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   1 /* src/server/run.c
   2  *
   3  * This file is part of PlomRogue. PlomRogue is licensed under the GPL version 3
   4  * or any later version. For details on its copyright, license, and warranties,
   5  * see the file NOTICE in the root directory of the PlomRogue source package.
   6  */
   7
   8 #define _POSIX_C_SOURCE 200809L /* strdup() */
   9 #include "run.h"
  10 #include <stddef.h> /* NULL */
  11 #include <stdint.h> /* uint8_t, uint16_t, uint32_t, int16_t */
  12 #include <stdio.h> /* FILE, printf(), fflush() */
  13 #include <stdlib.h> /* atoi(), free() */
  14 #include <string.h> /* strlen(), strcmp(), strncmp(), strdup() */
  15 #include <time.h> /* time_t, time() */
  16 #include <unistd.h> /* access() */
  17 #include "../common/parse_file.h" /* set_err_line_options(), token_from_line(),
  18                                    * err_line(), err_line_inc(), parse_val(),
  19                                    * parestest_int()
  20                                    */
  21 #include "../common/readwrite.h" /* try_fopen(), try_fcose(), try_fwrite(),
  22                                   * try_fgets(), textfile_width(), try_fputc(),
  23                                   * atomic_write_finish(), build_temp_path()
  24                                   */
  25 #include "../common/rexit.h" /* exit_trouble(), exit_err() */
  26 #include "../common/try_malloc.h" /* try_malloc() */
  27 #include "ai.h" /* ai() */
  28 #include "cleanup.h" /* unset_cleanup_flag() */
  29 #include "field_of_view.h" /* update_map_memory() */
  30 #include "god_commands.h" /* parse_god_command_(1|2|3)arg() */
  31 #include "hardcoded_strings.h" /* s */
  32 #include "io.h" /* io_round(), save_world() */
  33 #include "thing_actions.h" /* hunger() */
  34 #include "things.h" /* Thing, ThingType, ThingInMemory, get_player(),
  35                      * get_thing_action_id_by_name(), try_thing_proliferation()
  36                      */
  37 #include "world.h" /* world */
  38
  39
  40
  41 /* If "string" and "comparand" match in string, set "c_to_set" to value."  */
  42 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
  43                                              char * c_to_set, char value);
  44
  45 /* Return 1 on world.exists, else 0 and err_line() appropriate error message. */
  46 static uint8_t player_commands_allowed();
  47
  48 /* Parse player commands "tok0" with optional argument "tok1" to player action.
  49  * Return 1 on success, 0 on failure.
  50  */
  51 static uint8_t parse_player_command_0arg(char * tok0);
  52 static uint8_t parse_player_command_1arg(char * tok0, char * tok1);
  53
  54 /* Parse/apply (non-)meta command "tok0" (read further tokens as necessary).
  55  * Return 0 on failure, 1 on success, 2 on QUIT meta command.
  56  */
  57 static uint8_t parse_command_nonmeta(char * tok0);
  58 static uint8_t parse_command_meta(char * tok0);
  59
  60 /* Compare 1st line of server out file to world.server_test, abort if they don't
  61  * match, but not before unsetting flags deleting files in the server directory,
  62  * for in that case those must be assumed to belong to another server process.
  63  */
  64 static void server_test();
  65
  66 /* Return array of IDs of non-owned things in game world, ended by non-ID -1. */
  67 static int16_t * build_whitelist();
  68
  69 /* Return 1 if value of "id" appears in "whitelist", else 0. */
  70 static uint8_t thing_in_whitelist(uint8_t id, int16_t * whitelist);
  71
  72 /* Run the game world and its inhabitants (and their actions) until the player
  73  * avatar is free to receive new commands (or is dead). Only actions and
  74  * proliferations for non-owned things are performed that exist at the start of
  75  * the turn jumped into, or started anew by the cycle.
  76  */
  77 static void turn_over();
  78
  79
  80
  81 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
  82                                              char * c_to_set, char value)
  83 {
  84     if (!strcmp(string, comparand))
  85     {
  86         * c_to_set = value;
  87         return 1;
  88     }
  89     return 0;
  90 }
  91
  92
  93
  94 static uint8_t player_commands_allowed()
  95 {
  96     if (!world.exists)
  97     {
  98         return !err_line(1, "No world exists in which to run player commands.");
  99     }
 100     return 1;
 101 }
 102
 103
 104
 105 static uint8_t parse_player_command_0arg(char * tok0)
 106 {
 107     struct Thing * player = get_player();
 108     if (   !strcmp(tok0, s[S_CMD_WAIT]) || !strcmp(tok0, s[S_CMD_PICKUP])
 109         || !strcmp(tok0, s[S_CMD_AI]))
 110     {
 111         if (player_commands_allowed())
 112         {
 113             if (!strcmp(tok0, s[S_CMD_AI]))
 114             {
 115                 ai(player);
 116             }
 117             else
 118             {
 119                 player->command = get_thing_action_id_by_name(tok0);
 120                 player->arg = 0;
 121             }
 122             turn_over();
 123         }
 124         return 1;
 125     }
 126     return 0;
 127 }
 128
 129
 130
 131 static uint8_t parse_player_command_1arg(char * tok0, char * tok1)
 132 {
 133     struct Thing * player = get_player();
 134     if (   (   parse_val(tok0, tok1, s[S_CMD_DROP], '8', (char *) &player->arg)
 135             || parse_val(tok0, tok1, s[S_CMD_USE], '8', (char *) &player->arg))
 136         && player_commands_allowed())
 137     {
 138         player->command = get_thing_action_id_by_name(tok0);
 139         turn_over();
 140     }
 141     else if (!strcmp(tok0, s[S_CMD_MOVE]) && player_commands_allowed())
 142     {
 143         char dir = '\0';
 144         if (!(   set_char_by_string_comparison(tok1, "east",       &dir, 'd')
 145               || set_char_by_string_comparison(tok1, "south-east", &dir, 'c')
 146               || set_char_by_string_comparison(tok1, "south-west", &dir, 'x')
 147               || set_char_by_string_comparison(tok1, "west",       &dir, 's')
 148               || set_char_by_string_comparison(tok1, "north-west", &dir, 'w')
 149               || set_char_by_string_comparison(tok1, "north-east", &dir, 'e')))
 150         {
 151             return 0;
 152         }
 153         player->arg = dir;
 154         player->command = get_thing_action_id_by_name(tok0);
 155         turn_over();
 156     }
 157     else
 158     {
 159         return 0;
 160     }
 161     return 1;
 162 }
 163
 164
 165
 166 static uint8_t parse_command_nonmeta(char * tok0)
 167 {
 168     if (parse_player_command_0arg(tok0))
 169     {
 170         return 1;
 171     }
 172     else
 173     {
 174         char * tok1 = token_from_line(NULL);
 175         if (tok1 && (   parse_player_command_1arg(tok0, tok1)
 176                      || parse_god_command_1arg(tok0, tok1)))
 177         {
 178             return 1;
 179         }
 180         else
 181         {
 182             char * tok2 = token_from_line(NULL);
 183             if (tok2 && parse_god_command_2arg(tok0, tok1, tok2))
 184             {
 185                 return 1;
 186             }
 187             else
 188             {
 189                 char * tok3 = token_from_line(NULL);
 190                 if (tok2 && parse_god_command_3arg(tok0, tok1, tok2, tok3))
 191                 {
 192                     return 1;
 193                 }
 194             }
 195         }
 196     }
 197     return 0;
 198 }
 199
 200
 201
 202 static uint8_t parse_command_meta(char * tok0)
 203 {
 204     if (!strcmp("QUIT", tok0))
 205     {
 206         return 2;
 207     }
 208     if (!strcmp("PING", tok0))
 209     {
 210         send_to_outfile("PONG\n", 1);
 211         return 1;
 212     }
 213     if (!strcmp("THINGS_HERE", tok0))
 214     {
 215         char * tok1 = token_from_line(NULL);
 216         char * tok2 = token_from_line(NULL);
 217         if (tok1&&tok2 && !parsetest_int(tok1, '8')&&!parsetest_int(tok2, '8'))
 218         {
 219             if (!world.exists)
 220             {
 221                 err_line(1, "Command only works on existing worlds.");
 222                 return 0;
 223             }
 224             send_to_outfile("THINGS_HERE START\n", 1);
 225             struct Thing * player = get_player();
 226             if (player->fov_map &&
 227                 'v' == player->fov_map[atoi(tok1)*world.map.length+atoi(tok2)])
 228             {
 229                 struct Thing * t;
 230                 for (t = world.things; t; t = t->next)
 231                 {
 232                     if (t->pos.y == atoi(tok1) && t->pos.x == atoi(tok2))
 233                     {
 234                         struct ThingType * tt = get_thing_type(t->type);
 235                         send_to_outfile(tt->name, 0);
 236                         send_to_outfile("\n", 1);
 237                     }
 238                 }
 239             }
 240             else
 241             {
 242                 struct ThingInMemory * t_mem;
 243                 for (t_mem = player->t_mem; t_mem; t_mem = t_mem->next)
 244                 {
 245                     if (t_mem->pos.y == atoi(tok1) && t_mem->pos.x == atoi(tok2))
 246                     {
 247                         struct ThingType * tt = get_thing_type(t_mem->type);
 248                         send_to_outfile(tt->name, 0);
 249                         send_to_outfile("\n", 1);
 250                     }
 251                 }
 252             }
 253             send_to_outfile("THINGS_HERE END\n", 1);
 254             return 1;
 255         }
 256     }
 257     return 0;
 258 }
 259
 260
 261
 262 static void server_test()
 263 {
 264     char test[10 + 1 + 10 + 1 + 1];
 265     FILE * file = try_fopen(s[S_PATH_OUT], "r", __func__);
 266     try_fgets(test, 10 + 10 + 1 + 1, file, __func__);
 267     try_fclose(file, __func__);
 268     if (strcmp(test, world.server_test))
 269     {
 270         unset_cleanup_flag(CLEANUP_WORLDSTATE);
 271         unset_cleanup_flag(CLEANUP_OUT);
 272         unset_cleanup_flag(CLEANUP_IN);
 273         char * msg = "Server test string in server output file does not match. "
 274                      "This indicates that the current server process has been "
 275                      "superseded by another one.";
 276         exit_err(1, msg);
 277     }
 278 }
 279
 280
 281
 282 static int16_t * build_whitelist()
 283 {
 284     uint16_t i_things = NULL != world.things;
 285     struct Thing * t = world.things;
 286     for (; t; t = t->next, i_things++);
 287     int16_t * whitelist = try_malloc(i_things * sizeof(int16_t), __func__);
 288     for (i_things = 0, t = world.things; t;
 289          whitelist[i_things] = t->id, t = t->next, i_things++);
 290     whitelist[i_things] = -1;
 291     return whitelist;
 292 }
 293
 294
 295
 296 static uint8_t thing_in_whitelist(uint8_t id, int16_t * whitelist)
 297 {
 298     uint16_t i;
 299     for (i = 0; -1 < whitelist[i]; i++)
 300     {
 301         if ((int16_t) id == whitelist[i])
 302         {
 303             return 1;
 304         }
 305     }
 306     return 0;
 307 }
 308
 309
 310
 311 static void turn_over()
 312 {
 313     struct Thing * player = get_player();
 314     struct Thing * thing = player;
 315     int16_t * whitelist = build_whitelist();
 316     while (0 < player->lifepoints)
 317     {
 318         if (!thing)
 319         {
 320             world.turn++;
 321             thing = world.things;
 322             free(whitelist);
 323             whitelist = build_whitelist();/* The whitelist excludes things    */
 324         }                                 /* that appear only during the turn.*/
 325         if (thing_in_whitelist(thing->id, whitelist))
 326         {
 327             if (0 < thing->lifepoints)
 328             {
 329                 if (0 == thing->command)
 330                 {
 331                     update_map_memory(thing);
 332                     if (thing == player)
 333                     {
 334                         break;
 335                     }
 336                     ai(thing);
 337                 }
 338                 thing->progress++;
 339                 struct ThingAction * ta = get_thing_action(thing->command);
 340                 if (thing->progress == ta->effort)
 341                 {
 342                     ta->func(thing);
 343                     thing->command = 0;
 344                     thing->progress = 0;
 345                 }
 346                 hunger(thing);
 347             }
 348             try_thing_proliferation(thing);
 349         }
 350         thing = thing->next;
 351     }
 352     free(whitelist);
 353 }
 354
 355
 356
 357 extern void send_to_outfile(char * answer, uint8_t flush)
 358 {
 359     try_fwrite(answer, strlen(answer), 1, world.file_out, __func__);
 360     if (flush)
 361     {
 362         fflush(world.file_out);
 363     }
 364 }
 365
 366
 367
 368 extern void record(char * msg, uint8_t force)
 369 {
 370     static FILE * file_tmp = NULL;
 371     static time_t save_wait = 0;
 372     static char * path_tmp;
 373     if (!file_tmp)
 374     {
 375         path_tmp = build_temp_path(s[S_PATH_RECORD]);
 376         file_tmp = try_fopen(path_tmp, "w", __func__);
 377         if (!access(s[S_PATH_RECORD], F_OK))
 378         {
 379             FILE * file_read = try_fopen(s[S_PATH_RECORD], "r", __func__);
 380             uint32_t linemax = textfile_width(file_read);
 381             char * line = try_malloc(linemax + 1, __func__);
 382             while (try_fgets(line, linemax + 1, file_read, __func__))
 383             {
 384                 try_fwrite(line, strlen(line), 1, file_tmp, __func__);
 385             }
 386             free(line);
 387             try_fclose(file_read, __func__);
 388         }
 389     }
 390     if (msg)
 391     {
 392         try_fwrite(msg, strlen(msg), 1, file_tmp, __func__);
 393         try_fputc('\n', file_tmp, __func__);
 394     }
 395     if (force || time(NULL) > save_wait + 15)
 396     {
 397         save_wait = time(NULL);
 398         save_world();
 399         atomic_write_finish(file_tmp, s[S_PATH_RECORD], path_tmp);
 400         file_tmp = NULL;
 401     }
 402 }
 403
 404
 405
 406 extern uint8_t obey_msg(char * msg, uint8_t obey_state)
 407 {
 408     if (world.is_verbose)
 409     {
 410         exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 411     }
 412     set_err_line_options("Trouble with message: ", msg, 0);
 413     char * msg_copy = strdup(msg);
 414     char * tok0 = token_from_line(msg_copy);
 415     uint8_t ret = 0;
 416     if (tok0)
 417     {
 418         ret = parse_command_meta(tok0);
 419         if (ret || (obey_state < 2 && parse_command_nonmeta(tok0)))
 420         {
 421             if (!ret)
 422             {
 423                 if (world.exists)
 424                 {
 425                     world.do_update = 1;
 426                 }
 427                 if (1 == obey_state)
 428                 {
 429                    record(msg, 0);
 430                 }
 431             }
 432             char * tokplus = token_from_line(NULL);
 433             err_line(!(!tokplus), "Too many arguments, ignoring overflow.");
 434         }
 435         else if (world.replay)
 436         {
 437             ret = 3;
 438         }
 439         else if (!world.replay)
 440         {
 441             err_line(1, "Invalid command/argument or bad number of tokens.");
 442         }
 443     }
 444     free(msg_copy);
 445     return ret;
 446 }
 447
 448
 449
 450 extern uint8_t io_loop(uint8_t obey_state)
 451 {
 452     while (1)
 453     {
 454         char * msg = io_round();
 455         server_test();
 456         if (msg)
 457         {
 458             uint8_t ret = obey_msg(msg, obey_state);
 459             free(msg);
 460             if (   (!world.replay && 2 == ret)
 461                 || ( world.replay && 2 <= ret))
 462             {
 463                 return ret;
 464             }
 465         }
 466     }
 467 }