sail/misc.c

   1 /*      $NetBSD: misc.c,v 1.13 2003/08/07 09:37:43 agc Exp $    */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)misc.c      8.2 (Berkeley) 4/28/95";
  36 #else
  37 __RCSID("$NetBSD: misc.c,v 1.13 2003/08/07 09:37:43 agc Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <ctype.h>
  42 #include <stdio.h>
  43 #include <unistd.h>
  44 #include <string.h>
  45 #include "extern.h"
  46 #include "pathnames.h"
  47
  48 #define distance(x,y) (abs(x) >= abs(y) ? abs(x) + abs(y)/2 : abs(y) + abs(x)/2)
  49
  50 static int      angle(int, int);
  51
  52 /* XXX */
  53 int
  54 range(struct ship *from, struct ship *to)
  55 {
  56         int bow1r, bow1c, bow2r, bow2c;
  57         int stern1r, stern1c, stern2c, stern2r;
  58         int bb, bs, sb, ss, result;
  59
  60         if (!to->file->dir)
  61                 return -1;
  62         stern1r = bow1r = from->file->row;
  63         stern1c = bow1c = from->file->col;
  64         stern2r = bow2r = to->file->row;
  65         stern2c = bow2c = to->file->col;
  66         result = bb = distance(bow2r - bow1r, bow2c - bow1c);
  67         if (bb < 5) {
  68                 stern2r += dr[to->file->dir];
  69                 stern2c += dc[to->file->dir];
  70                 stern1r += dr[from->file->dir];
  71                 stern1c += dc[from->file->dir];
  72                 bs = distance((bow2r - stern1r), (bow2c - stern1c));
  73                 sb = distance((bow1r - stern2r), (bow1c - stern2c));
  74                 ss = distance((stern2r - stern1r) ,(stern2c - stern1c));
  75                 result = min(bb, min(bs, min(sb, ss)));
  76         }
  77         return result;
  78 }
  79
  80 struct ship *
  81 closestenemy(struct ship *from, int side, int anyship)
  82 {
  83         struct ship *sp;
  84         char a;
  85         int olddist = 30000, dist;
  86         struct ship *closest = 0;
  87
  88         a = capship(from)->nationality;
  89         foreachship(sp) {
  90                 if (sp == from)
  91                         continue;
  92                 if (sp->file->dir == 0)
  93                         continue;
  94                 if (a == capship(sp)->nationality && !anyship)
  95                         continue;
  96                 if (side && gunsbear(from, sp) != side)
  97                         continue;
  98                 dist = range(from, sp);
  99                 if (dist < olddist) {
 100                         closest = sp;
 101                         olddist = dist;
 102                 }
 103         }
 104         return closest;
 105 }
 106
 107 static int
 108 angle(int dr, int dc)
 109 {
 110         int i;
 111
 112         if (dc >= 0 && dr > 0)
 113                 i = 0;
 114         else if (dr <= 0 && dc > 0)
 115                 i = 2;
 116         else if (dc <= 0 && dr < 0)
 117                 i = 4;
 118         else
 119                 i = 6;
 120         dr = abs(dr);
 121         dc = abs(dc);
 122         if ((i == 0 || i == 4) && dc * 2.4 > dr) {
 123                 i++;
 124                 if (dc > dr * 2.4)
 125                         i++;
 126         } else if ((i == 2 || i == 6) && dr * 2.4 > dc) {
 127                 i++;
 128                 if (dr > dc * 2.4)
 129                         i++;
 130         }
 131         return i % 8 + 1;
 132 }
 133
 134 /* checks for target bow or stern */
 135 int
 136 gunsbear(struct ship *from, struct ship *to)
 137 {
 138         int Dr, Dc, i;
 139         int ang;
 140
 141         Dr = from->file->row - to->file->row;
 142         Dc = to->file->col - from->file->col;
 143         for (i = 2; i; i--) {
 144                 if ((ang = angle(Dr, Dc) - from->file->dir + 1) < 1)
 145                         ang += 8;
 146                 if (ang >= 2 && ang <= 4)
 147                         return 'r';
 148                 if (ang >= 6 && ang <= 7)
 149                         return 'l';
 150                 Dr += dr[to->file->dir];
 151                 Dc += dc[to->file->dir];
 152         }
 153         return 0;
 154 }
 155
 156 /* returns true if fromship is shooting at onship's starboard side */
 157 int
 158 portside(struct ship *from, struct ship *on, int quick)
 159 {
 160         int ang;
 161         int Dr, Dc;
 162
 163         Dr = from->file->row - on->file->row;
 164         Dc = on->file->col - from->file->col;
 165         if (quick == -1) {
 166                 Dr += dr[on->file->dir];
 167                 Dc += dc[on->file->dir];
 168         }
 169         ang = angle(Dr, Dc);
 170         if (quick != 0)
 171                 return ang;
 172         ang = (ang + 4 - on->file->dir - 1) % 8 + 1;
 173         return ang < 5;
 174 }
 175
 176 int
 177 colours(struct ship *sp)
 178 {
 179         char flag = '\0';
 180
 181         if (sp->file->struck)
 182                 flag = '!';
 183         if (sp->file->explode)
 184                 flag = '#';
 185         if (sp->file->sink)
 186                 flag = '~';
 187         if (sp->file->struck)
 188                 return flag;
 189         flag = *countryname[capship(sp)->nationality];
 190         return sp->file->FS ? flag : tolower(flag);
 191 }
 192
 193 void
 194 logger(struct ship *s)
 195 {
 196         FILE *fp;
 197         int persons;
 198         int n;
 199         struct logs log[NLOG];
 200         float net;
 201         struct logs *lp;
 202
 203         setegid(egid);
 204         if ((fp = fopen(_PATH_LOGFILE, "r+")) == NULL) {
 205                 setegid(gid);
 206                 return;
 207         }
 208         setegid(gid);
 209 #ifdef LOCK_EX
 210         if (flock(fileno(fp), LOCK_EX) < 0)
 211                 return;
 212 #endif
 213         net = (float)s->file->points / s->specs->pts;
 214         persons = getw(fp);
 215         n = fread((char *)log, sizeof(struct logs), NLOG, fp);
 216         for (lp = &log[n]; lp < &log[NLOG]; lp++)
 217                 lp->l_name[0] = lp->l_uid = lp->l_shipnum
 218                         = lp->l_gamenum = lp->l_netpoints = 0;
 219         rewind(fp);
 220         if (persons < 0)
 221                 putw(1, fp);
 222         else
 223                 putw(persons + 1, fp);
 224         for (lp = log; lp < &log[NLOG]; lp++)
 225                 if (net > (float)lp->l_netpoints
 226                     / scene[lp->l_gamenum].ship[lp->l_shipnum].specs->pts) {
 227                         fwrite((char *)log, sizeof (struct logs), lp - log, fp);
 228                         strcpy(log[NLOG-1].l_name, s->file->captain);
 229                         log[NLOG-1].l_uid = getuid();
 230                         log[NLOG-1].l_shipnum = s->file->index;
 231                         log[NLOG-1].l_gamenum = game;
 232                         log[NLOG-1].l_netpoints = s->file->points;
 233                         fwrite((char *)&log[NLOG-1], sizeof (struct logs), 1, fp);
 234                         fwrite((char *)lp, sizeof (struct logs), &log[NLOG-1] - lp, fp);
 235                         break;
 236                 }
 237 #ifdef LOCK_EX
 238         flock(fileno(fp), LOCK_UN);
 239 #endif
 240         fclose(fp);
 241 }