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