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smanager.c
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C/C++ Source or Header
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1998-09-16
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4KB
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137 lines
/*
* Program: Subscription Manager
*
* 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: 3 December 1992
* Last Edited: 14 April 1997
*
* Copyright 1997 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 <stdio.h>
#include <ctype.h>
#include "mail.h"
#include "osdep.h"
#include "misc.h"
/* Subscribe to mailbox
* Accepts: mailbox name
* Returns: T on success, NIL on failure
*/
long sm_subscribe (char *mailbox)
{
FILE *f;
char *s,db[MAILTMPLEN],tmp[MAILTMPLEN];
SUBSCRIPTIONFILE (db); /* open subscription database */
if (f = fopen (db,"r")) { /* make sure not already there */
while (fgets (tmp,MAILTMPLEN,f)) {
if (s = strchr (tmp,'\n')) *s = '\0';
if (!strcmp (tmp,mailbox)) {/* already subscribed? */
sprintf (tmp,"Already subscribed to mailbox %s",mailbox);
mm_log (tmp,ERROR);
fclose (f);
return NIL;
}
}
fclose (f);
}
if (!(f = fopen (db,"a"))) { /* append new entry */
mm_log ("Can't create subscription database",ERROR);
return NIL;
}
fprintf (f,"%s\n",mailbox);
return (fclose (f) == EOF) ? NIL : T;
}
/* Unsubscribe from mailbox
* Accepts: mailbox name
* Returns: T on success, NIL on failure
*/
long sm_unsubscribe (char *mailbox)
{
FILE *f,*tf;
char *s,tmp[MAILTMPLEN],old[MAILTMPLEN],newname[MAILTMPLEN];
long ret = NIL;
SUBSCRIPTIONFILE (old); /* open subscription database */
if (!(f = fopen (old,"r"))) { /* can we? */
mm_log ("No subscriptions",ERROR);
return NIL;
}
SUBSCRIPTIONTEMP (newname); /* make tmp file name */
if (!(tf = fopen (newname,"w"))) {
mm_log ("Can't create subscription temporary file",ERROR);
fclose (f);
return NIL;
}
while (fgets (tmp,MAILTMPLEN,f)) {
if (s = strchr (tmp,'\n')) *s = '\0';
if (strcmp (tmp,mailbox)) fprintf (tf,"%s\n",tmp);
else ret = T; /* found the name */
}
fclose (f);
if (fclose (tf) == EOF) {
mm_log ("Can't write subscription temporary file",ERROR);
return NIL;
}
if (!ret) {
sprintf (tmp,"Not subscribed to mailbox %s",mailbox);
mm_log (tmp,ERROR); /* error if at end */
}
else rename (newname,old);
return ret;
}
/* Read subscription database
* Accepts: pointer to subscription database handle (handle NIL if first time)
* Returns: character string for subscription database or NIL if done
*/
static char sbname[MAILTMPLEN];
char *sm_read (void **sdb)
{
FILE *f = (FILE *) *sdb;
char *s;
if (!f) { /* first time through? */
SUBSCRIPTIONFILE (sbname); /* open subscription database */
/* make sure not already there */
if (f = fopen (sbname,"r")) *sdb = (void *) f;
else return NIL;
}
if (fgets (sbname,MAILTMPLEN,f)) {
if (s = strchr (sbname,'\n')) *s = '\0';
return sbname;
}
fclose (f); /* all done */
*sdb = NIL; /* zap sdb */
return NIL;
}