git.pond.sub.org Git - empserver/blob - src/lib/commands/tend.c

   1 /*
   2  *  Empire - A multi-player, client/server Internet based war game.
   3  *  Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                Ken Stevens, Steve McClure, Markus Armbruster
   5  *
   6  *  Empire 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 3 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, see <http://www.gnu.org/licenses/>.
  18  *
  19  *  ---
  20  *
  21  *  See files README, COPYING and CREDITS in the root of the source
  22  *  tree for related information and legal notices.  It is expected
  23  *  that future projects/authors will amend these files as needed.
  24  *
  25  *  ---
  26  *
  27  *  tend.c: Transfer goodies from one ship to another.
  28  *
  29  *  Known contributors to this file:
  30  *     Dave Pare, 1986
  31  *     Thomas Ruschak, 1992
  32  *     Steve McClure, 2000
  33  *     Markus Armbruster, 2004-2011
  34  */
  35
  36 #include <config.h>
  37
  38 #include "commands.h"
  39 #include "item.h"
  40 #include "land.h"
  41 #include "plague.h"
  42 #include "ship.h"
  43
  44 static void expose_ship(struct shpstr *s1, struct shpstr *s2);
  45 static int tend_land(struct shpstr *tenderp, char *units);
  46
  47 int
  48 tend(void)
  49 {
  50     struct nstr_item targets;
  51     struct nstr_item tenders;
  52     struct shpstr tender;
  53     struct shpstr target;
  54     struct ichrstr *ip;
  55     struct mchrstr *vbase;
  56     int amt;
  57     int retval;
  58     int ontender;
  59     int ontarget;
  60     int maxtender;
  61     int maxtarget;
  62     int transfer;
  63     int total;
  64     int type;
  65     char *p;
  66     char prompt[512];
  67     char buf[1024];
  68
  69     p = getstarg(player->argp[1], "Tend what commodity (or 'land')? ",
  70                  buf);
  71     if (!p || !*p)
  72         return RET_SYN;
  73
  74     if (!strncmp(p, "land", 4))
  75         type = EF_LAND;
  76     else if (NULL != (ip = item_by_name(p)))
  77         type = EF_SECTOR;
  78     else {
  79         pr("Can't tend '%s'\n", p);
  80         return RET_SYN;
  81     }
  82
  83     if (!snxtitem(&tenders, EF_SHIP, player->argp[2], "Tender(s)? "))
  84         return RET_SYN;
  85
  86     while (nxtitem(&tenders, &tender)) {
  87         if (!player->owner)
  88             continue;
  89         if (type == EF_LAND) {
  90             sprintf(prompt, "Land unit(s) to tend from %s? ",
  91                     prship(&tender));
  92             p = getstarg(player->argp[3], prompt, buf);
  93             if (!p)
  94                 return RET_FAIL;
  95             if (!*p)
  96                 continue;
  97             if (!check_ship_ok(&tender))
  98                 return RET_SYN;
  99             if (0 != (retval = tend_land(&tender, p)))
 100                 return retval;
 101             continue;
 102         }
 103         sprintf(prompt, "Number of %s to tend from %s? ",
 104                 ip->i_name, prship(&tender));
 105         p = getstarg(player->argp[3], prompt, buf);
 106         if (!p)
 107             return RET_FAIL;
 108         if (!*p)
 109             continue;
 110         if (!check_ship_ok(&tender))
 111             return RET_SYN;
 112         if (!(amt = atoi(p))) {
 113             pr("Amount must be non-zero!\n");
 114             return RET_SYN;
 115         }
 116         ontender = tender.shp_item[ip->i_uid];
 117         if (ontender == 0 && amt > 0) {
 118             pr("No %s on %s\n", ip->i_name, prship(&tender));
 119             return RET_FAIL;
 120         }
 121         vbase = &mchr[(int)tender.shp_type];
 122         maxtender = vbase->m_item[ip->i_uid];
 123         if (maxtender == 0) {
 124             pr("A %s cannot hold any %s\n",
 125                mchr[(int)tender.shp_type].m_name, ip->i_name);
 126             break;
 127         }
 128         if (!snxtitem(&targets, EF_SHIP,
 129                       player->argp[4], "Ships to be tended? "))
 130             return RET_FAIL;
 131         if (!check_ship_ok(&tender))
 132             return RET_SYN;
 133         total = 0;
 134         while (nxtitem(&targets, &target)) {
 135             if (!player->owner
 136                 && relations_with(target.shp_own, player->cnum) < FRIENDLY)
 137                 continue;
 138             if (target.shp_uid == tender.shp_uid)
 139                 continue;
 140             if (tender.shp_x != target.shp_x ||
 141                 tender.shp_y != target.shp_y)
 142                 continue;
 143             ontarget = target.shp_item[ip->i_uid];
 144             if (ontarget == 0 && amt < 0) {
 145                 pr("No %s on %s\n", ip->i_name, prship(&target));
 146                 continue;
 147             }
 148             vbase = &mchr[(int)target.shp_type];
 149             maxtarget = vbase->m_item[ip->i_uid];
 150             if (amt < 0) {
 151                 if (!player->owner)
 152                     amt = 0;
 153
 154                 /* take from target and give to tender */
 155                 transfer = MIN(ontarget, -amt);
 156                 transfer = MIN(maxtender - ontender, transfer);
 157                 if (transfer == 0)
 158                     continue;
 159                 target.shp_item[ip->i_uid] = ontarget - transfer;
 160                 ontender += transfer;
 161                 total += transfer;
 162             } else {
 163                 /* give to target from tender */
 164                 transfer = MIN(ontender, amt);
 165                 transfer = MIN(transfer, maxtarget - ontarget);
 166                 if (transfer == 0)
 167                     continue;
 168                 target.shp_item[ip->i_uid] = ontarget + transfer;
 169                 ontender -= transfer;
 170                 total += transfer;
 171                 if (transfer && target.shp_own != player->cnum) {
 172                     wu(0, target.shp_own, "%s tended %d %s to %s\n",
 173                        cname(player->cnum), total, ip->i_name,
 174                        prship(&target));
 175                 }
 176             }
 177             expose_ship(&tender, &target);
 178             putship(target.shp_uid, &target);
 179             if (amt > 0 && ontender == 0) {
 180                 pr("%s out of %s\n", prship(&tender), ip->i_name);
 181                 break;
 182             }
 183         }
 184         pr("%d total %s transferred %s %s\n",
 185            total, ip->i_name, (amt > 0) ? "off of" : "to",
 186            prship(&tender));
 187         tender.shp_item[ip->i_uid] = ontender;
 188         tender.shp_mission = 0;
 189         putship(tender.shp_uid, &tender);
 190     }
 191     return RET_OK;
 192 }
 193
 194 static void
 195 expose_ship(struct shpstr *s1, struct shpstr *s2)
 196 {
 197     if (s1->shp_pstage == PLG_INFECT && s2->shp_pstage == PLG_HEALTHY)
 198         s2->shp_pstage = PLG_EXPOSED;
 199     if (s2->shp_pstage == PLG_INFECT && s1->shp_pstage == PLG_HEALTHY)
 200         s1->shp_pstage = PLG_EXPOSED;
 201 }
 202
 203 static int
 204 tend_land(struct shpstr *tenderp, char *units)
 205 {
 206     struct nstr_item lni;
 207     struct nstr_item targets;
 208     struct shpstr target;
 209     struct lndstr land;
 210     char buf[1024];
 211
 212     if (!snxtitem(&lni, EF_LAND, units, NULL))
 213         return RET_SYN;
 214
 215     while (nxtitem(&lni, &land)) {
 216         if (!player->owner)
 217             continue;
 218         if (land.lnd_ship != tenderp->shp_uid) {
 219             pr("%s is not on %s!\n", prland(&land), prship(tenderp));
 220             continue;
 221         }
 222         if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
 223             pr("%s does not have \"assault\" capability and can't be tended\n",
 224                prland(&land));
 225             continue;
 226         }
 227         if (!snxtitem(&targets, EF_SHIP,
 228                       player->argp[4], "Ship to be tended? "))
 229             return RET_FAIL;
 230         if (!check_ship_ok(tenderp) || !check_land_ok(&land))
 231             return RET_SYN;
 232         while (nxtitem(&targets, &target)) {
 233             if (!player->owner
 234                 && relations_with(target.shp_own, player->cnum) < FRIENDLY)
 235                 continue;
 236             if (target.shp_uid == tenderp->shp_uid)
 237                 continue;
 238             if (tenderp->shp_x != target.shp_x ||
 239                 tenderp->shp_y != target.shp_y)
 240                 continue;
 241
 242             /* Fit unit on ship */
 243             getship(target.shp_uid, &target);
 244
 245             if ((!(lchr[(int)land.lnd_type].l_flags & L_LIGHT)) &&
 246                 (!((mchr[(int)target.shp_type].m_flags & M_SUPPLY) &&
 247                    (!(mchr[(int)target.shp_type].m_flags & M_SUB))))) {
 248                 pr("You can only load light units onto ships,\n"
 249                    "unless the ship is a non-sub supply ship\n"
 250                    "%s not tended\n", prland(&land));
 251                 continue;
 252             }
 253
 254             if ((mchr[(int)target.shp_type].m_flags & M_SUB) &&
 255                 (lchr[(int)land.lnd_type].l_flags & L_SPY) &&
 256                 !mchr[(int)target.shp_type].m_nland) {
 257                 if (shp_nland(&target) > 1) {
 258                     pr("%s doesn't have room for more than two spy units!\n",
 259                        prship(&target));
 260                     continue;
 261                 }
 262             } else if (shp_nland(&target) >= mchr[target.shp_type].m_nland) {
 263                 if (mchr[(int)target.shp_type].m_nland)
 264                     pr("%s doesn't have room for any more land units!\n",
 265                        prship(&target));
 266                 else
 267                     pr("%s doesn't carry land units!\n", prship(&target));
 268                 continue;
 269             }
 270             pr("%s transferred from %s to %s\n",
 271                prland(&land), prship(tenderp), prship(&target));
 272             sprintf(buf, "loaded on your %s at %s",
 273                     prship(&target), xyas(target.shp_x, target.shp_y,
 274                                           target.shp_own));
 275             gift(target.shp_own, player->cnum, &land, buf);
 276             land.lnd_ship = target.shp_uid;
 277             land.lnd_harden = 0;
 278             putland(land.lnd_uid, &land);
 279             expose_ship(tenderp, &target);
 280             putship(target.shp_uid, &target);
 281             putship(tenderp->shp_uid, tenderp);
 282         }
 283     }
 284     return 0;
 285 }