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() */
  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, comment on
  37  * invalidity of non-zero "tok1" (but do not abort in that case).
  38  */
  39 static uint8_t parse_player_command_0arg(char * tok0, char * tok1);
  40
  41 /* Parse player command "tok0" with one argument "tok1" to player action. */
  42 static uint8_t parse_player_command_1arg(char * tok0, char * tok1);
  43
  44 /* Parse/apply command "tok0" with argument "tok1" and test the line for further
  45  * tokens, commenting on their invalidity (but don't abort on finding them).
  46  */
  47 static uint8_t parse_command_1arg(char * tok0, char * tok1);
  48
  49
  50 /* Compares first line of server out file to world.server_test, aborts if they
  51  * don't match, but not before unsetting the flags deleting files in the server
  52  * directory, for in that case those must be assumed to belong to another server
  53  * process.
  54  */
  55 static void server_test();
  56
  57 /* Run the game world and its inhabitants (and their actions) until the player
  58  * avatar is free to receive new commands (or is dead).
  59  */
  60 static void turn_over();
  61
  62
  63
  64
  65 static uint8_t set_char_by_string_comparison(char * string, char * comparand,
  66                                              char * c_to_set, char value)
  67 {
  68     if (!strcmp(string, comparand))
  69     {
  70         * c_to_set = value;
  71         return 1;
  72     }
  73     return 0;
  74 }
  75
  76
  77
  78 static uint8_t player_commands_allowed()
  79 {
  80     if (!world.exists)
  81     {
  82         err_line(1, "No world exists in which to run player commands.");
  83         return 0;
  84     }
  85     return 1;
  86 }
  87
  88
  89
  90 static uint8_t parse_player_command_0arg(char * tok0, char * tok1)
  91 {
  92     struct Thing * player = get_player();
  93     if (!strcmp(tok0, s[S_CMD_WAIT]) || !strcmp(tok0, s[S_CMD_PICKUP]))
  94     {
  95         if (player_commands_allowed())
  96         {
  97             player->command = get_thing_action_id_by_name(tok0);
  98             player->arg = 0;
  99             turn_over();
 100             err_line (NULL != tok1, "No arguments expected, ignoring them.");
 101         }
 102         return 1;
 103     }
 104     return 0;
 105 }
 106
 107
 108
 109 static uint8_t parse_player_command_1arg(char * tok0, char * tok1)
 110 {
 111     struct Thing * player = get_player();
 112     if (   (   parse_val(tok0, tok1, s[S_CMD_DROP], '8', (char *) &player->arg)
 113             || parse_val(tok0, tok1, s[S_CMD_USE], '8', (char *) &player->arg))
 114         && player_commands_allowed())
 115     {
 116         player->command = get_thing_action_id_by_name(tok0);
 117         turn_over();
 118     }
 119     else if (!strcmp(tok0, s[S_CMD_MOVE]) && player_commands_allowed())
 120     {
 121         char dir = '\0';
 122         if (!(   set_char_by_string_comparison(tok1, "east",       &dir, 'd')
 123               || set_char_by_string_comparison(tok1, "south-east", &dir, 'c')
 124               || set_char_by_string_comparison(tok1, "south-west", &dir, 'x')
 125               || set_char_by_string_comparison(tok1, "west",       &dir, 's')
 126               || set_char_by_string_comparison(tok1, "north-west", &dir, 'w')
 127               || set_char_by_string_comparison(tok1, "north-east", &dir, 'e')))
 128         {
 129             return 0;
 130         }
 131         player->arg = dir;
 132         player->command = get_thing_action_id_by_name(tok0);
 133         turn_over();
 134     }
 135     else
 136     {
 137         return 0;
 138     }
 139     return 1;
 140 }
 141
 142
 143
 144 static uint8_t parse_command_1arg(char * tok0, char * tok1)
 145 {
 146     char * tok2 = token_from_line(NULL);
 147     if (   parse_player_command_1arg(tok0, tok1)
 148         || parse_god_command_1arg(tok0, tok1));
 149     else
 150     {
 151         return 0;
 152     }
 153     char * err = "But one argument expected, ignoring further arguments.";
 154     err_line (NULL != tok2, err);
 155     return 1;
 156 }
 157
 158
 159
 160 static void server_test()
 161 {
 162     char test[10 + 1 + 10 + 1 + 1];
 163     FILE * file = try_fopen(s[S_PATH_OUT], "r", __func__);
 164     try_fgets(test, 10 + 10 + 1 + 1, file, __func__);
 165     try_fclose(file, __func__);
 166     if (strcmp(test, world.server_test))
 167     {
 168         unset_cleanup_flag(CLEANUP_WORLDSTATE);
 169         unset_cleanup_flag(CLEANUP_OUT);
 170         unset_cleanup_flag(CLEANUP_IN);
 171         char * msg = "Server test string in server output file does not match. "
 172                      "This indicates that the current server process has been "
 173                      "superseded by another one.";
 174         exit_err(1, msg);
 175     }
 176 }
 177
 178
 179
 180 static void turn_over()
 181 {
 182     struct Thing * player = get_player();
 183     struct Thing * thing = player;
 184     uint16_t start_turn = world.turn;
 185     while (    0 < player->lifepoints
 186            || (0 == player->lifepoints && start_turn == world.turn))
 187     {
 188         if (NULL == thing)
 189         {
 190             world.turn++;
 191             thing = world.things;
 192         }
 193         if (0 < thing->lifepoints)
 194         {
 195             if (0 == thing->command)
 196             {
 197                 if (thing == player)
 198                 {
 199                     break;
 200                 }
 201                 ai(thing);
 202             }
 203             thing->progress++;
 204
 205             struct ThingAction * ta = get_thing_action(thing->command);
 206             if (thing->progress == ta->effort)
 207             {
 208                 ta->func(thing);
 209                 thing->command = 0;
 210                 thing->progress = 0;
 211             }
 212         }
 213         thing = thing->next;
 214     }
 215 }
 216
 217
 218
 219 static void record_msg(char * msg)
 220 {
 221     char * path_tmp;
 222     FILE * file_tmp = atomic_write_start(s[S_PATH_RECORD], &path_tmp);
 223     if (!access(s[S_PATH_RECORD], F_OK))
 224     {
 225         FILE * file_read = try_fopen(s[S_PATH_RECORD], "r", __func__);
 226         uint32_t linemax = textfile_width(file_read);
 227         char * line = try_malloc(linemax + 1, __func__);
 228         while (try_fgets(line, linemax + 1, file_read, __func__))
 229         {
 230             try_fwrite(line, strlen(line), 1, file_tmp, __func__);
 231         }
 232         free(line);
 233         try_fclose(file_read, __func__);
 234     }
 235     try_fwrite(msg, strlen(msg), 1, file_tmp, __func__);
 236     try_fputc('\n', file_tmp, __func__);
 237     atomic_write_finish(file_tmp, s[S_PATH_RECORD], path_tmp);
 238 }
 239
 240
 241
 242 extern void obey_msg(char * msg, uint8_t do_record, uint8_t do_verbose)
 243 {
 244     if (world.is_verbose && do_verbose)
 245     {
 246         exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 247     }
 248     set_err_line_options("Trouble with message: ", msg, 0);
 249     char * msg_copy = strdup(msg);
 250     char * tok0 = token_from_line(msg_copy);
 251     if (NULL != tok0)
 252     {
 253         char * tok1 = token_from_line(NULL);
 254         if (    parse_player_command_0arg(tok0, tok1)
 255             || (tok1 && parse_command_1arg(tok0, tok1)))
 256         {
 257             if (world.exists)
 258             {
 259                 world.do_update = 1;
 260             }
 261             if (do_record)
 262             {
 263                 save_world();
 264                 record_msg(msg);
 265             }
 266             free(msg_copy);
 267             return;
 268         }
 269     }
 270     err_line(1, "Unknown command/argument or bad number of tokens.");
 271     free(msg_copy);
 272 }
 273
 274
 275
 276 extern uint8_t io_loop()
 277 {
 278     while (1)
 279     {
 280         server_test();
 281         char * msg = io_round();
 282         if (NULL == msg)
 283         {
 284             continue;
 285         }
 286         if (world.is_verbose)
 287         {
 288             exit_trouble(-1 == printf("Input: %s\n", msg), __func__, "printf");
 289         }
 290         if (!strcmp("QUIT", msg))
 291         {
 292             free(msg);
 293             return 1;
 294         }
 295         if (!strcmp("PING", msg))
 296         {
 297             free(msg);
 298             char * pong = "PONG\n";
 299             try_fwrite(pong, strlen(pong), 1, world.file_out, __func__);
 300             fflush(world.file_out);
 301             continue;
 302         }
 303         if (world.replay)
 304         {
 305             free(msg);
 306             return 0;
 307         }
 308         obey_msg(msg, 1, 0);
 309         free(msg);
 310     }
 311 }