2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2004, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
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.
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.
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
22 * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
23 * related information and legal notices. It is expected that any future
24 * projects/authors will amend these files as needed.
28 * nav_util.c: Utilities for autonav and sail
30 * Known contributors to this file:
57 /* Format a ship name */
59 check_nav(struct sctstr *sect)
61 switch (dchr[sect->sct_type].d_flg & 03) {
66 if (sect->sct_effic < 2)
67 return CN_CONSTRUCTION;
70 if (sect->sct_effic < 60)
71 return CN_CONSTRUCTION;
79 /* load a specific ship given its
80 * location and what field to modify.
85 load_it(register struct shpstr *sp, register struct sctstr *psect, int i)
87 int comm, shipown, amount, ship_amt, sect_amt;
88 int abs_max, max_amt, transfer;
89 struct mchrstr *vship;
91 amount = sp->shp_lend[i];
92 shipown = sp->shp_own;
93 comm = sp->shp_tend[i];
94 if (CANT_HAPPEN((unsigned)comm > I_MAX))
97 ship_amt = sp->shp_item[comm];
98 sect_amt = psect->sct_item[comm];
100 /* check for disloyal civilians */
101 if (psect->sct_oldown != shipown && comm == I_CIVIL) {
103 "Ship #%d - unable to load disloyal civilians at %s.",
104 sp->shp_uid, xyas(psect->sct_x, psect->sct_y, psect->sct_own));
107 if (comm == I_CIVIL || comm == I_MILIT)
108 sect_amt--; /* leave 1 civ or mil to hold the sector. */
109 vship = &mchr[(int)sp->shp_type];
110 abs_max = max_amt = vship->m_item[comm];
113 return 0; /* can't load the ship, skip to the end. */
115 max_amt = min(sect_amt, max_amt - ship_amt);
116 if (max_amt <= 0 && (ship_amt != abs_max)) {
117 sp->shp_autonav |= AN_LOADING;
122 transfer = amount - ship_amt;
123 if (transfer > sect_amt) { /* not enough in the */
124 transfer = sect_amt; /* sector to fill the */
125 sp->shp_autonav |= AN_LOADING; /* ship, set load flag */
127 if (ship_amt + transfer > abs_max) /* Do not load more */
128 transfer = abs_max - ship_amt; /* then the max alowed */
132 return 0; /* nothing to move */
135 sp->shp_item[comm] = ship_amt + transfer;
136 if (comm == I_CIVIL || comm == I_MILIT)
137 sect_amt++; /*adjustment */
138 psect->sct_item[comm] = sect_amt - transfer;
140 /* deal with the plague */
141 if (psect->sct_pstage == PLG_INFECT && sp->shp_pstage == PLG_HEALTHY)
142 sp->shp_pstage = PLG_EXPOSED;
143 if (sp->shp_pstage == PLG_INFECT && psect->sct_pstage == PLG_HEALTHY)
144 psect->sct_pstage = PLG_EXPOSED;
146 return 1; /* we did someloading return 1 to keep */
147 /* our loop happy in nav_ship() */
152 * A guess alot of this looks like load_it but because of its location
153 * in the autonav code I had to split the 2 procedures up.
154 * unload_it dumps all the goods from the ship to the harbor.
155 * ONLY goods in the trade fields will be unloaded.
160 unload_it(register struct shpstr *sp)
162 struct sctstr *sectp;
171 sectp = getsectp(sp->shp_x, sp->shp_y);
173 landowner = sectp->sct_own;
174 shipown = sp->shp_own;
176 for (i = 0; i < TMAX; ++i) {
177 if (sp->shp_tend[i] == I_NONE || sp->shp_lend[i] == 0)
181 if (sectp->sct_type != SCT_HARBR)
184 comm = sp->shp_tend[i];
185 if (CANT_HAPPEN((unsigned)comm > I_MAX))
187 ship_amt = sp->shp_item[comm];
188 sect_amt = sectp->sct_item[comm];
190 /* check for disloyal civilians */
191 if (sectp->sct_oldown != shipown && comm == I_CIVIL) {
193 "Ship #%d - unable to unload civilians into a disloyal sector at %s.",
194 sp->shp_uid, xyas(sectp->sct_x, sectp->sct_y,
199 ship_amt--; /* This leaves 1 civs on board the ship */
201 max_amt = min(ship_amt, ITEM_MAX - sect_amt);
205 sp->shp_item[comm] = ship_amt - max_amt;
206 sectp->sct_item[comm] = sect_amt + max_amt;
208 if (sectp->sct_pstage == PLG_INFECT && sp->shp_pstage == PLG_HEALTHY)
209 sp->shp_pstage = PLG_EXPOSED;
210 if (sp->shp_pstage == PLG_INFECT && sectp->sct_pstage == PLG_HEALTHY)
211 sectp->sct_pstage = PLG_EXPOSED;
216 * Assume a check for fuel=0 has already been made and passed.
217 * Try to fill a ship using petro. and then oil.
219 * This should be merged with the fuel command someday.
224 auto_fuel_ship(register struct shpstr *sp)
235 getship(sp->shp_uid, sp); /* refresh */
236 /* fill with petro */
237 maxfuel = mchr[(int)sp->shp_type].m_fuelc;
238 d = (double)maxfuel / 5.0;
239 if ((d - (int)d > 0.0))
243 newfuel = supply_commod(sp->shp_own, sp->shp_x,
244 sp->shp_y, I_PETROL, need);
245 add_fuel += newfuel * 5;
246 if (add_fuel > maxfuel)
248 sp->shp_fuel += add_fuel;
249 totalfuel += add_fuel;
251 if (totalfuel == maxfuel) {
252 putship(sp->shp_uid, sp);
253 return; /* the ship is full */
257 d = (double)(maxfuel - totalfuel) / 50.0;
258 if ((d - (int)d > 0.0))
262 newfuel = supply_commod(sp->shp_own, sp->shp_x,
263 sp->shp_y, I_OIL, need);
264 add_fuel = newfuel * 50;
265 if (add_fuel > maxfuel)
267 sp->shp_fuel += add_fuel;
268 putship(sp->shp_uid, sp);