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) 1986-2021, 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 *, int, struct shpstr *, int);
  45 static int tend_comm_to(struct shpstr *, struct ichrstr *, int,
  46                         struct shpstr *);
  47 static void expose_ship(struct shpstr *s1, struct shpstr *s2);
  48 static int tend_land(struct shpstr *tenderp, int, char *units);
  49
  50 int
  51 c_tend(void)
  52 {
  53     struct nstr_item targets;
  54     struct nstr_item tenders;
  55     struct shpstr tender;
  56     struct shpstr target;
  57     struct ichrstr *ip;
  58     struct mchrstr *vbase;
  59     int amt;
  60     int retval;
  61     int maxtender;
  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 || !tender.shp_own) {
  88             if (tenders.sel == NS_LIST)
  89                 pr("You don't own ship #%d!\n", tender.shp_uid);
  90             continue;
  91         }
  92         if (type == EF_LAND) {
  93             sprintf(prompt, "Land unit(s) to tend from %s? ",
  94                     prship(&tender));
  95             p = getstarg(player->argp[3], prompt, buf);
  96             if (!p)
  97                 return RET_FAIL;
  98             if (!*p)
  99                 continue;
 100             if (!check_ship_ok(&tender))
 101                 return RET_SYN;
 102             retval = tend_land(&tender, tenders.sel == NS_LIST, p);
 103             if (retval)
 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         if (!tender.shp_item[ip->i_uid] && amt > 0) {
 121             pr("No %s on %s\n", ip->i_name, prship(&tender));
 122             continue;
 123         }
 124         vbase = &mchr[(int)tender.shp_type];
 125         maxtender = vbase->m_item[ip->i_uid];
 126         if (maxtender == 0) {
 127             pr("%s cannot hold any %s\n", prship(&tender), ip->i_name);
 128             continue;
 129         }
 130         if (!snxtitem(&targets, EF_SHIP,
 131                       player->argp[4], "Ships to be tended? "))
 132             return RET_FAIL;
 133         if (!check_ship_ok(&tender))
 134             return RET_SYN;
 135         total = 0;
 136         while (nxtitem(&targets, &target)) {
 137             if (amt > 0) {
 138                 if (!can_tend_to(&tender, tenders.sel == NS_LIST,
 139                                  &target, targets.sel == NS_LIST))
 140                     continue;
 141                 transfer = tend_comm_to(&tender, ip, amt, &target);
 142             } else {
 143                 if (!player->owner) {
 144                     if (targets.sel == NS_LIST)
 145                         pr("You don't own ship #%d!\n", target.shp_uid);
 146                     continue;
 147                 }
 148                 if (!can_tend_to(&target, targets.sel == NS_LIST,
 149                                  &tender, tenders.sel == NS_LIST))
 150                     continue;
 151                 transfer = tend_comm_to(&target, ip, -amt, &tender);
 152             }
 153             if (!transfer)
 154                 continue;
 155             total += transfer;
 156             expose_ship(&tender, &target);
 157             putship(target.shp_uid, &target);
 158             if (amt > 0 && !tender.shp_item[ip->i_uid]) {
 159                 pr("%s out of %s\n", prship(&tender), ip->i_name);
 160                 break;
 161             }
 162             if (amt < 0 && tender.shp_item[ip->i_uid] == maxtender)
 163                 break;
 164         }
 165         pr("%d total %s transferred %s %s\n",
 166            total, ip->i_name, (amt > 0) ? "off of" : "to",
 167            prship(&tender));
 168         tender.shp_mission = 0;
 169         putship(tender.shp_uid, &tender);
 170     }
 171     return RET_OK;
 172 }
 173
 174 static int
 175 can_tend_to(struct shpstr *from, int noisy_from,
 176             struct shpstr *to, int noisy_to)
 177 {
 178     /*
 179      * Careful: error messages must not disclose anything on foreign
 180      * @to the player doesn't already know, or could trivially learn.
 181      */
 182     if (!to->shp_own) {
 183         if (noisy_to)
 184             pr("You don't own ship #%d!\n", to->shp_uid);
 185         return 0;
 186     }
 187     if (from->shp_uid == to->shp_uid) {
 188         if (noisy_from && noisy_to)
 189             pr("%s won't tend to itself\n", prship(from));
 190         return 0;
 191     }
 192     if (from->shp_x != to->shp_x || from->shp_y != to->shp_y) {
 193         if (noisy_from && noisy_to) {
 194             /* Don't disclose foreign @to exists elsewhere */
 195             if (player->god || to->shp_own == player->cnum)
 196                 pr("%s is not in the same sector as %s\n",
 197                    prship(to), prship(from));
 198             else
 199                 pr("You don't own ship #%d!\n", to->shp_uid);
 200         }
 201         return 0;
 202     }
 203     if (!player->god && to->shp_own != player->cnum
 204         && relations_with(to->shp_own, player->cnum) < FRIENDLY) {
 205         if (noisy_to) {
 206             /*
 207              * Don't disclose unfriendly @to exists here unless
 208              * lookout from @from would see it.
 209              */
 210             if ((mchr[from->shp_type].m_flags & M_SUB)
 211                 || (mchr[to->shp_type].m_flags & M_SUB))
 212                 pr("You don't own ship #%d!\n", from->shp_uid);
 213             else
 214                 pr("You are not on friendly terms with"
 215                    " the owner of ship #%d!\n",
 216                    to->shp_uid);
 217         }
 218         return 0;
 219     }
 220     return 1;
 221 }
 222
 223 static int
 224 tend_comm_to(struct shpstr *from, struct ichrstr *ip, int amt,
 225              struct shpstr *to)
 226 {
 227     int can_give = from->shp_item[ip->i_uid];
 228     int to_max = mchr[to->shp_type].m_item[ip->i_uid];
 229     int can_take = to_max - to->shp_item[ip->i_uid];
 230     int transfer;
 231
 232     if (!to_max) {
 233         pr("%s cannot hold any %s\n", prship(to), ip->i_name);
 234         return 0;
 235     }
 236     if (ip->i_uid == I_CIVIL && from->shp_own != to->shp_own) {
 237         pr("%s civilians refuse to board %s!\n",
 238            from->shp_own == player->cnum ? "Your" : "Foreign",
 239            prship(to));
 240         return 0;
 241     }
 242     if (!can_give) {
 243         pr("No %s on %s\n", ip->i_name, prship(from));
 244         return 0;
 245     }
 246     if (!can_take) {
 247         pr("%s can't hold more %s\n", prship(to), ip->i_name);
 248         return 0;
 249     }
 250
 251     transfer = MIN(can_give, amt);
 252     transfer = MIN(can_take, transfer);
 253     from->shp_item[ip->i_uid] -= transfer;
 254     to->shp_item[ip->i_uid] += transfer;
 255     if (to->shp_own != player->cnum) {
 256         wu(0, to->shp_own, "%s tended %d %s to %s\n",
 257            cname(player->cnum), transfer, ip->i_name, prship(to));
 258     }
 259
 260     return transfer;
 261 }
 262
 263 static void
 264 expose_ship(struct shpstr *s1, struct shpstr *s2)
 265 {
 266     if (s1->shp_pstage == PLG_INFECT && s2->shp_pstage == PLG_HEALTHY)
 267         s2->shp_pstage = PLG_EXPOSED;
 268     if (s2->shp_pstage == PLG_INFECT && s1->shp_pstage == PLG_HEALTHY)
 269         s1->shp_pstage = PLG_EXPOSED;
 270 }
 271
 272 static int
 273 tend_land(struct shpstr *tenderp, int noisy, char *units)
 274 {
 275     struct nstr_item lni;
 276     struct nstr_item targets;
 277     struct shpstr target;
 278     struct lndstr land;
 279     char buf[1024];
 280
 281     if (!snxtitem(&lni, EF_LAND, units, NULL))
 282         return RET_SYN;
 283
 284     while (nxtitem(&lni, &land)) {
 285         if (!player->owner || !land.lnd_own) {
 286             if (lni.sel == NS_LIST)
 287                 pr("You don't own land unit #%d!\n", land.lnd_uid);
 288             continue;
 289         }
 290         if (land.lnd_ship != tenderp->shp_uid) {
 291             if (lni.sel == NS_LIST)
 292                 pr("%s is not on %s!\n", prland(&land), prship(tenderp));
 293             continue;
 294         }
 295         if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
 296             pr("%s does not have \"assault\" capability and can't be tended\n",
 297                prland(&land));
 298             continue;
 299         }
 300         if (!snxtitem(&targets, EF_SHIP,
 301                       player->argp[4], "Ship to be tended? "))
 302             return RET_FAIL;
 303         if (!check_ship_ok(tenderp) || !check_land_ok(&land))
 304             return RET_SYN;
 305         while (nxtitem(&targets, &target)) {
 306             if (!can_tend_to(tenderp, noisy,
 307                              &target, targets.sel == NS_LIST))
 308                 continue;
 309
 310             /* Fit unit on ship */
 311             getship(target.shp_uid, &target);
 312
 313             if ((!(lchr[(int)land.lnd_type].l_flags & L_LIGHT)) &&
 314                 (!((mchr[(int)target.shp_type].m_flags & M_SUPPLY) &&
 315                    (!(mchr[(int)target.shp_type].m_flags & M_SUB))))) {
 316                 pr("You can only load light units onto ships,\n"
 317                    "unless the ship is a non-sub supply ship\n"
 318                    "%s not tended\n", prland(&land));
 319                 continue;
 320             }
 321
 322             if ((mchr[(int)target.shp_type].m_flags & M_SUB) &&
 323                 (lchr[(int)land.lnd_type].l_flags & L_SPY) &&
 324                 !mchr[(int)target.shp_type].m_nland) {
 325                 if (shp_nland(&target) > 1) {
 326                     pr("%s doesn't have room for more than two spy units!\n",
 327                        prship(&target));
 328                     continue;
 329                 }
 330             } else if (shp_nland(&target) >= mchr[target.shp_type].m_nland) {
 331                 if (mchr[(int)target.shp_type].m_nland)
 332                     pr("%s doesn't have room for any more land units!\n",
 333                        prship(&target));
 334                 else
 335                     pr("%s doesn't carry land units!\n", prship(&target));
 336                 continue;
 337             }
 338             pr("%s transferred from %s to %s\n",
 339                prland(&land), prship(tenderp), prship(&target));
 340             sprintf(buf, "loaded on your %s at %s",
 341                     prship(&target), xyas(target.shp_x, target.shp_y,
 342                                           target.shp_own));
 343             gift(target.shp_own, player->cnum, &land, buf);
 344             land.lnd_ship = target.shp_uid;
 345             land.lnd_harden = 0;
 346             putland(land.lnd_uid, &land);
 347             expose_ship(tenderp, &target);
 348             putship(target.shp_uid, &target);
 349             putship(tenderp->shp_uid, tenderp);
 350             break;
 351         }
 352     }
 353     return 0;
 354 }