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