games/sail/sync.c

   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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)sync.c      8.1 (Berkeley) 5/31/93";
  37 #endif
  38 static const char rcsid[] =
  39  "$FreeBSD: src/games/sail/sync.c,v 1.9 1999/11/30 03:49:38 billf Exp $";
  40 #endif /* not lint */
  41
  42 #include "externs.h"
  43 #include <sys/file.h>
  44 #include <sys/errno.h>
  45
  46 #define BUFSIZE 4096
  47
  48 static char sync_buf[BUFSIZE];
  49 static char *sync_bp = sync_buf;
  50 static char sync_lock[25];
  51 static char sync_file[25];
  52 static long sync_seek;
  53 static FILE *sync_fp;
  54 #define SF "/tmp/#sailsink.%d"
  55 #define LF "/tmp/#saillock.%d"
  56
  57 /*VARARGS3*/
  58 makesignal(from, fmt, ship, a, b, c)
  59         struct ship *from;
  60         char *fmt;
  61         struct ship *ship;
  62 {
  63         char message[80];
  64
  65         if (ship == 0)
  66                 (void) sprintf(message, fmt, a, b, c);
  67         else
  68                 (void) sprintf(message, fmt,
  69                         ship->shipname, colours(ship),
  70                         sterncolour(ship), a, b, c);
  71         Write(W_SIGNAL, from, 1, (long)message, 0, 0, 0);
  72 }
  73
  74 #include <sys/types.h>
  75 #include <sys/stat.h>
  76 sync_exists(game)
  77 int game;
  78 {
  79         char buf[sizeof sync_file];
  80         struct stat s;
  81         time_t t;
  82
  83         (void) sprintf(buf, SF, game);
  84         (void) time(&t);
  85         if (stat(buf, &s) < 0)
  86                 return 0;
  87         if (s.st_mtime < t - 60*60*2) {         /* 2 hours */
  88                 (void) unlink(buf);
  89                 (void) sprintf(buf, LF, game);
  90                 (void) unlink(buf);
  91                 return 0;
  92         } else
  93                 return 1;
  94 }
  95
  96 sync_open()
  97 {
  98         if (sync_fp != NULL)
  99                 (void) fclose(sync_fp);
 100         (void) sprintf(sync_lock, LF, game);
 101         (void) sprintf(sync_file, SF, game);
 102         if (access(sync_file, 0) < 0) {
 103                 int omask = umask(issetuid ? 077 : 011);
 104                 sync_fp = fopen(sync_file, "w+");
 105                 (void) umask(omask);
 106         } else
 107                 sync_fp = fopen(sync_file, "r+");
 108         if (sync_fp == NULL)
 109                 return -1;
 110         sync_seek = 0;
 111         return 0;
 112 }
 113
 114 sync_close(remove)
 115         char remove;
 116 {
 117         if (sync_fp != 0)
 118                 (void) fclose(sync_fp);
 119         if (remove)
 120                 (void) unlink(sync_file);
 121 }
 122
 123 Write(type, ship, isstr, a, b, c, d)
 124         int type;
 125         struct ship *ship;
 126         char isstr;
 127         int a, b, c, d;
 128 {
 129         if (isstr)
 130                 (void) sprintf(sync_bp, "%d %d %d %s\n",
 131                         type, ship->file->index, isstr, (char *)a);
 132         else
 133                 (void) sprintf(sync_bp, "%d %d %d %d %d %d %d\n",
 134                         type, ship->file->index, isstr, a, b, c, d);
 135         while (*sync_bp++)
 136                 ;
 137         sync_bp--;
 138         if (sync_bp >= &sync_buf[sizeof sync_buf])
 139                 abort();
 140         (void) sync_update(type, ship, a, b, c, d);
 141 }
 142
 143 Sync()
 144 {
 145         sig_t sighup, sigint;
 146         int n;
 147         int type, shipnum, isstr, a, b, c, d;
 148         char buf[80];
 149         char erred = 0;
 150         extern errno;
 151
 152         sighup = signal(SIGHUP, SIG_IGN);
 153         sigint = signal(SIGINT, SIG_IGN);
 154         for (n = TIMEOUT; --n >= 0;) {
 155 #ifdef LOCK_EX
 156                 if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
 157                         break;
 158                 if (errno != EWOULDBLOCK)
 159                         return -1;
 160 #else
 161                 if (link(sync_file, sync_lock) >= 0)
 162                         break;
 163                 if (errno != EEXIST)
 164                         return -1;
 165 #endif
 166                 sleep(1);
 167         }
 168         if (n <= 0)
 169                 return -1;
 170         (void) fseek(sync_fp, sync_seek, 0);
 171         for (;;) {
 172                 switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
 173                 case 3:
 174                         break;
 175                 case EOF:
 176                         goto out;
 177                 default:
 178                         goto bad;
 179                 }
 180                 if (shipnum < 0 || shipnum >= cc->vessels)
 181                         goto bad;
 182                 if (isstr != 0 && isstr != 1)
 183                         goto bad;
 184                 if (isstr) {
 185                         char *p;
 186                         for (p = buf;;) {
 187                                 switch (*p++ = getc(sync_fp)) {
 188                                 case '\n':
 189                                         p--;
 190                                 case EOF:
 191                                         break;
 192                                 default:
 193                                         if (p >= buf + sizeof buf)
 194                                                 p--;
 195                                         continue;
 196                                 }
 197                                 break;
 198                         }
 199                         *p = 0;
 200                         for (p = buf; *p == ' '; p++)
 201                                 ;
 202                         a = (long)p;
 203                         b = c = d = 0;
 204                 } else
 205                         if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
 206                                 goto bad;
 207                 if (sync_update(type, SHIP(shipnum), a, b, c, d) < 0)
 208                         goto bad;
 209         }
 210 bad:
 211         erred++;
 212 out:
 213         if (!erred && sync_bp != sync_buf) {
 214                 (void) fseek(sync_fp, 0L, 2);
 215                 (void) fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
 216                         sync_fp);
 217                 (void) fflush(sync_fp);
 218                 sync_bp = sync_buf;
 219         }
 220         sync_seek = ftell(sync_fp);
 221 #ifdef LOCK_EX
 222         (void) flock(fileno(sync_fp), LOCK_UN);
 223 #else
 224         (void) unlink(sync_lock);
 225 #endif
 226         (void) signal(SIGHUP, sighup);
 227         (void) signal(SIGINT, sigint);
 228         return erred ? -1 : 0;
 229 }
 230
 231 sync_update(type, ship, a, b, c, d)
 232         int type;
 233         struct ship *ship;
 234         long a, b, c, d;
 235 {
 236         switch (type) {
 237         case W_DBP: {
 238                 struct BP *p = &ship->file->DBP[a];
 239                 p->turnsent = b;
 240                 p->toship = SHIP(c);
 241                 p->mensent = d;
 242                 break;
 243                 }
 244         case W_OBP: {
 245                 struct BP *p = &ship->file->OBP[a];
 246                 p->turnsent = b;
 247                 p->toship = SHIP(c);
 248                 p->mensent = d;
 249                 break;
 250                 }
 251         case W_FOUL: {
 252                 struct snag *p = &ship->file->foul[a];
 253                 if (SHIP(a)->file->dir == 0)
 254                         break;
 255                 if (p->sn_count++ == 0)
 256                         p->sn_turn = turn;
 257                 ship->file->nfoul++;
 258                 break;
 259                 }
 260         case W_GRAP: {
 261                 struct snag *p = &ship->file->grap[a];
 262                 if (SHIP(a)->file->dir == 0)
 263                         break;
 264                 if (p->sn_count++ == 0)
 265                         p->sn_turn = turn;
 266                 ship->file->ngrap++;
 267                 break;
 268                 }
 269         case W_UNFOUL: {
 270                 struct snag *p = &ship->file->foul[a];
 271                 if (p->sn_count > 0) {
 272                         if (b) {
 273                                 ship->file->nfoul -= p->sn_count;
 274                                 p->sn_count = 0;
 275                         } else {
 276                                 ship->file->nfoul--;
 277                                 p->sn_count--;
 278                         }
 279                 }
 280                 break;
 281                 }
 282         case W_UNGRAP: {
 283                 struct snag *p = &ship->file->grap[a];
 284                 if (p->sn_count > 0) {
 285                         if (b) {
 286                                 ship->file->ngrap -= p->sn_count;
 287                                 p->sn_count = 0;
 288                         } else {
 289                                 ship->file->ngrap--;
 290                                 p->sn_count--;
 291                         }
 292                 }
 293                 break;
 294                 }
 295         case W_SIGNAL:
 296                 if (mode == MODE_PLAYER) {
 297                         if (nobells)
 298                                 Signal("%s (%c%c): %s", ship, a);
 299                         else
 300                                 Signal("\7%s (%c%c): %s", ship, a);
 301                 }
 302                 break;
 303         case W_CREW: {
 304                 struct shipspecs *s = ship->specs;
 305                 s->crew1 = a;
 306                 s->crew2 = b;
 307                 s->crew3 = c;
 308                 break;
 309                 }
 310         case W_CAPTAIN:
 311                 (void) strncpy(ship->file->captain, (char *)a,
 312                         sizeof ship->file->captain - 1);
 313                 ship->file->captain[sizeof ship->file->captain - 1] = 0;
 314                 break;
 315         case W_CAPTURED:
 316                 if (a < 0)
 317                         ship->file->captured = 0;
 318                 else
 319                         ship->file->captured = SHIP(a);
 320                 break;
 321         case W_CLASS:
 322                 ship->specs->class = a;
 323                 break;
 324         case W_DRIFT:
 325                 ship->file->drift = a;
 326                 break;
 327         case W_EXPLODE:
 328                 if ((ship->file->explode = a) == 2)
 329                         ship->file->dir = 0;
 330                 break;
 331         case W_FS:
 332                 ship->file->FS = a;
 333                 break;
 334         case W_GUNL: {
 335                 struct shipspecs *s = ship->specs;
 336                 s->gunL = a;
 337                 s->carL = b;
 338                 break;
 339                 }
 340         case W_GUNR: {
 341                 struct shipspecs *s = ship->specs;
 342                 s->gunR = a;
 343                 s->carR = b;
 344                 break;
 345                 }
 346         case W_HULL:
 347                 ship->specs->hull = a;
 348                 break;
 349         case W_MOVE:
 350                 (void) strncpy(ship->file->movebuf, (char *)a,
 351                         sizeof ship->file->movebuf - 1);
 352                 ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
 353                 break;
 354         case W_PCREW:
 355                 ship->file->pcrew = a;
 356                 break;
 357         case W_POINTS:
 358                 ship->file->points = a;
 359                 break;
 360         case W_QUAL:
 361                 ship->specs->qual = a;
 362                 break;
 363         case W_RIGG: {
 364                 struct shipspecs *s = ship->specs;
 365                 s->rig1 = a;
 366                 s->rig2 = b;
 367                 s->rig3 = c;
 368                 s->rig4 = d;
 369                 break;
 370                 }
 371         case W_RIG1:
 372                 ship->specs->rig1 = a;
 373                 break;
 374         case W_RIG2:
 375                 ship->specs->rig2 = a;
 376                 break;
 377         case W_RIG3:
 378                 ship->specs->rig3 = a;
 379                 break;
 380         case W_RIG4:
 381                 ship->specs->rig4 = a;
 382                 break;
 383         case W_COL:
 384                 ship->file->col = a;
 385                 break;
 386         case W_DIR:
 387                 ship->file->dir = a;
 388                 break;
 389         case W_ROW:
 390                 ship->file->row = a;
 391                 break;
 392         case W_SINK:
 393                 if ((ship->file->sink = a) == 2)
 394                         ship->file->dir = 0;
 395                 break;
 396         case W_STRUCK:
 397                 ship->file->struck = a;
 398                 break;
 399         case W_TA:
 400                 ship->specs->ta = a;
 401                 break;
 402         case W_ALIVE:
 403                 alive = 1;
 404                 break;
 405         case W_TURN:
 406                 turn = a;
 407                 break;
 408         case W_WIND:
 409                 winddir = a;
 410                 windspeed = b;
 411                 break;
 412         case W_BEGIN:
 413                 (void) strcpy(ship->file->captain, "begin");
 414                 people++;
 415                 break;
 416         case W_END:
 417                 *ship->file->captain = 0;
 418                 ship->file->points = 0;
 419                 people--;
 420                 break;
 421         case W_DDEAD:
 422                 hasdriver = 0;
 423                 break;
 424         default:
 425                 fprintf(stderr, "sync_update: unknown type %d\r\n", type);
 426                 return -1;
 427         }
 428         return 0;
 429 }