Markus Armbruster
7e2008e7f4
Why upgrade? I'm not a lawyer, but here's my take on the differences to version 2: * Software patents: better protection against abuse of patents to prevent users from exercising the rights under the GPL. I doubt we'll get hit with a patent suit, but it's a good move just on general principles. * License compatibility: compatible with more free licenses, i.e. can "steal" more free software for use in Empire. I don't expect to steal much, but it's nice to have the option. * Definition of "source code": modernization of some details for today's networked world, to make it easier to distribute the software. Not really relevant to us now, as we normally distribute full source code. * Tivoization: this is about putting GPL-licensed software in hardware, then make the hardware refuse to run modified software. "Neat" trick to effectively deny its users their rights under the GPL. Abuse was "pioneered" by TiVo (popular digital video recorders). GPLv3 forbids it. Unlikely to become a problem for us. * Internationalization: more careful wording, to harden the license outside the US. The lawyers tell us it better be done that way. * License violations: friendlier way to deal with license violations. This has come out of past experience enforcing the GPL. * Additional permissions: Probably not relevant to us. Also include myself in the list of principal authors.
341 lines
9 KiB
C
341 lines
9 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure, Markus Armbruster
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*
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* Empire 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 3 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, see <http://www.gnu.org/licenses/>.
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* torp.c: Fire torpedoes at enemy ships
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*
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* Known contributors to this file:
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* Dave Pare
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* Thomas Ruschak, 1992
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* Ken Stevens, 1995
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* Steve McClure, 2000
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* Markus Armbruster, 2004-2009
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*/
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#include <config.h>
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#include "commands.h"
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#include "news.h"
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#include "optlist.h"
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#include "retreat.h"
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#include "ship.h"
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static void anti_torp(int f, int ntorping, int vshipown);
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static void fire_dchrg(struct shpstr *, struct shpstr *, int);
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static int fire_torp(struct shpstr *, struct shpstr *, int);
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int
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torp(void)
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{
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natid vshipown;
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int range;
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int dam;
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int subno;
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int victno;
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int erange;
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double hitchance;
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struct shpstr vship;
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struct shpstr sub;
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char *ptr;
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struct nstr_item nbst;
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char buf[1024];
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int ntorping = 0;
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char prompt[128];
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if (!snxtitem(&nbst, EF_SHIP, player->argp[1], "From ship(s)? "))
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return RET_SYN;
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while (nxtitem(&nbst, &sub)) {
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if (sub.shp_own != player->cnum)
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continue;
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if ((mchr[(int)sub.shp_type].m_flags & M_TORP) == 0)
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continue;
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if (sub.shp_item[I_GUN] == 0
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|| sub.shp_item[I_SHELL] < SHP_TORP_SHELLS)
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continue;
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if (sub.shp_item[I_MILIT] < 1)
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continue;
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if (sub.shp_effic < 60)
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continue;
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if (sub.shp_mobil <= 0)
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continue;
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ntorping++;
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}
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pr("%d ships are eligible to torp\n", ntorping);
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snxtitem_rewind(&nbst);
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while (nxtitem(&nbst, &sub)) {
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if (!sub.shp_own)
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continue;
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if (sub.shp_own != player->cnum) {
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continue;
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}
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if ((mchr[(int)sub.shp_type].m_flags & M_TORP) == 0) {
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pr("Ship # %d: A %s can't fire torpedoes!\n",
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sub.shp_uid, mchr[(int)sub.shp_type].m_name);
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continue;
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}
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if (sub.shp_item[I_GUN] == 0
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|| sub.shp_item[I_SHELL] < SHP_TORP_SHELLS) {
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pr("Ship #%d has insufficient armament\n", sub.shp_uid);
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continue;
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}
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if (sub.shp_item[I_MILIT] < 1) {
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pr("Ship #%d has insufficient crew\n", sub.shp_uid);
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continue;
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}
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if (sub.shp_effic < 60) {
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pr("Ship #%d torpedo tubes inoperative.\n", sub.shp_uid);
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continue;
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}
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if (sub.shp_mobil <= 0) {
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pr("Ship #%d has insufficient mobility\n", sub.shp_uid);
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continue;
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}
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subno = sub.shp_uid;
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sprintf(prompt, "Ship %d, target? ", sub.shp_uid);
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if (!(ptr = getstarg(player->argp[2], prompt, buf)))
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return RET_SYN;
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if (!check_ship_ok(&sub))
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return RET_FAIL;
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if ((victno = atoi(ptr)) < 0)
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return RET_SYN;
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if (!getship(victno, &vship))
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return RET_FAIL;
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if (!vship.shp_own)
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return RET_FAIL;
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vshipown = vship.shp_own;
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if (victno == subno) {
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pr("Shooting yourself, eh? How strange...\n");
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continue;
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}
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if (mchr[(int)vship.shp_type].m_flags & M_SUB) {
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if (!(mchr[(int)sub.shp_type].m_flags & M_SUBT)) {
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pr("You can't torpedo a submarine!\n");
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continue;
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}
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}
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dam = shp_torp(&sub, 1);
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sub.shp_mission = 0;
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putship(sub.shp_uid, &sub);
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if (CANT_HAPPEN(dam < 0)) {
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pr("Ship #%d has insufficient armament\n", sub.shp_uid);
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continue;
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}
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if ((mchr[(int)sub.shp_type].m_flags & M_SUB) == 0)
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anti_torp(sub.shp_uid, ntorping, vshipown);
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getship(sub.shp_uid, &sub);
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if (sub.shp_own == 0)
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continue;
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erange = roundrange(torprange(&sub));
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pr("Effective torpedo range is %d.0\n", erange);
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pr("Whooosh... ");
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getship(victno, &vship);
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vshipown = vship.shp_own;
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range = mapdist(sub.shp_x, sub.shp_y, vship.shp_x, vship.shp_y);
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hitchance = shp_torp_hitchance(&sub, range);
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if (range <= erange) {
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pr("Hitchance = %d%%\n", (int)(hitchance * 100));
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}
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/* Now, can the torpedo even get there? */
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if (!line_of_sight(NULL, sub.shp_x, sub.shp_y,
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vship.shp_x, vship.shp_y)) {
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pr("BOOM!... Torpedo slams into land before reaching target.\n");
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/* We only tell the victim if we were within range. */
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if (range <= erange) {
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if (vshipown != 0)
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wu(0, vshipown, "Torpedo sighted @ %s by %s\n",
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xyas(sub.shp_x, sub.shp_y, vshipown),
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prship(&vship));
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}
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} else if (range > erange) {
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pr("Out of range\n");
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} else if (chance(hitchance)) {
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pr("BOOM!...\n");
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if (vshipown != 0)
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wu(0, vshipown, "%s in %s torpedoed %s for %d damage.\n",
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prsub(&sub), xyas(sub.shp_x, sub.shp_y, vshipown),
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prship(&vship), dam);
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if (vship.shp_rflags & RET_TORPED) {
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retreat_ship(&vship, 't');
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shipdamage(&vship, dam);
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} else
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shipdamage(&vship, dam);
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pr("Torpedo hit %s for %d damage.\n", prship(&vship), dam);
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if (vship.shp_effic < SHIP_MINEFF)
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pr("%s sunk!\n", prship(&vship));
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putship(vship.shp_uid, &vship);
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if (mchr[(int)sub.shp_type].m_flags & M_SUB)
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nreport(vshipown, N_TORP_SHIP, 0, 1);
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else
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nreport(vshipown, N_SHIP_TORP, player->cnum, 1);
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} else {
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pr("Missed\n");
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if (vshipown != 0)
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wu(0, vshipown, "Torpedo sighted @ %s by %s\n",
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xyas(sub.shp_x, sub.shp_y, vshipown), prship(&vship));
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}
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if (mchr[(int)sub.shp_type].m_flags & M_SUB)
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anti_torp(sub.shp_uid, ntorping, vshipown);
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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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anti_torp(int f, int ntorping, int vshipown)
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{
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struct shpstr sub;
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struct shpstr dd;
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int x;
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getship(f, &sub);
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if (sub.shp_own == vshipown)
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return;
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if ((mchr[(int)sub.shp_type].m_flags & M_SUB) == 0)
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pr("Starting our attack run...\n");
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x = 0;
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while (getship(x++, &dd) && sub.shp_effic >= SHIP_MINEFF) {
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if (dd.shp_own == 0)
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continue;
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if (dd.shp_own != vshipown)
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continue;
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if (!fire_torp(&dd, &sub, ntorping))
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fire_dchrg(&dd, &sub, ntorping);
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}
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}
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static void
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fire_dchrg(struct shpstr *sp, struct shpstr *targ, int ntargets)
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{
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int range, erange, dam;
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erange = roundrange(shp_fire_range(sp));
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range = mapdist(sp->shp_x, sp->shp_y, targ->shp_x, targ->shp_y);
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if (range > erange)
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return;
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if ((mchr[(int)targ->shp_type].m_flags & M_SUB) == 0) {
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/* Return fire to a torpedo boat */
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if (mchr[sp->shp_type].m_flags & M_SUB)
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return; /* sub deck gun can't return fire */
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dam = shp_fire(sp);
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putship(sp->shp_uid, sp);
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if (dam < 0)
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return;
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if (ntargets > 2)
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dam /= ntargets / 2;
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pr_beep();
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pr("Kaboom!!! Incoming shells!\n");
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if (sp->shp_own != 0)
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wu(0, sp->shp_own,
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"%s fired at %s\n", prship(sp), prship(targ));
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pr_beep();
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pr("BLAM! %d damage!\n", dam);
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} else {
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/* Return fire to a submarine */
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dam = shp_dchrg(sp);
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putship(sp->shp_uid, sp);
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if (dam < 0)
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return;
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if (ntargets > 2)
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dam /= ntargets / 2;
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pr("\nCAPTAIN! !!Depth charges!!...\n");
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if (sp->shp_own != 0)
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wu(0, sp->shp_own,
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"%s depth charged %s\n", prship(sp), prsub(targ));
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pr("click...WHAM! %d damage!\n", dam);
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}
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shipdamage(targ, dam);
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putship(targ->shp_uid, targ);
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}
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static int
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fire_torp(struct shpstr *sp, struct shpstr *targ, int ntargets)
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{
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int range, erange, dam;
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if ((mchr[targ->shp_type].m_flags & M_SUB)
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&& (mchr[sp->shp_type].m_flags & M_SUBT) == 0)
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return 0; /* need sub-torp to torpedo a sub */
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erange = roundrange(torprange(sp));
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range = mapdist(sp->shp_x, sp->shp_y, targ->shp_x, targ->shp_y);
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if (range > erange)
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return 0;
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if (!line_of_sight(NULL, sp->shp_x, sp->shp_y,
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targ->shp_x, targ->shp_y))
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return 0;
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dam = shp_torp(sp, 1);
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putship(sp->shp_uid, sp);
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if (dam < 0)
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return 0;
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pr("Captain! Torpedoes sighted!\n");
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if (chance(shp_torp_hitchance(sp, range))) {
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pr("BOOM!...\n");
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if (sp->shp_own != 0)
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wu(0, sp->shp_own, "%s @ %s torpedoed %s\n",
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prship(sp),
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xyas(sp->shp_x, sp->shp_y, sp->shp_own), prsub(targ));
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if (ntargets > 2)
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dam /= ntargets / 2;
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shipdamage(targ, dam);
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putship(targ->shp_uid, targ);
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if (mchr[(int)sp->shp_type].m_flags & M_SUB)
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nreport(targ->shp_own, N_TORP_SHIP, 0, 1);
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else
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nreport(targ->shp_own, N_SHIP_TORP, sp->shp_own, 1);
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} else {
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pr("Missed!\n");
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if (sp->shp_own != 0)
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wu(0, sp->shp_own,
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"%s missed %s with a torp at %s\n",
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prship(sp), prsub(targ),
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xyas(sp->shp_x, sp->shp_y, sp->shp_own));
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}
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return 1;
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}
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char *
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prsub(struct shpstr *sp)
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{
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if (mchr[(int)sp->shp_type].m_flags & M_SUB)
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return "sub";
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else
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return prship(sp);
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}
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