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/* $Cambridge: hermes/src/prayer/session/stream.c,v 1.3 2008/09/16 09:59:58 dpc22 Exp $ */
/************************************************
* Prayer - a Webmail Interface *
************************************************/
/* Copyright (c) University of Cambridge 2000 - 2008 */
/* See the file NOTICE for conditions of use and distribution. */
#include "prayer_session.h"
/* Helper functions for c-client stream object */
/* Mostly working around ideas that c-client seems to use text strings
* rather than flag bits to mark messages. May just be limits in my
* understanding of c-client, but I can't find a better interface to work
* with at the moment */
/* ====================================================================== */
/* stream_check_uid() ***************************************************
*
* Check that msgno and msguid match.
* session:
* stream:
* msgno: Message Number which should contain this UID (bext first guess)
* msguid: Message UID that we are looking for
*
* Returns: Msgno of message containing this UID (typically msgno unless
* an external expunge event has just taken place).
***********************************************************************/
unsigned long
stream_check_uid(struct session *session,
MAILSTREAM * stream,
unsigned long msgno, unsigned long msguid)
{
if ((msgno == 0) || (msguid == 0)) {
session_message(session, "Reference to illegal Message UID 0");
session_log(session,
"[stream_check_uid] Reference to illegal Message UID 0");
return (0);
}
/* Could just do reverse lookup (msguid -> msgno). This way is a bit
* more efficient as don't have to scan the entire index looking for a
* particular UID most of the time */
if ((msgno > stream->nmsgs)
|| (ml_uid(session, stream, msgno) != msguid)) {
/* Messages have moved: external expunge event */
if (((msgno = ml_msgno(session, stream, msguid)) == 0) ||
(msgno > stream->nmsgs)) {
/* Couldn't find this UID in folder */
session_message(session, "Message UID %lu has been expunged",
msguid);
return (0);
}
}
return (msgno);
}
/* stream_find_unread() **************************************************
*
* Find first unread message in stream.
************************************************************************/
unsigned long
stream_find_unread(struct session *session, MAILSTREAM * stream)
{
unsigned long msgno;
char seq[64];
if (stream->nmsgs == 0)
return (0);
sprintf(seq, "1:%lu", stream->nmsgs);
ml_fetch_fast(session, stream, seq, 0);
/* Record last unread message from inbox */
for (msgno = 1; msgno <= stream->nmsgs; msgno++) {
if (!mail_elt(stream, msgno)->seen)
return (msgno);
}
return (0);
}
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