git.pond.sub.org Git - empserver/blob - src/lib/commands/lten.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  *  lten.c: Transfer commodity from a ship to a land unit the ship is
  29  *          carrying
  30  *
  31  *  Known contributors to this file:
  32  *     Dave Pare, 1986
  33  *     Thomas Ruschak
  34  *     Ken Stevens, 1995
  35  *     Steve McClure, 1998
  36  */
  37
  38 #include "misc.h"
  39 #include "player.h"
  40 #include "var.h"
  41 #include "xy.h"
  42 #include "file.h"
  43 #include "ship.h"
  44 #include "item.h"
  45 #include "nsc.h"
  46 #include "nat.h"
  47 #include "plane.h"
  48 #include "nuke.h"
  49 #include "land.h"
  50 #include "genitem.h"
  51 #include "commands.h"
  52
  53 static void expose_land(struct shpstr *s1, struct lndstr *l1);
  54
  55 int
  56 ltend(void)
  57 {
  58         struct  nstr_item       targets;
  59         struct  nstr_item       tenders;
  60         struct  shpstr  tender;
  61         struct  lndstr  target;
  62         struct  ichrstr *ip;
  63         struct  mchrstr *vbase;
  64         struct  lchrstr *lbase;
  65         int     amt;
  66         int     ontender;
  67         int     ontarget;
  68         int     maxtender;
  69         int     maxtarget;
  70         int     transfer;
  71         int     total;
  72         s_char  *p;
  73         s_char  buf[1024];
  74
  75         if (!(ip = whatitem(player->argp[1], "Transfer what commodity? ")))
  76                 return RET_SYN;
  77
  78         if (!snxtitem(&tenders, EF_SHIP, getstarg(player->argp[2], "Tender(s)? ", buf)))
  79                 return RET_SYN;
  80         while (nxtitem(&tenders, (s_char *)&tender)) {
  81                 if (!player->owner)
  82                         continue;
  83                 if ((p = getstarg(player->argp[3], "Amount to transfer? ", buf)) == 0)
  84                         break;
  85                 if (!check_ship_ok(&tender))
  86                     return RET_FAIL;
  87                 if ((amt = atoi(p)) == 0)
  88                         break;
  89                 ontender = getvar(ip->i_vtype, (s_char *)&tender, EF_SHIP);
  90                 if (ontender == 0 && amt > 0) {
  91                         pr("No %s on %s\n", ip->i_name, prship(&tender));
  92                         return RET_FAIL;
  93                 }
  94                 vbase = &mchr[(int)tender.shp_type];
  95                 maxtender = vl_find(ip->i_vtype, vbase->m_vtype,
  96                         vbase->m_vamt, (int)vbase->m_nv);
  97                 if (maxtender == 0) {
  98                         pr("A %s cannot hold any %s\n",
  99                                mchr[(int)tender.shp_type].m_name,
 100                                ip->i_name);
 101                         break;
 102                 }
 103                 if (!snxtitem(&targets, EF_LAND,
 104                     getstarg(player->argp[4], "Units to be tended? ", buf)))
 105                         break;
 106                 if (!check_ship_ok(&tender))
 107                     return RET_FAIL;
 108                 total = 0;
 109                 while (tend_nxtitem(&targets, (s_char *)&target)) {
 110                         if (!player->owner)
 111                                 continue;
 112
 113                         if (target.lnd_ship != tender.shp_uid)
 114                                 continue;
 115                         ontarget = getvar(ip->i_vtype,(s_char *)&target, EF_LAND);
 116                         if (ontarget == 0 && amt < 0) {
 117                                 pr("No %s on %s\n",
 118                                         ip->i_name, prship((struct shpstr *)&target));
 119                                 continue;
 120                         }
 121                         lbase = &lchr[(int)target.lnd_type];
 122                         maxtarget = vl_find(ip->i_vtype, lbase->l_vtype,
 123                                 lbase->l_vamt, (int)lbase->l_nv);
 124                         if (amt < 0) {
 125                                 if (!player->owner)
 126                                         amt=0;
 127
 128                                 /* take from target and give to tender */
 129                                 transfer = min(ontarget, -amt);
 130                                 transfer = min(maxtender - ontender, transfer);
 131                                 if (transfer == 0)
 132                                         continue;
 133                                 putvar(ip->i_vtype, ontarget - transfer,
 134                                         (s_char *)&target, EF_LAND);
 135                                 ontender += transfer;
 136                                 total += transfer;
 137                         } else {
 138                                 /* give to target from tender */
 139                                 transfer = min(ontender, amt);
 140                                 transfer = min(transfer, maxtarget - ontarget);
 141                                 if (transfer == 0)
 142                                         continue;
 143                                 putvar(ip->i_vtype, ontarget + transfer,
 144                                         (s_char *)&target, EF_LAND);
 145                                 ontender -= transfer;
 146                                 total += transfer;
 147                         }
 148                         expose_land(&tender, &target);
 149                         putland(target.lnd_uid, &target);
 150                         if (amt > 0 && ontender == 0) {
 151                                 pr("%s out of %s\n", prship(&tender),
 152                                    ip->i_name);
 153                                 break;
 154                         }
 155                 }
 156                 pr("%d total %s transferred %s %s\n",
 157                    total, ip->i_name, (amt > 0) ? "off of" : "to",
 158                    prship(&tender));
 159                 putvar(ip->i_vtype, ontender, (s_char *)&tender, EF_SHIP);
 160                 tender.shp_mission = 0;
 161                 putship(tender.shp_uid, &tender);
 162         }
 163         return RET_OK;
 164 }
 165
 166 static void
 167 expose_land(struct shpstr *s1, struct lndstr *l1)
 168 {
 169         if (getvar(V_PSTAGE, (s_char *)s1, EF_SHIP) == PLG_INFECT &&
 170             getvar(V_PSTAGE, (s_char *)l1, EF_LAND) == PLG_HEALTHY)
 171                 putvar(V_PSTAGE, PLG_EXPOSED, (s_char *)l1, EF_LAND);
 172         if (getvar(V_PSTAGE, (s_char *)l1, EF_LAND) == PLG_INFECT &&
 173             getvar(V_PSTAGE, (s_char *)s1, EF_SHIP) == PLG_HEALTHY)
 174                 putvar(V_PSTAGE, PLG_EXPOSED, (s_char *)s1, EF_SHIP);
 175 }