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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
   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, get_thing_action_id_by_name(), get_player(),
  32                       * 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
  75
  76 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
  77                                              char * c_to_set, char value)
  78 {
  79     if (!strcmp(string, comparand))
  80     {
  81         * c_to_set = value;
  82         return 1;
  83     }
  84     return 0;
  85 }
  86
  87
  88
  89 static uint8_t player_commands_allowed()
  90 {
  91     if (!world.exists)
  92     {
  93         return !err_line(1, "No world exists in which to run player commands.");
  94     }
  95     return 1;
  96 }
  97
  98
  99
 100 static uint8_t parse_player_command_0arg(char * tok0)
 101 {
 102     struct Thing * player = get_player();
 103     if (   !strcmp(tok0, s[S_CMD_WAIT]) || !strcmp(tok0, s[S_CMD_PICKUP])
 104         || !strcmp(tok0, s[S_CMD_AI]))
 105     {
 106         if (player_commands_allowed())
 107         {
 108             if (!strcmp(tok0, s[S_CMD_AI]))
 109             {
 110                 ai(player);
 111             }
 112             else
 113             {
 114                 player->command = get_thing_action_id_by_name(tok0);
 115                 player->arg = 0;
 116             }
 117             turn_over();
 118         }
 119         return 1;
 120     }
 121     return 0;
 122 }
 123
 124
 125
 126 static uint8_t parse_player_command_1arg(char * tok0, char * tok1)
 127 {
 128     struct Thing * player = get_player();
 129     if (   (   parse_val(tok0, tok1, s[S_CMD_DROP], '8', (char *) &player->arg)
 130             || parse_val(tok0, tok1, s[S_CMD_USE], '8', (char *) &player->arg))
 131         && player_commands_allowed())
 132     {
 133         player->command = get_thing_action_id_by_name(tok0);
 134         turn_over();
 135     }
 136     else if (!strcmp(tok0, s[S_CMD_MOVE]) && player_commands_allowed())
 137     {
 138         char dir = '\0';
 139         if (!(   set_char_by_string_comparison(tok1, "east",       &dir, 'd')
 140               || set_char_by_string_comparison(tok1, "south-east", &dir, 'c')
 141               || set_char_by_string_comparison(tok1, "south-west", &dir, 'x')
 142               || set_char_by_string_comparison(tok1, "west",       &dir, 's')
 143               || set_char_by_string_comparison(tok1, "north-west", &dir, 'w')
 144               || set_char_by_string_comparison(tok1, "north-east", &dir, 'e')))
 145         {
 146             return 0;
 147         }
 148         player->arg = dir;
 149         player->command = get_thing_action_id_by_name(tok0);
 150         turn_over();
 151     }
 152     else
 153     {
 154         return 0;
 155     }
 156     return 1;
 157 }
 158
 159
 160
 161 static uint8_t parse_command(char * tok0)
 162 {
 163     if (parse_player_command_0arg(tok0))
 164     {
 165         return 1;
 166     }
 167     else
 168     {
 169         char * tok1 = token_from_line(NULL);
 170         if (tok1 && (   parse_player_command_1arg(tok0, tok1)
 171                      || parse_god_command_1arg(tok0, tok1)))
 172         {
 173             return 1;
 174         }
 175         else
 176         {
 177             char * tok2 = token_from_line(NULL);
 178             if (tok2 && parse_god_command_2arg(tok0, tok1, tok2))
 179             {
 180                 return 1;
 181             }
 182             else
 183             {
 184                 char * tok3 = token_from_line(NULL);
 185                 if (tok2 && parse_god_command_3arg(tok0, tok1, tok2, tok3))
 186                 {
 187                     return 1;
 188                 }
 189             }
 190         }
 191     }
 192     return 0;
 193 }
 194
 195
 196
 197 static void server_test()
 198 {
 199     char test[10 + 1 + 10 + 1 + 1];
 200     FILE * file = try_fopen(s[S_PATH_OUT], "r", __func__);
 201     try_fgets(test, 10 + 10 + 1 + 1, file, __func__);
 202     try_fclose(file, __func__);
 203     if (strcmp(test, world.server_test))
 204     {
 205         unset_cleanup_flag(CLEANUP_WORLDSTATE);
 206         unset_cleanup_flag(CLEANUP_OUT);
 207         unset_cleanup_flag(CLEANUP_IN);
 208         char * msg = "Server test string in server output file does not match. "
 209                      "This indicates that the current server process has been "
 210                      "superseded by another one.";
 211         exit_err(1, msg);
 212     }
 213 }
 214
 215
 216
 217 static int16_t * build_whitelist()
 218 {
 219     uint16_t i_things = NULL != world.things;
 220     struct Thing * t = world.things;
 221     for (; t; t = t->next, i_things++);
 222     int16_t * whitelist = try_malloc(i_things * sizeof(int16_t), __func__);
 223     for (i_things = 0, t = world.things; t;
 224          whitelist[i_things] = t->id, t = t->next, i_things++)
 225     whitelist[i_things] = -1;
 226     return whitelist;
 227 }
 228
 229
 230
 231 static uint8_t thing_in_whitelist(uint8_t id, int16_t * whitelist)
 232 {
 233     int16_t i;
 234     for (i = 0; -1 < whitelist[i]; i++)
 235     {
 236         if ((int16_t) id == whitelist[i])
 237         {
 238             return 1;
 239         }
 240     }
 241     return 0;
 242 }
 243
 244
 245
 246 static void turn_over()
 247 {
 248     struct Thing * player = get_player();
 249     struct Thing * thing = player;
 250     uint16_t start_turn = world.turn;
 251     int16_t * whitelist = build_whitelist();
 252     while (    0 < player->lifepoints
 253            || (0 == player->lifepoints && start_turn == world.turn))
 254     {             /* TODO: check meaning and refactorability of 2nd condition */
 255         if (!thing)
 256         {
 257             world.turn++;
 258             thing = world.things;
 259             free(whitelist);
 260             whitelist = build_whitelist();
 261         }
 262         if (thing_in_whitelist(thing->id, whitelist))
 263         {
 264             if (0 < thing->lifepoints)
 265             {
 266                 if (0 == thing->command)
 267                 {
 268                     if (thing == player)
 269                     {
 270                         break;
 271                     }
 272                     ai(thing);
 273                 }
 274                 thing->progress++;
 275                 struct ThingAction * ta = get_thing_action(thing->command);
 276                 if (thing->progress == ta->effort)
 277                 {
 278                     ta->func(thing);
 279                     thing->command = 0;
 280                     thing->progress = 0;
 281                 }
 282             }
 283             try_thing_proliferation(thing);
 284         }
 285         thing = thing->next;
 286     }
 287     free(whitelist);
 288 }
 289
 290
 291
 292 extern void record(char * msg, uint8_t force)
 293 {
 294     static FILE * file_tmp = NULL;
 295     static time_t save_wait = 0;
 296     static char * path_tmp;
 297     if (!file_tmp)
 298     {
 299         path_tmp = build_temp_path(s[S_PATH_RECORD]);
 300         file_tmp = try_fopen(path_tmp, "w", __func__);
 301         if (!access(s[S_PATH_RECORD], F_OK))
 302         {
 303             FILE * file_read = try_fopen(s[S_PATH_RECORD], "r", __func__);
 304             uint32_t linemax = textfile_width(file_read);
 305             char * line = try_malloc(linemax + 1, __func__);
 306             while (try_fgets(line, linemax + 1, file_read, __func__))
 307             {
 308                 try_fwrite(line, strlen(line), 1, file_tmp, __func__);
 309             }
 310             free(line);
 311             try_fclose(file_read, __func__);
 312         }
 313     }
 314     if (msg)
 315     {
 316         try_fwrite(msg, strlen(msg), 1, file_tmp, __func__);
 317         try_fputc('\n', file_tmp, __func__);
 318     }
 319     if (force || time(NULL) > save_wait + 15)
 320     {
 321         save_wait = time(NULL);
 322         save_world();
 323         atomic_write_finish(file_tmp, s[S_PATH_RECORD], path_tmp);
 324         file_tmp = NULL;
 325     }
 326 }
 327
 328
 329
 330 extern void obey_msg(char * msg, uint8_t do_record, uint8_t do_verbose)
 331 {
 332     if (world.is_verbose && do_verbose)
 333     {
 334         exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 335     }
 336     set_err_line_options("Trouble with message: ", msg, 0);
 337     char * msg_copy = strdup(msg);
 338     char * tok0 = token_from_line(msg_copy);
 339     if (tok0)
 340     {
 341
 342         if (parse_command(tok0))
 343         {
 344             if (world.exists)
 345             {
 346                 world.do_update = 1;
 347             }
 348             if (do_record)
 349             {
 350                 record(msg, 0);
 351             }
 352             char * tokplus = token_from_line(NULL);
 353             err_line(!(!tokplus), "Too many arguments, ignoring overflow.");
 354             free(msg_copy);
 355             return;
 356         }
 357     }
 358     err_line(1, "Unknown command/argument or bad number of tokens.");
 359     free(msg_copy);
 360 }
 361
 362
 363
 364 extern uint8_t io_loop()
 365 {
 366     while (1)
 367     {
 368         char * msg = io_round();
 369         server_test();
 370         if (!msg)
 371         {
 372             continue;
 373         }
 374         if (world.is_verbose)
 375         {
 376             exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 377         }
 378         if (!strcmp("QUIT", msg))
 379         {
 380             free(msg);
 381             return 1;
 382         }
 383         if (!strcmp("PING", msg))
 384         {
 385             free(msg);
 386             char * pong = "PONG\n";
 387             try_fwrite(pong, strlen(pong), 1, world.file_out, __func__);
 388             fflush(world.file_out);
 389             continue;
 390         }
 391         if (world.replay)
 392         {
 393             free(msg);
 394             return 0;
 395         }
 396         obey_msg(msg, 1, 0);
 397         free(msg);
 398     }
 399 }