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