plomlompom.com Git - plomrogue/blob - src/server/run.c

   1 /* src/server/run.c */
   2
   3 #define _POSIX_C_SOURCE 200809L
   4 #include "run.h"
   5 #include <stddef.h> /* NULL */
   6 #include <stdint.h> /* uint8_t, uint16_t, uint32_t */
   7 #include <stdio.h> /* FILE, printf(), fflush() */
   8 #include <stdlib.h> /* free() */
   9 #include <string.h> /* strlen(), strcmp(), strncmp(), strdup() */
  10 #include <unistd.h> /* access() */
  11 #include "../common/parse_file.h" /* set_err_line_options(), token_from_line(),
  12                                    * err_line(), err_line_inc(), parse_val()
  13                                    */
  14 #include "../common/readwrite.h" /* try_fopen(), try_fcose(), try_fwrite(),
  15                                   * try_fgets(), textfile_width(), try_fputc()
  16                                   */
  17 #include "../common/rexit.h" /* exit_trouble(), exit_err() */
  18 #include "../common/try_malloc.h" /* try_malloc() */
  19 #include "ai.h" /* ai() */
  20 #include "cleanup.h" /* unset_cleanup_flag() */
  21 #include "god_commands.h" /* parse_god_command_1arg(),parse_god_command_2arg()*/
  22 #include "hardcoded_strings.h" /* s */
  23 #include "io.h" /* io_round(), save_world() */
  24 #include "things.h" /* Thing, get_thing_action_id_by_name(), get_player() */
  25 #include "world.h" /* world */
  26
  27
  28
  29 /* If "string" and "comparand" match in string, set "c_to_set" to value."  */
  30 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
  31                                              char * c_to_set, char value);
  32
  33 /* Return 1 on world.exists, else 0 and err_line() appropriate error message. */
  34 static uint8_t player_commands_allowed();
  35
  36 /* Parse player command "tok0" with no argument to player action. */
  37 static uint8_t parse_player_command_0arg(char * tok0);
  38
  39 /* Parse player command "tok0" with one argument "tok1" to player action. */
  40 static uint8_t parse_player_command_1arg(char * tok0, char * tok1);
  41
  42 /* Parse/apply command "tok0" (read further tokens as necessary). */
  43 static uint8_t parse_command(char * tok0);
  44
  45 /* Compares first line of server out file to world.server_test, aborts if they
  46  * don't match, but not before unsetting the flags deleting files in the server
  47  * directory, for in that case those must be assumed to belong to another server
  48  * process.
  49  */
  50 static void server_test();
  51
  52 /* Run the game world and its inhabitants (and their actions) until the player
  53  * avatar is free to receive new commands (or is dead).
  54  */
  55 static void turn_over();
  56
  57
  58
  59
  60 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
  61                                              char * c_to_set, char value)
  62 {
  63     if (!strcmp(string, comparand))
  64     {
  65         * c_to_set = value;
  66         return 1;
  67     }
  68     return 0;
  69 }
  70
  71
  72
  73 static uint8_t player_commands_allowed()
  74 {
  75     if (!world.exists)
  76     {
  77         err_line(1, "No world exists in which to run player commands.");
  78         return 0;
  79     }
  80     return 1;
  81 }
  82
  83
  84
  85 static uint8_t parse_player_command_0arg(char * tok0)
  86 {
  87     struct Thing * player = get_player();
  88     if (!strcmp(tok0, s[S_CMD_WAIT]) || !strcmp(tok0, s[S_CMD_PICKUP]))
  89     {
  90         if (player_commands_allowed())
  91         {
  92             player->command = get_thing_action_id_by_name(tok0);
  93             player->arg = 0;
  94             turn_over();
  95         }
  96         return 1;
  97     }
  98     return 0;
  99 }
 100
 101
 102
 103 static uint8_t parse_player_command_1arg(char * tok0, char * tok1)
 104 {
 105     struct Thing * player = get_player();
 106     if (   (   parse_val(tok0, tok1, s[S_CMD_DROP], '8', (char *) &player->arg)
 107             || parse_val(tok0, tok1, s[S_CMD_USE], '8', (char *) &player->arg))
 108         && player_commands_allowed())
 109     {
 110         player->command = get_thing_action_id_by_name(tok0);
 111         turn_over();
 112     }
 113     else if (!strcmp(tok0, s[S_CMD_MOVE]) && player_commands_allowed())
 114     {
 115         char dir = '\0';
 116         if (!(   set_char_by_string_comparison(tok1, "east",       &dir, 'd')
 117               || set_char_by_string_comparison(tok1, "south-east", &dir, 'c')
 118               || set_char_by_string_comparison(tok1, "south-west", &dir, 'x')
 119               || set_char_by_string_comparison(tok1, "west",       &dir, 's')
 120               || set_char_by_string_comparison(tok1, "north-west", &dir, 'w')
 121               || set_char_by_string_comparison(tok1, "north-east", &dir, 'e')))
 122         {
 123             return 0;
 124         }
 125         player->arg = dir;
 126         player->command = get_thing_action_id_by_name(tok0);
 127         turn_over();
 128     }
 129     else
 130     {
 131         return 0;
 132     }
 133     return 1;
 134 }
 135
 136
 137
 138 static uint8_t parse_command(char * tok0)
 139 {
 140     if (parse_player_command_0arg(tok0))
 141     {
 142         return 1;
 143     }
 144     else
 145     {
 146         char * tok1 = token_from_line(NULL);
 147         if (tok1 && (   parse_player_command_1arg(tok0, tok1)
 148                      || parse_god_command_1arg(tok0, tok1)))
 149         {
 150             return 1;
 151         }
 152         else
 153         {
 154             char * tok2 = token_from_line(NULL);
 155             if (tok2 && parse_god_command_2arg(tok0, tok1, tok2))
 156             {
 157                 return 1;
 158             }
 159         }
 160     }
 161     return 0;
 162 }
 163
 164
 165
 166 static void server_test()
 167 {
 168     char test[10 + 1 + 10 + 1 + 1];
 169     FILE * file = try_fopen(s[S_PATH_OUT], "r", __func__);
 170     try_fgets(test, 10 + 10 + 1 + 1, file, __func__);
 171     try_fclose(file, __func__);
 172     if (strcmp(test, world.server_test))
 173     {
 174         unset_cleanup_flag(CLEANUP_WORLDSTATE);
 175         unset_cleanup_flag(CLEANUP_OUT);
 176         unset_cleanup_flag(CLEANUP_IN);
 177         char * msg = "Server test string in server output file does not match. "
 178                      "This indicates that the current server process has been "
 179                      "superseded by another one.";
 180         exit_err(1, msg);
 181     }
 182 }
 183
 184
 185
 186 static void turn_over()
 187 {
 188     struct Thing * player = get_player();
 189     struct Thing * thing = player;
 190     uint16_t start_turn = world.turn;
 191     while (    0 < player->lifepoints
 192            || (0 == player->lifepoints && start_turn == world.turn))
 193     {
 194         if (NULL == thing)
 195         {
 196             world.turn++;
 197             thing = world.things;
 198         }
 199         if (0 < thing->lifepoints)
 200         {
 201             if (0 == thing->command)
 202             {
 203                 if (thing == player)
 204                 {
 205                     break;
 206                 }
 207                 ai(thing);
 208             }
 209             thing->progress++;
 210             struct ThingAction * ta = get_thing_action(thing->command);
 211             if (thing->progress == ta->effort)
 212             {
 213                 ta->func(thing);
 214                 thing->command = 0;
 215                 thing->progress = 0;
 216             }
 217         }
 218         thing = thing->next;
 219     }
 220 }
 221
 222
 223
 224 static void record_msg(char * msg)
 225 {
 226     char * path_tmp;
 227     FILE * file_tmp = atomic_write_start(s[S_PATH_RECORD], &path_tmp);
 228     if (!access(s[S_PATH_RECORD], F_OK))
 229     {
 230         FILE * file_read = try_fopen(s[S_PATH_RECORD], "r", __func__);
 231         uint32_t linemax = textfile_width(file_read);
 232         char * line = try_malloc(linemax + 1, __func__);
 233         while (try_fgets(line, linemax + 1, file_read, __func__))
 234         {
 235             try_fwrite(line, strlen(line), 1, file_tmp, __func__);
 236         }
 237         free(line);
 238         try_fclose(file_read, __func__);
 239     }
 240     try_fwrite(msg, strlen(msg), 1, file_tmp, __func__);
 241     try_fputc('\n', file_tmp, __func__);
 242     atomic_write_finish(file_tmp, s[S_PATH_RECORD], path_tmp);
 243 }
 244
 245
 246
 247 extern void obey_msg(char * msg, uint8_t do_record, uint8_t do_verbose)
 248 {
 249     if (world.is_verbose && do_verbose)
 250     {
 251         exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 252     }
 253     set_err_line_options("Trouble with message: ", msg, 0);
 254     char * msg_copy = strdup(msg);
 255     char * tok0 = token_from_line(msg_copy);
 256     if (NULL != tok0)
 257     {
 258
 259         if (parse_command(tok0))
 260         {
 261             if (world.exists)
 262             {
 263                 world.do_update = 1;
 264             }
 265             if (do_record)
 266             {
 267                 save_world();
 268                 record_msg(msg);
 269             }
 270             char * tokplus = token_from_line(NULL);
 271             err_line(NULL != tokplus, "Too many arguments, ignoring overflow.");
 272             free(msg_copy);
 273             return;
 274         }
 275     }
 276     err_line(1, "Unknown command/argument or bad number of tokens.");
 277     free(msg_copy);
 278 }
 279
 280
 281
 282 extern uint8_t io_loop()
 283 {
 284     while (1)
 285     {
 286         server_test();
 287         char * msg = io_round();
 288         if (NULL == msg)
 289         {
 290             continue;
 291         }
 292         if (world.is_verbose)
 293         {
 294             exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 295         }
 296         if (!strcmp("QUIT", msg))
 297         {
 298             free(msg);
 299             return 1;
 300         }
 301         if (!strcmp("PING", msg))
 302         {
 303             free(msg);
 304             char * pong = "PONG\n";
 305             try_fwrite(pong, strlen(pong), 1, world.file_out, __func__);
 306             fflush(world.file_out);
 307             continue;
 308         }
 309         if (world.replay)
 310         {
 311             free(msg);
 312             return 0;
 313         }
 314         obey_msg(msg, 1, 0);
 315         free(msg);
 316     }
 317 }