1 /*- 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)misc.c 8.1 (Berkeley) 5/31/93 30 * $FreeBSD: src/games/sail/misc.c,v 1.5 1999/11/30 03:49:34 billf Exp $ 31 * $DragonFly: src/games/sail/misc.c,v 1.4 2006/09/03 17:33:13 pavalos Exp $ 32 */ 33 34 #include <sys/file.h> 35 #include "externs.h" 36 #include "pathnames.h" 37 38 #define distance(x,y) \ 39 (abs(x) >= abs(y) ? abs(x) + abs(y)/2 : abs(y) + abs(x)/2) 40 41 static int angle(int, int); 42 43 /* XXX */ 44 int 45 range(struct ship *from, struct ship *to) 46 { 47 int bow1r, bow1c, bow2r, bow2c; 48 int stern1r, stern1c, stern2c, stern2r; 49 int bb, bs, sb, ss, result; 50 51 if (!to->file->dir) 52 return -1; 53 stern1r = bow1r = from->file->row; 54 stern1c = bow1c = from->file->col; 55 stern2r = bow2r = to->file->row; 56 stern2c = bow2c = to->file->col; 57 result = bb = distance(bow2r - bow1r, bow2c - bow1c); 58 if (bb < 5) { 59 stern2r += dr[to->file->dir]; 60 stern2c += dc[to->file->dir]; 61 stern1r += dr[from->file->dir]; 62 stern1c += dc[from->file->dir]; 63 bs = distance((bow2r - stern1r), (bow2c - stern1c)); 64 sb = distance((bow1r - stern2r), (bow1c - stern2c)); 65 ss = distance((stern2r - stern1r) ,(stern2c - stern1c)); 66 result = min(bb, min(bs, min(sb, ss))); 67 } 68 return result; 69 } 70 71 struct ship * 72 closestenemy(struct ship *from, char side, char anyship) 73 { 74 struct ship *sp; 75 char a; 76 int olddist = 30000, dist; 77 struct ship *closest = 0; 78 79 a = capship(from)->nationality; 80 foreachship(sp) { 81 if (sp == from) 82 continue; 83 if (sp->file->dir == 0) 84 continue; 85 if (a == capship(sp)->nationality && !anyship) 86 continue; 87 if (side && gunsbear(from, sp) != side) 88 continue; 89 dist = range(from, sp); 90 if (dist < olddist) { 91 closest = sp; 92 olddist = dist; 93 } 94 } 95 return closest; 96 } 97 98 static int 99 angle(int Dr, int Dc) 100 { 101 int i; 102 103 if (Dc >= 0 && Dr > 0) 104 i = 0; 105 else if (Dr <= 0 && Dc > 0) 106 i = 2; 107 else if (Dc <= 0 && Dr < 0) 108 i = 4; 109 else 110 i = 6; 111 Dr = abs(Dr); 112 Dc = abs(Dc); 113 if ((i == 0 || i == 4) && Dc * 2.4 > Dr) { 114 i++; 115 if (Dc > Dr * 2.4) 116 i++; 117 } else if ((i == 2 || i == 6) && Dr * 2.4 > Dc) { 118 i++; 119 if (Dr > Dc * 2.4) 120 i++; 121 } 122 return i % 8 + 1; 123 } 124 125 /* checks for target bow or stern */ 126 char 127 gunsbear(struct ship *from, struct ship *to) 128 { 129 int Dr, Dc, i; 130 int ang; 131 132 Dr = from->file->row - to->file->row; 133 Dc = to->file->col - from->file->col; 134 for (i = 2; i; i--) { 135 if ((ang = angle(Dr, Dc) - from->file->dir + 1) < 1) 136 ang += 8; 137 if (ang >= 2 && ang <= 4) 138 return 'r'; 139 if (ang >= 6 && ang <= 7) 140 return 'l'; 141 Dr += dr[to->file->dir]; 142 Dc += dc[to->file->dir]; 143 } 144 return 0; 145 } 146 147 /* returns true if fromship is shooting at onship's starboard side */ 148 int 149 portside(struct ship *from, struct ship *on, int quick) 150 { 151 int ang; 152 int Dr, Dc; 153 154 Dr = from->file->row - on->file->row; 155 Dc = on->file->col - from->file->col; 156 if (quick == -1) { 157 Dr += dr[on->file->dir]; 158 Dc += dc[on->file->dir]; 159 } 160 ang = angle(Dr, Dc); 161 if (quick != 0) 162 return ang; 163 ang = (ang + 4 - on->file->dir - 1) % 8 + 1; 164 return ang < 5; 165 } 166 167 char 168 colours(struct ship *sp) 169 { 170 char flag = '\0'; 171 172 if (sp->file->struck) 173 flag = '!'; 174 if (sp->file->explode) 175 flag = '#'; 176 if (sp->file->sink) 177 flag = '~'; 178 if (sp->file->struck) 179 return flag; 180 flag = *countryname[capship(sp)->nationality]; 181 return sp->file->FS ? flag : tolower(flag); 182 } 183 184 void 185 write_log(struct ship *s) 186 { 187 FILE *fp; 188 int persons; 189 int n; 190 struct logs log[NLOG]; 191 float net; 192 struct logs *lp; 193 194 if ((fp = fopen(_PATH_LOGFILE, "r+")) == NULL) 195 return; 196 #ifdef LOCK_EX 197 if (flock(fileno(fp), LOCK_EX) < 0) 198 return; 199 #endif 200 net = (float)s->file->points / s->specs->pts; 201 persons = getw(fp); 202 n = fread((char *)log, sizeof(struct logs), NLOG, fp); 203 for (lp = &log[n]; lp < &log[NLOG]; lp++) 204 lp->l_name[0] = lp->l_uid = lp->l_shipnum 205 = lp->l_gamenum = lp->l_netpoints = 0; 206 rewind(fp); 207 if (persons < 0) 208 putw(1, fp); 209 else 210 putw(persons + 1, fp); 211 for (lp = log; lp < &log[NLOG]; lp++) 212 if (net > (float)lp->l_netpoints 213 / scene[lp->l_gamenum].ship[lp->l_shipnum].specs->pts) { 214 fwrite((char *)log, 215 sizeof (struct logs), lp - log, fp); 216 strcpy(log[NLOG-1].l_name, s->file->captain); 217 log[NLOG-1].l_uid = getuid(); 218 log[NLOG-1].l_shipnum = s->file->index; 219 log[NLOG-1].l_gamenum = game; 220 log[NLOG-1].l_netpoints = s->file->points; 221 fwrite((char *)&log[NLOG-1], 222 sizeof (struct logs), 1, fp); 223 fwrite((char *)lp, 224 sizeof (struct logs), &log[NLOG-1] - lp, fp); 225 break; 226 } 227 #ifdef LOCK_EX 228 flock(fileno(fp), LOCK_UN); 229 #endif 230 fclose(fp); 231 } 232