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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 command "tok0" with no argument to player action. */
  46 static uint8_t parse_player_command_0arg(char * tok0);
  47
  48 /* Parse player command "tok0" with one argument "tok1" to player action. */
  49 static uint8_t parse_player_command_1arg(char * tok0, char * tok1);
  50
  51 /* Parse/apply command "tok0" (read further tokens as necessary). */
  52 static uint8_t parse_command(char * tok0);
  53
  54 /* Compares first line of server out file to world.server_test, aborts if they
  55  * don't match, but not before unsetting the flags deleting files in the server
  56  * directory, for in that case those must be assumed to belong to another server
  57  * process.
  58  */
  59 static void server_test();
  60
  61 /* Return array of IDs of non-owned things in game world, ended by non-ID -1. */
  62 static int16_t * build_whitelist();
  63
  64 /* Return 1 if value of "id" appears in "whitelist", else 0. */
  65 static uint8_t thing_in_whitelist(uint8_t id, int16_t * whitelist);
  66
  67 /* Run the game world and its inhabitants (and their actions) until the player
  68  * avatar is free to receive new commands (or is dead). Only actions and
  69  * proliferations for non-owned things are performed that exist at the start of
  70  * the turn jumped into, or started anew by the cycle.
  71  */
  72 static void turn_over();
  73
  74 /* Try to read "msg" as meta command, act accordingly; on success, free it. */
  75 static uint8_t meta_commands(char * msg);
  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(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 void server_test()
 201 {
 202     char test[10 + 1 + 10 + 1 + 1];
 203     FILE * file = try_fopen(s[S_PATH_OUT], "r", __func__);
 204     try_fgets(test, 10 + 10 + 1 + 1, file, __func__);
 205     try_fclose(file, __func__);
 206     if (strcmp(test, world.server_test))
 207     {
 208         unset_cleanup_flag(CLEANUP_WORLDSTATE);
 209         unset_cleanup_flag(CLEANUP_OUT);
 210         unset_cleanup_flag(CLEANUP_IN);
 211         char * msg = "Server test string in server output file does not match. "
 212                      "This indicates that the current server process has been "
 213                      "superseded by another one.";
 214         exit_err(1, msg);
 215     }
 216 }
 217
 218
 219
 220 static int16_t * build_whitelist()
 221 {
 222     uint16_t i_things = NULL != world.things;
 223     struct Thing * t = world.things;
 224     for (; t; t = t->next, i_things++);
 225     int16_t * whitelist = try_malloc(i_things * sizeof(int16_t), __func__);
 226     for (i_things = 0, t = world.things; t;
 227          whitelist[i_things] = t->id, t = t->next, i_things++);
 228     whitelist[i_things] = -1;
 229     return whitelist;
 230 }
 231
 232
 233
 234 static uint8_t thing_in_whitelist(uint8_t id, int16_t * whitelist)
 235 {
 236     uint16_t i;
 237     for (i = 0; -1 < whitelist[i]; i++)
 238     {
 239         if ((int16_t) id == whitelist[i])
 240         {
 241             return 1;
 242         }
 243     }
 244     return 0;
 245 }
 246
 247
 248
 249 static void turn_over()
 250 {
 251     struct Thing * player = get_player();
 252     struct Thing * thing = player;
 253     int16_t * whitelist = build_whitelist();
 254     while (0 < player->lifepoints)
 255     {
 256         if (!thing)
 257         {
 258             world.turn++;
 259             thing = world.things;
 260             free(whitelist);
 261             whitelist = build_whitelist();/* The whitelist excludes things    */
 262         }                                 /* that appear only during the turn.*/
 263         if (thing_in_whitelist(thing->id, whitelist))
 264         {
 265             if (0 < thing->lifepoints)
 266             {
 267                 if (0 == thing->command)
 268                 {
 269                     if (thing == player)
 270                     {
 271                         break;
 272                     }
 273                     ai(thing);
 274                 }
 275                 thing->progress++;
 276                 struct ThingAction * ta = get_thing_action(thing->command);
 277                 if (thing->progress == ta->effort)
 278                 {
 279                     ta->func(thing);
 280                     thing->command = 0;
 281                     thing->progress = 0;
 282                 }
 283             }
 284             try_thing_proliferation(thing);
 285         }
 286         thing = thing->next;
 287     }
 288     free(whitelist);
 289 }
 290
 291
 292
 293 static uint8_t meta_commands(char * msg)
 294 {
 295     if (!strcmp("QUIT", msg))
 296     {
 297         free(msg);
 298         return 2;
 299     }
 300     if (!strcmp("PING", msg))
 301     {
 302         free(msg);
 303         send_to_outfile("PONG\n");
 304         return 1;
 305     }
 306     if (!strcmp("STACK", msg))
 307     {
 308         free(msg);
 309         send_to_outfile("THINGS_BELOW_PLAYER START\n");
 310         struct Thing * player = get_player();
 311         struct Thing * t;
 312         for (t = world.things; t; t = t->next)
 313         {
 314             if (   t->pos.y == player->pos.y && t->pos.x == player->pos.x
 315                 && t != player)
 316             {
 317                 struct ThingType * tt = get_thing_type(t->type);
 318                 send_to_outfile(tt->name);
 319                 send_to_outfile("\n");
 320             }
 321         }
 322         send_to_outfile("THINGS_BELOW_PLAYER END\n");
 323         return 1;
 324     }
 325     return 0;
 326 }
 327
 328
 329
 330 extern void send_to_outfile(char * answer)
 331 {
 332     try_fwrite(answer, strlen(answer), 1, world.file_out, __func__);
 333     fflush(world.file_out);
 334 }
 335
 336
 337
 338 extern void record(char * msg, uint8_t force)
 339 {
 340     static FILE * file_tmp = NULL;
 341     static time_t save_wait = 0;
 342     static char * path_tmp;
 343     if (!file_tmp)
 344     {
 345         path_tmp = build_temp_path(s[S_PATH_RECORD]);
 346         file_tmp = try_fopen(path_tmp, "w", __func__);
 347         if (!access(s[S_PATH_RECORD], F_OK))
 348         {
 349             FILE * file_read = try_fopen(s[S_PATH_RECORD], "r", __func__);
 350             uint32_t linemax = textfile_width(file_read);
 351             char * line = try_malloc(linemax + 1, __func__);
 352             while (try_fgets(line, linemax + 1, file_read, __func__))
 353             {
 354                 try_fwrite(line, strlen(line), 1, file_tmp, __func__);
 355             }
 356             free(line);
 357             try_fclose(file_read, __func__);
 358         }
 359     }
 360     if (msg)
 361     {
 362         try_fwrite(msg, strlen(msg), 1, file_tmp, __func__);
 363         try_fputc('\n', file_tmp, __func__);
 364     }
 365     if (force || time(NULL) > save_wait + 15)
 366     {
 367         save_wait = time(NULL);
 368         save_world();
 369         atomic_write_finish(file_tmp, s[S_PATH_RECORD], path_tmp);
 370         file_tmp = NULL;
 371     }
 372 }
 373
 374
 375
 376 extern void obey_msg(char * msg, uint8_t do_record, uint8_t do_verbose)
 377 {
 378     if (world.is_verbose && do_verbose)
 379     {
 380         exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 381     }
 382     set_err_line_options("Trouble with message: ", msg, 0);
 383     char * msg_copy = strdup(msg);
 384     char * tok0 = token_from_line(msg_copy);
 385     if (tok0)
 386     {
 387
 388         if (parse_command(tok0))
 389         {
 390             if (world.exists)
 391             {
 392                 world.do_update = 1;
 393             }
 394             if (do_record)
 395             {
 396                 record(msg, 0);
 397             }
 398             char * tokplus = token_from_line(NULL);
 399             err_line(!(!tokplus), "Too many arguments, ignoring overflow.");
 400             free(msg_copy);
 401             return;
 402         }
 403     }
 404     err_line(1, "Unknown command/argument or bad number of tokens.");
 405     free(msg_copy);
 406 }
 407
 408
 409
 410 extern uint8_t io_loop()
 411 {
 412     while (1)
 413     {
 414         char * msg = io_round();
 415         server_test();
 416         if (!msg)
 417         {
 418             continue;
 419         }
 420         if (world.is_verbose)
 421         {
 422             exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 423         }
 424         uint8_t test = meta_commands(msg);
 425         if (test)
 426         {
 427             if (2 == test)
 428             {
 429                 return 1;
 430             }
 431             continue;
 432         }
 433         if (world.replay)
 434         {
 435             free(msg);
 436             return 0;
 437         }
 438         obey_msg(msg, 1, 0);
 439         free(msg);
 440     }
 441 }