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) 1986-2010, 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  *     Markus Armbruster, 2004-2009
  35  */
  36
  37 #include <config.h>
  38
  39 #include "commands.h"
  40 #include "item.h"
  41 #include "land.h"
  42 #include "plague.h"
  43 #include "plane.h"
  44 #include "ship.h"
  45
  46 static void expose_ship(struct shpstr *s1, struct shpstr *s2);
  47 static int tend_land(struct shpstr *tenderp, char *units);
  48
  49 int
  50 tend(void)
  51 {
  52     struct nstr_item targets;
  53     struct nstr_item tenders;
  54     struct shpstr tender;
  55     struct shpstr target;
  56     struct ichrstr *ip;
  57     struct mchrstr *vbase;
  58     int amt;
  59     int retval;
  60     int ontender;
  61     int ontarget;
  62     int maxtender;
  63     int maxtarget;
  64     int transfer;
  65     int total;
  66     int type;
  67     char *p;
  68     char prompt[512];
  69     char buf[1024];
  70
  71     p = getstarg(player->argp[1], "Tend what commodity (or 'land')? ",
  72                  buf);
  73     if (!p || !*p)
  74         return RET_SYN;
  75
  76     if (!strncmp(p, "land", 4))
  77         type = EF_LAND;
  78     else if (NULL != (ip = item_by_name(p)))
  79         type = EF_SECTOR;
  80     else {
  81         pr("Can't tend '%s'\n", p);
  82         return RET_SYN;
  83     }
  84
  85     if (!snxtitem(&tenders, EF_SHIP, player->argp[2], "Tender(s)? "))
  86         return RET_SYN;
  87
  88     while (nxtitem(&tenders, &tender)) {
  89         if (!player->owner)
  90             continue;
  91         if (type == EF_LAND) {
  92             sprintf(prompt, "Land unit(s) to tend from %s? ",
  93                     prship(&tender));
  94             p = getstarg(player->argp[3], prompt, buf);
  95             if (!p)
  96                 return RET_FAIL;
  97             if (!*p)
  98                 continue;
  99             if (!check_ship_ok(&tender))
 100                 return RET_SYN;
 101             if (0 != (retval = tend_land(&tender, p)))
 102                 return retval;
 103             continue;
 104         }
 105         sprintf(prompt, "Number of %s to tend from %s? ",
 106                 ip->i_name, prship(&tender));
 107         p = getstarg(player->argp[3], prompt, buf);
 108         if (!p)
 109             return RET_FAIL;
 110         if (!*p)
 111             continue;
 112         if (!check_ship_ok(&tender))
 113             return RET_SYN;
 114         if (!(amt = atoi(p))) {
 115             pr("Amount must be non-zero!\n");
 116             return RET_SYN;
 117         }
 118         ontender = tender.shp_item[ip->i_uid];
 119         if (ontender == 0 && amt > 0) {
 120             pr("No %s on %s\n", ip->i_name, prship(&tender));
 121             return RET_FAIL;
 122         }
 123         vbase = &mchr[(int)tender.shp_type];
 124         maxtender = vbase->m_item[ip->i_uid];
 125         if (maxtender == 0) {
 126             pr("A %s cannot hold any %s\n",
 127                mchr[(int)tender.shp_type].m_name, ip->i_name);
 128             break;
 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                 (getrel(getnatp(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             ontarget = target.shp_item[ip->i_uid];
 146             if (ontarget == 0 && amt < 0) {
 147                 pr("No %s on %s\n", ip->i_name, prship(&target));
 148                 continue;
 149             }
 150             vbase = &mchr[(int)target.shp_type];
 151             maxtarget = vbase->m_item[ip->i_uid];
 152             if (amt < 0) {
 153                 if (!player->owner)
 154                     amt = 0;
 155
 156                 /* take from target and give to tender */
 157                 transfer = MIN(ontarget, -amt);
 158                 transfer = MIN(maxtender - ontender, transfer);
 159                 if (transfer == 0)
 160                     continue;
 161                 target.shp_item[ip->i_uid] = ontarget - transfer;
 162                 ontender += transfer;
 163                 total += transfer;
 164             } else {
 165                 /* give to target from tender */
 166                 transfer = MIN(ontender, amt);
 167                 transfer = MIN(transfer, maxtarget - ontarget);
 168                 if (transfer == 0)
 169                     continue;
 170                 target.shp_item[ip->i_uid] = ontarget + transfer;
 171                 ontender -= transfer;
 172                 total += transfer;
 173                 if (transfer && target.shp_own != player->cnum) {
 174                     wu(0, target.shp_own, "%s tended %d %s to %s\n",
 175                        cname(player->cnum), total, ip->i_name,
 176                        prship(&target));
 177                 }
 178             }
 179             expose_ship(&tender, &target);
 180             putship(target.shp_uid, &target);
 181             if (amt > 0 && ontender == 0) {
 182                 pr("%s out of %s\n", prship(&tender), ip->i_name);
 183                 break;
 184             }
 185         }
 186         pr("%d total %s transferred %s %s\n",
 187            total, ip->i_name, (amt > 0) ? "off of" : "to",
 188            prship(&tender));
 189         tender.shp_item[ip->i_uid] = ontender;
 190         tender.shp_mission = 0;
 191         putship(tender.shp_uid, &tender);
 192     }
 193     return RET_OK;
 194 }
 195
 196 static void
 197 expose_ship(struct shpstr *s1, struct shpstr *s2)
 198 {
 199     if (s1->shp_pstage == PLG_INFECT && s2->shp_pstage == PLG_HEALTHY)
 200         s2->shp_pstage = PLG_EXPOSED;
 201     if (s2->shp_pstage == PLG_INFECT && s1->shp_pstage == PLG_HEALTHY)
 202         s1->shp_pstage = PLG_EXPOSED;
 203 }
 204
 205 static int
 206 tend_land(struct shpstr *tenderp, char *units)
 207 {
 208     struct nstr_item lni;
 209     struct nstr_item targets;
 210     struct shpstr target;
 211     struct lndstr land;
 212     char buf[1024];
 213
 214     if (!snxtitem(&lni, EF_LAND, units, NULL))
 215         return RET_SYN;
 216
 217     while (nxtitem(&lni, &land)) {
 218         if (!player->owner)
 219             continue;
 220         if (land.lnd_ship != tenderp->shp_uid) {
 221             pr("%s is not on %s!\n", prland(&land), prship(tenderp));
 222             continue;
 223         }
 224         if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
 225             pr("%s does not have \"assault\" capability and can't be tended\n",
 226                prland(&land));
 227             continue;
 228         }
 229         if (!snxtitem(&targets, EF_SHIP,
 230                       player->argp[4], "Ship to be tended? "))
 231             return RET_FAIL;
 232         if (!check_ship_ok(tenderp) || !check_land_ok(&land))
 233             return RET_SYN;
 234         while (nxtitem(&targets, &target)) {
 235             if (!player->owner &&
 236                 (getrel(getnatp(target.shp_own), player->cnum) < FRIENDLY))
 237                 continue;
 238             if (target.shp_uid == tenderp->shp_uid)
 239                 continue;
 240             if (tenderp->shp_x != target.shp_x ||
 241                 tenderp->shp_y != target.shp_y)
 242                 continue;
 243
 244             /* Fit unit on ship */
 245             getship(target.shp_uid, &target);
 246
 247             if ((!(lchr[(int)land.lnd_type].l_flags & L_LIGHT)) &&
 248                 (!((mchr[(int)target.shp_type].m_flags & M_SUPPLY) &&
 249                    (!(mchr[(int)target.shp_type].m_flags & M_SUB))))) {
 250                 pr("You can only load light units onto ships,\n"
 251                    "unless the ship is a non-sub supply ship\n"
 252                    "%s not tended\n", prland(&land));
 253                 continue;
 254             }
 255
 256             if ((mchr[(int)target.shp_type].m_flags & M_SUB) &&
 257                 (lchr[(int)land.lnd_type].l_flags & L_SPY) &&
 258                 !mchr[(int)target.shp_type].m_nland) {
 259                 if (shp_nland(&target) > 1) {
 260                     pr("%s doesn't have room for more than two spy units!\n",
 261                        prship(&target));
 262                     continue;
 263                 }
 264             } else if (shp_nland(&target) >= mchr[target.shp_type].m_nland) {
 265                 if (mchr[(int)target.shp_type].m_nland)
 266                     pr("%s doesn't have room for any more land units!\n",
 267                        prship(&target));
 268                 else
 269                     pr("%s doesn't carry land units!\n", prship(&target));
 270                 continue;
 271             }
 272             pr("%s transferred from %s to %s\n",
 273                prland(&land), prship(tenderp), prship(&target));
 274             sprintf(buf, "loaded on your %s at %s",
 275                     prship(&target), xyas(target.shp_x, target.shp_y,
 276                                           target.shp_own));
 277             gift(target.shp_own, player->cnum, &land, buf);
 278             land.lnd_ship = target.shp_uid;
 279             land.lnd_harden = 0;
 280             putland(land.lnd_uid, &land);
 281             expose_ship(tenderp, &target);
 282             putship(target.shp_uid, &target);
 283             putship(tenderp->shp_uid, tenderp);
 284         }
 285     }
 286     return 0;
 287 }