *) NIL, /* next driver */
mmdf_valid, /* mailbox is valid for us */
mmdf_parameters, /* manipulate parameters */
mmdf_scan, /* scan mailboxes */
mmdf_list, /* list mailboxes */
mmdf_lsub, /* list subscribed mailboxes */
NIL, /* subscribe to mailbox */
NIL, /* unsubscribe from mailbox */
mmdf_create, /* create mailbox */
mmdf_delete, /* delete mailbox */
mmdf_rename, /* rename mailbox */
NIL, /* status of mailbox */
mmdf_open, /* open mailbox */
mmdf_close, /* close mailbox */
NIL, /* fetch message "fast" attributes */
NIL, /* fetch message flags */
NIL, /* fetch overview */
NIL, /* fetch message envelopes */
mmdf_header, /* fetch message header */
mmdf_text, /* fetch message text */
NIL, /* fetch partial message text */
NIL, /* unique identifier */
NIL, /* message number */
NIL, /* modify flags */
mmdf_flagmsg, /* per-message modify flags */
NIL, /* search for message based on criteria */
NIL, /* sort messages */
NIL, /* thread messages */
mmdf_ping, /* ping mailbox to see if still alive */
mmdf_check, /* check for new messages */
mmdf_expunge, /* expunge deleted messages */
mmdf_copy, /* copy messages to another mailbox */
mmdf_append, /* append string message to mailbox */
NIL /* garbage collect stream */
};
/* prototype stream */
MAILSTREAM mmdfproto = {&mmdfdriver};
char *mmdfhdr = MMDFHDRTXT; /* MMDF header */
/* MMDF mail validate mailbox
* Accepts: mailbox name
* Returns: our driver if name is valid, NIL otherwise
*/
DRIVER *mmdf_valid (char *name)
{
char tmp[MAILTMPLEN];
return mmdf_isvalid (name,tmp) ? &mmdfdriver : NIL;
}
/* MMDF mail test for valid mailbox name
* Accepts: mailbox name
* scratch buffer
* Returns: T if valid, NIL otherwise
*/
long mmdf_isvalid (char *name,char *tmp)
{
int fd;
int ret = NIL;
char *t,file[MAILTMPLEN];
struct stat sbuf;
time_t tp[2];
errno = EINVAL; /* assume invalid argument */
/* must be non-empty file */
if ((t = dummy_file (file,name)) && !stat (t,&sbuf)) {
if (!sbuf.st_size)errno = 0;/* empty file */
else if ((fd = open (file,O_RDONLY,NIL)) >= 0) {
/* error -1 for invalid format */
if (!(ret = mmdf_isvalid_fd (fd,tmp))) errno = -1;
close (fd); /* close the file */
tp[0] = sbuf.st_atime; /* preserve atime and mtime */
tp[1] = sbuf.st_mtime;
utime (file,tp); /* set the times */
}
}
/* in case INBOX but not MMDF format */
else if ((errno == ENOENT) && ((name[0] == 'I') || (name[0] == 'i')) &&
((name[1] == 'N') || (name[1] == 'n')) &&
((name[2] == 'B') || (name[2] == 'b')) &&
((name[3] == 'O') || (name[3] == 'o')) &&
((name[4] == 'X') || (name[4] == 'x')) && !name[5]) errno = -1;
return ret; /* return what we should */
}
/* MMDF mail test for valid mailbox
* Accepts: file descriptor
* scratch buffer
* Returns: T if valid, NIL otherwise
*/
long mmdf_isvalid_fd (int fd,char *tmp)
{
int ret = NIL;
memset (tmp,'\0',MAILTMPLEN);
if (read (fd,tmp,MAILTMPLEN-1) >= 0) ret = ISMMDF (tmp) ? T : NIL;
return ret; /* return what we should */
}
/* MMDF manipulate driver parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *mmdf_parameters (long function,void *value)
{
return NIL;
}
/* MMDF mail scan mailboxes
* Accepts: mail stream
* reference
* pattern to search
* string to scan
*/
void mmdf_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
{
if (stream) dummy_scan (NIL,ref,pat,contents);
}
/* MMDF mail list mailboxes
* Accepts: mail stream
* reference
* pattern to search
*/
void mmdf_list (MAILSTREAM *stream,char *ref,char *pat)
{
if (stream) dummy_list (NIL,ref,pat);
}
/* MMDF mail list subscribed mailboxes
* Accepts: mail stream
* reference
* pattern to search
*/
void mmdf_lsub (MAILSTREAM *stream,char *ref,char *pat)
{
if (stream) dummy_lsub (NIL,ref,pat);
}
/* MMDF mail create mailbox
* Accepts: MAIL stream
* mailbox name to create
* Returns: T on success, NIL on failure
*/
long mmdf_create (MAILSTREAM *stream,char *mailbox)
{
char *s,mbx[MAILTMPLEN],tmp[MAILTMPLEN];
long ret = NIL;
int i,fd;
time_t ti = time (0);
if (!(s = dummy_file (mbx,mailbox))) {
sprintf (tmp,"Can't create %.80s: invalid name",mailbox);
mm_log (tmp,ERROR);
}
/* create underlying file */
else if (dummy_create_path (stream,s)) {
/* done if made directory */
if ((s = strrchr (s,'/')) && !s[1]) return T;
if ((fd = open (mbx,O_WRONLY,
(int) mail_parameters (NIL,GET_MBXPROTECTION,NIL))) < 0) {
sprintf (tmp,"Can't reopen mailbox node %.80s: %s",mbx,strerror (errno));
mm_log (tmp,ERROR);
unlink (mbx); /* delete the file */
}
/* in case a whiner with no life */
else if (mail_parameters (NIL,GET_USERHASNOLIFE,NIL)) ret = T;
else { /* initialize header */
memset (tmp,'\0',MAILTMPLEN);
sprintf (tmp,"%sFrom %s %sDate: ",mmdfhdr,pseudo_from,ctime (&ti));
rfc822_date (s = tmp + strlen (tmp));
sprintf (s += strlen (s), /* write the pseudo-header */
"\nFrom: %s <%s@%s>\nSubject: %s\nX-IMAP: %010lu 0000000000",
pseudo_name,pseudo_from,mylocalhost (),pseudo_subject,
(unsigned long) ti);
for (i = 0; i < NUSERFLAGS; ++i) if (default_user_flag (i))
sprintf (s += strlen (s)," %s",default_user_flag (i));
sprintf (s += strlen (s),"\nStatus: RO\n\n%s\n%s",pseudo_msg,mmdfhdr);
if ((write (fd,tmp,strlen (tmp)) < 0) || close (fd)) {
sprintf (tmp,"Can't initialize mailbox node %.80s: %s",mbx,
strerror (errno));
mm_log (tmp,ERROR);
unlink (mbx); /* delete the file */
}
else ret = T; /* success */
}
close (fd); /* close file, set proper protections */
}
return ret ? set_mbx_protections (mailbox,mbx) : NIL;
}
/* MMDF mail delete mailbox
* Accepts: MAIL stream
* mailbox name to delete
* Returns: T on success, NIL on failure
*/
long mmdf_delete (MAILSTREAM *stream,char *mailbox)
{
return mmdf_rename (stream,mailbox,NIL);
}
/* MMDF mail rename mailbox
* Accepts: MAIL stream
* old mailbox name
* new mailbox name (or NIL for delete)
* Returns: T on success, NIL on failure
*/
long mmdf_rename (MAILSTREAM *stream,char *old,char *newname)
{
long ret = NIL;
char c,*s = NIL;
char tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN];
DOTLOCK lockx;
int fd,ld;
long i;
struct stat sbuf;
mm_critical (stream); /* get the c-client lock */
if (newname && !((s = dummy_file (tmp,newname)) && *s))
sprintf (tmp,"Can't rename mailbox %.80s to %.80s: invalid name",
old,newname);
/* lock out other c-clients */
else if ((ld = lockname (lock,dummy_file (file,old),LOCK_EX|LOCK_NB,&i)) < 0)
sprintf (tmp,"Mailbox %.80s is in use by another process",old);
else {
if ((fd = mmdf_lock (file,O_RDWR,S_IREAD|S_IWRITE,&lockx,LOCK_EX)) < 0)
sprintf (tmp,"Can't lock mailbox %.80s: %s",old,strerror (errno));
else {
if (newname) { /* want rename? */
/* found superior to destination name? */
if (s = strrchr (s,'/')) {
c = *++s; /* remember first character of inferior */
*s = '\0'; /* tie off to get just superior */
/* name doesn't exist, create it */
if ((stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) &&
!dummy_create (stream,tmp)) {
mmdf_unlock (fd,NIL,&lockx);
mmdf_unlock (ld,NIL,NIL);
unlink (lock);
mm_nocritical (stream);
return ret; /* return success or failure */
}
*s = c; /* restore full name */
}
if (rename (file,tmp))
sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",old,newname,
strerror (errno));
else ret = T; /* set success */
}
else if (unlink (file))
sprintf (tmp,"Can't delete mailbox %.80s: %s",old,strerror (errno));
else ret = T; /* set success */
mmdf_unlock (fd,NIL,&lockx);
}
mmdf_unlock (ld,NIL,NIL); /* flush the lock */
unlink (lock);
}
mm_nocritical (stream); /* no longer critical */
if (!ret) mm_log (tmp,ERROR); /* log error */
return ret; /* return success or failure */
}
/* MMDF mail open
* Accepts: Stream to open
* Returns: Stream on success, NIL on failure
*/
MAILSTREAM *mmdf_open (MAILSTREAM *stream)
{
long i;
int fd;
char tmp[MAILTMPLEN];
DOTLOCK lock;
long retry;
/* return prototype for OP_PROTOTYPE call */
if (!stream) return user_flags (&mmdfproto);
retry = stream->silent ? 1 : KODRETRY;
if (stream->local) fatal ("mmdf recycle stream");
stream->local = memset (fs_get (sizeof (MMDFLOCAL)),0,sizeof (MMDFLOCAL));
/* note if an INBOX or not */
stream->inbox = !strcmp (ucase (strcpy (tmp,stream->mailbox)),"INBOX");
/* canonicalize the stream mailbox name */
dummy_file (tmp,stream->mailbox);
/* flush old name */
fs_give ((void **) &stream->mailbox);
/* save canonical name */
stream->mailbox = cpystr (tmp);
LOCAL->fd = LOCAL->ld = -1; /* no file or state locking yet */
LOCAL->buf = (char *) fs_get ((LOCAL->buflen = CHUNK) + 1);
stream->sequence++; /* bump sequence number */
/* make lock for read/write access */
if (!stream->rdonly) while (retry) {
/* try to lock file */
if ((fd = lockname (tmp,stream->mailbox,LOCK_EX|LOCK_NB,&i)) < 0) {
if (retry-- == KODRETRY) {/* no, first time through? */
if (i) { /* learned the other guy's PID? */
kill ((int) i,SIGUSR2);
sprintf (tmp,"Trying to get mailbox lock from process %ld",i);
mm_log (tmp,WARN);
}
else retry = 0; /* give up */
}
if (!stream->silent) { /* nothing if silent stream */
if (retry) sleep (1); /* wait a second before trying again */
else mm_log ("Mailbox is open by another process, access is readonly",
WARN);
}
}
else { /* got the lock, nobody else can alter state */
LOCAL->ld = fd; /* note lock's fd and name */
LOCAL->lname = cpystr (tmp);
/* make sure mode OK (don't use fchmod()) */
chmod (LOCAL->lname,(int) mail_parameters (NIL,GET_LOCKPROTECTION,NIL));
if (stream->silent) i = 0;/* silent streams won't accept KOD */
else { /* note our PID in the lock */
sprintf (tmp,"%d",getpid ());
write (fd,tmp,(i = strlen (tmp))+1);
}
ftruncate (fd,i); /* make sure tied off */
fsync (fd); /* make sure it's available */
retry = 0; /* no more need to try */
}
}
/* parse mailbox */
stream->nmsgs = stream->recent = 0;
/* will we be able to get write access? */
if ((LOCAL->ld >= 0) && access (stream->mailbox,W_OK) && (errno == EACCES)) {
mm_log ("Can't get write access to mailbox, access is readonly",WARN);
flock (LOCAL->ld,LOCK_UN); /* release the lock */
close (LOCAL->ld); /* close the lock file */
LOCAL->ld = -1; /* no more lock fd */
unlink (LOCAL->lname); /* delete it */
}
/* reset UID validity */
stream->uid_validity = stream->uid_last = 0;
if (stream->silent && !stream->rdonly && (LOCAL->ld < 0))
mmdf_abort (stream); /* abort if can't get RW silent stream */
/* parse mailbox */
else if (mmdf_parse (stream,&lock,LOCK_SH)) {
mmdf_unlock (LOCAL->fd,stream,&lock);
mail_unlock (stream);
mm_nocritical (stream); /* done with critical */
}
if (!LOCAL) return NIL; /* failure if stream died */
/* make sure upper level knows readonly */
stream->rdonly = (LOCAL->ld < 0);
/* notify about empty mailbox */
if (!(stream->nmsgs || stream->silent)) mm_log ("Mailbox is empty",NIL);
if (!stream->rdonly) { /* flags stick if readwrite */
stream->perm_seen = stream->perm_deleted =
stream->perm_flagged = stream->perm_answered = stream->perm_draft = T;
if (!stream->uid_nosticky) {/* users with lives get permanent keywords */
stream->perm_user_flags = 0xffffffff;
/* and maybe can create them too! */
stream->kwd_create = stream->user_flags[NUSERFLAGS-1] ? NIL : T;
}
}
return stream; /* return stream alive to caller */
}
/* MMDF mail close
* Accepts: MAIL stream
* close options
*/
void mmdf_close (MAILSTREAM *stream,long options)
{
int silent = stream->silent;
stream->silent = T; /* go silent */
/* expunge if requested */
if (options & CL_EXPUNGE) mmdf_expunge (stream);
/* else dump final checkpoint */
else if (LOCAL->dirty) mmdf_check (stream);
stream->silent = silent; /* restore old silence state */
mmdf_abort (stream); /* now punt the file and local data */
}
/* MMDF mail fetch message header
* Accepts: MAIL stream
* message # to fetch
* pointer to returned header text length
* option flags
* Returns: message header in RFC822 format
*/
/* lines to filter from header */
static STRINGLIST *mmdf_hlines = NIL;
char *mmdf_header (MAILSTREAM *stream,unsigned long msgno,
unsigned long *length,long flags)
{
MESSAGECACHE *elt;
char *s;
*length = 0; /* default to empty */
if (flags & FT_UID) return "";/* UID call "impossible" */
elt = mail_elt (stream,msgno);/* get cache */
if (!mmdf_hlines) { /* once only code */
STRINGLIST *lines = mmdf_hlines = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "Status"));
lines = lines->next = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "X-Status"));
lines = lines->next = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "X-Keywords"));
lines = lines->next = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "X-UID"));
lines = lines->next = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "X-IMAP"));
lines = lines->next = mail_newstringlist ();
lines->text.size = strlen ((char *) (lines->text.data =
(unsigned char *) "X-IMAPbase"));
}
/* go to header position */
lseek (LOCAL->fd,elt->private.special.offset +
elt->private.msg.header.offset,L_SET);
if (flags & FT_INTERNAL) { /* initial data OK? */
if (elt->private.msg.header.text.size > LOCAL->buflen) {
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen =
elt->private.msg.header.text.size) + 1);
}
/* read message */
read (LOCAL->fd,LOCAL->buf,elt->private.msg.header.text.size);
/* got text, tie off string */
LOCAL->buf[*length = elt->private.msg.header.text.size] = '\0';
/* squeeze out CRs (in case from PC) */
if (s = strchr (LOCAL->buf,'\r')) {
char *t,*tl;
for (t = s,tl = LOCAL->buf + *length; t <= tl; t++)
if ((*t != '\r') || (t[1] != '\n')) *s++ = *t;
/* adjust length */
LOCAL->buf[*length = s - LOCAL->buf - 1] = '\0';
}
}
else { /* need to make a CRLF version */
read (LOCAL->fd,s = (char *) fs_get (elt->private.msg.header.text.size+1),
elt->private.msg.header.text.size);
/* tie off string, and convert to CRLF */
s[elt->private.msg.header.text.size] = '\0';
*length = strcrlfcpy (&LOCAL->buf,&LOCAL->buflen,s,
elt->private.msg.header.text.size);
fs_give ((void **) &s); /* free readin buffer */
}
*length = mail_filter (LOCAL->buf,*length,mmdf_hlines,FT_NOT);
return LOCAL->buf; /* return processed copy */
}
/* MMDF mail fetch message text
* Accepts: MAIL stream
* message # to fetch
* pointer to returned stringstruct
* option flags
* Returns: T on success, NIL if failure
*/
long mmdf_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
char *s;
unsigned long i;
MESSAGECACHE *elt;
/* UID call "impossible" */
if (flags & FT_UID) return NIL;
elt = mail_elt (stream,msgno);/* get cache element */
/* if message not seen */
if (!(flags & FT_PEEK) && !elt->seen) {
/* mark message seen and dirty */
elt->seen = elt->private.dirty = LOCAL->dirty = T;
mm_flags (stream,msgno);
}
s = mmdf_text_work (stream,elt,&i,flags);
INIT (bs,mail_string,s,i); /* set up stringstruct */
return T; /* success */
}
/* MMDF mail fetch message text worker routine
* Accepts: MAIL stream
* message cache element
* pointer to returned header text length
* option flags
*/
char *mmdf_text_work (MAILSTREAM *stream,MESSAGECACHE *elt,
unsigned long *length,long flags)
{
FDDATA d;
STRING bs;
char *s,tmp[CHUNK];
/* go to text position */
lseek (LOCAL->fd,elt->private.special.offset +
elt->private.msg.text.offset,L_SET);
if (flags & FT_INTERNAL) { /* initial data OK? */
if (elt->private.msg.text.text.size > LOCAL->buflen) {
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen =
elt->private.msg.text.text.size) + 1);
}
/* read message */
read (LOCAL->fd,LOCAL->buf,elt->private.msg.text.text.size);
/* got text, tie off string */
LOCAL->buf[*length = elt->private.msg.text.text.size] = '\0';
/* squeeze out CRs (in case from PC) */
if (s = strchr (LOCAL->buf,'\r')) {
char *t,*tl;
for (t = s,tl = LOCAL->buf + *length; t <= tl; t++)
if ((*t != '\r') || (t[1] != '\n')) *s++ = *t;
/* adjust length */
*length = s - LOCAL->buf - 1;
}
}
else { /* need to make a CRLF version */
if (elt->rfc822_size > LOCAL->buflen) {
/* excessively conservative, but the right thing is too hard to do */
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen = elt->rfc822_size) + 1);
}
d.fd = LOCAL->fd; /* yes, set up file descriptor */
d.pos = elt->private.special.offset + elt->private.msg.text.offset;
d.chunk = tmp; /* initial buffer chunk */
d.chunksize = CHUNK; /* file chunk size */
INIT (&bs,fd_string,&d,elt->private.msg.text.text.size);
for (s = LOCAL->buf; SIZE (&bs);) switch (CHR (&bs)) {
case '\r': /* carriage return seen */
*s++ = SNX (&bs); /* copy it and any succeeding LF */
if (SIZE (&bs) && (CHR (&bs) == '\n')) *s++ = SNX (&bs);
break;
case '\n':
*s++ = '\r'; /* insert a CR */
default:
*s++ = SNX (&bs); /* copy characters */
}
*s = '\0'; /* tie off buffer */
*length = s - LOCAL->buf; /* calculate length */
}
return LOCAL->buf;
}
/* MMDF per-message modify flag
* Accepts: MAIL stream
* message cache element
*/
void mmdf_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
{
/* only after finishing */
if (elt->valid) elt->private.dirty = LOCAL->dirty = T;
}
/* MMDF mail ping mailbox
* Accepts: MAIL stream
* Returns: T if stream alive, else NIL
*/
long mmdf_ping (MAILSTREAM *stream)
{
DOTLOCK lock;
struct stat sbuf;
/* big no-op if not readwrite */
if (LOCAL && (LOCAL->ld >= 0) && !stream->lock) {
if (stream->rdonly) { /* does he want to give up readwrite? */
/* checkpoint if we changed something */
if (LOCAL->dirty) mmdf_check (stream);
flock (LOCAL->ld,LOCK_UN);/* release readwrite lock */
close (LOCAL->ld); /* close the readwrite lock file */
LOCAL->ld = -1; /* no more readwrite lock fd */
unlink (LOCAL->lname); /* delete the readwrite lock file */
}
else { /* get current mailbox size */
if (LOCAL->fd >= 0) fstat (LOCAL->fd,&sbuf);
else stat (stream->mailbox,&sbuf);
/* parse if mailbox changed */
if ((sbuf.st_size != LOCAL->filesize) &&
mmdf_parse (stream,&lock,LOCK_SH)) {
/* unlock mailbox */
mmdf_unlock (LOCAL->fd,stream,&lock);
mail_unlock (stream); /* and stream */
mm_nocritical (stream); /* done with critical */
}
}
}
return LOCAL ? LONGT : NIL; /* return if still alive */
}
/* MMDF mail check mailbox
* Accepts: MAIL stream
*/
void mmdf_check (MAILSTREAM *stream)
{
DOTLOCK lock;
/* parse and lock mailbox */
if (LOCAL && (LOCAL->ld >= 0) && !stream->lock &&
mmdf_parse (stream,&lock,LOCK_EX)) {
/* any unsaved changes? */
if (LOCAL->dirty && mmdf_rewrite (stream,NIL,&lock)) {
if (!stream->silent) mm_log ("Checkpoint completed",NIL);
}
/* no checkpoint needed, just unlock */
else mmdf_unlock (LOCAL->fd,stream,&lock);
mail_unlock (stream); /* unlock the stream */
mm_nocritical (stream); /* done with critical */
}
}
/* MMDF mail expunge mailbox
* Accepts: MAIL stream
*/
void mmdf_expunge (MAILSTREAM *stream)
{
unsigned long i;
DOTLOCK lock;
char *msg = NIL;
/* parse and lock mailbox */
if (LOCAL && (LOCAL->ld >= 0) && !stream->lock &&
mmdf_parse (stream,&lock,LOCK_EX)) {
/* count expunged messages if not dirty */
if (!LOCAL->dirty) for (i = 1; i <= stream->nmsgs; i++)
if (mail_elt (stream,i)->deleted) LOCAL->dirty = T;
if (!LOCAL->dirty) { /* not dirty and no expunged messages */
mmdf_unlock (LOCAL->fd,stream,&lock);
msg = "No messages deleted, so no update needed";
}
else if (mmdf_rewrite (stream,&i,&lock)) {
if (i) sprintf (msg = LOCAL->buf,"Expunged %lu messages",i);
else msg = "Mailbox checkpointed, but no messages expunged";
}
/* rewrite failed */
else mmdf_unlock (LOCAL->fd,stream,&lock);
mail_unlock (stream); /* unlock the stream */
mm_nocritical (stream); /* done with critical */
if (msg && !stream->silent) mm_log (msg,NIL);
}
else if (!stream->silent) mm_log("Expunge ignored on readonly mailbox",WARN);
}
/* MMDF mail copy message(s)
* Accepts: MAIL stream
* sequence
* destination mailbox
* copy options
* Returns: T if copy successful, else NIL
*/
long mmdf_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
struct stat sbuf;
int fd;
char *s,file[MAILTMPLEN];
DOTLOCK lock;
time_t tp[2];
unsigned long i,j;
MESSAGECACHE *elt;
long ret = T;
mailproxycopy_t pc =
(mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence))) return NIL;
/* make sure valid mailbox */
if (!mmdf_isvalid (mailbox,file)) switch (errno) {
case ENOENT: /* no such file? */
mm_notify (stream,"[TRYCREATE] Must create mailbox before copy",NIL);
return NIL;
case 0: /* merely empty file? */
break;
case EINVAL:
if (pc) return (*pc) (stream,sequence,mailbox,options);
sprintf (LOCAL->buf,"Invalid MMDF-format mailbox name: %.80s",mailbox);
mm_log (LOCAL->buf,ERROR);
return NIL;
default:
if (pc) return (*pc) (stream,sequence,mailbox,options);
sprintf (LOCAL->buf,"Not a MMDF-format mailbox: %.80s",mailbox);
mm_log (LOCAL->buf,ERROR);
return NIL;
}
LOCAL->buf[0] = '\0';
mm_critical (stream); /* go critical */
if ((fd = mmdf_lock (dummy_file (file,mailbox),O_WRONLY|O_APPEND|O_CREAT,
S_IREAD|S_IWRITE,&lock,LOCK_EX)) < 0) {
mm_nocritical (stream); /* done with critical */
sprintf (LOCAL->buf,"Can't open destination mailbox: %s",strerror (errno));
mm_log (LOCAL->buf,ERROR); /* log the error */
return NIL; /* failed */
}
fstat (fd,&sbuf); /* get current file size */
/* write all requested messages to mailbox */
for (i = 1; ret && (i <= stream->nmsgs); i++)
if ((elt = mail_elt (stream,i))->sequence) {
lseek (LOCAL->fd,elt->private.special.offset,L_SET);
read (LOCAL->fd,LOCAL->buf,elt->private.special.text.size);
if (write (fd,LOCAL->buf,elt->private.special.text.size) < 0) ret = NIL;
else { /* internal header succeeded */
s = mmdf_header (stream,i,&j,FT_INTERNAL);
/* header size, sans trailing newline */
if (j && (s[j - 2] == '\n')) j--;
if (write (fd,s,j) < 0) ret = NIL;
else { /* message header succeeded */
j = mmdf_xstatus (stream,LOCAL->buf,elt,NIL);
if (write (fd,LOCAL->buf,j) < 0) ret = NIL;
else { /* message status succeeded */
s = mmdf_text_work (stream,elt,&j,FT_INTERNAL);
if ((write (fd,s,j) < 0) || (write (fd,mmdfhdr,MMDFHDRLEN) < 0))
ret = NIL;
}
}
}
}
if (!ret || fsync (fd)) { /* force out the update */
sprintf (LOCAL->buf,"Message copy failed: %s",strerror (errno));
ftruncate (fd,sbuf.st_size);
ret = NIL;
}
tp[0] = sbuf.st_atime; /* preserve atime */
tp[1] = time (0); /* set mtime to now */
utime (file,tp); /* set the times */
mmdf_unlock (fd,NIL,&lock); /* unlock and close mailbox */
mm_nocritical (stream); /* release critical */
/* log the error */
if (!ret) mm_log (LOCAL->buf,ERROR);
/* delete if requested message */
else if (options & CP_MOVE) for (i = 1; i <= stream->nmsgs; i++)
if ((elt = mail_elt (stream,i))->sequence)
elt->deleted = elt->private.dirty = LOCAL->dirty = T;
return ret;
}
/* MMDF mail append message from stringstruct
* Accepts: MAIL stream
* destination mailbox
* append callback
* data for callback
* Returns: T if append successful, else NIL
*/
#define BUFLEN 8*MAILTMPLEN
long mmdf_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
{
struct stat sbuf;
int fd;
unsigned long i,j;
char *flags,*date,buf[BUFLEN],tmp[MAILTMPLEN],file[MAILTMPLEN];
time_t tp[2];
FILE *sf,*df;
MESSAGECACHE elt;
DOTLOCK lock;
STRING *message;
long ret = LONGT;
/* default stream to prototype */
if (!stream) stream = user_flags (&mmdfproto);
/* make sure valid mailbox */
if (!mmdf_valid (mailbox)) switch (errno) {
case ENOENT: /* no such file? */
if (((mailbox[0] == 'I') || (mailbox[0] == 'i')) &&
((mailbox[1] == 'N') || (mailbox[1] == 'n')) &&
((mailbox[2] == 'B') || (mailbox[2] == 'b')) &&
((mailbox[3] == 'O') || (mailbox[3] == 'o')) &&
((mailbox[4] == 'X') || (mailbox[4] == 'x')) && !mailbox[5])
mmdf_create (NIL,"INBOX");
else {
mm_notify (stream,"[TRYCREATE] Must create mailbox before append",NIL);
return NIL;
}
/* falls through */
case 0: /* INBOX ENOENT or empty file? */
break;
case EINVAL:
sprintf (tmp,"Invalid MMDF-format mailbox name: %.80s",mailbox);
mm_log (tmp,ERROR);
return NIL;
default:
sprintf (tmp,"Not a MMDF-format mailbox: %.80s",mailbox);
mm_log (tmp,ERROR);
return NIL;
}
/* get first message */
if (!(*af) (stream,data,&flags,&date,&message)) return NIL;
if (!(sf = tmpfile ())) { /* must have scratch file */
sprintf (tmp,"Unable to create scratch file: %.80s",strerror (errno));
mm_log (tmp,ERROR);
}
do { /* parse date */
if (!date) rfc822_date (date = tmp);
if (!mail_parse_date (&elt,date)) {
sprintf (tmp,"Bad date in append: %.80s",date);
mm_log (tmp,ERROR);
}
else { /* user wants to suppress time zones? */
if (mail_parameters (NIL,GET_NOTIMEZONES,NIL)) {
time_t when = mail_longdate (&elt);
date = ctime (&when); /* use traditional date */
}
/* use POSIX-style date */
else date = mail_cdate (tmp,&elt);
if (!mmdf_append_msg (stream,sf,flags,date,message)) {
sprintf (tmp,"Error writing scratch file: %.80s",strerror (errno));
mm_log (tmp,ERROR);
}
/* get next message */
else if ((*af) (stream,data,&flags,&date,&message)) continue;
}
fclose (sf); /* punt scratch file */
return NIL; /* give up */
} while (message); /* until no more messages */
if (fflush (sf) || fstat (fileno (sf),&sbuf)) {
sprintf (tmp,"Error finishing scratch file: %.80s",strerror (errno));
mm_log (tmp,ERROR);
fclose (sf); /* punt scratch file */
return NIL; /* give up */
}
i = sbuf.st_size; /* size of scratch file */
mm_critical (stream); /* go critical */
if (((fd = mmdf_lock (dummy_file (file,mailbox),O_WRONLY|O_APPEND|O_CREAT,
S_IREAD|S_IWRITE,&lock,LOCK_EX)) < 0) ||
!(df = fdopen (fd,"ab"))) {
mm_nocritical (stream); /* done with critical */
sprintf (tmp,"Can't open append mailbox: %s",strerror (errno));
mm_log (tmp,ERROR);
return NIL;
}
fstat (fd,&sbuf); /* get current file size */
rewind (sf);
for (; i && ((j = fread (buf,1,min ((long) BUFLEN,i),sf)) &&
(fwrite (buf,1,j,df) == j)); i -= j);
fclose (sf); /* done with scratch file */
tp[0] = sbuf.st_atime; /* preserve atime */
/* make sure append wins */
if (i || (fflush (df) == EOF)) {
sprintf (buf,"Message append failed: %s",strerror (errno));
mm_log (buf,ERROR);
ftruncate (fd,sbuf.st_size);
tp[1] = sbuf.st_mtime; /* preserve mtime */
ret = NIL; /* return error */
}
else tp[1] = time (0); /* set mtime to now */
utime (file,tp); /* set the times */
mmdf_unlock (fd,NIL,&lock); /* unlock and close mailbox */
fclose (df);
mm_nocritical (stream); /* release critical */
return ret;
}
/* Write single message to append scratch file
* Accepts: MAIL stream
* scratch file
* flags
* message stringstruct
* Returns: NIL if write error, else T
*/
int mmdf_append_msg (MAILSTREAM *stream,FILE *sf,char *flags,char *date,
STRING *msg)
{
unsigned long uf;
int c;
long f = mail_parse_flags (stream,flags,&uf);
/* build initial header */
if ((fprintf (sf,"%sFrom %s@%s %sStatus: ",
mmdfhdr,myusername (),mylocalhost (),date) < 0) ||
(f&fSEEN && (putc ('R',sf) == EOF)) ||
(fputs ("\nX-Status: ",sf) == EOF) ||
(f&fDELETED && (putc ('D',sf) == EOF)) ||
(f&fFLAGGED && (putc ('F',sf) == EOF)) ||
(f&fANSWERED && (putc ('A',sf) == EOF)) ||
(f&fDRAFT && (putc ('T',sf) == EOF)) ||
(fputs ("\nX-Keywords:",sf) == EOF)) return NIL;
while (uf) /* write user flags */
if (fprintf (sf," %s",stream->user_flags[find_rightmost_bit (&uf)]) < 0)
return NIL;
/* tie off flags */
if (putc ('\n',sf) == EOF) return NIL;
while (SIZE (msg)) { /* copy text, flush CTRL/A and CR from CRLF */
if (((c = 0xff & SNX (msg)) != MMDFCHR) &&
(((c == '\r') && SIZE (msg) && ((c = SNX (msg)) != '\n') &&
(putc ('\r',sf) == EOF)) || (putc (c,sf) == EOF))) return NIL;
}
/* write trailer and return */
return (fputs (mmdfhdr,sf) == EOF) ? NIL : T;
}
/* Internal routines */
/* MMDF mail abort stream
* Accepts: MAIL stream
*/
void mmdf_abort (MAILSTREAM *stream)
{
if (LOCAL) { /* only if a file is open */
if (LOCAL->fd >= 0) close (LOCAL->fd);
if (LOCAL->ld >= 0) { /* have a mailbox lock? */
flock (LOCAL->ld,LOCK_UN);/* yes, release the lock */
close (LOCAL->ld); /* close the lock file */
unlink (LOCAL->lname); /* and delete it */
}
if (LOCAL->lname) fs_give ((void **) &LOCAL->lname);
/* free local text buffers */
if (LOCAL->buf) fs_give ((void **) &LOCAL->buf);
if (LOCAL->line) fs_give ((void **) &LOCAL->line);
/* nuke the local data */
fs_give ((void **) &stream->local);
stream->dtb = NIL; /* log out the DTB */
}
}
/* MMDF open and lock mailbox
* Accepts: file name to open/lock
* file open mode
* destination buffer for lock file name
* type of locking operation (LOCK_SH or LOCK_EX)
*/
int mmdf_lock (char *file,int flags,int mode,DOTLOCK *lock,int op)
{
int fd;
blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
(*bn) (BLOCK_FILELOCK,NIL);
/* try locking the easy way */
if (dotlock_lock (file,lock,-1)) {
/* got dotlock file, easy open */
if ((fd = open (file,flags,mode)) >= 0) flock (fd,op);
else dotlock_unlock (lock); /* open failed, free the dotlock */
}
/* no dot lock file, open file now */
else if ((fd = open (file,flags,mode)) >= 0) {
/* try paranoid way to make a dot lock file */
if (dotlock_lock (file,lock,fd)) {
close (fd); /* get fresh fd in case of timing race */
if ((fd = open (file,flags,mode)) >= 0) flock (fd,op);
else dotlock_unlock (lock); /* open failed, free the dotlock */
}
else flock (fd,op); /* paranoid way failed, just flock() it */
}
(*bn) (BLOCK_NONE,NIL);
return fd;
}
/* MMDF unlock and close mailbox
* Accepts: file descriptor
* (optional) mailbox stream to check atime/mtime
* (optional) lock file name
*/
void mmdf_unlock (int fd,MAILSTREAM *stream,DOTLOCK *lock)
{
struct stat sbuf;
time_t tp[2];
fstat (fd,&sbuf); /* get file times */
/* if stream and csh would think new mail */
if (stream && (sbuf.st_atime <= sbuf.st_mtime)) {
tp[0] = time (0); /* set atime to now */
/* set mtime to (now - 1) if necessary */
tp[1] = tp[0] > sbuf.st_mtime ? sbuf.st_mtime : tp[0] - 1;
/* set the times, note change */
if (!utime (stream->mailbox,tp)) LOCAL->filetime = tp[1];
}
flock (fd,LOCK_UN); /* release flock'ers */
if (!stream) close (fd); /* close the file if no stream */
dotlock_unlock (lock); /* flush the lock file if any */
}
/* MMDF mail parse and lock mailbox
* Accepts: MAIL stream
* space to write lock file name
* type of locking operation
* Returns: T if parse OK, critical & mailbox is locked shared; NIL if failure
*/
int mmdf_parse (MAILSTREAM *stream,DOTLOCK *lock,int op)
{
int ti,zn,m;
unsigned long i,j,k;
char c,*s,*t,*u,tmp[MAILTMPLEN],date[30];
int retain = T;
unsigned long nmsgs = stream->nmsgs;
unsigned long prevuid = nmsgs ? mail_elt (stream,nmsgs)->private.uid : 0;
unsigned long recent = stream->recent;
unsigned long oldnmsgs = stream->nmsgs;
short silent = stream->silent;
short pseudoseen = NIL;
struct stat sbuf;
STRING bs;
FDDATA d;
MESSAGECACHE *elt;
mail_lock (stream); /* guard against recursion or pingers */
/* toss out previous descriptor */
if (LOCAL->fd >= 0) close (LOCAL->fd);
mm_critical (stream); /* open and lock mailbox (shared OK) */
if ((LOCAL->fd = mmdf_lock (stream->mailbox,(LOCAL->ld >= 0) ?
O_RDWR : O_RDONLY,NIL,lock,op)) < 0) {
sprintf (tmp,"Mailbox open failed, aborted: %s",strerror (errno));
mm_log (tmp,ERROR);
mmdf_abort (stream);
mail_unlock (stream);
mm_nocritical (stream); /* done with critical */
return NIL;
}
fstat (LOCAL->fd,&sbuf); /* get status */
/* validate change in size */
if (sbuf.st_size < LOCAL->filesize) {
sprintf (tmp,"Mailbox shrank from %lu to %lu bytes, aborted",
(unsigned long) LOCAL->filesize,(unsigned long) sbuf.st_size);
mm_log (tmp,ERROR); /* this is pretty bad */
mmdf_unlock (LOCAL->fd,stream,lock);
mmdf_abort (stream);
mail_unlock (stream);
mm_nocritical (stream); /* done with critical */
return NIL;
}
/* new data? */
else if (i = sbuf.st_size - LOCAL->filesize) {
d.fd = LOCAL->fd; /* yes, set up file descriptor */
d.pos = LOCAL->filesize; /* get to that position in the file */
d.chunk = LOCAL->buf; /* initial buffer chunk */
d.chunksize = CHUNK; /* file chunk size */
INIT (&bs,fd_string,&d,i); /* initialize stringstruct */
/* skip leading whitespace for broken MTAs */
while (((c = CHR (&bs)) == '\n') || (c == '\r') ||
(c == ' ') || (c == '\t')) SNX (&bs);
if (SIZE (&bs)) { /* read new data */
/* remember internal header position */
j = LOCAL->filesize + GETPOS (&bs);
s = mmdf_mbxline (stream,&bs,&i);
stream->silent = T; /* quell main program new message events */
do { /* read MMDF header */
if (!(i && ISMMDF (s))){/* see if valid MMDF header */
sprintf (tmp,"Unexpected changes to mailbox (try restarting): %.20s",
s);
/* see if we can back up to a line */
if (i && (j > MMDFHDRLEN)) {
SETPOS (&bs,j -= MMDFHDRLEN);
/* read previous line */
s = mmdf_mbxline (stream,&bs,&i);
/* kill the error if it looks good */
if (i && ISMMDF (s)) tmp[0] = '\0';
}
if (tmp[0]) {
mm_log (tmp,ERROR);
mmdf_unlock (LOCAL->fd,stream,lock);
mmdf_abort (stream);
mail_unlock (stream);
mm_nocritical(stream);
return NIL;
}
}
/* instantiate first new message */
mail_exists (stream,++nmsgs);
(elt = mail_elt (stream,nmsgs))->valid = T;
recent++; /* assume recent by default */
elt->recent = T;
/* note position/size of internal header */
elt->private.special.offset = j;
elt->private.special.text.size = i;
s = mmdf_mbxline (stream,&bs,&i);
ti = 0; /* assume not a valid date */
zn = 0,t = NIL;
if (i) VALID (s,t,ti,zn);
if (ti) { /* generate plausible IMAPish date string */
/* this is also part of header */
elt->private.special.text.size += i;
date[2] = date[6] = date[20] = '-'; date[11] = ' ';
date[14] = date[17] = ':';
/* dd */
date[0] = t[ti - 2]; date[1] = t[ti - 1];
/* mmm */
date[3] = t[ti - 6]; date[4] = t[ti - 5]; date[5] = t[ti - 4];
/* hh */
date[12] = t[ti + 1]; date[13] = t[ti + 2];
/* mm */
date[15] = t[ti + 4]; date[16] = t[ti + 5];
if (t[ti += 6]==':'){ /* ss */
date[18] = t[++ti]; date[19] = t[++ti];
ti++; /* move to space */
}
else date[18] = date[19] = '0';
/* yy -- advance over timezone if necessary */
if (zn == ti) ti += (((t[zn+1] == '+') || (t[zn+1] == '-')) ? 6 : 4);
date[7] = t[ti + 1]; date[8] = t[ti + 2];
date[9] = t[ti + 3]; date[10] = t[ti + 4];
/* zzz */
t = zn ? (t + zn + 1) : "LCL";
date[21] = *t++; date[22] = *t++; date[23] = *t++;
if ((date[21] != '+') && (date[21] != '-')) date[24] = '\0';
else { /* numeric time zone */
date[24] = *t++; date[25] = *t++;
date[26] = '\0'; date[20] = ' ';
}
/* set internal date */
if (!mail_parse_date (elt,date)) {
sprintf (tmp,"Unable to parse internal date: %s",date);
mm_log (tmp,WARN);
}
}
else { /* make date from file date */
struct tm *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;
t = NIL; /* suppress line read */
}
/* header starts here */
elt->private.msg.header.offset = elt->private.special.text.size;
do { /* look for message body */
if (t) s = t = mmdf_mbxline (stream,&bs,&i);
else t = s; /* this line read was suppressed */
if (ISMMDF (s)) break;
/* this line is part of header */
elt->private.msg.header.text.size += i;
if (i) switch (*s) { /* check header lines */
case 'X': /* possible X-???: line */
if (s[1] == '-') { /* must be immediately followed by hyphen */
/* X-Status: becomes Status: in S case */
if (s[2] == 'S' && s[3] == 't' && s[4] == 'a' && s[5] == 't' &&
s[6] == 'u' && s[7] == 's' && s[8] == ':') s += 2;
/* possible X-Keywords */
else if (s[2] == 'K' && s[3] == 'e' && s[4] == 'y' &&
s[5] == 'w' && s[6] == 'o' && s[7] == 'r' &&
s[8] == 'd' && s[9] == 's' && s[10] == ':') {
char uf[MAILTMPLEN];
retain = NIL; /* don't retain continuation */
s += 11; /* flush leading whitespace */
while (*s && (*s != '\n') && ((*s != '\r') || (s[1] != '\n'))){
while (*s == ' ') s++;
/* find end of keyword */
if (!(u = strpbrk (s," \n\r"))) u = s + strlen (s);
/* got a keyword? */
if ((k = (u - s)) && (k < MAXUSERFLAG)) {
/* copy keyword */
strncpy (uf,s,k);
uf[k] = '\0';/* make sure tied off */
ucase (uf); /* coerce upper case */
for (j = 0; (juser_flags[j]; ++j)
if (!strcmp(uf,
ucase (strcpy(tmp,stream->user_flags[j])))) {
elt->user_flags |= ((long) 1) << j;
break;
}
}
s = u; /* advance to next keyword */
}
break;
}
/* possible X-IMAP */
else if ((s[2] == 'I') && (s[3] == 'M') && (s[4] == 'A') &&
(s[5] == 'P') && ((m = (s[6] == ':')) ||
((s[6] == 'b') && (s[7] == 'a') &&
(s[8] == 's') && (s[9] == 'e') &&
(s[10] == ':')))) {
retain = NIL; /* don't retain continuation */
if ((nmsgs == 1) && !stream->uid_validity) {
/* advance to data */
s += m ? 7 : 11;
/* flush whitespace */
while (*s == ' ') s++;
j = 0; /* slurp UID validity */
/* found a digit? */
while (isdigit (*s)) {
j *= 10; /* yes, add it in */
j += *s++ - '0';
}
/* flush whitespace */
while (*s == ' ') s++;
/* must have valid UID validity and UID last */
if (j && isdigit (*s)) {
/* pseudo-header seen if X-IMAP */
if (m) pseudoseen = LOCAL->pseudo = T;
/* save UID validity */
stream->uid_validity = j;
j = 0; /* slurp UID last */
while (isdigit (*s)) {
j *= 10; /* yes, add it in */
j += *s++ - '0';
}
/* save UID last */
stream->uid_last = j;
/* process keywords */
for (j = 0; (*s != '\n') && ((*s != '\r')||(s[1] != '\n'));
s = u,j++) {
/* flush leading whitespace */
while (*s == ' ') s++;
u = strpbrk (s," \n\r");
/* got a keyword? */
if ((k = (u - s)) && j < NUSERFLAGS) {
if (stream->user_flags[j])
fs_give ((void **) &stream->user_flags[j]);
stream->user_flags[j] = (char *) fs_get (k + 1);
strncpy (stream->user_flags[j],s,k);
stream->user_flags[j][k] = '\0';
}
}
}
}
break;
}
/* possible X-UID */
else if (s[2] == 'U' && s[3] == 'I' && s[4] == 'D' &&
s[5] == ':') {
retain = NIL; /* don't retain continuation */
/* only believe if have a UID validity */
if (stream->uid_validity && ((nmsgs > 1) || !pseudoseen)) {
s += 6; /* advance to UID value */
/* flush whitespace */
while (*s == ' ') s++;
j = 0;
/* found a digit? */
while (isdigit (*s)) {
j *= 10; /* yes, add it in */
j += *s++ - '0';
}
/* flush remainder of line */
while (*s != '\n') s++;
/* make sure not duplicated */
if (elt->private.uid)
sprintf (tmp,"Message %lu UID %lu already has UID %lu",
pseudoseen ? elt->msgno - 1 : elt->msgno,
j,elt->private.uid);
/* make sure UID doesn't go backwards */
else if (j <= prevuid)
sprintf (tmp,"Message %lu UID %lu less than %lu",
pseudoseen ? elt->msgno - 1 : elt->msgno,
j,prevuid + 1);
/* or skip by mailbox's recorded last */
else if (j > stream->uid_last)
sprintf (tmp,"Message %lu UID %lu greater than last %lu",
pseudoseen ? elt->msgno - 1 : elt->msgno,
j,stream->uid_last);
else { /* normal UID case */
prevuid = elt->private.uid = j;
break; /* exit this cruft */
}
mm_log (tmp,WARN);
/* invalidate UID validity */
stream->uid_validity = 0;
elt->private.uid = 0;
}
break;
}
}
/* otherwise fall into S case */
case 'S': /* possible Status: line */
if (s[0] == 'S' && s[1] == 't' && s[2] == 'a' && s[3] == 't' &&
s[4] == 'u' && s[5] == 's' && s[6] == ':') {
retain = NIL; /* don't retain continuation */
s += 6; /* advance to status flags */
do switch (*s++) {/* parse flags */
case 'R': /* message read */
elt->seen = T;
break;
case 'O': /* message old */
if (elt->recent) {
elt->recent = NIL;
recent--; /* it really wasn't recent */
}
break;
case 'D': /* message deleted */
elt->deleted = T;
break;
case 'F': /* message flagged */
elt->flagged = T;
break;
case 'A': /* message answered */
elt->answered = T;
break;
case 'T': /* message is a draft */
elt->draft = T;
break;
default: /* some other crap */
break;
} while (*s && (*s != '\n') && ((*s != '\r') || (s[1] != '\n')));
break; /* all done */
}
/* otherwise fall into default case */
default: /* ordinary header line */
if ((*s == 'S') || (*s == 's') ||
(((*s == 'X') || (*s == 'x')) && (s[1] == '-'))) {
char *e,*v;
/* must match what mail_filter() does */
for (u = s,v = tmp,e = u + min (i,MAILTMPLEN - 1);
(u < e) && ((c = *u) != ':') &&
((c > ' ') || ((c != ' ') && (c != '\t') &&
(c != '\015') && (c != '\012')));
*v++ = *u++);
*v = '\0'; /* tie off */
/* matches internal header? */
if (!strcmp (ucase (tmp),"STATUS") || !strcmp (tmp,"X-STATUS") ||
!strcmp (tmp,"X-KEYWORDS") || !strcmp (tmp,"X-UID") ||
!strcmp (tmp,"X-IMAP") || !strcmp (tmp,"X-IMAPBASE")) {
char err[MAILTMPLEN];
sprintf (err,"Discarding bogus %s header in message %lu",
tmp,elt->msgno);
mm_log (err,WARN);
retain = NIL; /* don't retain continuation */
break; /* different case or something */
}
}
/* retain or non-continuation? */
if (retain || ((*s != ' ') && (*s != '\t'))) {
retain = T; /* retaining continuation now */
/* line length in LF format newline */
k = i - (((i >= 2) && (s[i - 2] == '\r')) ? 1 : 0);
/* "internal" header size */
elt->private.data += k;
/* message size */
elt->rfc822_size += k + 1;
}
else {
char err[MAILTMPLEN];
sprintf (err,"Discarding bogus continuation in message %lu: ",
elt->msgno);
u = strncpy (err + strlen (err),s,(size_t) max (i,80));
u[80] = '\0'; /* make sure tired off */
if (u = strpbrk (u,"\r\n")) *u = '\0';
mm_log (err,WARN);
break; /* different case or something */
}
break;
}
} while (i && (*t != '\n') && ((*t != '\r') || (t[1] != '\n')));
/* "internal" header sans trailing newline */
if (i) elt->private.data--;
/* assign a UID if none found */
if (((nmsgs > 1) || !pseudoseen) && !elt->private.uid) {
prevuid = elt->private.uid = ++stream->uid_last;
elt->private.dirty = T;
}
else elt->private.dirty = elt->recent;
/* note size of header, location of text */
elt->private.msg.header.text.size =
(elt->private.msg.text.offset =
(LOCAL->filesize + GETPOS (&bs)) - elt->private.special.offset) -
elt->private.special.text.size;
/* note current position */
j = LOCAL->filesize + GETPOS (&bs);
if (i) do { /* look for next message */
s = mmdf_mbxline (stream,&bs,&i);
if (i) { /* got new data? */
if (ISMMDF (s)) break;
else {
elt->rfc822_size += i + (((i < 2) || s[i - 2] != '\r') ? 1 : 0);
/* update current position */
j = LOCAL->filesize + GETPOS (&bs);
}
}
} while (i); /* until found a header */
elt->private.msg.text.text.size = j -
(elt->private.special.offset + elt->private.msg.text.offset);
if (i) { /* get next header line */
/* remember first internal header position */
j = LOCAL->filesize + GETPOS (&bs);
s = mmdf_mbxline (stream,&bs,&i);
}
} while (i); /* until end of buffer */
if (pseudoseen) { /* flush pseudo-message if present */
/* decrement recent count */
if (mail_elt (stream,1)->recent) recent--;
/* and the exists count */
mail_exists (stream,nmsgs--);
mail_expunged(stream,1);/* fake an expunge of that message */
}
/* need to start a new UID validity? */
if (!stream->uid_validity) {
stream->uid_validity = time (0);
/* in case a whiner with no life */
if (mail_parameters (NIL,GET_USERHASNOLIFE,NIL))
stream->uid_nosticky = T;
else if (nmsgs) { /* don't bother if empty file */
LOCAL->dirty = T; /* make dirty to restart UID epoch */
/* need to rewrite msg 1 if not pseudo */
if (!LOCAL->pseudo) mail_elt (stream,1)->private.dirty = T;
mm_log ("Assigning new unique identifiers to all messages",NIL);
}
}
stream->nmsgs = oldnmsgs; /* whack it back down */
stream->silent = silent; /* restore old silent setting */
/* notify upper level of new mailbox sizes */
mail_exists (stream,nmsgs);
mail_recent (stream,recent);
/* mark dirty so O flags are set */
if (recent) LOCAL->dirty = T;
}
}
/* no change, don't babble if never got time */
else if (LOCAL->filetime && LOCAL->filetime != sbuf.st_mtime)
mm_log ("New mailbox modification time but apparently no changes",WARN);
/* update parsed file size and time */
LOCAL->filesize = sbuf.st_size;
LOCAL->filetime = sbuf.st_mtime;
return T; /* return the winnage */
}
/* MMDF read line from mailbox
* Accepts: mail stream
* stringstruct
* pointer to line size
* Returns: pointer to input line
*/
char *mmdf_mbxline (MAILSTREAM *stream,STRING *bs,unsigned long *size)
{
unsigned long i,j,k,m;
char *s,*t,*te,p1[CHUNK];
char *ret = "";
/* flush old buffer */
if (LOCAL->line) fs_give ((void **) &LOCAL->line);
/* if buffer needs refreshing */
if (!bs->cursize) SETPOS (bs,GETPOS (bs));
if (SIZE (bs)) { /* find newline */
/* end of fast scan */
te = (t = (s = bs->curpos) + bs->cursize) - 12;
while (s < te) if ((*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
(*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
(*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
(*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n')) {
--s; /* back up */
break; /* exit loop */
}
/* final character-at-a-time scan */
while ((s < t) && (*s != '\n')) ++s;
/* difficult case if line spans buffer */
if ((i = s - bs->curpos) == bs->cursize) {
memcpy (p1,bs->curpos,i); /* remember what we have so far */
/* load next buffer */
SETPOS (bs,k = GETPOS (bs) + i);
/* end of fast scan */
te = (t = (s = bs->curpos) + bs->cursize) - 12;
/* fast scan in overlap buffer */
while (s < te) if ((*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
(*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
(*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') ||
(*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n')) {
--s; /* back up */
break; /* exit loop */
}
/* final character-at-a-time scan */
while ((s < t) && (*s != '\n')) ++s;
/* huge line? */
if ((j = s - bs->curpos) == bs->cursize) {
SETPOS (bs,GETPOS (bs) + j);
/* look for end of line (s-l-o-w!!) */
for (m = SIZE (bs); m && (SNX (bs) != '\n'); --m,++j);
SETPOS (bs,k); /* go back to where it started */
}
/* got size of data, make buffer for return */
ret = LOCAL->line = (char *) fs_get (i + j + 2);
memcpy (ret,p1,i); /* copy first chunk */
while (j) { /* copy remainder */
if (!bs->cursize) SETPOS (bs,GETPOS (bs));
memcpy (ret + i,bs->curpos,k = min (j,bs->cursize));
i += k; /* account for this much read in */
j -= k;
bs->curpos += k; /* increment new position */
bs->cursize -= k; /* eat that many bytes */
}
if (SIZE (bs)) SNX (bs); /* skip over newline if one seen */
ret[i++] = '\n'; /* make sure newline at end */
ret[i] = '\0'; /* makes debugging easier */
}
else { /* this is easy */
ret = bs->curpos; /* string it at this position */
bs->curpos += ++i; /* increment new position */
bs->cursize -= i; /* eat that many bytes */
}
*size = i; /* return that to user */
}
else *size = 0; /* end of data, return empty */
/* embedded MMDF header at end of line? */
if ((*size > sizeof (MMDFHDRTXT)) &&
(s = ret + *size - (i = sizeof (MMDFHDRTXT) - 1)) && ISMMDF (s)) {
SETPOS (bs,GETPOS (bs) - i);/* back up to start of MMDF header */
*size -= i; /* reduce length of line */
ret[*size - 1] = '\n'; /* force newline at end */
}
return ret;
}
/* MMDF make pseudo-header
* Accepts: MAIL stream
* buffer to write pseudo-header
* Returns: length of pseudo-header
*/
unsigned long mmdf_pseudo (MAILSTREAM *stream,char *hdr)
{
int i;
char *s,tmp[MAILTMPLEN];
time_t now = time (0);
rfc822_fixed_date (tmp);
sprintf (hdr,"%sFrom %s %.24s\nDate: %s\nFrom: %s <%s@%.80s>\nSubject: %s\nMessage-ID: <%lu@%.80s>\nX-IMAP: %010lu %010lu",
mmdfhdr,pseudo_from,ctime (&now),
tmp,pseudo_name,pseudo_from,mylocalhost (),pseudo_subject,
(unsigned long) now,mylocalhost (),stream->uid_validity,
stream->uid_last);
for (s = hdr + strlen (hdr),i = 0; i < NUSERFLAGS; ++i)
if (stream->user_flags[i])
sprintf (s += strlen (s)," %s",stream->user_flags[i]);
sprintf (s += strlen (s),"\nStatus: RO\n\n%s\n%s",pseudo_msg,mmdfhdr);
return strlen (hdr);
}
/* MMDF make status string
* Accepts: MAIL stream
* destination string to write
* message cache entry
* non-zero flag to write UID (.LT. 0 to write UID base info too)
* Returns: length of string
*/
unsigned long mmdf_xstatus (MAILSTREAM *stream,char *status,MESSAGECACHE *elt,
long flag)
{
char *t,stack[64];
char *s = status;
unsigned long n;
int pad = 50;
/* This used to use sprintf(), but thanks to certain cretinous C libraries
with horribly slow implementations of sprintf() I had to change it to this
mess. At least it should be fast. */
/* need to write X-IMAPbase: header? */
if ((flag < 0) && !stream->uid_nosticky) {
*s++ = 'X'; *s++ = '-'; *s++ = 'I'; *s++ = 'M'; *s++ = 'A'; *s++ = 'P';
*s++ = 'b'; *s++ = 'a'; *s++ = 's'; *s++ = 'e'; *s++ = ':'; *s++ = ' ';
t = stack;
n = stream->uid_validity; /* push UID validity digits on the stack */
do *t++ = (char) (n % 10) + '0';
while (n /= 10);
/* pop UID validity digits from stack */
while (t > stack) *s++ = *--t;
*s++ = ' ';
n = stream->uid_last; /* push UID last digits on the stack */
do *t++ = (char) (n % 10) + '0';
while (n /= 10);
/* pop UID last digits from stack */
while (t > stack) *s++ = *--t;
for (n = 0; n < NUSERFLAGS; ++n) if (t = stream->user_flags[n])
for (*s++ = ' '; *t; *s++ = *t++);
*s++ = '\n';
pad += 30; /* increased padding if have IMAPbase */
}
*s++ = 'S'; *s++ = 't'; *s++ = 'a'; *s++ = 't'; *s++ = 'u'; *s++ = 's';
*s++ = ':'; *s++ = ' ';
if (elt->seen) *s++ = 'R';
*s++ = 'O'; *s++ = '\n';
*s++ = 'X'; *s++ = '-'; *s++ = 'S'; *s++ = 't'; *s++ = 'a'; *s++ = 't';
*s++ = 'u'; *s++ = 's'; *s++ = ':'; *s++ = ' ';
if (elt->deleted) *s++ = 'D';
if (elt->flagged) *s++ = 'F';
if (elt->answered) *s++ = 'A';
if (elt->draft) *s++ = 'T';
*s++ = '\n';
if (!stream->uid_nosticky) { /* cretins with no life can't use this */
*s++ = 'X'; *s++ = '-'; *s++ = 'K'; *s++ = 'e'; *s++ = 'y'; *s++ = 'w';
*s++ = 'o'; *s++ = 'r'; *s++ = 'd'; *s++ = 's'; *s++ = ':';
if (n = elt->user_flags) do {
*s++ = ' ';
for (t = stream->user_flags[find_rightmost_bit (&n)]; *t; *s++ = *t++);
} while (n);
n = s - status; /* get size of stuff so far */
/* pad X-Keywords to make size constant */
if (n < pad) for (n = pad - n; n > 0; --n) *s++ = ' ';
*s++ = '\n';
if (flag) { /* want to include UID? */
t = stack;
n = elt->private.uid; /* push UID digits on the stack */
do *t++ = (char) (n % 10) + '0';
while (n /= 10);
*s++ = 'X'; *s++ = '-'; *s++ = 'U'; *s++ = 'I'; *s++ = 'D'; *s++ = ':';
*s++ = ' ';
/* pop UID from stack */
while (t > stack) *s++ = *--t;
*s++ = '\n';
}
}
*s++ = '\n'; *s = '\0'; /* end of extended message status */
return s - status; /* return size of resulting string */
}
/* Rewrite mailbox file
* Accepts: MAIL stream, must be critical and locked
* return pointer to number of expunged messages if want expunge
* lock file name
* Returns: T if success and mailbox unlocked, NIL if failure
*/
#define OVERFLOWBUFLEN 8192 /* initial overflow buffer length */
long mmdf_rewrite (MAILSTREAM *stream,unsigned long *nexp,DOTLOCK *lock)
{
MESSAGECACHE *elt;
MMDFFILE f;
char *s;
time_t tp[2];
long ret,flag;
unsigned long i,j;
unsigned long recent = stream->recent;
unsigned long size = LOCAL->pseudo ? mmdf_pseudo (stream,LOCAL->buf) : 0;
if (nexp) *nexp = 0; /* initially nothing expunged */
/* calculate size of mailbox after rewrite */
for (i = 1,flag = LOCAL->pseudo ? 1 : -1; i <= stream->nmsgs; i++)
if (!(elt = mail_elt (stream,i))->deleted || !nexp) {
/* add RFC822 size of this message */
size += elt->private.special.text.size + elt->private.data +
mmdf_xstatus (stream,LOCAL->buf,elt,flag) +
elt->private.msg.text.text.size + MMDFHDRLEN;
flag = 1; /* only count X-IMAPbase once */
}
/* extend the file as necessary */
if (ret = mmdf_extend (stream,size)) {
/* Set up buffered I/O file structure
* curpos current position being written through buffering
* filepos current position being written physically to the disk
* bufpos current position being written in the buffer
* protect current maximum position that can be written to the disk
* before buffering is forced
* The code tries to buffer so that that disk is written in multiples of
* OVERBLOWBUFLEN bytes.
*/
f.stream = stream; /* note mail stream */
f.curpos = f.filepos = 0; /* start of file */
f.protect = stream->nmsgs ? /* initial protection pointer */
mail_elt (stream,1)->private.special.offset : 8192;
f.bufpos = f.buf = (char *) fs_get (f.buflen = OVERFLOWBUFLEN);
if (LOCAL->pseudo) /* update pseudo-header */
mmdf_write (&f,LOCAL->buf,mmdf_pseudo (stream,LOCAL->buf));
/* loop through all messages */
for (i = 1,flag = LOCAL->pseudo ? 1 : -1; i <= stream->nmsgs;) {
elt = mail_elt (stream,i);/* get cache */
if (nexp && elt->deleted){/* expunge this message? */
/* one less recent message */
if (elt->recent) --recent;
mail_expunged(stream,i);/* notify upper levels */
++*nexp; /* count up one more expunged message */
}
else { /* preserve this message */
i++; /* advance to next message */
if ((flag < 0) || /* need to rewrite message? */
(elt->private.dirty || (f.curpos != elt->private.special.offset) ||
(elt->private.msg.header.text.size !=
(elt->private.data +
mmdf_xstatus (stream,LOCAL->buf,elt,flag))))) {
unsigned long newoffset = f.curpos;
/* yes, seek to internal header */
lseek (LOCAL->fd,elt->private.special.offset,L_SET);
read (LOCAL->fd,LOCAL->buf,elt->private.special.text.size);
/* see if need to squeeze out a CR */
if (LOCAL->buf[elt->private.special.text.size - 2] == '\r') {
LOCAL->buf[--elt->private.special.text.size - 1] = '\n';
--size; /* squeezed out a CR from PC */
}
/* protection pointer moves to RFC822 header */
f.protect = elt->private.special.offset +
elt->private.msg.header.offset;
/* write internal header */
mmdf_write (&f,LOCAL->buf,elt->private.special.text.size);
/* get RFC822 header */
s = mmdf_header (stream,elt->msgno,&j,FT_INTERNAL);
/* in case this got decremented */
elt->private.msg.header.offset = elt->private.special.text.size;
/* header size, sans trailing newline */
if ((j < 2) || (s[j - 2] == '\n')) j--;
if (j != elt->private.data) fatal ("header size inconsistent");
/* protection pointer moves to RFC822 text */
f.protect = elt->private.special.offset +
elt->private.msg.text.offset;
mmdf_write (&f,s,j); /* write RFC822 header */
/* write status and UID */
mmdf_write (&f,LOCAL->buf,
j = mmdf_xstatus (stream,LOCAL->buf,elt,flag));
flag = 1; /* only write X-IMAPbase once */
/* new file header size */
elt->private.msg.header.text.size = elt->private.data + j;
/* did text move? */
if (f.curpos != f.protect) {
/* get message text */
s = mmdf_text_work (stream,elt,&j,FT_INTERNAL);
/* this can happen if CRs were squeezed */
if (j < elt->private.msg.text.text.size) {
/* so fix up counts */
size -= elt->private.msg.text.text.size - j;
elt->private.msg.text.text.size = j;
}
/* can't happen it says here */
else if (j > elt->private.msg.text.text.size)
fatal ("text size inconsistent");
/* new text offset, status/UID may change it */
elt->private.msg.text.offset = f.curpos - newoffset;
/* protection pointer moves to next message */
f.protect = (i <= stream->nmsgs) ?
mail_elt (stream,i)->private.special.offset :
(f.curpos + j + MMDFHDRLEN);
mmdf_write (&f,s,j);/* write text */
/* write trailing newline */
mmdf_write (&f,mmdfhdr,MMDFHDRLEN);
}
else { /* tie off header and status */
mmdf_write (&f,NIL,NIL);
f.curpos = f.protect =/* restart everything at end of message */
f.filepos += elt->private.msg.text.text.size + MMDFHDRLEN;
}
/* new internal header offset */
elt->private.special.offset = newoffset;
elt->private.dirty =NIL;/* message is now clean */
}
else { /* no need to rewrite this message */
/* tie off previous message if needed */
mmdf_write (&f,NIL,NIL);
f.curpos = f.protect =/* restart everything at end of message */
f.filepos += elt->private.special.text.size +
elt->private.msg.header.text.size +
elt->private.msg.text.text.size + MMDFHDRLEN;
}
}
}
mmdf_write (&f,NIL,NIL); /* tie off final message */
if (size != f.filepos) fatal ("file size inconsistent");
fs_give ((void **) &f.buf); /* free buffer */
/* make sure tied off */
ftruncate (LOCAL->fd,LOCAL->filesize = size);
fsync (LOCAL->fd); /* make sure the updates take */
if (size && (flag < 0)) fatal ("lost UID base information");
LOCAL->dirty = NIL; /* no longer dirty */
/* notify upper level of new mailbox sizes */
mail_exists (stream,stream->nmsgs);
mail_recent (stream,recent);
/* set atime to now, mtime a second earlier */
tp[1] = (tp[0] = time (0)) - 1;
/* set the times, note change */
if (!utime (stream->mailbox,tp)) LOCAL->filetime = tp[1];
close (LOCAL->fd); /* close and reopen file */
if ((LOCAL->fd = open (stream->mailbox,O_RDWR,NIL)) < 0) {
sprintf (LOCAL->buf,"Mailbox open failed, aborted: %s",strerror (errno));
mm_log (LOCAL->buf,ERROR);
mmdf_abort (stream);
}
dotlock_unlock (lock); /* flush the lock file */
}
return ret; /* return state from algorithm */
}
/* Extend MMDF mailbox file
* Accepts: MAIL stream
* new desired size
* Return: T if success, else NIL
*/
long mmdf_extend (MAILSTREAM *stream,unsigned long size)
{
unsigned long i = (size > LOCAL->filesize) ? size - LOCAL->filesize : 0;
if (i) { /* does the mailbox need to grow? */
if (i > LOCAL->buflen) { /* make sure have enough space */
/* this user won the lottery all right */
fs_give ((void **) &LOCAL->buf);
LOCAL->buf = (char *) fs_get ((LOCAL->buflen = i) + 1);
}
memset (LOCAL->buf,'\0',i); /* get a block of nulls */
while (T) { /* until write successful or punt */
lseek (LOCAL->fd,LOCAL->filesize,L_SET);
if ((write (LOCAL->fd,LOCAL->buf,i) >= 0) && !fsync (LOCAL->fd)) break;
else {
long e = errno; /* note error before doing ftruncate */
ftruncate (LOCAL->fd,LOCAL->filesize);
if (mm_diskerror (stream,e,NIL)) {
fsync (LOCAL->fd); /* user chose to punt */
sprintf (LOCAL->buf,"Unable to extend mailbox: %s",strerror (e));
mm_log (LOCAL->buf,ERROR);
return NIL;
}
}
}
}
return LONGT;
}
/* Write data to buffered file
* Accepts: buffered file pointer
* file data or NIL to indicate "flush buffer"
* date size (ignored for "flush buffer")
* Does not return until success
*/
void mmdf_write (MMDFFILE *f,char *buf,unsigned long size)
{
unsigned long i,j,k;
if (buf) { /* doing buffered write? */
i = f->bufpos - f->buf; /* yes, get size of current buffer data */
/* yes, have space in current buffer chunk? */
if (j = i ? ((f->buflen - i) % OVERFLOWBUFLEN) : f->buflen) {
/* yes, fill up buffer as much as we can */
memcpy (f->bufpos,buf,k = min (j,size));
f->bufpos += k; /* new buffer position */
f->curpos += k; /* new current position */
if (j -= k) return; /* all done if still have buffer free space */
buf += k; /* full, get new unwritten data pointer */
size -= k; /* new data size */
i += k; /* new buffer data size */
}
/* This chunk of the buffer is full. See if can make some space by
* writing to the disk, if there's enough unprotected space to do so.
* Try to fill out any unaligned chunk, along with any subsequent full
* chunks that will fit in unprotected space.
*/
/* any unprotected space we can write to? */
if (j = min (i,f->protect - f->filepos)) {
/* yes, filepos not at chunk boundary? */
if ((k = f->filepos % OVERFLOWBUFLEN) && ((k = OVERFLOWBUFLEN - k) < j))
j -= k; /* yes, and can write out partial chunk */
else k = 0; /* no partial chunk to write */
/* if at least a chunk free, write that too */
if (j > OVERFLOWBUFLEN) k += j - (j % OVERFLOWBUFLEN);
if (k) { /* write data if there is anything we can */
mmdf_phys_write (f,f->buf,k);
/* slide buffer */
if (i -= k) memmove (f->buf,f->buf + k,i);
f->bufpos = f->buf + i; /* new end of buffer */
}
}
/* Have flushed the buffer as best as possible. All done if no more
* data to write. Otherwise, if the buffer is empty AND if the unwritten
* data is larger than a chunk AND the unprotected space is also larger
* than a chunk, then write as many chunks as we can directly from the
* data. Buffer the rest, expanding the buffer as needed.
*/
if (size) { /* have more data that we need to buffer? */
/* can write any of it to disk instead? */
if ((f->bufpos == f->buf) &&
((j = min (f->protect - f->filepos,size)) > OVERFLOWBUFLEN)) {
/* write as much as we can right now */
mmdf_phys_write (f,buf,j -= (j % OVERFLOWBUFLEN));
buf += j; /* new data pointer */
size -= j; /* new data size */
f->curpos += j; /* advance current pointer */
}
if (size) { /* still have data that we need to buffer? */
/* yes, need to expand the buffer? */
if ((i = ((f->bufpos + size) - f->buf)) > f->buflen) {
/* note current position in buffer */
j = f->bufpos - f->buf;
i += OVERFLOWBUFLEN; /* yes, grow another chunk */
fs_resize ((void **) &f->buf,f->buflen = i - (i % OVERFLOWBUFLEN));
/* in case buffer relocated */
f->bufpos = f->buf + j;
}
/* buffer remaining data */
memcpy (f->bufpos,buf,size);
f->bufpos += size; /* new end of buffer */
f->curpos += size; /* advance current pointer */
}
}
}
else { /* flush buffer to disk */
mmdf_phys_write (f,f->buf,i = f->bufpos - f->buf);
f->bufpos = f->buf; /* reset buffer */
/* update positions */
f->curpos = f->protect = f->filepos;
}
}
/* Physical disk write
* Accepts: buffered file pointer
* buffer address
* buffer size
* Does not return until success
*/
void mmdf_phys_write (MMDFFILE *f,char *buf,size_t size)
{
MAILSTREAM *stream = f->stream;
/* write data at desired position */
while (size && ((lseek (LOCAL->fd,f->filepos,L_SET) < 0) ||
(write (LOCAL->fd,buf,size) < 0))) {
int e;
char tmp[MAILTMPLEN];
sprintf (tmp,"Unable to write to mailbox: %s",strerror (e = errno));
mm_log (tmp,ERROR);
mm_diskerror (NIL,e,T); /* serious problem, must retry */
}
f->filepos += size; /* update file position */
}