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 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             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             if (0 != (retval = tend_land(&tender, p)))
 103                 return retval;
 104             continue;
 105         }
 106         sprintf(prompt, "Number of %s to tend from %s? ",
 107                 ip->i_name, prship(&tender));
 108         p = getstarg(player->argp[3], prompt, buf);
 109         if (!p)
 110             return RET_FAIL;
 111         if (!*p)
 112             continue;
 113         if (!check_ship_ok(&tender))
 114             return RET_SYN;
 115         if (!(amt = atoi(p))) {
 116             pr("Amount must be non-zero!\n");
 117             return RET_SYN;
 118         }
 119         ontender = tender.shp_item[ip->i_uid];
 120         if (ontender == 0 && 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 (!player->owner
 138                 && relations_with(target.shp_own, player->cnum) < FRIENDLY)
 139                 continue;
 140             if (target.shp_uid == tender.shp_uid)
 141                 continue;
 142             if (tender.shp_x != target.shp_x ||
 143                 tender.shp_y != target.shp_y)
 144                 continue;
 145             if (ip->i_uid == I_CIVIL && tender.shp_own != target.shp_own)
 146                 continue;
 147             ontarget = target.shp_item[ip->i_uid];
 148             vbase = &mchr[(int)target.shp_type];
 149             maxtarget = vbase->m_item[ip->i_uid];
 150             if (amt < 0) {
 151                 /* take from target and give to tender */
 152                 if (!player->owner)
 153                     continue;
 154                 if (ontarget == 0) {
 155                     pr("No %s on %s\n", ip->i_name, prship(&target));
 156                     continue;
 157                 }
 158                 transfer = MIN(ontarget, -amt);
 159                 transfer = MIN(maxtender - ontender, transfer);
 160                 if (transfer == 0)
 161                     continue;
 162                 target.shp_item[ip->i_uid] = ontarget - transfer;
 163                 ontender += transfer;
 164                 total += transfer;
 165             } else {
 166                 /* give to target from tender */
 167                 transfer = MIN(ontender, amt);
 168                 transfer = MIN(transfer, maxtarget - ontarget);
 169                 if (transfer == 0)
 170                     continue;
 171                 target.shp_item[ip->i_uid] = ontarget + transfer;
 172                 ontender -= transfer;
 173                 total += transfer;
 174                 if (transfer && target.shp_own != player->cnum) {
 175                     wu(0, target.shp_own, "%s tended %d %s to %s\n",
 176                        cname(player->cnum), total, ip->i_name,
 177                        prship(&target));
 178                 }
 179             }
 180             expose_ship(&tender, &target);
 181             putship(target.shp_uid, &target);
 182             if (amt > 0 && ontender == 0) {
 183                 pr("%s out of %s\n", prship(&tender), ip->i_name);
 184                 break;
 185             }
 186         }
 187         pr("%d total %s transferred %s %s\n",
 188            total, ip->i_name, (amt > 0) ? "off of" : "to",
 189            prship(&tender));
 190         tender.shp_item[ip->i_uid] = ontender;
 191         tender.shp_mission = 0;
 192         putship(tender.shp_uid, &tender);
 193     }
 194     return RET_OK;
 195 }
 196
 197 static void
 198 expose_ship(struct shpstr *s1, struct shpstr *s2)
 199 {
 200     if (s1->shp_pstage == PLG_INFECT && s2->shp_pstage == PLG_HEALTHY)
 201         s2->shp_pstage = PLG_EXPOSED;
 202     if (s2->shp_pstage == PLG_INFECT && s1->shp_pstage == PLG_HEALTHY)
 203         s1->shp_pstage = PLG_EXPOSED;
 204 }
 205
 206 static int
 207 tend_land(struct shpstr *tenderp, char *units)
 208 {
 209     struct nstr_item lni;
 210     struct nstr_item targets;
 211     struct shpstr target;
 212     struct lndstr land;
 213     char buf[1024];
 214
 215     if (!snxtitem(&lni, EF_LAND, units, NULL))
 216         return RET_SYN;
 217
 218     while (nxtitem(&lni, &land)) {
 219         if (!player->owner) {
 220             if (lni.sel == NS_LIST)
 221                 pr("You don't own land unit #%d!\n", land.lnd_uid);
 222             continue;
 223         }
 224         if (land.lnd_ship != tenderp->shp_uid) {
 225             if (lni.sel == NS_LIST)
 226                 pr("%s is not on %s!\n", prland(&land), prship(tenderp));
 227             continue;
 228         }
 229         if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
 230             pr("%s does not have \"assault\" capability and can't be tended\n",
 231                prland(&land));
 232             continue;
 233         }
 234         if (!snxtitem(&targets, EF_SHIP,
 235                       player->argp[4], "Ship to be tended? "))
 236             return RET_FAIL;
 237         if (!check_ship_ok(tenderp) || !check_land_ok(&land))
 238             return RET_SYN;
 239         while (nxtitem(&targets, &target)) {
 240             if (!player->owner
 241                 && relations_with(target.shp_own, player->cnum) < FRIENDLY)
 242                 continue;
 243             if (target.shp_uid == tenderp->shp_uid)
 244                 continue;
 245             if (tenderp->shp_x != target.shp_x ||
 246                 tenderp->shp_y != target.shp_y)
 247                 continue;
 248
 249             /* Fit unit on ship */
 250             getship(target.shp_uid, &target);
 251
 252             if ((!(lchr[(int)land.lnd_type].l_flags & L_LIGHT)) &&
 253                 (!((mchr[(int)target.shp_type].m_flags & M_SUPPLY) &&
 254                    (!(mchr[(int)target.shp_type].m_flags & M_SUB))))) {
 255                 pr("You can only load light units onto ships,\n"
 256                    "unless the ship is a non-sub supply ship\n"
 257                    "%s not tended\n", prland(&land));
 258                 continue;
 259             }
 260
 261             if ((mchr[(int)target.shp_type].m_flags & M_SUB) &&
 262                 (lchr[(int)land.lnd_type].l_flags & L_SPY) &&
 263                 !mchr[(int)target.shp_type].m_nland) {
 264                 if (shp_nland(&target) > 1) {
 265                     pr("%s doesn't have room for more than two spy units!\n",
 266                        prship(&target));
 267                     continue;
 268                 }
 269             } else if (shp_nland(&target) >= mchr[target.shp_type].m_nland) {
 270                 if (mchr[(int)target.shp_type].m_nland)
 271                     pr("%s doesn't have room for any more land units!\n",
 272                        prship(&target));
 273                 else
 274                     pr("%s doesn't carry land units!\n", prship(&target));
 275                 continue;
 276             }
 277             pr("%s transferred from %s to %s\n",
 278                prland(&land), prship(tenderp), prship(&target));
 279             sprintf(buf, "loaded on your %s at %s",
 280                     prship(&target), xyas(target.shp_x, target.shp_y,
 281                                           target.shp_own));
 282             gift(target.shp_own, player->cnum, &land, buf);
 283             land.lnd_ship = target.shp_uid;
 284             land.lnd_harden = 0;
 285             putland(land.lnd_uid, &land);
 286             expose_ship(tenderp, &target);
 287             putship(target.shp_uid, &target);
 288             putship(tenderp->shp_uid, tenderp);
 289             break;
 290         }
 291     }
 292     return 0;
 293 }