git.pond.sub.org Git - empserver/blob - src/lib/update/anno.c

   1 /*
   2  *  Empire - A multi-player, client/server Internet based war game.
   3  *  Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                           Ken Stevens, Steve McClure
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ---
  21  *
  22  *  See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
  23  *  related information and legal notices. It is expected that any future
  24  *  projects/authors will amend these files as needed.
  25  *
  26  *  ---
  27  *
  28  *  anno.c: Delete announcements older than ANNO_KEEP_DAYS
  29  *
  30  *  Known contributors to this file:
  31  *     Ken Stevens, 1995
  32  *     Doug Hay, 1998
  33  *     Steve McClure, 2000
  34  */
  35
  36 #include "misc.h"
  37 #include "tel.h"
  38 #include <stdio.h>
  39 #include <fcntl.h>
  40 #if !defined(_WIN32)
  41 #include <sys/file.h>
  42 #include <unistd.h>
  43 #endif
  44 #include "update.h"
  45 #include "common.h"
  46
  47 void
  48 delete_old_announcements(void)
  49 {
  50         time_t  now;
  51         time_t  old;
  52         struct  telstr tgm;
  53         FILE   *oldfp;
  54         int     tmpfd;
  55         s_char  tmp_filename[1024];
  56         int     writeit;
  57         s_char  message[MAXTELSIZE];
  58         int     deleted = 0;
  59         int     saved = 0;
  60         int     length;
  61         int     nbytes;
  62         int     first = 1;
  63
  64         time(&now);
  65         old = now - days(ANNO_KEEP_DAYS);
  66         logerror("Deleting annos older than %s", ctime(&old));
  67
  68 #if !defined(_WIN32)
  69         if ((oldfp = fopen(annfil, "r+")) == 0) {
  70 #else
  71         if ((oldfp = fopen(annfil, "r+b")) == 0) {
  72 #endif
  73                 logerror("can't read telegram file %s", annfil);
  74                 return;
  75         }
  76         sprintf(tmp_filename, "%s.tmp", annfil);
  77 #if !defined(_WIN32)
  78         if ((tmpfd = open(tmp_filename, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) {
  79 #else
  80         if ((tmpfd = open(tmp_filename, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0666)) < 0) {
  81 #endif
  82                 logerror("can't write telegram file %s", tmp_filename);
  83                 return;
  84         }
  85         while (fread((s_char *) &tgm, sizeof(tgm), 1, oldfp) == 1) {
  86                 writeit = 1;
  87                 if (tgm.tel_length < 0) {
  88                         logerror("bad telegram file header (length)");
  89                         return;
  90                 }
  91                 if (tgm.tel_type < 0 || tgm.tel_type > TEL_LAST) {
  92                         logerror("bad telegram file header (type)");
  93                         writeit = 0;
  94                 }
  95                 if (first) {
  96                         first = 0;
  97                         if (tgm.tel_date >= old) {
  98                                 fclose(oldfp);
  99                                 return;
 100                         }
 101                 }
 102
 103                 if (tgm.tel_date < old) {
 104                         writeit = 0;
 105                 }
 106
 107                 if (writeit) {
 108                         if (write(tmpfd, &tgm, sizeof(tgm)) < (int)sizeof(tgm)) {
 109                                 logerror("error writing to ann.tmp");
 110                                 return;
 111                         }
 112                         ++saved;
 113                 } else {
 114                         ++deleted;
 115                 }
 116                 length = tgm.tel_length;
 117                 while (length > 0) {
 118                         nbytes = length;
 119                         if (nbytes > (int)sizeof(message))
 120                                 nbytes = sizeof(message);
 121                         (void) fread(message, sizeof(s_char), nbytes, oldfp);
 122                         if (writeit) {
 123                                 if (write(tmpfd, message, nbytes) < nbytes) {
 124                                         logerror("Error writing to ann.tmp");
 125                                         return;
 126                                 }
 127                         }
 128                         length -= nbytes;
 129                 }
 130         }
 131         logerror("%d announcements deleted; %d announcements saved",
 132                  deleted, saved);
 133         fclose(oldfp);
 134         close(tmpfd);
 135         unlink(annfil);
 136         rename(tmp_filename, annfil);
 137 }