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sm_mac.c
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C/C++ Source or Header
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1993-12-13
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5KB
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159 lines
/*
* Program: Subscription Manager (Mac based)
*
* Author: Mark Crispin
* 6158 Lariat Loop NE
* Bainbridge Island, WA 98110-2098
* Internet: MRC@Panda.COM
*
* Date: 13 December 1993
* Last Edited: 13 December 1993
*
* Copyright 1993 by Mark Crispin
*
* 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 notices and this permission notice appear in supporting
* documentation, and that the name of Mark Crispin 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
* MARK CRISPIN 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
* MARK CRISPIN 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 "mail.h"
#include "osdep.h"
#include "misc.h"
#include <unix.h>
#include <fcntl.h>
#define SUBSCRIPTIONFILE(t) strcpy (t,"Mailbox List")
/* Subscribe to mailbox
* Accepts: mailbox name
* Returns: T on success, NIL on failure
*/
long sm_subscribe (char *mailbox)
{
int fd;
char *s,*t,*txt,tmp[MAILTMPLEN],tmpx[MAILTMPLEN];
struct stat sbuf;
long ret = T;
SUBSCRIPTIONFILE (tmp); /* open subscription database */
if ((fd = open (tmp,O_RDWR|O_CREAT|O_BINARY)) >= 0) {
fstat (fd,&sbuf); /* get file size and read data */
read (fd,s = txt = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
s[sbuf.st_size] = '\0'; /* tie off string */
while (t = strchr (s,'\015')){/* for each line in database */
*t++ = '\0'; /* tie off string */
if (strcmp (s,mailbox)) s = t;
else { /* oops, it's subscribed */
sprintf (tmp,"Already subscribed to mailbox %s",mailbox);
mm_log (tmp,ERROR);
ret = NIL;
break;
}
}
if (ret) { /* append to end of file if OK */
lseek (fd,sbuf.st_size,SEEK_SET);
sprintf (tmp,"%s\015",mailbox);
write (fd,tmp,strlen (tmp));
}
close (fd); /* close off file */
fs_give ((void **) &txt); /* free database */
}
else {
mm_log ("Can't create subscription database",ERROR);
ret = NIL;
}
return ret; /* all done */
}
/* Unsubscribe from mailbox
* Accepts: mailbox name
* Returns: T on success, NIL on failure
*/
long sm_unsubscribe (char *mailbox)
{
int fd;
char *s,*t,*txt,*end,tmp[MAILTMPLEN],tmpx[MAILTMPLEN];
struct stat sbuf;
long ret = NIL;
SUBSCRIPTIONFILE (tmp); /* open subscription database */
if ((fd = open (tmp,O_RDONLY|O_BINARY)) >= 0) {
fstat (fd,&sbuf); /* get file size and read data */
read (fd,s = txt = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
close (fd);
/* tie off string */
*(end = s + sbuf.st_size) = '\0';
while (t = strchr (s,'\015')){/* for each line in database */
*t++ = '\0'; /* temporarily tie off string */
if (strcmp (s,mailbox)) { /* match? */
t[-1] = '\n'; /* no, restore newline */
s = t; /* try next subscription */
}
else { /* cancel subscription */
if (t != end) memcpy (s,t,1 + end - t);
end -= t - s; /* calculate new end of database */
ret = T; /* note cancelled a subscription */
}
}
if (ret) { /* found any? */
if ((fd = open (tmp,O_WRONLY|O_TRUNC|O_BINARY)) >= 0) {
if (end != txt) write (fd,txt,end - txt);
close (fd); /* close off file */
}
else mm_log ("Error re-opening subscription file",ERROR);
}
else { /* subscription not found */
sprintf (tmp,"Not subscribed to mailbox %s",mailbox);
mm_log (tmp,ERROR); /* error if at end */
}
fs_give ((void **) &txt); /* free database */
}
else {
mm_log ("No subscriptions",ERROR);
ret = NIL;
}
return ret; /* all done */
}
/* Read subscription database
* Accepts: pointer to subscription database handle (handle NIL if first time)
* Returns: character string for subscription database or NIL if done
*/
char *sm_read (void **sdb)
{
int fd;
char *s,*t,tmp[MAILTMPLEN];
struct stat sbuf;
if (!*sdb) { /* first time through? */
SUBSCRIPTIONFILE (tmp); /* open subscription database */
if ((fd = open (tmp,O_RDONLY|O_BINARY)) >= 0) {
fstat (fd,&sbuf); /* get file size and read data */
read (fd,s = (char *) (*sdb = fs_get (sbuf.st_size + 1)),sbuf.st_size);
close (fd); /* close file */
s[sbuf.st_size] = '\0'; /* tie off string */
if (t = strtok (s,"\015")) return t;
}
}
/* subsequent times through database */
else if (t = strtok (NIL,"\015")) return t;
fs_give (sdb); /* free database */
return NIL; /* all done */
}