# 2.11BSD#431 - /usr/src/games/sail/misc.c

##### Functions

    angle             X
    closestenemy      X
    colours           X
    gunsbear          X
    log               X
    portside          X
    range             X

##### Macros

    distance          X

       1: /*
       2:  * Copyright (c) 1983 Regents of the University of California.
       3:  * All rights reserved.  The Berkeley software License Agreement
       4:  * specifies the terms and conditions for redistribution.
       5:  */
       6:
       7: #ifndef lint
       8: static char sccsid[] = "@(#)misc.c	5.1 (Berkeley) 5/29/85";
       9: #endif not lint
      10:
      11: #include "externs.h"
      12:
      13: #define distance(x,y) (abs(x) >= abs(y) ? abs(x) + abs(y)/2 : abs(y) + abs(x)/2)
      14:
      15: /* XXX */
      16: range(from, to)
      17: struct ship *from, *to;
      18: {
      19:     register bow1r, bow1c, bow2r, bow2c;
      20:     int stern1r, stern1c, stern2c, stern2r;
      21:     register int bb, bs, sb, ss, result;
      22:
      23:     if (!to->file->dir)
      24:         return -1;
      25:     stern1r = bow1r = from->file->row;
      26:     stern1c = bow1c = from->file->col;
      27:     stern2r = bow2r = to->file->row;
      28:     stern2c = bow2c = to->file->col;
      29:     result = bb = distance(bow2r - bow1r, bow2c - bow1c);
      30:     if (bb < 5) {
      31:         stern2r += dr[to->file->dir];
      32:         stern2c += dc[to->file->dir];
      33:         stern1r += dr[from->file->dir];
      34:         stern1c += dc[from->file->dir];
      35:         bs = distance((bow2r - stern1r), (bow2c - stern1c));
      36:         sb = distance((bow1r - stern2r), (bow1c - stern2c));
      37:         ss = distance((stern2r - stern1r) ,(stern2c - stern1c));
      38:         result = min(bb, min(bs, min(sb, ss)));
      39:     }
      40:     return result;
      41: }
      42:
      43: struct ship *
      44: closestenemy(from, side, anyship)
      45: register struct ship *from;
      46: char side, anyship;
      47: {
      48:     register struct ship *sp;
      49:     register char a;
      50:     int olddist = 30000, dist;
      51:     struct ship *closest = 0;
      52:
      53:     a = capship(from)->nationality;
      54:     foreachship(sp) {
      55:         if (sp == from)
      56:             continue;
      57:         if (sp->file->dir == 0)
      58:             continue;
      59:         if (a == capship(sp)->nationality && !anyship)
      60:             continue;
      61:         if (side && gunsbear(from, sp) != side)
      62:             continue;
      63:         dist = range(from, sp);
      64:         if (dist < olddist) {
      65:             closest = sp;
      66:             olddist = dist;
      67:         }
      68:     }
      69:     return closest;
      70: }
      71:
      72: angle(dr, dc)
      73: register dr, dc;
      74: {
      75:     register i;
      76:
      77:     if (dc >= 0 && dr > 0)
      78:         i = 0;
      79:     else if (dr <= 0 && dc > 0)
      80:         i = 2;
      81:     else if (dc <= 0 && dr < 0)
      82:         i = 4;
      83:     else
      84:         i = 6;
      85:     dr = abs(dr);
      86:     dc = abs(dc);
      87:     if ((i == 0 || i == 4) && dc * 2.4 > dr) {
      88:         i++;
      89:         if (dc > dr * 2.4)
      90:             i++;
      91:     } else if ((i == 2 || i == 6) && dr * 2.4 > dc) {
      92:         i++;
      93:         if (dr > dc * 2.4)
      94:             i++;
      95:     }
      96:     return i % 8 + 1;
      97: }
      98:
      99: gunsbear(from, to)      /* checks for target bow or stern */
     100: register struct ship *from, *to;
     101: {
     102:     int Dr, Dc, i;
     103:     register ang;
     104:
     105:     Dr = from->file->row - to->file->row;
     106:     Dc = to->file->col - from->file->col;
     107:     for (i = 2; i; i--) {
     108:         if ((ang = angle(Dr, Dc) - from->file->dir + 1) < 1)
     109:             ang += 8;
     110:         if (ang >= 2 && ang <= 4)
     111:             return 'r';
     112:         if (ang >= 6 && ang <= 7)
     113:             return 'l';
     114:         Dr += dr[to->file->dir];
     115:         Dc += dc[to->file->dir];
     116:     }
     117:     return 0;
     118: }
     119:
     120: portside(from, on, quick)
     121: register struct ship *from, *on;
     122: int quick;          /* returns true if fromship is */
     123: {               /* shooting at onship's starboard side */
     124:     register ang;
     125:     register Dr, Dc;
     126:
     127:     Dr = from->file->row - on->file->row;
     128:     Dc = on->file->col - from->file->col;
     129:     if (quick == -1) {
     130:         Dr += dr[on->file->dir];
     131:         Dc += dc[on->file->dir];
     132:     }
     133:     ang = angle(Dr, Dc);
     134:     if (quick != 0)
     135:         return ang;
     136:     ang = (ang + 4 - on->file->dir - 1) % 8 + 1;
     137:     return ang < 5;
     138: }
     139:
     140: colours(sp)
     141: register struct ship *sp;
     142: {
     143:     register char flag;
     144:
     145:     if (sp->file->struck)
     146:         flag = '!';
     147:     if (sp->file->explode)
     148:         flag = '#';
     149:     if (sp->file->sink)
     150:         flag = '~';
     151:     if (sp->file->struck)
     152:         return flag;
     153:     flag = *countryname[capship(sp)->nationality];
     154:     return sp->file->FS ? flag : tolower(flag);
     155: }
     156:
     157: #include <sys/file.h>
     158: log(s)
     159: register struct ship *s;
     160: {
     161:     FILE *fp;
     162:     int persons;
     163:     int n;
     164:     struct logs log[NLOG];
     165:     float net;
     166:     register struct logs *lp;
     167:
     168:     if ((fp = fopen(LOGFILE, "r+")) == NULL)
     169:         return;
     170: #ifdef LOCK_EX
     171:     if (flock(fileno(fp), LOCK_EX) < 0)
     172:         return;
     173: #endif
     174:     net = (float)s->file->points / s->specs->pts;
     175:     persons = getw(fp);
     176:     n = fread((char *)log, sizeof(struct logs), NLOG, fp);
     177:     for (lp = &log[n]; lp < &log[NLOG]; lp++)
     178:         lp->l_name[0] = lp->l_uid = lp->l_shipnum
     179:             = lp->l_gamenum = lp->l_netpoints = 0;
     180:     rewind(fp);
     181:     if (persons < 0)
     182:         (void) putw(1, fp);
     183:     else
     184:         (void) putw(persons + 1, fp);
     185:     for (lp = log; lp < &log[NLOG]; lp++)
     186:         if (net > (float)lp->l_netpoints
     187:             / scene[lp->l_gamenum].ship[lp->l_shipnum].specs->pts) {
     188:             (void) fwrite((char *)log,
     189:                 sizeof (struct logs), lp - log, fp);
     190:             (void) strcpy(log[NLOG-1].l_name, s->file->captain);
     191:             log[NLOG-1].l_uid = getuid();
     192:             log[NLOG-1].l_shipnum = s->file->index;
     193:             log[NLOG-1].l_gamenum = game;
     194:             log[NLOG-1].l_netpoints = s->file->points;
     195:             (void) fwrite((char *)&log[NLOG-1],
     196:                 sizeof (struct logs), 1, fp);
     197:             (void) fwrite((char *)lp,
     198:                 sizeof (struct logs), &log[NLOG-1] - lp, fp);
     199:             break;
     200:         }
     201: #ifdef LOCK_EX
     202:     (void) flock(fileno(fp), LOCK_UN);
     203: #endif
     204:     (void) fclose(fp);
     205: }

#### Defined functions

angle defined in line 72; used 2 times

- in line 108, 133

closestenemy defined in line 43; used 7 times

- in /usr/src/games/sail/dr_1.c line 277-280(2)
- in /usr/src/games/sail/dr_3.c line 35, 306
- in /usr/src/games/sail/externs.h line 275
- in /usr/src/games/sail/pl_2.c line 80
- in /usr/src/games/sail/pl_3.c line 58

colours defined in line 140; used 6 times

- in /usr/src/games/sail/pl_4.c line 62
- in /usr/src/games/sail/pl_7.c line 121, 140, 235, 397
- in /usr/src/games/sail/sync.c line 38

gunsbear defined in line 99; used 12 times

- in line 61
- in /usr/src/games/sail/dr_1.c line 300-301(2)
- in /usr/src/games/sail/dr_2.c line 138, 202(2), 220(2), 230(2)
- in /usr/src/games/sail/pl_3.c line 93(2)

log defined in line 158; used 17 times

- in line 164, 176-177(3), 185-198(11)
- in /usr/src/games/sail/dr_1.c line 389
- in /usr/src/games/sail/pl_1.c line 76

portside defined in line 120; used 6 times

- in /usr/src/games/sail/assorted.c line 78, 101
- in /usr/src/games/sail/dr_1.c line 302
- in /usr/src/games/sail/dr_2.c line 140
- in /usr/src/games/sail/pl_3.c line 94
- in /usr/src/games/sail/pl_4.c line 95

range defined in line 16; used 15 times

- in line 63
- in /usr/src/games/sail/dr_1.c line 280-284(3)
- in /usr/src/games/sail/dr_2.c line 28, 67, 136
- in /usr/src/games/sail/dr_3.c line 98-100(2), 168, 308
- in /usr/src/games/sail/pl_3.c line 63, 192
- in /usr/src/games/sail/pl_4.c line 94
- in /usr/src/games/sail/pl_5.c line 148

#### Defined variables

sccsid defined in line 8; never used

#### Defined macros

distance defined in line 13; used 4 times

- in line 29, 35-37(3)

Last modified: 1985-05-30 Generated: 2016-12-26 | Generated by src2html V0.67 page hit count: 1544 |