1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)misc.c 8.2 (Berkeley) 04/28/95"; 10 #endif /* not lint */ 11 12 #include "extern.h" 13 #include "pathnames.h" 14 15 #define distance(x,y) (abs(x) >= abs(y) ? abs(x) + abs(y)/2 : abs(y) + abs(x)/2) 16 17 /* XXX */ 18 range(from, to) 19 struct ship *from, *to; 20 { 21 register bow1r, bow1c, bow2r, bow2c; 22 int stern1r, stern1c, stern2c, stern2r; 23 register int bb, bs, sb, ss, result; 24 25 if (!to->file->dir) 26 return -1; 27 stern1r = bow1r = from->file->row; 28 stern1c = bow1c = from->file->col; 29 stern2r = bow2r = to->file->row; 30 stern2c = bow2c = to->file->col; 31 result = bb = distance(bow2r - bow1r, bow2c - bow1c); 32 if (bb < 5) { 33 stern2r += dr[to->file->dir]; 34 stern2c += dc[to->file->dir]; 35 stern1r += dr[from->file->dir]; 36 stern1c += dc[from->file->dir]; 37 bs = distance((bow2r - stern1r), (bow2c - stern1c)); 38 sb = distance((bow1r - stern2r), (bow1c - stern2c)); 39 ss = distance((stern2r - stern1r) ,(stern2c - stern1c)); 40 result = min(bb, min(bs, min(sb, ss))); 41 } 42 return result; 43 } 44 45 struct ship * 46 closestenemy(from, side, anyship) 47 register struct ship *from; 48 char side, anyship; 49 { 50 register struct ship *sp; 51 register char a; 52 int olddist = 30000, dist; 53 struct ship *closest = 0; 54 55 a = capship(from)->nationality; 56 foreachship(sp) { 57 if (sp == from) 58 continue; 59 if (sp->file->dir == 0) 60 continue; 61 if (a == capship(sp)->nationality && !anyship) 62 continue; 63 if (side && gunsbear(from, sp) != side) 64 continue; 65 dist = range(from, sp); 66 if (dist < olddist) { 67 closest = sp; 68 olddist = dist; 69 } 70 } 71 return closest; 72 } 73 74 angle(dr, dc) 75 register dr, dc; 76 { 77 register i; 78 79 if (dc >= 0 && dr > 0) 80 i = 0; 81 else if (dr <= 0 && dc > 0) 82 i = 2; 83 else if (dc <= 0 && dr < 0) 84 i = 4; 85 else 86 i = 6; 87 dr = abs(dr); 88 dc = abs(dc); 89 if ((i == 0 || i == 4) && dc * 2.4 > dr) { 90 i++; 91 if (dc > dr * 2.4) 92 i++; 93 } else if ((i == 2 || i == 6) && dr * 2.4 > dc) { 94 i++; 95 if (dr > dc * 2.4) 96 i++; 97 } 98 return i % 8 + 1; 99 } 100 101 gunsbear(from, to) /* checks for target bow or stern */ 102 register struct ship *from, *to; 103 { 104 int Dr, Dc, i; 105 register ang; 106 107 Dr = from->file->row - to->file->row; 108 Dc = to->file->col - from->file->col; 109 for (i = 2; i; i--) { 110 if ((ang = angle(Dr, Dc) - from->file->dir + 1) < 1) 111 ang += 8; 112 if (ang >= 2 && ang <= 4) 113 return 'r'; 114 if (ang >= 6 && ang <= 7) 115 return 'l'; 116 Dr += dr[to->file->dir]; 117 Dc += dc[to->file->dir]; 118 } 119 return 0; 120 } 121 122 portside(from, on, quick) 123 register struct ship *from, *on; 124 int quick; /* returns true if fromship is */ 125 { /* shooting at onship's starboard side */ 126 register ang; 127 register Dr, Dc; 128 129 Dr = from->file->row - on->file->row; 130 Dc = on->file->col - from->file->col; 131 if (quick == -1) { 132 Dr += dr[on->file->dir]; 133 Dc += dc[on->file->dir]; 134 } 135 ang = angle(Dr, Dc); 136 if (quick != 0) 137 return ang; 138 ang = (ang + 4 - on->file->dir - 1) % 8 + 1; 139 return ang < 5; 140 } 141 142 colours(sp) 143 register struct ship *sp; 144 { 145 register char flag; 146 147 if (sp->file->struck) 148 flag = '!'; 149 if (sp->file->explode) 150 flag = '#'; 151 if (sp->file->sink) 152 flag = '~'; 153 if (sp->file->struck) 154 return flag; 155 flag = *countryname[capship(sp)->nationality]; 156 return sp->file->FS ? flag : tolower(flag); 157 } 158 159 #include <sys/file.h> 160 log(s) 161 register struct ship *s; 162 { 163 FILE *fp; 164 int persons; 165 int n; 166 struct logs log[NLOG]; 167 float net; 168 register struct logs *lp; 169 170 if ((fp = fopen(_PATH_LOGFILE, "r+")) == NULL) 171 return; 172 #ifdef LOCK_EX 173 if (flock(fileno(fp), LOCK_EX) < 0) 174 return; 175 #endif 176 net = (float)s->file->points / s->specs->pts; 177 persons = getw(fp); 178 n = fread((char *)log, sizeof(struct logs), NLOG, fp); 179 for (lp = &log[n]; lp < &log[NLOG]; lp++) 180 lp->l_name[0] = lp->l_uid = lp->l_shipnum 181 = lp->l_gamenum = lp->l_netpoints = 0; 182 rewind(fp); 183 if (persons < 0) 184 (void) putw(1, fp); 185 else 186 (void) putw(persons + 1, fp); 187 for (lp = log; lp < &log[NLOG]; lp++) 188 if (net > (float)lp->l_netpoints 189 / scene[lp->l_gamenum].ship[lp->l_shipnum].specs->pts) { 190 (void) fwrite((char *)log, 191 sizeof (struct logs), lp - log, fp); 192 (void) strcpy(log[NLOG-1].l_name, s->file->captain); 193 log[NLOG-1].l_uid = getuid(); 194 log[NLOG-1].l_shipnum = s->file->index; 195 log[NLOG-1].l_gamenum = game; 196 log[NLOG-1].l_netpoints = s->file->points; 197 (void) fwrite((char *)&log[NLOG-1], 198 sizeof (struct logs), 1, fp); 199 (void) fwrite((char *)lp, 200 sizeof (struct logs), &log[NLOG-1] - lp, fp); 201 break; 202 } 203 #ifdef LOCK_EX 204 (void) flock(fileno(fp), LOCK_UN); 205 #endif 206 (void) fclose(fp); 207 } 208