1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 static char sccsid[] = "@(#)misc.c 5.3 (Berkeley) 06/18/88"; 20 #endif /* not lint */ 21 22 #include "externs.h" 23 24 #define distance(x,y) (abs(x) >= abs(y) ? abs(x) + abs(y)/2 : abs(y) + abs(x)/2) 25 26 /* XXX */ 27 range(from, to) 28 struct ship *from, *to; 29 { 30 register bow1r, bow1c, bow2r, bow2c; 31 int stern1r, stern1c, stern2c, stern2r; 32 register int bb, bs, sb, ss, result; 33 34 if (!to->file->dir) 35 return -1; 36 stern1r = bow1r = from->file->row; 37 stern1c = bow1c = from->file->col; 38 stern2r = bow2r = to->file->row; 39 stern2c = bow2c = to->file->col; 40 result = bb = distance(bow2r - bow1r, bow2c - bow1c); 41 if (bb < 5) { 42 stern2r += dr[to->file->dir]; 43 stern2c += dc[to->file->dir]; 44 stern1r += dr[from->file->dir]; 45 stern1c += dc[from->file->dir]; 46 bs = distance((bow2r - stern1r), (bow2c - stern1c)); 47 sb = distance((bow1r - stern2r), (bow1c - stern2c)); 48 ss = distance((stern2r - stern1r) ,(stern2c - stern1c)); 49 result = min(bb, min(bs, min(sb, ss))); 50 } 51 return result; 52 } 53 54 struct ship * 55 closestenemy(from, side, anyship) 56 register struct ship *from; 57 char side, anyship; 58 { 59 register struct ship *sp; 60 register char a; 61 int olddist = 30000, dist; 62 struct ship *closest = 0; 63 64 a = capship(from)->nationality; 65 foreachship(sp) { 66 if (sp == from) 67 continue; 68 if (sp->file->dir == 0) 69 continue; 70 if (a == capship(sp)->nationality && !anyship) 71 continue; 72 if (side && gunsbear(from, sp) != side) 73 continue; 74 dist = range(from, sp); 75 if (dist < olddist) { 76 closest = sp; 77 olddist = dist; 78 } 79 } 80 return closest; 81 } 82 83 angle(dr, dc) 84 register dr, dc; 85 { 86 register i; 87 88 if (dc >= 0 && dr > 0) 89 i = 0; 90 else if (dr <= 0 && dc > 0) 91 i = 2; 92 else if (dc <= 0 && dr < 0) 93 i = 4; 94 else 95 i = 6; 96 dr = abs(dr); 97 dc = abs(dc); 98 if ((i == 0 || i == 4) && dc * 2.4 > dr) { 99 i++; 100 if (dc > dr * 2.4) 101 i++; 102 } else if ((i == 2 || i == 6) && dr * 2.4 > dc) { 103 i++; 104 if (dr > dc * 2.4) 105 i++; 106 } 107 return i % 8 + 1; 108 } 109 110 gunsbear(from, to) /* checks for target bow or stern */ 111 register struct ship *from, *to; 112 { 113 int Dr, Dc, i; 114 register ang; 115 116 Dr = from->file->row - to->file->row; 117 Dc = to->file->col - from->file->col; 118 for (i = 2; i; i--) { 119 if ((ang = angle(Dr, Dc) - from->file->dir + 1) < 1) 120 ang += 8; 121 if (ang >= 2 && ang <= 4) 122 return 'r'; 123 if (ang >= 6 && ang <= 7) 124 return 'l'; 125 Dr += dr[to->file->dir]; 126 Dc += dc[to->file->dir]; 127 } 128 return 0; 129 } 130 131 portside(from, on, quick) 132 register struct ship *from, *on; 133 int quick; /* returns true if fromship is */ 134 { /* shooting at onship's starboard side */ 135 register ang; 136 register Dr, Dc; 137 138 Dr = from->file->row - on->file->row; 139 Dc = on->file->col - from->file->col; 140 if (quick == -1) { 141 Dr += dr[on->file->dir]; 142 Dc += dc[on->file->dir]; 143 } 144 ang = angle(Dr, Dc); 145 if (quick != 0) 146 return ang; 147 ang = (ang + 4 - on->file->dir - 1) % 8 + 1; 148 return ang < 5; 149 } 150 151 colours(sp) 152 register struct ship *sp; 153 { 154 register char flag; 155 156 if (sp->file->struck) 157 flag = '!'; 158 if (sp->file->explode) 159 flag = '#'; 160 if (sp->file->sink) 161 flag = '~'; 162 if (sp->file->struck) 163 return flag; 164 flag = *countryname[capship(sp)->nationality]; 165 return sp->file->FS ? flag : tolower(flag); 166 } 167 168 #include <sys/file.h> 169 log(s) 170 register struct ship *s; 171 { 172 FILE *fp; 173 int persons; 174 int n; 175 struct logs log[NLOG]; 176 float net; 177 register struct logs *lp; 178 179 if ((fp = fopen(LOGFILE, "r+")) == NULL) 180 return; 181 #ifdef LOCK_EX 182 if (flock(fileno(fp), LOCK_EX) < 0) 183 return; 184 #endif 185 net = (float)s->file->points / s->specs->pts; 186 persons = getw(fp); 187 n = fread((char *)log, sizeof(struct logs), NLOG, fp); 188 for (lp = &log[n]; lp < &log[NLOG]; lp++) 189 lp->l_name[0] = lp->l_uid = lp->l_shipnum 190 = lp->l_gamenum = lp->l_netpoints = 0; 191 rewind(fp); 192 if (persons < 0) 193 (void) putw(1, fp); 194 else 195 (void) putw(persons + 1, fp); 196 for (lp = log; lp < &log[NLOG]; lp++) 197 if (net > (float)lp->l_netpoints 198 / scene[lp->l_gamenum].ship[lp->l_shipnum].specs->pts) { 199 (void) fwrite((char *)log, 200 sizeof (struct logs), lp - log, fp); 201 (void) strcpy(log[NLOG-1].l_name, s->file->captain); 202 log[NLOG-1].l_uid = getuid(); 203 log[NLOG-1].l_shipnum = s->file->index; 204 log[NLOG-1].l_gamenum = game; 205 log[NLOG-1].l_netpoints = s->file->points; 206 (void) fwrite((char *)&log[NLOG-1], 207 sizeof (struct logs), 1, fp); 208 (void) fwrite((char *)lp, 209 sizeof (struct logs), &log[NLOG-1] - lp, fp); 210 break; 211 } 212 #ifdef LOCK_EX 213 (void) flock(fileno(fp), LOCK_UN); 214 #endif 215 (void) fclose(fp); 216 } 217