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 *, int, struct shpstr *, int);
  45 static void expose_ship(struct shpstr *s1, struct shpstr *s2);
  46 static int tend_land(struct shpstr *tenderp, int, 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 || !tender.shp_own) {
  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             retval = tend_land(&tender, tenders.sel == NS_LIST, p);
 104             if (retval)
 105                 return retval;
 106             continue;
 107         }
 108         sprintf(prompt, "Number of %s to tend from %s? ",
 109                 ip->i_name, prship(&tender));
 110         p = getstarg(player->argp[3], prompt, buf);
 111         if (!p)
 112             return RET_FAIL;
 113         if (!*p)
 114             continue;
 115         if (!check_ship_ok(&tender))
 116             return RET_SYN;
 117         if (!(amt = atoi(p))) {
 118             pr("Amount must be non-zero!\n");
 119             return RET_SYN;
 120         }
 121         ontender = tender.shp_item[ip->i_uid];
 122         if (ontender == 0 && amt > 0) {
 123             pr("No %s on %s\n", ip->i_name, prship(&tender));
 124             continue;
 125         }
 126         vbase = &mchr[(int)tender.shp_type];
 127         maxtender = vbase->m_item[ip->i_uid];
 128         if (maxtender == 0) {
 129             pr("%s cannot hold any %s\n", prship(&tender), ip->i_name);
 130             continue;
 131         }
 132         if (!snxtitem(&targets, EF_SHIP,
 133                       player->argp[4], "Ships to be tended? "))
 134             return RET_FAIL;
 135         if (!check_ship_ok(&tender))
 136             return RET_SYN;
 137         total = 0;
 138         while (nxtitem(&targets, &target)) {
 139             if (amt < 0) {
 140                 /* take from target and give to tender */
 141                 if (!player->owner) {
 142                     if (targets.sel == NS_LIST)
 143                         pr("You don't own ship #%d!\n", target.shp_uid);
 144                     continue;
 145                 }
 146                 if (!can_tend_to(&target, targets.sel == NS_LIST,
 147                                  &tender, tenders.sel == NS_LIST))
 148                     continue;
 149                 ontarget = target.shp_item[ip->i_uid];
 150                 if (ontarget == 0) {
 151                     pr("No %s on %s\n", ip->i_name, prship(&target));
 152                     continue;
 153                 }
 154                 transfer = MIN(ontarget, -amt);
 155                 transfer = MIN(maxtender - ontender, transfer);
 156                 if (transfer == 0)
 157                     continue;
 158                 target.shp_item[ip->i_uid] = ontarget - transfer;
 159                 ontender += transfer;
 160                 total += transfer;
 161             } else {
 162                 /* give to target from tender */
 163                 if (!can_tend_to(&tender, tenders.sel == NS_LIST,
 164                                  &target, targets.sel == NS_LIST))
 165                     continue;
 166                 if (ip->i_uid == I_CIVIL && tender.shp_own != target.shp_own)
 167                     continue;
 168                 ontarget = target.shp_item[ip->i_uid];
 169                 vbase = &mchr[(int)target.shp_type];
 170                 maxtarget = vbase->m_item[ip->i_uid];
 171                 transfer = MIN(ontender, amt);
 172                 transfer = MIN(transfer, maxtarget - ontarget);
 173                 if (transfer == 0)
 174                     continue;
 175                 target.shp_item[ip->i_uid] = ontarget + transfer;
 176                 ontender -= transfer;
 177                 total += transfer;
 178                 if (transfer && target.shp_own != player->cnum) {
 179                     wu(0, target.shp_own, "%s tended %d %s to %s\n",
 180                        cname(player->cnum), transfer, ip->i_name,
 181                        prship(&target));
 182                 }
 183             }
 184             expose_ship(&tender, &target);
 185             putship(target.shp_uid, &target);
 186             if (amt > 0 && ontender == 0) {
 187                 pr("%s out of %s\n", prship(&tender), ip->i_name);
 188                 break;
 189             }
 190         }
 191         pr("%d total %s transferred %s %s\n",
 192            total, ip->i_name, (amt > 0) ? "off of" : "to",
 193            prship(&tender));
 194         tender.shp_item[ip->i_uid] = ontender;
 195         tender.shp_mission = 0;
 196         putship(tender.shp_uid, &tender);
 197     }
 198     return RET_OK;
 199 }
 200
 201 static int
 202 can_tend_to(struct shpstr *from, int noisy_from,
 203             struct shpstr *to, int noisy_to)
 204 {
 205     /*
 206      * Careful: error messages must not disclose anything on foreign
 207      * @to the player doesn't already know, or could trivially learn.
 208      */
 209     if (!to->shp_own) {
 210         if (noisy_to)
 211             pr("You don't own ship #%d!\n", to->shp_uid);
 212         return 0;
 213     }
 214     if (from->shp_uid == to->shp_uid) {
 215         if (noisy_from && noisy_to)
 216             pr("%s won't tend to itself\n", prship(from));
 217         return 0;
 218     }
 219     if (from->shp_x != to->shp_x || from->shp_y != to->shp_y) {
 220         if (noisy_from && noisy_to) {
 221             /* Don't disclose foreign @to exists elsewhere */
 222             if (player->god || to->shp_own == player->cnum)
 223                 pr("%s is not in the same sector as %s\n",
 224                    prship(to), prship(from));
 225             else
 226                 pr("You don't own ship #%d!\n", to->shp_uid);
 227         }
 228         return 0;
 229     }
 230     if (!player->god && to->shp_own != player->cnum
 231         && relations_with(to->shp_own, player->cnum) < FRIENDLY) {
 232         if (noisy_to) {
 233             /*
 234              * Don't disclose unfriendly @to exists here unless
 235              * lookout from @from would see it.
 236              */
 237             if ((mchr[from->shp_type].m_flags & M_SUB)
 238                 || (mchr[to->shp_type].m_flags & M_SUB))
 239                 pr("You don't own ship #%d!\n", from->shp_uid);
 240             else
 241                 pr("You are not on friendly terms with"
 242                    " the owner of ship #%d!\n",
 243                    to->shp_uid);
 244         }
 245         return 0;
 246     }
 247     return 1;
 248 }
 249
 250 static void
 251 expose_ship(struct shpstr *s1, struct shpstr *s2)
 252 {
 253     if (s1->shp_pstage == PLG_INFECT && s2->shp_pstage == PLG_HEALTHY)
 254         s2->shp_pstage = PLG_EXPOSED;
 255     if (s2->shp_pstage == PLG_INFECT && s1->shp_pstage == PLG_HEALTHY)
 256         s1->shp_pstage = PLG_EXPOSED;
 257 }
 258
 259 static int
 260 tend_land(struct shpstr *tenderp, int noisy, char *units)
 261 {
 262     struct nstr_item lni;
 263     struct nstr_item targets;
 264     struct shpstr target;
 265     struct lndstr land;
 266     char buf[1024];
 267
 268     if (!snxtitem(&lni, EF_LAND, units, NULL))
 269         return RET_SYN;
 270
 271     while (nxtitem(&lni, &land)) {
 272         if (!player->owner || !land.lnd_own) {
 273             if (lni.sel == NS_LIST)
 274                 pr("You don't own land unit #%d!\n", land.lnd_uid);
 275             continue;
 276         }
 277         if (land.lnd_ship != tenderp->shp_uid) {
 278             if (lni.sel == NS_LIST)
 279                 pr("%s is not on %s!\n", prland(&land), prship(tenderp));
 280             continue;
 281         }
 282         if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
 283             pr("%s does not have \"assault\" capability and can't be tended\n",
 284                prland(&land));
 285             continue;
 286         }
 287         if (!snxtitem(&targets, EF_SHIP,
 288                       player->argp[4], "Ship to be tended? "))
 289             return RET_FAIL;
 290         if (!check_ship_ok(tenderp) || !check_land_ok(&land))
 291             return RET_SYN;
 292         while (nxtitem(&targets, &target)) {
 293             if (!can_tend_to(tenderp, noisy,
 294                              &target, targets.sel == NS_LIST))
 295                 continue;
 296
 297             /* Fit unit on ship */
 298             getship(target.shp_uid, &target);
 299
 300             if ((!(lchr[(int)land.lnd_type].l_flags & L_LIGHT)) &&
 301                 (!((mchr[(int)target.shp_type].m_flags & M_SUPPLY) &&
 302                    (!(mchr[(int)target.shp_type].m_flags & M_SUB))))) {
 303                 pr("You can only load light units onto ships,\n"
 304                    "unless the ship is a non-sub supply ship\n"
 305                    "%s not tended\n", prland(&land));
 306                 continue;
 307             }
 308
 309             if ((mchr[(int)target.shp_type].m_flags & M_SUB) &&
 310                 (lchr[(int)land.lnd_type].l_flags & L_SPY) &&
 311                 !mchr[(int)target.shp_type].m_nland) {
 312                 if (shp_nland(&target) > 1) {
 313                     pr("%s doesn't have room for more than two spy units!\n",
 314                        prship(&target));
 315                     continue;
 316                 }
 317             } else if (shp_nland(&target) >= mchr[target.shp_type].m_nland) {
 318                 if (mchr[(int)target.shp_type].m_nland)
 319                     pr("%s doesn't have room for any more land units!\n",
 320                        prship(&target));
 321                 else
 322                     pr("%s doesn't carry land units!\n", prship(&target));
 323                 continue;
 324             }
 325             pr("%s transferred from %s to %s\n",
 326                prland(&land), prship(tenderp), prship(&target));
 327             sprintf(buf, "loaded on your %s at %s",
 328                     prship(&target), xyas(target.shp_x, target.shp_y,
 329                                           target.shp_own));
 330             gift(target.shp_own, player->cnum, &land, buf);
 331             land.lnd_ship = target.shp_uid;
 332             land.lnd_harden = 0;
 333             putland(land.lnd_uid, &land);
 334             expose_ship(tenderp, &target);
 335             putship(target.shp_uid, &target);
 336             putship(tenderp->shp_uid, tenderp);
 337             break;
 338         }
 339     }
 340     return 0;
 341 }