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) 1986-2008, 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             p = getstarg(player->argp[3], prompt, buf);
  94             if (!p)
  95                 return RET_SYN;
  96             if (!*p)
  97                 continue;
  98             if (!check_ship_ok(&tender))
  99                 return RET_SYN;
 100             if (0 != (retval = tend_land(&tender, p)))
 101                 return retval;
 102             continue;
 103         }
 104         sprintf(prompt, "Number of %s to tend from %s? ",
 105                 ip->i_name, prship(&tender));
 106         p = getstarg(player->argp[3], prompt, buf);
 107         if (!p)
 108             return RET_SYN;
 109         if (!*p)
 110             continue;
 111         if (!check_ship_ok(&tender))
 112             return RET_SYN;
 113         if (!(amt = atoi(p))) {
 114             pr("Amount must be non-zero!\n");
 115             return RET_SYN;
 116         }
 117         ontender = tender.shp_item[ip->i_uid];
 118         if (ontender == 0 && amt > 0) {
 119             pr("No %s on %s\n", ip->i_name, prship(&tender));
 120             return RET_FAIL;
 121         }
 122         vbase = &mchr[(int)tender.shp_type];
 123         maxtender = vbase->m_item[ip->i_uid];
 124         if (maxtender == 0) {
 125             pr("A %s cannot hold any %s\n",
 126                mchr[(int)tender.shp_type].m_name, ip->i_name);
 127             break;
 128         }
 129         if (!snxtitem(&targets, EF_SHIP,
 130                       getstarg(player->argp[4], "Ships to be tended? ",
 131                                buf)))
 132             return RET_SYN;
 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     struct plnstr plane;
 213     struct nstr_item pni;
 214     char buf[1024];
 215
 216     if (!snxtitem(&lni, EF_LAND, units))
 217         return RET_SYN;
 218
 219     while (nxtitem(&lni, &land)) {
 220         if (!player->owner)
 221             continue;
 222         if (land.lnd_ship != tenderp->shp_uid) {
 223             pr("%s is not on %s!\n", prland(&land), prship(tenderp));
 224             continue;
 225         }
 226         if (!(lchr[(int)land.lnd_type].l_flags & L_ASSAULT)) {
 227             pr("%s does not have \"assault\" capability and can't be tended\n",
 228                prland(&land));
 229             continue;
 230         }
 231         if (!snxtitem(&targets, EF_SHIP,
 232                       getstarg(player->argp[4], "Ship to be tended? ",
 233                                buf)))
 234             return RET_SYN;
 235         if (!check_land_ok(&land))
 236             return RET_SYN;
 237         while (nxtitem(&targets, &target)) {
 238             if (!player->owner &&
 239                 (getrel(getnatp(target.shp_own), player->cnum) < FRIENDLY))
 240                 continue;
 241             if (target.shp_uid == tenderp->shp_uid)
 242                 continue;
 243             if (tenderp->shp_x != target.shp_x ||
 244                 tenderp->shp_y != target.shp_y)
 245                 continue;
 246
 247             /* Fit unit on ship */
 248             count_units(&target);
 249             getship(target.shp_uid, &target);
 250
 251             if ((!(lchr[(int)land.lnd_type].l_flags & L_LIGHT)) &&
 252                 (!((mchr[(int)target.shp_type].m_flags & M_SUPPLY) &&
 253                    (!(mchr[(int)target.shp_type].m_flags & M_SUB))))) {
 254                 pr("You can only load light units onto ships,\n"
 255                    "unless the ship is a non-sub supply ship\n"
 256                    "%s not tended\n", prland(&land));
 257                 continue;
 258             }
 259
 260             if ((mchr[(int)target.shp_type].m_flags & M_SUB) &&
 261                 (lchr[(int)land.lnd_type].l_flags & L_SPY) &&
 262                 !mchr[(int)target.shp_type].m_nland) {
 263                 if (target.shp_nland > 1) {
 264                     pr("%s doesn't have room for more than two spy units!\n",
 265                        prship(&target));
 266                     continue;
 267                 }
 268             } else if (target.shp_nland >= mchr[(int)target.shp_type].m_nland) {
 269                 if (mchr[(int)target.shp_type].m_nland)
 270                     pr("%s doesn't have room for any more land units!\n",
 271                        prship(&target));
 272                 else
 273                     pr("%s doesn't carry land units!\n", prship(&target));
 274                 continue;
 275             }
 276             pr("%s transferred from %s to %s\n",
 277                prland(&land), prship(tenderp), prship(&target));
 278             sprintf(buf, "loaded on your %s at %s",
 279                     prship(&target), xyas(target.shp_x, target.shp_y,
 280                                           target.shp_own));
 281             gift(target.shp_own, player->cnum, &land, buf);
 282             land.lnd_ship = target.shp_uid;
 283             land.lnd_harden = 0;
 284             land.lnd_mission = 0;
 285             target.shp_nland++;
 286             putland(land.lnd_uid, &land);
 287             expose_ship(tenderp, &target);
 288             putship(target.shp_uid, &target);
 289             count_units(tenderp);
 290             putship(tenderp->shp_uid, tenderp);
 291             snxtitem_xy(&pni, EF_PLANE, land.lnd_x, land.lnd_y);
 292             while (nxtitem(&pni, &plane)) {
 293                 if (plane.pln_flags & PLN_LAUNCHED)
 294                     continue;
 295                 if (plane.pln_land != land.lnd_uid)
 296                     continue;
 297                 sprintf(buf, "loaded on %s", prship(&target));
 298                 gift(target.shp_own, player->cnum, &plane, buf);
 299                 plane.pln_mission = 0;
 300                 putplane(plane.pln_uid, &plane);
 301             }
 302         }
 303     }
 304     return 0;
 305 }