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) 1986-2007, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                           Ken Stevens, Steve McClure
   5  *
   6  *  This program 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 2 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, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ---
  21  *
  22  *  See files README, COPYING and CREDITS in the root of the source
  23  *  tree for related information and legal notices.  It is expected
  24  *  that future projects/authors will amend these files as needed.
  25  *
  26  *  ---
  27  *
  28  *  tend.c: Transfer goodies from one ship to another.
  29  *
  30  *  Known contributors to this file:
  31  *     Dave Pare, 1986
  32  *     Thomas Ruschak, 1992
  33  *     Steve McClure, 2000
  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 "plane.h"
  43 #include "ship.h"
  44
  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     if (!(p = getstarg(player->argp[1],
  71                        "Tend what commodity (or 'land')? ", buf)) || !*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,
  84                   getstarg(player->argp[2], "Tender(s)? ", buf)))
  85         return RET_SYN;
  86
  87     while (nxtitem(&tenders, &tender)) {
  88         if (!player->owner)
  89             continue;
  90         if (type == EF_LAND) {
  91             sprintf(prompt, "Land unit(s) to tend from %s? ",
  92                     prship(&tender));
  93             if (!(p = getstarg(player->argp[3], prompt, buf)) || !*p)
  94                 continue;
  95             if (!check_ship_ok(&tender))
  96                 return RET_SYN;
  97             if (0 != (retval = tend_land(&tender, p)))
  98                 return retval;
  99             continue;
 100         }
 101         sprintf(prompt, "Number of %s to tend from %s? ",
 102                 ip->i_name, prship(&tender));
 103         if (!(p = getstarg(player->argp[3], prompt, buf)) || !*p)
 104             continue;
 105         if (!check_ship_ok(&tender))
 106             return RET_SYN;
 107         if (!(amt = atoi(p))) {
 108             pr("Amount must be non-zero!\n");
 109             return RET_SYN;
 110         }
 111         ontender = tender.shp_item[ip->i_uid];
 112         if (ontender == 0 && amt > 0) {
 113             pr("No %s on %s\n", ip->i_name, prship(&tender));
 114             return RET_FAIL;
 115         }
 116         vbase = &mchr[(int)tender.shp_type];
 117         maxtender = vbase->m_item[ip->i_uid];
 118         if (maxtender == 0) {
 119             pr("A %s cannot hold any %s\n",
 120                mchr[(int)tender.shp_type].m_name, ip->i_name);
 121             break;
 122         }
 123         if (!snxtitem(&targets, EF_SHIP,
 124                       getstarg(player->argp[4], "Ships to be tended? ",
 125                                buf)))
 126             break;
 127         if (!check_ship_ok(&tender))
 128             return RET_SYN;
 129         total = 0;
 130         while (nxtitem(&targets, &target)) {
 131             if (!player->owner &&
 132                 (getrel(getnatp(target.shp_own), player->cnum) < FRIENDLY))
 133                 continue;
 134             if (target.shp_uid == tender.shp_uid)
 135                 continue;
 136             if (tender.shp_x != target.shp_x ||
 137                 tender.shp_y != target.shp_y)
 138                 continue;
 139             ontarget = target.shp_item[ip->i_uid];
 140             if (ontarget == 0 && amt < 0) {
 141                 pr("No %s on %s\n", ip->i_name, prship(&target));
 142                 continue;
 143             }
 144             vbase = &mchr[(int)target.shp_type];
 145             maxtarget = vbase->m_item[ip->i_uid];
 146             if (amt < 0) {
 147                 if (!player->owner)
 148                     amt = 0;
 149
 150                 /* take from target and give to tender */
 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                 transfer = MIN(ontender, amt);
 161                 transfer = MIN(transfer, maxtarget - ontarget);
 162                 if (transfer == 0)
 163                     continue;
 164                 target.shp_item[ip->i_uid] = ontarget + transfer;
 165                 ontender -= transfer;
 166                 total += transfer;
 167                 if (transfer && target.shp_own != player->cnum) {
 168                     wu(0, target.shp_own, "%s tended %d %s to %s\n",
 169                        cname(player->cnum), total, ip->i_name,
 170                        prship(&target));
 171                 }
 172             }
 173             expose_ship(&tender, &target);
 174             putship(target.shp_uid, &target);
 175             if (amt > 0 && ontender == 0) {
 176                 pr("%s out of %s\n", prship(&tender), ip->i_name);
 177                 break;
 178             }
 179         }
 180         pr("%d total %s transferred %s %s\n",
 181            total, ip->i_name, (amt > 0) ? "off of" : "to",
 182            prship(&tender));
 183         tender.shp_item[ip->i_uid] = ontender;
 184         tender.shp_mission = 0;
 185         putship(tender.shp_uid, &tender);
 186     }
 187     return RET_OK;
 188 }
 189
 190 static void
 191 expose_ship(struct shpstr *s1, struct shpstr *s2)
 192 {
 193     if (s1->shp_pstage == PLG_INFECT && s2->shp_pstage == PLG_HEALTHY)
 194         s2->shp_pstage = PLG_EXPOSED;
 195     if (s2->shp_pstage == PLG_INFECT && s1->shp_pstage == PLG_HEALTHY)
 196         s1->shp_pstage = PLG_EXPOSED;
 197 }
 198
 199 static int
 200 tend_land(struct shpstr *tenderp, char *units)
 201 {
 202     struct nstr_item lni;
 203     struct nstr_item targets;
 204     struct shpstr target;
 205     struct lndstr land;
 206     struct plnstr plane;
 207     struct nstr_item pni;
 208     char buf[1024];
 209
 210     if (!snxtitem(&lni, EF_LAND, units))
 211         return RET_SYN;
 212
 213     while (nxtitem(&lni, &land)) {
 214         if (!player->owner)
 215             continue;
 216         if (land.lnd_ship != tenderp->shp_uid) {
 217             pr("%s is not on %s!\n", prland(&land), prship(tenderp));
 218             continue;
 219         }
 220         if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
 221             pr("%s does not have \"assault\" capability and can't be tended\n",
 222                prland(&land));
 223             continue;
 224         }
 225         if (!snxtitem(&targets, EF_SHIP,
 226                       getstarg(player->argp[4], "Ship to be tended? ",
 227                                buf)))
 228             break;
 229         if (!check_land_ok(&land))
 230             return RET_SYN;
 231         while (nxtitem(&targets, &target)) {
 232             if (!player->owner &&
 233                 (getrel(getnatp(target.shp_own), player->cnum) < FRIENDLY))
 234                 continue;
 235             if (target.shp_uid == tenderp->shp_uid)
 236                 continue;
 237             if (tenderp->shp_x != target.shp_x ||
 238                 tenderp->shp_y != target.shp_y)
 239                 continue;
 240
 241             /* Fit unit on ship */
 242             count_units(&target);
 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 (target.shp_nland > 1) {
 258                     pr("%s doesn't have room for more than two spy units!\n",
 259                        prship(&target));
 260                     continue;
 261                 }
 262             } else if (target.shp_nland >= mchr[(int)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             land.lnd_mission = 0;
 279             target.shp_nland++;
 280             putland(land.lnd_uid, &land);
 281             expose_ship(tenderp, &target);
 282             putship(target.shp_uid, &target);
 283             count_units(tenderp);
 284             putship(tenderp->shp_uid, tenderp);
 285             snxtitem_xy(&pni, EF_PLANE, land.lnd_x, land.lnd_y);
 286             while (nxtitem(&pni, &plane)) {
 287                 if (plane.pln_flags & PLN_LAUNCHED)
 288                     continue;
 289                 if (plane.pln_land != land.lnd_uid)
 290                     continue;
 291                 sprintf(buf, "loaded on %s", prship(&target));
 292                 gift(target.shp_own, player->cnum, &plane, buf);
 293                 plane.pln_mission = 0;
 294                 putplane(plane.pln_uid, &plane);
 295             }
 296         }
 297     }
 298     return 0;
 299 }