Import of Empire 4.2.12
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src/lib/commands/lten.c
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175
src/lib/commands/lten.c
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/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
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* related information and legal notices. It is expected that any future
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* projects/authors will amend these files as needed.
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*
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* ---
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*
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* lten.c: Transfer commodity from a ship to a land unit the ship is
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* carrying
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*
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* Known contributors to this file:
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* Dave Pare, 1986
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* Thomas Ruschak
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* Ken Stevens, 1995
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* Steve McClure, 1998
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*/
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#include "misc.h"
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#include "player.h"
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#include "var.h"
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#include "xy.h"
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#include "file.h"
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#include "ship.h"
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#include "item.h"
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#include "nsc.h"
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#include "nat.h"
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#include "plane.h"
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#include "nuke.h"
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#include "land.h"
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#include "genitem.h"
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#include "commands.h"
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static void expose_land(struct shpstr *s1, struct lndstr *l1);
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int
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ltend(void)
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{
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struct nstr_item targets;
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struct nstr_item tenders;
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struct shpstr tender;
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struct lndstr target;
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struct ichrstr *ip;
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struct mchrstr *vbase;
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struct lchrstr *lbase;
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int amt;
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int ontender;
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int ontarget;
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int maxtender;
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int maxtarget;
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int transfer;
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int total;
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s_char *p;
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s_char buf[1024];
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if (!(ip = whatitem(player->argp[1], "Transfer what commodity? ")))
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return RET_SYN;
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if (!snxtitem(&tenders, EF_SHIP, getstarg(player->argp[2], "Tender(s)? ", buf)))
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return RET_SYN;
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while (nxtitem(&tenders, (s_char *)&tender)) {
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if (!player->owner)
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continue;
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if ((p = getstarg(player->argp[3], "Amount to transfer? ", buf)) == 0)
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break;
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if (!check_ship_ok(&tender))
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return RET_FAIL;
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if ((amt = atoi(p)) == 0)
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break;
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ontender = getvar(ip->i_vtype, (s_char *)&tender, EF_SHIP);
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if (ontender == 0 && amt > 0) {
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pr("No %s on %s\n", ip->i_name, prship(&tender));
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return RET_FAIL;
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}
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vbase = &mchr[(int)tender.shp_type];
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maxtender = vl_find(ip->i_vtype, vbase->m_vtype,
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vbase->m_vamt, (int)vbase->m_nv);
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if (maxtender == 0) {
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pr("A %s cannot hold any %s\n",
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mchr[(int)tender.shp_type].m_name,
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ip->i_name);
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break;
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}
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if (!snxtitem(&targets, EF_LAND,
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getstarg(player->argp[4], "Units to be tended? ", buf)))
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break;
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if (!check_ship_ok(&tender))
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return RET_FAIL;
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total = 0;
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while (tend_nxtitem(&targets, (s_char *)&target)) {
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if (!player->owner)
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continue;
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if (target.lnd_ship != tender.shp_uid)
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continue;
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ontarget = getvar(ip->i_vtype,(s_char *)&target, EF_LAND);
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if (ontarget == 0 && amt < 0) {
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pr("No %s on %s\n",
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ip->i_name, prship((struct shpstr *)&target));
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continue;
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}
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lbase = &lchr[(int)target.lnd_type];
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maxtarget = vl_find(ip->i_vtype, lbase->l_vtype,
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lbase->l_vamt, (int)lbase->l_nv);
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if (amt < 0) {
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if (!player->owner)
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amt=0;
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/* take from target and give to tender */
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transfer = min(ontarget, -amt);
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transfer = min(maxtender - ontender, transfer);
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if (transfer == 0)
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continue;
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putvar(ip->i_vtype, ontarget - transfer,
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(s_char *)&target, EF_LAND);
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ontender += transfer;
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total += transfer;
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} else {
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/* give to target from tender */
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transfer = min(ontender, amt);
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transfer = min(transfer, maxtarget - ontarget);
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if (transfer == 0)
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continue;
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putvar(ip->i_vtype, ontarget + transfer,
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(s_char *)&target, EF_LAND);
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ontender -= transfer;
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total += transfer;
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}
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expose_land(&tender, &target);
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putland(target.lnd_uid, &target);
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if (amt > 0 && ontender == 0) {
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pr("%s out of %s\n", prship(&tender),
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ip->i_name);
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break;
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}
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}
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pr("%d total %s transferred %s %s\n",
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total, ip->i_name, (amt > 0) ? "off of" : "to",
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prship(&tender));
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putvar(ip->i_vtype, ontender, (s_char *)&tender, EF_SHIP);
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tender.shp_mission = 0;
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putship(tender.shp_uid, &tender);
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}
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return RET_OK;
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}
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static void
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expose_land(struct shpstr *s1, struct lndstr *l1)
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{
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if (getvar(V_PSTAGE, (s_char *)s1, EF_SHIP) == PLG_INFECT &&
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getvar(V_PSTAGE, (s_char *)l1, EF_LAND) == PLG_HEALTHY)
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putvar(V_PSTAGE, PLG_EXPOSED, (s_char *)l1, EF_LAND);
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if (getvar(V_PSTAGE, (s_char *)l1, EF_LAND) == PLG_INFECT &&
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getvar(V_PSTAGE, (s_char *)s1, EF_SHIP) == PLG_HEALTHY)
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putvar(V_PSTAGE, PLG_EXPOSED, (s_char *)s1, EF_SHIP);
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}
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