3 #define _POSIX_C_SOURCE 200112L /* snrpintf() */
5 #include <errno.h> /* global errno */
6 #include <limits.h> /* PIPE_BUF */
7 #include <stddef.h> /* size_t, NULL */
8 #include <stdint.h> /* uint8_t, uint16_t, uint32_t, UINT8_MAX */
9 #include <stdio.h> /* defines EOF, FILE, sprintf(), fprintf() */
10 #include <stdlib.h> /* free() */
11 #include <string.h> /* strlen(), snprintf(), memcpy(), memset(), strchr() */
12 #include <sys/types.h> /* time_t */
13 #include <time.h> /* time(), nanosleep() */
14 #include "../common/readwrite.h" /* atomic_write_start(), atomic_write_finish(),
15 * try_fwrite(), try_fputc(), try_fgetc()
17 #include "../common/rexit.h" /* exit_trouble() */
18 #include "../common/try_malloc.h" /* try_malloc() */
19 #include "cleanup.h" /* set_cleanup_flag() */
20 #include "hardcoded_strings.h" /* s */
21 #include "things.h" /* Thing, ThingType, ThingAction, get_thing_type(),
24 #include "world.h" /* global world */
28 /* Helpers to write lines of god commands to recreate thing "t". */
29 static void write_key_space(FILE * file, char * key);
30 static void write_value(FILE * file, uint32_t value);
31 static void write_string(FILE * file, char * string);
32 static void write_key_space_value(FILE * file, char * key, uint32_t value);
33 static void write_key_space_string(FILE * file, char * key, char * string);
35 /* Write to "file" \n-delimited line of "key" + space + "value" as string. */
36 static void write_thing(FILE * file, struct Thing * t);
38 /* Cut out and return first \0-terminated string from world.queue and
39 * appropriately reduce world.queue_size. Return NULL if queue is empty.
40 * Superfluous \0 bytes after the string are also cut out. Should the queue
41 * start with \0 bytes, those are cut out, but NULL is returned instead of "".
43 static char * get_message_from_queue();
45 /* Poll input file for world.queue input. Wait a few seconds until giving up;
46 * poll only every 0.03 seconds.. Translate '\n' chars in input file into '\0'.
48 static void read_file_into_queue();
50 /* Write world state as visible to clients to its file. Write single dot line to
51 * server output file to satisfy client ping mechanisms.
53 static void update_worldstate_file();
55 /* Write "value" to new \n-delimited line of "file". */
56 static void write_value_as_line(uint32_t value, FILE * file);
58 /* Write to "file" player's inventory, one item name per line. End in "%\n". */
59 static void write_inventory(struct Thing * player, FILE * file);
61 /* Return map cells sequence as visible to the "player", with invisible cells as
62 * whitespace. Super-impose over visible map cells things positioned there,
63 * with animate things overwriting inanimate things, and inanimate consumable
64 * things overwriting inanimate non-consumable things.
66 static char * build_visible_map(struct Thing * player);
68 /* Write to "file" game map as visible to "player" right now, as drawn by
69 * build_visible_map(), and thereafter game map as memorized by player in its
70 * .mem_map. Write one row per \n-delimited line.
72 static void write_map(struct Thing * player, FILE * file);
76 static void write_key_space(FILE * file, char * key)
78 try_fwrite(key, strlen(key), 1, file, __func__);
79 try_fputc(' ', file, __func__);
84 static void write_value(FILE * file, uint32_t value)
86 char * line = try_malloc(11, __func__);
87 exit_trouble(-1 == sprintf(line, "%u", value), __func__, s[S_FCN_SPRINTF]);
88 try_fwrite(line, strlen(line), 1, file, __func__);
94 static void write_string(FILE * file, char * string)
96 uint8_t contains_space = NULL != strchr(string, ' ');
99 try_fputc('\'', file, __func__);
101 try_fwrite(string, strlen(string), 1, file, __func__);
104 try_fputc('\'', file, __func__);
110 static void write_key_space_value(FILE * file, char * key, uint32_t value)
112 write_key_space(file, key);
113 write_value(file, value);
114 try_fputc('\n', file, __func__);
119 static void write_key_space_string(FILE * file, char * key, char * string)
121 write_key_space(file, key);
122 write_string(file, string);
123 try_fputc('\n', file, __func__);
128 static void write_thing(FILE * file, struct Thing * t)
131 for (o = t->owns; o; o = o->next)
133 write_thing(file, o);
135 write_key_space_value(file, s[S_CMD_T_ID], t->id);
136 write_key_space_value(file, s[S_CMD_T_TYPE], t->type);
137 write_key_space_value(file, s[S_CMD_T_POSY], t->pos.y);
138 write_key_space_value(file, s[S_CMD_T_POSX], t->pos.x);
139 write_key_space_value(file, s[S_CMD_T_COMMAND], t->command);
140 write_key_space_value(file, s[S_CMD_T_ARGUMENT], t->arg);
141 write_key_space_value(file, s[S_CMD_T_PROGRESS], t->progress);
142 write_key_space_value(file, s[S_CMD_T_HP], t->lifepoints);
143 for (o = t->owns; o; o = o->next)
145 write_key_space_value(file, s[S_CMD_T_CARRIES], o->id);
149 uint32_t map_size = world.map.length * world.map.length;/* snprintf() */
150 char * mem_map_copy = try_malloc(map_size + 1, __func__);/* reads one */
151 memcpy(mem_map_copy, t->mem_map, map_size); /* byte beyond map_size */
152 mem_map_copy[map_size] = '\0'; /* if string is not \0-terminated. */
154 char string[UINT8_MAX + 1 + 1];
155 for (y = 0; y < world.map.length; y++)
158 int test = snprintf(string, world.map.length + 1, "%s",
159 mem_map_copy + (y * world.map.length));
160 exit_trouble(test < 0, __func__, "snprintf()");
161 write_key_space(file, s[S_CMD_T_MEMMAP]);
162 write_value(file, y);
163 try_fputc(' ', file, __func__);
164 write_string(file, string);
165 try_fputc('\n', file, __func__);
169 try_fputc('\n', file, __func__);
174 static char * get_message_from_queue()
176 char * message = NULL;
177 if (world.queue_size)
179 size_t cutout_len = strlen(world.queue);
183 message = try_malloc(cutout_len, __func__);
184 memcpy(message, world.queue, cutout_len);
187 cutout_len != world.queue_size && '\0' == world.queue[cutout_len];
189 world.queue_size = world.queue_size - cutout_len;
190 if (0 == world.queue_size)
192 free(world.queue); /* NULL so read_file_into_queue() may free() */
193 world.queue = NULL; /* this every time, even when it's */
194 } /* un-allocated first. */
197 char * new_queue = try_malloc(world.queue_size, __func__);
198 memcpy(new_queue, &(world.queue[cutout_len]), world.queue_size);
200 world.queue = new_queue;
208 static void read_file_into_queue()
210 uint8_t wait_seconds = 5;
211 time_t now = time(0);
214 dur.tv_nsec = 33333333;
216 while (EOF == (test = try_fgetc(world.file_in, __func__)))
218 nanosleep(&dur, NULL);
219 if (time(0) > now + wait_seconds)
226 char c = (char) test;
231 char * new_queue = try_malloc(world.queue_size + 1, __func__);
232 memcpy(new_queue, world.queue, world.queue_size);
233 char * new_pos = new_queue + world.queue_size;
237 world.queue = new_queue;
239 while (EOF != (test = try_fgetc(world.file_in, __func__)));
244 static void update_worldstate_file()
247 FILE * file = atomic_write_start(s[S_PATH_WORLDSTATE], &path_tmp);
248 struct Thing * player = get_player();
249 write_value_as_line(world.turn, file);
250 write_value_as_line(player->lifepoints, file);
251 write_inventory(player, file);
252 write_value_as_line(player->pos.y, file);
253 write_value_as_line(player->pos.x, file);
254 write_value_as_line(world.map.length, file);
255 write_map(player, file);
258 try_fwrite(world.log, strlen(world.log), 1, file, __func__);
260 atomic_write_finish(file, s[S_PATH_WORLDSTATE], path_tmp);
261 set_cleanup_flag(CLEANUP_WORLDSTATE);
263 try_fwrite(dot, strlen(dot), 1, world.file_out, __func__);
264 fflush(world.file_out);
269 static void write_value_as_line(uint32_t value, FILE * file)
271 char write_buf[12]; /* Holds 10 digits of uint32_t maximum + \n + \0. */
272 exit_trouble(sprintf(write_buf,"%u\n",value) < 0,__func__,s[S_FCN_SPRINTF]);
273 try_fwrite(write_buf, strlen(write_buf), 1, file, __func__);
278 static void write_inventory(struct Thing * player, FILE * file)
280 struct Thing * owned = player->owns;
283 char * empty = "(none)\n";
284 try_fwrite(empty, strlen(empty), 1, file, __func__);
289 for (q = 0; NULL != owned; q++)
291 struct ThingType * tt = get_thing_type(owned->type);
292 try_fwrite(tt->name, strlen(tt->name), 1, file, __func__);
293 try_fputc('\n', file, __func__);
297 try_fputc('%', file, __func__);
298 try_fputc('\n', file, __func__);
303 static char * build_visible_map(struct Thing * player)
305 uint32_t map_size = world.map.length * world.map.length;
306 char * visible_map = try_malloc(map_size, __func__);
307 memset(visible_map, ' ', map_size);
308 if (player->fov_map) /* May fail if player thing was created / positioned */
309 { /* by god command after turning off FOV building. */
311 for (pos_i = 0; pos_i < map_size; pos_i++)
313 if (player->fov_map[pos_i] == 'v')
315 visible_map[pos_i] = world.map.cells[pos_i];
321 for (i = 0; i < 3; i++)
323 for (t = world.things; t != 0; t = t->next)
325 if ('v' == player->fov_map[t->pos.y*world.map.length+t->pos.x])
327 struct ThingType * tt = get_thing_type(t->type);
328 if ( (0 == i && !t->lifepoints && !tt->consumable)
329 || (1 == i && !t->lifepoints && tt->consumable)
330 || (2 == i && t->lifepoints))
333 visible_map[t->pos.y * world.map.length + t->pos.x] = c;
344 static void write_map(struct Thing * player, FILE * file)
346 char * visible_map = build_visible_map(player);
348 for (y = 0; y < world.map.length; y++)
350 for (x = 0; x < world.map.length; x++)
352 try_fputc(visible_map[y * world.map.length + x], file, __func__);
354 try_fputc('\n', file, __func__);
357 for (y = 0; y < world.map.length; y++)
359 for (x = 0; x < world.map.length; x++)
361 try_fputc(player->mem_map[y*world.map.length+x], file, __func__);
363 try_fputc('\n', file, __func__);
369 extern char * io_round()
371 if (0 < world.queue_size)
373 return get_message_from_queue();
377 update_worldstate_file();
380 read_file_into_queue();
381 if (world.queue_size && '\0' != world.queue[world.queue_size - 1])
383 char * new_queue = try_malloc(world.queue_size + 1, __func__);
384 memcpy(new_queue, world.queue, world.queue_size);
385 new_queue[world.queue_size] = '\0';
388 world.queue = new_queue;
390 return get_message_from_queue();
395 extern void save_world()
398 FILE * file = atomic_write_start(s[S_PATH_SAVE], &path_tmp);
399 write_key_space_value(file, s[S_CMD_MAPLENGTH], world.map.length);
400 write_key_space_value(file, s[S_CMD_PLAYTYPE], world.player_type);
401 try_fputc('\n', file, __func__);
402 struct ThingAction * ta;
403 for (ta = world.thing_actions; ta; ta = ta->next)
405 write_key_space_value(file, s[S_CMD_TA_ID], ta->id);
406 write_key_space_value(file, s[S_CMD_TA_EFFORT], ta->effort);
407 write_key_space_string(file, s[S_CMD_TA_NAME], ta->name);
408 try_fputc('\n', file, __func__);
410 struct ThingType * tt;
411 for (tt = world.thing_types; tt; tt = tt->next)
413 write_key_space_value(file, s[S_CMD_TT_ID], tt->id);
414 write_key_space_value(file, s[S_CMD_TT_STARTN], tt->start_n);
415 write_key_space_value(file, s[S_CMD_TT_HP], tt->lifepoints);
416 int test = fprintf(file, "%s %c\n", s[S_CMD_TT_SYMB], tt->char_on_map);
417 exit_trouble(test < 0, __func__, "fprintf");
418 write_key_space_string(file, s[S_CMD_TT_NAME], tt->name);
419 write_key_space_value(file, s[S_CMD_TT_CONSUM], tt->consumable);
420 try_fputc('\n', file, __func__);
422 for (tt = world.thing_types; tt; tt = tt->next)
424 write_key_space_value(file, s[S_CMD_TT_ID], tt->id);
425 write_key_space_value(file, s[S_CMD_TT_CORPS], tt->corpse_id);
427 try_fputc('\n', file, __func__);
428 write_key_space_value(file, s[S_CMD_SEED_MAP], world.seed_map);
429 write_key_space_value(file, s[S_CMD_SEED_RAND], world.seed);
430 write_key_space_value(file, s[S_CMD_TURN], world.turn);
431 try_fputc('\n', file, __func__);
433 for (t = world.things; t; t = t->next)
435 write_thing(file, t);
437 write_key_space_value(file, s[S_CMD_WORLD_ACTIVE], 1);
438 atomic_write_finish(file, s[S_PATH_SAVE], path_tmp);