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/* $Id: mail.c,v 1.16 2004/03/03 03:47:04 reinelt Exp $
 *
 * email specific functions
 *
 * Copyright 2001 Axel Ehnert <axel@ehnert.net>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * LCD4Linux is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * $Log: mail.c,v $
 * Revision 1.16  2004/03/03 03:47:04  reinelt
 * big patch from Martin Hejl:
 * - use qprintf() where appropriate
 * - save CPU cycles on gettimeofday()
 * - add quit() functions to free allocated memory
 * - fixed lots of memory leaks
 *
 * Revision 1.15  2004/01/29 04:40:02  reinelt
 * every .c file includes "config.h" now
 *
 * Revision 1.14  2004/01/09 04:16:06  reinelt
 * added 'section' argument to cfg_get(), but NULLed it on all calls by now.
 *
 * Revision 1.13  2003/10/05 17:58:50  reinelt
 * libtool junk; copyright messages cleaned up
 *
 * Revision 1.12  2003/02/22 07:53:10  reinelt
 * cfg_get(key,defval)
 *
 * Revision 1.11  2001/09/12 05:58:16  reinelt
 * fixed bug in mail2.c
 *
 * Revision 1.10  2001/09/12 05:37:22  reinelt
 *
 * fixed a bug in seti.c (file was never closed, lcd4linux run out of fd's
 *
 * improved socket debugging
 *
 * Revision 1.9  2001/08/05 17:13:29  reinelt
 *
 * cleaned up inlude of sys/time.h and time.h
 *
 * Revision 1.8  2001/03/15 15:49:23  ltoetsch
 * fixed compile HD44780.c, cosmetics
 *
 * Revision 1.7  2001/03/15 14:25:05  ltoetsch
 * added unread/total news
 *
 * Revision 1.6  2001/03/14 13:19:29  ltoetsch
 * Added pop3/imap4 mail support
 *
 * Revision 1.5  2001/03/13 08:34:15  reinelt
 *
 * corrected a off-by-one bug with sensors
 *
 * Revision 1.4  2001/03/08 09:02:04  reinelt
 *
 * seti client cleanup
 *
 * Revision 1.3  2001/02/21 04:48:13  reinelt
 *
 * big mailbox patch from Axel Ehnert
 * thanks to herp for his idea to check mtime of mailbox
 *
 * Revision 1.2  2001/02/19 00:15:46  reinelt
 *
 * integrated mail and seti client
 * major rewrite of parser and tokenizer to support double-byte tokens
 *
 * Revision 1.1  2001/02/18 22:11:34  reinelt
 * *** empty log message ***
 *
 */

/* 
 * exported functions:
 *
 * Mail (int index, int *num)
 *   returns 0 if ok, -1 if error
 *   sets num to number of emails in mailbox #index
 *
 */

#define FALSE 0
#define TRUE 1

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "cfg.h"
#include "debug.h"
#include "mail.h"

int Mail (int index, int *num, int *unseen)
{
  FILE *fstr;
  char buffer[32];
  static int   cfgmbx[MAILBOXES+1]={[0 ... MAILBOXES]=TRUE,}; // Mailbox #index configured?
  static time_t mbxlt[MAILBOXES+1]={[0 ... MAILBOXES]=0,};    // mtime of Mailbox #index
  static int   mbxnum[MAILBOXES+1]={[0 ... MAILBOXES]=0,};    // Last calculated # of mails
  static time_t   now[MAILBOXES+1]={[0 ... MAILBOXES]=0,};    // Last call to procedure at 
                                                              // for Mailbox #index
  char *fnp1;
  int v1=0;
  int last_line_blank1;                   // Was the last line blank?
  struct stat fst;
  int rc;
  char *s:
  int i;

  char *txt;
  char txt1[100];

  if (index<0 || index>MAILBOXES) return -1;

  if (now[index] == 0) { /* first time, to give faster a chance */
    now[index] = -1-index;
    return 0;
  }
  if (now[index] < -1) { /* wait different time to avoid long startup */
    now[index]++;
    return 0;
  }
  if (now[index] > 0) {	/* not first time, delay  */
    sprintf(txt1, "Delay_e%d", index); 
    s= cfg_get(NULL, txt1, "5");
    i=now[index]+atoi(s);
    free(s);
    if (time(NULL)<=i)
      return 0;   // no more then 5/Delay_eX seconds after last check?
  }
  time(&now[index]);                      // for Mailbox #index
  /*
    Build the filename from the config
  */
  qprintf(buffer, sizeof(buffer), "Mailbox%d", index);
  fnp1=cfg_get(NULL, buffer, NULL);
  if (fnp1==NULL || *fnp1=='\0') {
    cfgmbx[index]=FALSE;                  // There is now entry for Mailbox #index
  }
  v1=mbxnum[index];
  /*
    Open the file
  */
  if (cfgmbx[index]==TRUE) {
  /*
    Check the last touch of mailbox. Changed?
  */
    rc=stat(fnp1, &fst);
    if ( rc != 0 ) {
      /* 
        is it pop3, imap4 or nntp? 
      */
      rc = Mail_pop_imap_news(fnp1, num, unseen);
      if (rc == 0) {
            free(fnp1);
			return 0;
		}
      else
	cfgmbx[index] = FALSE; /* don't try again */
	
      error ("Error getting stat of Mailbox%d", index);
      return (-1);
    }
    if ( mbxlt[index] != fst.st_mtime ) {
      mbxlt[index]=fst.st_mtime;

      fstr=fopen(fnp1,"r");
      if (fstr != NULL) {
        txt=&txt1[0];
        last_line_blank1=TRUE;
        v1=0;

        while ( ( fgets ( txt1, 100, fstr ) ) != NULL ) {
          txt1[strlen(txt1)-1]='\0';                 // cut the newline
       	  /*
	    Is there a "From ..." line. Count only, if a blank line was directly before this
	  */
          if ( strncmp (txt1, "From ", 5 ) == 0 ) {
            if ( last_line_blank1 == TRUE ) {
              v1++;
              last_line_blank1 = FALSE;
            }
          }
          if ( strlen (txt1) == 0 ) {
  	    last_line_blank1 = TRUE;
          }
          else {
  	    last_line_blank1 = FALSE;
          }
        }
        fclose (fstr);
      }
    }
  }
  free(fnp1);
  /* FIXME look at the Status of Mails */
  *unseen = v1 - mbxnum[index];
  if (*unseen < 0)
    *unseen = 0;
  mbxnum[index]=v1;
  *num=v1;
  return (0);
}