home *** CD-ROM | disk | FTP | other *** search
- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)misc.c 5.5 (Berkeley) 6/1/90";
- #endif /* not lint */
-
- #include "externs.h"
- #include "pathnames.h"
-
- #define distance(x,y) (abs(x) >= abs(y) ? abs(x) + abs(y)/2 : abs(y) + abs(x)/2)
-
- /* XXX */
- range(from, to)
- struct ship *from, *to;
- {
- register bow1r, bow1c, bow2r, bow2c;
- int stern1r, stern1c, stern2c, stern2r;
- register int bb, bs, sb, ss, result;
-
- if (!to->file->dir)
- return -1;
- stern1r = bow1r = from->file->row;
- stern1c = bow1c = from->file->col;
- stern2r = bow2r = to->file->row;
- stern2c = bow2c = to->file->col;
- result = bb = distance(bow2r - bow1r, bow2c - bow1c);
- if (bb < 5) {
- stern2r += dr[to->file->dir];
- stern2c += dc[to->file->dir];
- stern1r += dr[from->file->dir];
- stern1c += dc[from->file->dir];
- bs = distance((bow2r - stern1r), (bow2c - stern1c));
- sb = distance((bow1r - stern2r), (bow1c - stern2c));
- ss = distance((stern2r - stern1r) ,(stern2c - stern1c));
- result = min(bb, min(bs, min(sb, ss)));
- }
- return result;
- }
-
- struct ship *
- closestenemy(from, side, anyship)
- register struct ship *from;
- char side, anyship;
- {
- register struct ship *sp;
- register char a;
- int olddist = 30000, dist;
- struct ship *closest = 0;
-
- a = capship(from)->nationality;
- foreachship(sp) {
- if (sp == from)
- continue;
- if (sp->file->dir == 0)
- continue;
- if (a == capship(sp)->nationality && !anyship)
- continue;
- if (side && gunsbear(from, sp) != side)
- continue;
- dist = range(from, sp);
- if (dist < olddist) {
- closest = sp;
- olddist = dist;
- }
- }
- return closest;
- }
-
- angle(dr, dc)
- register dr, dc;
- {
- register i;
-
- if (dc >= 0 && dr > 0)
- i = 0;
- else if (dr <= 0 && dc > 0)
- i = 2;
- else if (dc <= 0 && dr < 0)
- i = 4;
- else
- i = 6;
- dr = abs(dr);
- dc = abs(dc);
- if ((i == 0 || i == 4) && dc * 2.4 > dr) {
- i++;
- if (dc > dr * 2.4)
- i++;
- } else if ((i == 2 || i == 6) && dr * 2.4 > dc) {
- i++;
- if (dr > dc * 2.4)
- i++;
- }
- return i % 8 + 1;
- }
-
- gunsbear(from, to) /* checks for target bow or stern */
- register struct ship *from, *to;
- {
- int Dr, Dc, i;
- register ang;
-
- Dr = from->file->row - to->file->row;
- Dc = to->file->col - from->file->col;
- for (i = 2; i; i--) {
- if ((ang = angle(Dr, Dc) - from->file->dir + 1) < 1)
- ang += 8;
- if (ang >= 2 && ang <= 4)
- return 'r';
- if (ang >= 6 && ang <= 7)
- return 'l';
- Dr += dr[to->file->dir];
- Dc += dc[to->file->dir];
- }
- return 0;
- }
-
- portside(from, on, quick)
- register struct ship *from, *on;
- int quick; /* returns true if fromship is */
- { /* shooting at onship's starboard side */
- register ang;
- register Dr, Dc;
-
- Dr = from->file->row - on->file->row;
- Dc = on->file->col - from->file->col;
- if (quick == -1) {
- Dr += dr[on->file->dir];
- Dc += dc[on->file->dir];
- }
- ang = angle(Dr, Dc);
- if (quick != 0)
- return ang;
- ang = (ang + 4 - on->file->dir - 1) % 8 + 1;
- return ang < 5;
- }
-
- colours(sp)
- register struct ship *sp;
- {
- register char flag;
-
- if (sp->file->struck)
- flag = '!';
- if (sp->file->explode)
- flag = '#';
- if (sp->file->sink)
- flag = '~';
- if (sp->file->struck)
- return flag;
- flag = *countryname[capship(sp)->nationality];
- return sp->file->FS ? flag : tolower(flag);
- }
-
- #include <sys/file.h>
- log(s)
- register struct ship *s;
- {
- FILE *fp;
- int persons;
- int n;
- struct logs log[NLOG];
- float net;
- register struct logs *lp;
-
- if ((fp = fopen(_PATH_LOGFILE, "r+")) == NULL)
- return;
- #ifdef LOCK_EX
- if (flock(fileno(fp), LOCK_EX) < 0)
- return;
- #endif
- net = (float)s->file->points / s->specs->pts;
- persons = getw(fp);
- n = fread((char *)log, sizeof(struct logs), NLOG, fp);
- for (lp = &log[n]; lp < &log[NLOG]; lp++)
- lp->l_name[0] = lp->l_uid = lp->l_shipnum
- = lp->l_gamenum = lp->l_netpoints = 0;
- rewind(fp);
- if (persons < 0)
- (void) putw(1, fp);
- else
- (void) putw(persons + 1, fp);
- for (lp = log; lp < &log[NLOG]; lp++)
- if (net > (float)lp->l_netpoints
- / scene[lp->l_gamenum].ship[lp->l_shipnum].specs->pts) {
- (void) fwrite((char *)log,
- sizeof (struct logs), lp - log, fp);
- (void) strcpy(log[NLOG-1].l_name, s->file->captain);
- log[NLOG-1].l_uid = getuid();
- log[NLOG-1].l_shipnum = s->file->index;
- log[NLOG-1].l_gamenum = game;
- log[NLOG-1].l_netpoints = s->file->points;
- (void) fwrite((char *)&log[NLOG-1],
- sizeof (struct logs), 1, fp);
- (void) fwrite((char *)lp,
- sizeof (struct logs), &log[NLOG-1] - lp, fp);
- break;
- }
- #ifdef LOCK_EX
- (void) flock(fileno(fp), LOCK_UN);
- #endif
- (void) fclose(fp);
- }
-