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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 */
  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 #include "world.h" /* world */
  33
  34
  35
  36 /* If "string" and "comparand" match in string, set "c_to_set" to value."  */
  37 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
  38                                              char * c_to_set, char value);
  39
  40 /* Return 1 on world.exists, else 0 and err_line() appropriate error message. */
  41 static uint8_t player_commands_allowed();
  42
  43 /* Parse player command "tok0" with no argument to player action. */
  44 static uint8_t parse_player_command_0arg(char * tok0);
  45
  46 /* Parse player command "tok0" with one argument "tok1" to player action. */
  47 static uint8_t parse_player_command_1arg(char * tok0, char * tok1);
  48
  49 /* Parse/apply command "tok0" (read further tokens as necessary). */
  50 static uint8_t parse_command(char * tok0);
  51
  52 /* Compares first line of server out file to world.server_test, aborts if they
  53  * don't match, but not before unsetting the flags deleting files in the server
  54  * directory, for in that case those must be assumed to belong to another server
  55  * process.
  56  */
  57 static void server_test();
  58
  59 /* Run the game world and its inhabitants (and their actions) until the player
  60  * avatar is free to receive new commands (or is dead).
  61  */
  62 static void turn_over();
  63
  64
  65
  66 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
  67                                              char * c_to_set, char value)
  68 {
  69     if (!strcmp(string, comparand))
  70     {
  71         * c_to_set = value;
  72         return 1;
  73     }
  74     return 0;
  75 }
  76
  77
  78
  79 static uint8_t player_commands_allowed()
  80 {
  81     if (!world.exists)
  82     {
  83         return !err_line(1, "No world exists in which to run player commands.");
  84     }
  85     return 1;
  86 }
  87
  88
  89
  90 static uint8_t parse_player_command_0arg(char * tok0)
  91 {
  92     struct Thing * player = get_player();
  93     if (   !strcmp(tok0, s[S_CMD_WAIT]) || !strcmp(tok0, s[S_CMD_PICKUP])
  94         || !strcmp(tok0, s[S_CMD_AI]))
  95     {
  96         if (player_commands_allowed())
  97         {
  98             if (!strcmp(tok0, s[S_CMD_AI]))
  99             {
 100                 ai(player);
 101             }
 102             else
 103             {
 104                 player->command = get_thing_action_id_by_name(tok0);
 105                 player->arg = 0;
 106             }
 107             turn_over();
 108         }
 109         return 1;
 110     }
 111     return 0;
 112 }
 113
 114
 115
 116 static uint8_t parse_player_command_1arg(char * tok0, char * tok1)
 117 {
 118     struct Thing * player = get_player();
 119     if (   (   parse_val(tok0, tok1, s[S_CMD_DROP], '8', (char *) &player->arg)
 120             || parse_val(tok0, tok1, s[S_CMD_USE], '8', (char *) &player->arg))
 121         && player_commands_allowed())
 122     {
 123         player->command = get_thing_action_id_by_name(tok0);
 124         turn_over();
 125     }
 126     else if (!strcmp(tok0, s[S_CMD_MOVE]) && player_commands_allowed())
 127     {
 128         char dir = '\0';
 129         if (!(   set_char_by_string_comparison(tok1, "east",       &dir, 'd')
 130               || set_char_by_string_comparison(tok1, "south-east", &dir, 'c')
 131               || set_char_by_string_comparison(tok1, "south-west", &dir, 'x')
 132               || set_char_by_string_comparison(tok1, "west",       &dir, 's')
 133               || set_char_by_string_comparison(tok1, "north-west", &dir, 'w')
 134               || set_char_by_string_comparison(tok1, "north-east", &dir, 'e')))
 135         {
 136             return 0;
 137         }
 138         player->arg = dir;
 139         player->command = get_thing_action_id_by_name(tok0);
 140         turn_over();
 141     }
 142     else
 143     {
 144         return 0;
 145     }
 146     return 1;
 147 }
 148
 149
 150
 151 static uint8_t parse_command(char * tok0)
 152 {
 153     if (parse_player_command_0arg(tok0))
 154     {
 155         return 1;
 156     }
 157     else
 158     {
 159         char * tok1 = token_from_line(NULL);
 160         if (tok1 && (   parse_player_command_1arg(tok0, tok1)
 161                      || parse_god_command_1arg(tok0, tok1)))
 162         {
 163             return 1;
 164         }
 165         else
 166         {
 167             char * tok2 = token_from_line(NULL);
 168             if (tok2 && parse_god_command_2arg(tok0, tok1, tok2))
 169             {
 170                 return 1;
 171             }
 172             else
 173             {
 174                 char * tok3 = token_from_line(NULL);
 175                 if (tok2 && parse_god_command_3arg(tok0, tok1, tok2, tok3))
 176                 {
 177                     return 1;
 178                 }
 179             }
 180         }
 181     }
 182     return 0;
 183 }
 184
 185
 186
 187 static void server_test()
 188 {
 189     char test[10 + 1 + 10 + 1 + 1];
 190     FILE * file = try_fopen(s[S_PATH_OUT], "r", __func__);
 191     try_fgets(test, 10 + 10 + 1 + 1, file, __func__);
 192     try_fclose(file, __func__);
 193     if (strcmp(test, world.server_test))
 194     {
 195         unset_cleanup_flag(CLEANUP_WORLDSTATE);
 196         unset_cleanup_flag(CLEANUP_OUT);
 197         unset_cleanup_flag(CLEANUP_IN);
 198         char * msg = "Server test string in server output file does not match. "
 199                      "This indicates that the current server process has been "
 200                      "superseded by another one.";
 201         exit_err(1, msg);
 202     }
 203 }
 204
 205
 206
 207 static void turn_over()
 208 {
 209     struct Thing * player = get_player();
 210     struct Thing * thing = player;
 211     uint16_t start_turn = world.turn;
 212     while (    0 < player->lifepoints
 213            || (0 == player->lifepoints && start_turn == world.turn))
 214     {
 215         if (!thing)
 216         {
 217             world.turn++;
 218             thing = world.things;
 219         }
 220         if (0 < thing->lifepoints)
 221         {
 222             if (0 == thing->command)
 223             {
 224                 if (thing == player)
 225                 {
 226                     break;
 227                 }
 228                 ai(thing);
 229             }
 230             thing->progress++;
 231             struct ThingAction * ta = get_thing_action(thing->command);
 232             if (thing->progress == ta->effort)
 233             {
 234                 ta->func(thing);
 235                 thing->command = 0;
 236                 thing->progress = 0;
 237             }
 238         }
 239         thing = thing->next;
 240     }
 241 }
 242
 243
 244
 245 extern void record(char * msg, uint8_t force)
 246 {
 247     static FILE * file_tmp = NULL;
 248     static time_t save_wait = 0;
 249     static char * path_tmp;
 250     if (!file_tmp)
 251     {
 252         path_tmp = build_temp_path(s[S_PATH_RECORD]);
 253         file_tmp = try_fopen(path_tmp, "w", __func__);
 254         if (!access(s[S_PATH_RECORD], F_OK))
 255         {
 256             FILE * file_read = try_fopen(s[S_PATH_RECORD], "r", __func__);
 257             uint32_t linemax = textfile_width(file_read);
 258             char * line = try_malloc(linemax + 1, __func__);
 259             while (try_fgets(line, linemax + 1, file_read, __func__))
 260             {
 261                 try_fwrite(line, strlen(line), 1, file_tmp, __func__);
 262             }
 263             free(line);
 264             try_fclose(file_read, __func__);
 265         }
 266     }
 267     if (msg)
 268     {
 269         try_fwrite(msg, strlen(msg), 1, file_tmp, __func__);
 270         try_fputc('\n', file_tmp, __func__);
 271     }
 272     if (force || time(NULL) > save_wait + 15)
 273     {
 274         save_wait = time(NULL);
 275         save_world();
 276         atomic_write_finish(file_tmp, s[S_PATH_RECORD], path_tmp);
 277         file_tmp = NULL;
 278     }
 279 }
 280
 281
 282
 283 extern void obey_msg(char * msg, uint8_t do_record, uint8_t do_verbose)
 284 {
 285     if (world.is_verbose && do_verbose)
 286     {
 287         exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 288     }
 289     set_err_line_options("Trouble with message: ", msg, 0);
 290     char * msg_copy = strdup(msg);
 291     char * tok0 = token_from_line(msg_copy);
 292     if (tok0)
 293     {
 294
 295         if (parse_command(tok0))
 296         {
 297             if (world.exists)
 298             {
 299                 world.do_update = 1;
 300             }
 301             if (do_record)
 302             {
 303                 record(msg, 0);
 304             }
 305             char * tokplus = token_from_line(NULL);
 306             err_line(!(!tokplus), "Too many arguments, ignoring overflow.");
 307             free(msg_copy);
 308             return;
 309         }
 310     }
 311     err_line(1, "Unknown command/argument or bad number of tokens.");
 312     free(msg_copy);
 313 }
 314
 315
 316
 317 extern uint8_t io_loop()
 318 {
 319     while (1)
 320     {
 321         char * msg = io_round();
 322         server_test();
 323         if (!msg)
 324         {
 325             continue;
 326         }
 327         if (world.is_verbose)
 328         {
 329             exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 330         }
 331         if (!strcmp("QUIT", msg))
 332         {
 333             free(msg);
 334             return 1;
 335         }
 336         if (!strcmp("PING", msg))
 337         {
 338             free(msg);
 339             char * pong = "PONG\n";
 340             try_fwrite(pong, strlen(pong), 1, world.file_out, __func__);
 341             fflush(world.file_out);
 342             continue;
 343         }
 344         if (world.replay)
 345         {
 346             free(msg);
 347             return 0;
 348         }
 349         obey_msg(msg, 1, 0);
 350         free(msg);
 351     }
 352 }