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  * @(#)sync.c   8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/sail/sync.c,v 1.9 1999/11/30 03:49:38 billf Exp $
  35  * $DragonFly: src/games/sail/sync.c,v 1.4 2006/09/03 17:33:13 pavalos Exp $
  36  */
  37
  38 #include "externs.h"
  39 #include <sys/file.h>
  40 #include <sys/errno.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43
  44 #define BUFSIZE 4096
  45
  46 static char sync_buf[BUFSIZE];
  47 static char *sync_bp = sync_buf;
  48 static char sync_lock[25];
  49 static char sync_file[25];
  50 static long sync_seek;
  51 static FILE *sync_fp;
  52 #define SF "/tmp/#sailsink.%d"
  53 #define LF "/tmp/#saillock.%d"
  54
  55 static int      sync_update(int, struct ship *, const char *, long, long, long,
  56                             long);
  57
  58 void
  59 fmtship(char *buf, size_t len, const char *fmt, struct ship *ship)
  60 {
  61         while (*fmt) {
  62                 if (len-- == 0) {
  63                         *buf = '\0';
  64                         return;
  65                 }
  66                 if (*fmt == '$' && fmt[1] == '$') {
  67                         size_t l = snprintf(buf, len, "%s (%c%c)",
  68                             ship->shipname, colours(ship), sterncolour(ship));
  69                         buf += l;
  70                         len -= l - 1;
  71                         fmt += 2;
  72                 }
  73                 else
  74                         *buf++ = *fmt++;
  75         }
  76
  77         if (len > 0)
  78                 *buf = '\0';
  79 }
  80
  81 /*VARARGS3*/
  82 void
  83 makesignal(struct ship *from, const char *fmt, struct ship *ship, ...)
  84 {
  85         char message[80];
  86         char format[BUFSIZ];
  87         va_list ap;
  88
  89         va_start(ap, ship);
  90         if (ship == 0)
  91                 vsprintf(message, fmt, ap);
  92         else {
  93                 fmtship(format, sizeof(format), fmt, ship);
  94                 vsprintf(message, format, ap);
  95         }
  96         va_end(ap);
  97         Writestr(W_SIGNAL, from, message);
  98 }
  99
 100 bool
 101 sync_exists(int lgame)
 102 {
 103         char buf[sizeof sync_file];
 104         struct stat s;
 105         time_t t;
 106
 107         sprintf(buf, SF, game);
 108         time(&t);
 109         if (stat(buf, &s) < 0)
 110                 return 0;
 111         if (s.st_mtime < t - 60*60*2) {         /* 2 hours */
 112                 unlink(buf);
 113                 sprintf(buf, LF, lgame);
 114                 unlink(buf);
 115                 return 0;
 116         } else
 117                 return 1;
 118 }
 119
 120 int
 121 sync_open(void)
 122 {
 123         if (sync_fp != NULL)
 124                 fclose(sync_fp);
 125         sprintf(sync_lock, LF, game);
 126         sprintf(sync_file, SF, game);
 127         if (access(sync_file, 0) < 0) {
 128                 int omask = umask(issetuid ? 077 : 011);
 129                 sync_fp = fopen(sync_file, "w+");
 130                 umask(omask);
 131         } else
 132                 sync_fp = fopen(sync_file, "r+");
 133         if (sync_fp == NULL)
 134                 return -1;
 135         sync_seek = 0;
 136         return 0;
 137 }
 138
 139 void
 140 sync_close(char rm)
 141 {
 142         if (sync_fp != 0)
 143                 fclose(sync_fp);
 144         if (rm)
 145                 unlink(sync_file);
 146 }
 147
 148 void
 149 Write(int type, struct ship *ship, int a, int b, int c, int d)
 150 {
 151         sprintf(sync_bp, "%d %d 0 %d %d %d %d\n",
 152                 type, ship->file->index, a, b, c, d);
 153         while (*sync_bp++)
 154                 ;
 155         sync_bp--;
 156         if (sync_bp >= &sync_buf[sizeof sync_buf])
 157                 abort();
 158         sync_update(type, ship, NULL, a, b, c, d);
 159 }
 160
 161 void
 162 Writestr(int type, struct ship *ship, const char *a)
 163 {
 164         sprintf(sync_bp, "%d %d 1 %s\n", type, ship->file->index, a);
 165         while (*sync_bp++)
 166                 ;
 167         sync_bp--;
 168         if (sync_bp >= &sync_buf[sizeof sync_buf])
 169                 abort();
 170         sync_update(type, ship, a, 0, 0, 0, 0);
 171 }
 172
 173 int
 174 Sync(void)
 175 {
 176         sig_t sighup, sigint;
 177         int n;
 178         int type, shipnum, isstr, a, b, c, d;
 179         char *astr;
 180         char buf[80];
 181         char erred = 0;
 182         sighup = signal(SIGHUP, SIG_IGN);
 183         sigint = signal(SIGINT, SIG_IGN);
 184         for (n = TIMEOUT; --n >= 0;) {
 185 #ifdef LOCK_EX
 186                 if (flock(fileno(sync_fp), LOCK_EX|LOCK_NB) >= 0)
 187                         break;
 188                 if (errno != EWOULDBLOCK)
 189                         return -1;
 190 #else
 191                 if (link(sync_file, sync_lock) >= 0)
 192                         break;
 193                 if (errno != EEXIST)
 194                         return -1;
 195 #endif
 196                 sleep(1);
 197         }
 198         if (n <= 0)
 199                 return -1;
 200         fseek(sync_fp, sync_seek, 0);
 201         for (;;) {
 202                 switch (fscanf(sync_fp, "%d%d%d", &type, &shipnum, &isstr)) {
 203                 case 3:
 204                         break;
 205                 case EOF:
 206                         goto out;
 207                 default:
 208                         goto bad;
 209                 }
 210                 if (shipnum < 0 || shipnum >= cc->vessels)
 211                         goto bad;
 212                 if (isstr != 0 && isstr != 1)
 213                         goto bad;
 214                 if (isstr) {
 215                         char *p;
 216                         for (p = buf;;) {
 217                                 switch (*p++ = getc(sync_fp)) {
 218                                 case '\n':
 219                                         p--;
 220                                 case EOF:
 221                                         break;
 222                                 default:
 223                                         if (p >= buf + sizeof buf)
 224                                                 p--;
 225                                         continue;
 226                                 }
 227                                 break;
 228                         }
 229                         *p = 0;
 230                         for (p = buf; *p == ' '; p++)
 231                                 ;
 232                         astr = p;
 233                         a = b = c = d = 0;
 234                 } else {
 235                         if (fscanf(sync_fp, "%d%d%d%d", &a, &b, &c, &d) != 4)
 236                                 goto bad;
 237                         astr = NULL;
 238                 }
 239                 if (sync_update(type, SHIP(shipnum), astr, a, b, c, d) < 0)
 240                         goto bad;
 241         }
 242 bad:
 243         erred++;
 244 out:
 245         if (!erred && sync_bp != sync_buf) {
 246                 fseek(sync_fp, 0L, SEEK_END);
 247                 fwrite(sync_buf, sizeof *sync_buf, sync_bp - sync_buf,
 248                         sync_fp);
 249                 fflush(sync_fp);
 250                 sync_bp = sync_buf;
 251         }
 252         sync_seek = ftell(sync_fp);
 253 #ifdef LOCK_EX
 254         flock(fileno(sync_fp), LOCK_UN);
 255 #else
 256         unlink(sync_lock);
 257 #endif
 258         signal(SIGHUP, sighup);
 259         signal(SIGINT, sigint);
 260         return erred ? -1 : 0;
 261 }
 262
 263 static int
 264 sync_update(int type, struct ship *ship, const char *astr, long a, long b,
 265             long c, long d)
 266 {
 267         switch (type) {
 268         case W_DBP: {
 269                 struct BP *p = &ship->file->DBP[a];
 270                 p->turnsent = b;
 271                 p->toship = SHIP(c);
 272                 p->mensent = d;
 273                 break;
 274                 }
 275         case W_OBP: {
 276                 struct BP *p = &ship->file->OBP[a];
 277                 p->turnsent = b;
 278                 p->toship = SHIP(c);
 279                 p->mensent = d;
 280                 break;
 281                 }
 282         case W_FOUL: {
 283                 struct snag *p = &ship->file->foul[a];
 284                 if (SHIP(a)->file->dir == 0)
 285                         break;
 286                 if (p->sn_count++ == 0)
 287                         p->sn_turn = turn;
 288                 ship->file->nfoul++;
 289                 break;
 290                 }
 291         case W_GRAP: {
 292                 struct snag *p = &ship->file->grap[a];
 293                 if (SHIP(a)->file->dir == 0)
 294                         break;
 295                 if (p->sn_count++ == 0)
 296                         p->sn_turn = turn;
 297                 ship->file->ngrap++;
 298                 break;
 299                 }
 300         case W_UNFOUL: {
 301                 struct snag *p = &ship->file->foul[a];
 302                 if (p->sn_count > 0) {
 303                         if (b) {
 304                                 ship->file->nfoul -= p->sn_count;
 305                                 p->sn_count = 0;
 306                         } else {
 307                                 ship->file->nfoul--;
 308                                 p->sn_count--;
 309                         }
 310                 }
 311                 break;
 312                 }
 313         case W_UNGRAP: {
 314                 struct snag *p = &ship->file->grap[a];
 315                 if (p->sn_count > 0) {
 316                         if (b) {
 317                                 ship->file->ngrap -= p->sn_count;
 318                                 p->sn_count = 0;
 319                         } else {
 320                                 ship->file->ngrap--;
 321                                 p->sn_count--;
 322                         }
 323                 }
 324                 break;
 325                 }
 326         case W_SIGNAL:
 327                 if (mode == MODE_PLAYER) {
 328                         if (nobells)
 329                                 Signal("%s (%c%c): %s", ship, astr);
 330                         else
 331                                 Signal("\7%s (%c%c): %s", ship, astr);
 332                 }
 333                 break;
 334         case W_CREW: {
 335                 struct shipspecs *s = ship->specs;
 336                 s->crew1 = a;
 337                 s->crew2 = b;
 338                 s->crew3 = c;
 339                 break;
 340                 }
 341         case W_CAPTAIN:
 342                 strncpy(ship->file->captain, astr,
 343                         sizeof ship->file->captain - 1);
 344                 ship->file->captain[sizeof ship->file->captain - 1] = 0;
 345                 break;
 346         case W_CAPTURED:
 347                 if (a < 0)
 348                         ship->file->captured = 0;
 349                 else
 350                         ship->file->captured = SHIP(a);
 351                 break;
 352         case W_CLASS:
 353                 ship->specs->class = a;
 354                 break;
 355         case W_DRIFT:
 356                 ship->file->drift = a;
 357                 break;
 358         case W_EXPLODE:
 359                 if ((ship->file->explode = a) == 2)
 360                         ship->file->dir = 0;
 361                 break;
 362         case W_FS:
 363                 ship->file->FS = a;
 364                 break;
 365         case W_GUNL: {
 366                 struct shipspecs *s = ship->specs;
 367                 s->gunL = a;
 368                 s->carL = b;
 369                 break;
 370                 }
 371         case W_GUNR: {
 372                 struct shipspecs *s = ship->specs;
 373                 s->gunR = a;
 374                 s->carR = b;
 375                 break;
 376                 }
 377         case W_HULL:
 378                 ship->specs->hull = a;
 379                 break;
 380         case W_MOVE:
 381                 strncpy(ship->file->movebuf, astr,
 382                         sizeof ship->file->movebuf - 1);
 383                 ship->file->movebuf[sizeof ship->file->movebuf - 1] = 0;
 384                 break;
 385         case W_PCREW:
 386                 ship->file->pcrew = a;
 387                 break;
 388         case W_POINTS:
 389                 ship->file->points = a;
 390                 break;
 391         case W_QUAL:
 392                 ship->specs->qual = a;
 393                 break;
 394         case W_RIGG: {
 395                 struct shipspecs *s = ship->specs;
 396                 s->rig1 = a;
 397                 s->rig2 = b;
 398                 s->rig3 = c;
 399                 s->rig4 = d;
 400                 break;
 401                 }
 402         case W_RIG1:
 403                 ship->specs->rig1 = a;
 404                 break;
 405         case W_RIG2:
 406                 ship->specs->rig2 = a;
 407                 break;
 408         case W_RIG3:
 409                 ship->specs->rig3 = a;
 410                 break;
 411         case W_RIG4:
 412                 ship->specs->rig4 = a;
 413                 break;
 414         case W_COL:
 415                 ship->file->col = a;
 416                 break;
 417         case W_DIR:
 418                 ship->file->dir = a;
 419                 break;
 420         case W_ROW:
 421                 ship->file->row = a;
 422                 break;
 423         case W_SINK:
 424                 if ((ship->file->sink = a) == 2)
 425                         ship->file->dir = 0;
 426                 break;
 427         case W_STRUCK:
 428                 ship->file->struck = a;
 429                 break;
 430         case W_TA:
 431                 ship->specs->ta = a;
 432                 break;
 433         case W_ALIVE:
 434                 alive = 1;
 435                 break;
 436         case W_TURN:
 437                 turn = a;
 438                 break;
 439         case W_WIND:
 440                 winddir = a;
 441                 windspeed = b;
 442                 break;
 443         case W_BEGIN:
 444                 strcpy(ship->file->captain, "begin");
 445                 people++;
 446                 break;
 447         case W_END:
 448                 *ship->file->captain = 0;
 449                 ship->file->points = 0;
 450                 people--;
 451                 break;
 452         case W_DDEAD:
 453                 hasdriver = 0;
 454                 break;
 455         default:
 456                 fprintf(stderr, "sync_update: unknown type %d\r\n", type);
 457                 return -1;
 458         }
 459         return 0;
 460 }