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) 1986-2018, 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, 2004-2017
  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 int can_tend_to(struct shpstr *, struct shpstr *);
  45 static void expose_ship(struct shpstr *s1, struct shpstr *s2);
  46 static int tend_land(struct shpstr *tenderp, char *units);
  47
  48 int
  49 tend(void)
  50 {
  51     struct nstr_item targets;
  52     struct nstr_item tenders;
  53     struct shpstr tender;
  54     struct shpstr target;
  55     struct ichrstr *ip;
  56     struct mchrstr *vbase;
  57     int amt;
  58     int retval;
  59     int ontender;
  60     int ontarget;
  61     int maxtender;
  62     int maxtarget;
  63     int transfer;
  64     int total;
  65     int type;
  66     char *p;
  67     char prompt[512];
  68     char buf[1024];
  69
  70     p = getstarg(player->argp[1], "Tend what commodity (or 'land')? ",
  71                  buf);
  72     if (!p || !*p)
  73         return RET_SYN;
  74
  75     if (!strncmp(p, "land", 4))
  76         type = EF_LAND;
  77     else if (NULL != (ip = item_by_name(p)))
  78         type = EF_SECTOR;
  79     else {
  80         pr("Can't tend '%s'\n", p);
  81         return RET_SYN;
  82     }
  83
  84     if (!snxtitem(&tenders, EF_SHIP, player->argp[2], "Tender(s)? "))
  85         return RET_SYN;
  86
  87     while (nxtitem(&tenders, &tender)) {
  88         if (!player->owner) {
  89             if (tenders.sel == NS_LIST)
  90                 pr("You don't own ship #%d!\n", tender.shp_uid);
  91             continue;
  92         }
  93         if (type == EF_LAND) {
  94             sprintf(prompt, "Land unit(s) to tend from %s? ",
  95                     prship(&tender));
  96             p = getstarg(player->argp[3], prompt, buf);
  97             if (!p)
  98                 return RET_FAIL;
  99             if (!*p)
 100                 continue;
 101             if (!check_ship_ok(&tender))
 102                 return RET_SYN;
 103             if (0 != (retval = tend_land(&tender, p)))
 104                 return retval;
 105             continue;
 106         }
 107         sprintf(prompt, "Number of %s to tend from %s? ",
 108                 ip->i_name, prship(&tender));
 109         p = getstarg(player->argp[3], prompt, buf);
 110         if (!p)
 111             return RET_FAIL;
 112         if (!*p)
 113             continue;
 114         if (!check_ship_ok(&tender))
 115             return RET_SYN;
 116         if (!(amt = atoi(p))) {
 117             pr("Amount must be non-zero!\n");
 118             return RET_SYN;
 119         }
 120         ontender = tender.shp_item[ip->i_uid];
 121         if (ontender == 0 && amt > 0) {
 122             pr("No %s on %s\n", ip->i_name, prship(&tender));
 123             continue;
 124         }
 125         vbase = &mchr[(int)tender.shp_type];
 126         maxtender = vbase->m_item[ip->i_uid];
 127         if (maxtender == 0) {
 128             pr("%s cannot hold any %s\n", prship(&tender), ip->i_name);
 129             continue;
 130         }
 131         if (!snxtitem(&targets, EF_SHIP,
 132                       player->argp[4], "Ships to be tended? "))
 133             return RET_FAIL;
 134         if (!check_ship_ok(&tender))
 135             return RET_SYN;
 136         total = 0;
 137         while (nxtitem(&targets, &target)) {
 138             if (ip->i_uid == I_CIVIL && tender.shp_own != target.shp_own)
 139                 continue;
 140             if (amt < 0) {
 141                 /* take from target and give to tender */
 142                 if (!player->owner)
 143                     continue;
 144                 if (!can_tend_to(&target, &tender))
 145                     continue;
 146                 ontarget = target.shp_item[ip->i_uid];
 147                 if (ontarget == 0) {
 148                     pr("No %s on %s\n", ip->i_name, prship(&target));
 149                     continue;
 150                 }
 151                 transfer = MIN(ontarget, -amt);
 152                 transfer = MIN(maxtender - ontender, transfer);
 153                 if (transfer == 0)
 154                     continue;
 155                 target.shp_item[ip->i_uid] = ontarget - transfer;
 156                 ontender += transfer;
 157                 total += transfer;
 158             } else {
 159                 /* give to target from tender */
 160                 if (!can_tend_to(&tender, &target))
 161                     continue;
 162                 ontarget = target.shp_item[ip->i_uid];
 163                 vbase = &mchr[(int)target.shp_type];
 164                 maxtarget = vbase->m_item[ip->i_uid];
 165                 transfer = MIN(ontender, amt);
 166                 transfer = MIN(transfer, maxtarget - ontarget);
 167                 if (transfer == 0)
 168                     continue;
 169                 target.shp_item[ip->i_uid] = ontarget + transfer;
 170                 ontender -= transfer;
 171                 total += transfer;
 172                 if (transfer && target.shp_own != player->cnum) {
 173                     wu(0, target.shp_own, "%s tended %d %s to %s\n",
 174                        cname(player->cnum), transfer, ip->i_name,
 175                        prship(&target));
 176                 }
 177             }
 178             expose_ship(&tender, &target);
 179             putship(target.shp_uid, &target);
 180             if (amt > 0 && ontender == 0) {
 181                 pr("%s out of %s\n", prship(&tender), ip->i_name);
 182                 break;
 183             }
 184         }
 185         pr("%d total %s transferred %s %s\n",
 186            total, ip->i_name, (amt > 0) ? "off of" : "to",
 187            prship(&tender));
 188         tender.shp_item[ip->i_uid] = ontender;
 189         tender.shp_mission = 0;
 190         putship(tender.shp_uid, &tender);
 191     }
 192     return RET_OK;
 193 }
 194
 195 static int
 196 can_tend_to(struct shpstr *from, struct shpstr *to)
 197 {
 198     if (to->shp_own != player->cnum && !player->god
 199         && relations_with(to->shp_own, player->cnum) < FRIENDLY)
 200         return 0;
 201     if (from->shp_uid == to->shp_uid)
 202         return 0;
 203     if (from->shp_x != to->shp_x || from->shp_y != to->shp_y)
 204         return 0;
 205     return 1;
 206 }
 207
 208 static void
 209 expose_ship(struct shpstr *s1, struct shpstr *s2)
 210 {
 211     if (s1->shp_pstage == PLG_INFECT && s2->shp_pstage == PLG_HEALTHY)
 212         s2->shp_pstage = PLG_EXPOSED;
 213     if (s2->shp_pstage == PLG_INFECT && s1->shp_pstage == PLG_HEALTHY)
 214         s1->shp_pstage = PLG_EXPOSED;
 215 }
 216
 217 static int
 218 tend_land(struct shpstr *tenderp, char *units)
 219 {
 220     struct nstr_item lni;
 221     struct nstr_item targets;
 222     struct shpstr target;
 223     struct lndstr land;
 224     char buf[1024];
 225
 226     if (!snxtitem(&lni, EF_LAND, units, NULL))
 227         return RET_SYN;
 228
 229     while (nxtitem(&lni, &land)) {
 230         if (!player->owner) {
 231             if (lni.sel == NS_LIST)
 232                 pr("You don't own land unit #%d!\n", land.lnd_uid);
 233             continue;
 234         }
 235         if (land.lnd_ship != tenderp->shp_uid) {
 236             if (lni.sel == NS_LIST)
 237                 pr("%s is not on %s!\n", prland(&land), prship(tenderp));
 238             continue;
 239         }
 240         if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
 241             pr("%s does not have \"assault\" capability and can't be tended\n",
 242                prland(&land));
 243             continue;
 244         }
 245         if (!snxtitem(&targets, EF_SHIP,
 246                       player->argp[4], "Ship to be tended? "))
 247             return RET_FAIL;
 248         if (!check_ship_ok(tenderp) || !check_land_ok(&land))
 249             return RET_SYN;
 250         while (nxtitem(&targets, &target)) {
 251             if (!can_tend_to(tenderp, &target))
 252                 continue;
 253
 254             /* Fit unit on ship */
 255             getship(target.shp_uid, &target);
 256
 257             if ((!(lchr[(int)land.lnd_type].l_flags & L_LIGHT)) &&
 258                 (!((mchr[(int)target.shp_type].m_flags & M_SUPPLY) &&
 259                    (!(mchr[(int)target.shp_type].m_flags & M_SUB))))) {
 260                 pr("You can only load light units onto ships,\n"
 261                    "unless the ship is a non-sub supply ship\n"
 262                    "%s not tended\n", prland(&land));
 263                 continue;
 264             }
 265
 266             if ((mchr[(int)target.shp_type].m_flags & M_SUB) &&
 267                 (lchr[(int)land.lnd_type].l_flags & L_SPY) &&
 268                 !mchr[(int)target.shp_type].m_nland) {
 269                 if (shp_nland(&target) > 1) {
 270                     pr("%s doesn't have room for more than two spy units!\n",
 271                        prship(&target));
 272                     continue;
 273                 }
 274             } else if (shp_nland(&target) >= mchr[target.shp_type].m_nland) {
 275                 if (mchr[(int)target.shp_type].m_nland)
 276                     pr("%s doesn't have room for any more land units!\n",
 277                        prship(&target));
 278                 else
 279                     pr("%s doesn't carry land units!\n", prship(&target));
 280                 continue;
 281             }
 282             pr("%s transferred from %s to %s\n",
 283                prland(&land), prship(tenderp), prship(&target));
 284             sprintf(buf, "loaded on your %s at %s",
 285                     prship(&target), xyas(target.shp_x, target.shp_y,
 286                                           target.shp_own));
 287             gift(target.shp_own, player->cnum, &land, buf);
 288             land.lnd_ship = target.shp_uid;
 289             land.lnd_harden = 0;
 290             putland(land.lnd_uid, &land);
 291             expose_ship(tenderp, &target);
 292             putship(target.shp_uid, &target);
 293             putship(tenderp->shp_uid, tenderp);
 294             break;
 295         }
 296     }
 297     return 0;
 298 }