2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2005, 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:
55 /* Format a ship name */
57 check_nav(struct sctstr *sect)
59 switch (dchr[sect->sct_type].d_flg & 03) {
64 if (sect->sct_effic < 2)
65 return CN_CONSTRUCTION;
68 if (sect->sct_effic < 60)
69 return CN_CONSTRUCTION;
77 /* load a specific ship given its
78 * location and what field to modify.
83 load_it(struct shpstr *sp, struct sctstr *psect, int i)
85 int shipown, amount, ship_amt, sect_amt;
86 int abs_max, max_amt, transfer;
88 struct mchrstr *vship;
90 amount = sp->shp_lend[i];
91 shipown = sp->shp_own;
92 comm = sp->shp_tend[i];
93 if (CANT_HAPPEN(comm <= I_NONE || comm > I_MAX))
96 ship_amt = sp->shp_item[comm];
97 sect_amt = psect->sct_item[comm];
99 /* check for disloyal civilians */
100 if (psect->sct_oldown != shipown && comm == I_CIVIL) {
102 "Ship #%d - unable to load disloyal civilians at %s.",
103 sp->shp_uid, xyas(psect->sct_x, psect->sct_y, psect->sct_own));
106 if (comm == I_CIVIL || comm == I_MILIT)
107 sect_amt--; /* leave 1 civ or mil to hold the sector. */
108 vship = &mchr[(int)sp->shp_type];
109 abs_max = max_amt = vship->m_item[comm];
112 return 0; /* can't load the ship, skip to the end. */
114 max_amt = min(sect_amt, max_amt - ship_amt);
115 if (max_amt <= 0 && (ship_amt != abs_max)) {
116 sp->shp_autonav |= AN_LOADING;
121 transfer = amount - ship_amt;
122 if (transfer > sect_amt) { /* not enough in the */
123 transfer = sect_amt; /* sector to fill the */
124 sp->shp_autonav |= AN_LOADING; /* ship, set load flag */
126 if (ship_amt + transfer > abs_max) /* Do not load more */
127 transfer = abs_max - ship_amt; /* then the max alowed */
131 return 0; /* nothing to move */
134 sp->shp_item[comm] = ship_amt + transfer;
135 if (comm == I_CIVIL || comm == I_MILIT)
136 sect_amt++; /*adjustment */
137 psect->sct_item[comm] = sect_amt - transfer;
139 /* deal with the plague */
140 if (psect->sct_pstage == PLG_INFECT && sp->shp_pstage == PLG_HEALTHY)
141 sp->shp_pstage = PLG_EXPOSED;
142 if (sp->shp_pstage == PLG_INFECT && psect->sct_pstage == PLG_HEALTHY)
143 psect->sct_pstage = PLG_EXPOSED;
145 return 1; /* we did someloading return 1 to keep */
146 /* our loop happy in nav_ship() */
151 * A guess alot of this looks like load_it but because of its location
152 * in the autonav code I had to split the 2 procedures up.
153 * unload_it dumps all the goods from the ship to the harbor.
154 * ONLY goods in the trade fields will be unloaded.
159 unload_it(struct shpstr *sp)
161 struct sctstr *sectp;
170 sectp = getsectp(sp->shp_x, sp->shp_y);
172 landowner = sectp->sct_own;
173 shipown = sp->shp_own;
175 for (i = 0; i < TMAX; ++i) {
176 if (sp->shp_tend[i] == I_NONE || sp->shp_lend[i] == 0)
180 if (sectp->sct_type != SCT_HARBR)
183 comm = sp->shp_tend[i];
184 if (CANT_HAPPEN(comm <= I_NONE || comm > I_MAX))
186 ship_amt = sp->shp_item[comm];
187 sect_amt = sectp->sct_item[comm];
189 /* check for disloyal civilians */
190 if (sectp->sct_oldown != shipown && comm == I_CIVIL) {
192 "Ship #%d - unable to unload civilians into a disloyal sector at %s.",
193 sp->shp_uid, xyas(sectp->sct_x, sectp->sct_y,
198 ship_amt--; /* This leaves 1 civs on board the ship */
200 max_amt = min(ship_amt, ITEM_MAX - sect_amt);
204 sp->shp_item[comm] = ship_amt - max_amt;
205 sectp->sct_item[comm] = sect_amt + max_amt;
207 if (sectp->sct_pstage == PLG_INFECT && sp->shp_pstage == PLG_HEALTHY)
208 sp->shp_pstage = PLG_EXPOSED;
209 if (sp->shp_pstage == PLG_INFECT && sectp->sct_pstage == PLG_HEALTHY)
210 sectp->sct_pstage = PLG_EXPOSED;
215 * Assume a check for fuel=0 has already been made and passed.
216 * Try to fill a ship using petro. and then oil.
218 * This should be merged with the fuel command someday.
223 auto_fuel_ship(struct shpstr *sp)
234 getship(sp->shp_uid, sp); /* refresh */
235 /* fill with petro */
236 maxfuel = mchr[(int)sp->shp_type].m_fuelc;
237 d = (double)maxfuel / 5.0;
238 if ((d - (int)d > 0.0))
242 newfuel = supply_commod(sp->shp_own, sp->shp_x,
243 sp->shp_y, I_PETROL, need);
244 add_fuel += newfuel * 5;
245 if (add_fuel > maxfuel)
247 sp->shp_fuel += add_fuel;
248 totalfuel += add_fuel;
250 if (totalfuel == maxfuel) {
251 putship(sp->shp_uid, sp);
252 return; /* the ship is full */
256 d = (double)(maxfuel - totalfuel) / 50.0;
257 if ((d - (int)d > 0.0))
261 newfuel = supply_commod(sp->shp_own, sp->shp_x,
262 sp->shp_y, I_OIL, need);
263 add_fuel = newfuel * 50;
264 if (add_fuel > maxfuel)
266 sp->shp_fuel += add_fuel;
267 putship(sp->shp_uid, sp);