4 #include <errno.h> /* global errno */
5 #include <limits.h> /* PIPE_BUF */
6 #include <stddef.h> /* size_t, NULL */
7 #include <stdint.h> /* uint8_t, uint32_t */
8 #include <stdio.h> /* defines EOF, FILE, sprintf(), ungetc() */
9 #include <stdlib.h> /* free(), atoi() */
10 #include <string.h> /* strlen(), memcpy() */
11 #include <sys/types.h> /* time_t */
12 #include <time.h> /* time() */
13 #include "../common/err_try_fgets.h" /* err_try_fgets(), err_line(),
14 * reset_err_try_fgets_counter()
16 #include "../common/readwrite.h" /* try_fopen(), try_fclose_unlink_rename(),
17 * try_fwrite(), try_fputc(), try_fgetc(),
20 #include "../common/rexit.h" /* exit_trouble() */
21 #include "../common/try_malloc.h" /* try_malloc() */
22 #include "cleanup.h" /* set_cleanup_flag(), enum cleanup_flag */
23 #include "map_objects.h" /* structs MapObj, MapObjDef, get_map_obj_def() */
24 #include "world.h" /* global world */
28 /* Cut out and return first \0-terminated string from world.queue and
29 * appropriately reduce world.queue_size. Return NULL if queue is empty.
30 * Superfluous \0 bytes after the string are also cut out. Should the queue
31 * start with \0 bytes, those are cut out, but NULL is returned instead of "".
33 static char * get_message_from_queue();
35 /* Read input file for input into world.queue. new queue input. Wait a few
36 * seconds until giving up. Translate '\n' chars in input file into '\0' chars.
38 static void read_file_into_queue();
40 /* Write world state as visible to clients to its file. Write single dot line to
41 * server output file to satisfy client ping mechanisms.
43 static void update_worldstate_file();
45 /* Write "value" to new \n-delimited line of "file". */
46 static void write_value_as_line(uint32_t value, FILE * file);
48 /* Write to "file" player's inventory, one item name per line. End in "%\n". */
49 static void write_inventory(struct MapObj * player, FILE * file);
51 /* Write to "file" game map, with map objects super-imposed. Write one row per
52 * \n-delimited line. Super-impose animated objects over inanimate objects.
54 static void write_map(FILE * file);
58 static char * get_message_from_queue()
60 char * f_name = "get_message_from_queue()";
61 char * message = NULL;
64 size_t cutout_len = strlen(world.queue);
68 message = try_malloc(cutout_len, f_name);
69 memcpy(message, world.queue, cutout_len);
72 cutout_len != world.queue_size && '\0' == world.queue[cutout_len];
74 world.queue_size = world.queue_size - cutout_len;
75 if (0 == world.queue_size)
77 free(world.queue); /* NULL so read_file_into_queue() may free() */
78 world.queue = NULL; /* this every time, even when it's */
79 } /* un-allocated first. */
82 char * new_queue = try_malloc(world.queue_size, f_name);
83 memcpy(new_queue, &(world.queue[cutout_len]), world.queue_size);
85 world.queue = new_queue;
93 static void read_file_into_queue()
95 char * f_name = "read_file_into_queue()";
96 uint8_t wait_seconds = 5;
99 while (EOF == (test = try_fgetc(world.file_in, f_name)))
101 if (time(0) > now + wait_seconds)
108 char c = (char) test;
113 char * new_queue = try_malloc(world.queue_size + 1, f_name);
114 memcpy(new_queue, world.queue, world.queue_size);
115 char * new_pos = new_queue + world.queue_size;
119 world.queue = new_queue;
121 while (EOF != (test = try_fgetc(world.file_in, f_name)));
126 static void update_worldstate_file()
128 char * f_name = "update_worldstate_file()";
129 char path_tmp[strlen(world.path_worldstate) + strlen(world.tmp_suffix) + 1];
130 sprintf(path_tmp, "%s%s", world.path_worldstate, world.tmp_suffix);
131 FILE * file = try_fopen(path_tmp, "w", f_name);
132 struct MapObj * player = get_player();
133 write_value_as_line(world.turn, file);
134 write_value_as_line(player->lifepoints, file);
135 write_inventory(player, file);
136 write_value_as_line(player->pos.y, file);
137 write_value_as_line(player->pos.x, file);
138 write_value_as_line(world.map.size.y, file);
139 write_value_as_line(world.map.size.x, file);
143 try_fwrite(world.log, strlen(world.log), 1, file, f_name);
145 try_fclose_unlink_rename(file, path_tmp, world.path_worldstate, f_name);
146 set_cleanup_flag(CLEANUP_WORLDSTATE);
148 try_fwrite(dot, strlen(dot), 1, world.file_out, f_name);
149 fflush(world.file_out);
154 static void write_value_as_line(uint32_t value, FILE * file)
156 char * f_name = "write_value_as_line()";
157 char write_buf[12]; /* Holds 10 digits of uint32_t maximum + \n + \0. */
158 sprintf(write_buf, "%u\n", value);
159 try_fwrite(write_buf, strlen(write_buf), 1, file, f_name);
164 static void write_inventory(struct MapObj * player, FILE * file)
166 char * f_name = "write_inventory()";
167 struct MapObj * owned = player->owns;
170 char * empty = "(none)\n";
171 try_fwrite(empty, strlen(empty), 1, file, f_name);
176 for (q = 0; NULL != owned; q++)
178 struct MapObjDef * mod = get_map_object_def(owned->type);
179 try_fwrite(mod->name, strlen(mod->name), 1, file, f_name);
180 try_fputc('\n', file, f_name);
184 try_fputc('%', file, f_name);
185 try_fputc('\n', file, f_name);
190 static void write_map(FILE * file)
192 char * f_name = "write_map()";
193 uint32_t map_size = world.map.size.y * world.map.size.x;
194 char visible_map[map_size];
195 memcpy(visible_map, world.map.cells, map_size);
197 struct MapObjDef * d;
200 for (i = 0; i < 2; i++)
202 for (o = world.map_objs; o != 0; o = o->next)
204 if (( (0 == i && 0 == o->lifepoints)
205 || (1 == i && 0 < o->lifepoints)))
207 d = get_map_object_def(o->type);
209 visible_map[(o->pos.y * world.map.size.x) + o->pos.x] = c;
214 for (y = 0; y < world.map.size.y; y++)
216 for (x = 0; x < world.map.size.x; x++)
218 try_fputc(visible_map[(y * world.map.size.x) + x], file, f_name);
220 try_fputc('\n', file, f_name);
226 extern void read_config_file(char * path, enum cleanup_flag cleanup,
227 size_t size, struct EntrySkeleton ** entry_start,
228 void (* read) (char *, uint32_t, char *,
229 struct EntrySkeleton *, FILE *))
231 char * f_name = "init_map_object_defs()";
232 char * context_prefix = "Failed reading config file: ";
233 char context[strlen(context_prefix) + strlen(path) + 1];
234 sprintf(context, "%s%s", context_prefix, path);
235 char * err_uniq = "Declaration of ID already used.";
236 FILE * file = try_fopen(path, "r", f_name);
237 uint32_t linemax = textfile_width(file);
238 char line[linemax + 1];
239 reset_err_try_fgets_counter();
240 struct EntrySkeleton ** entry_ptr_ptr = entry_start;
243 int test_for_end = try_fgetc(file, f_name);
244 if (EOF == test_for_end || '\n' == test_for_end)
248 exit_trouble(EOF == ungetc(test_for_end, file), f_name, "ungetc()");
249 err_try_fgets(line, linemax, file, context, "nfi8");
250 struct EntrySkeleton * entry = try_malloc(size, f_name);
251 entry->id = atoi(line);
252 struct EntrySkeleton * entry_test = * entry_start;
253 for (; NULL != entry_test; entry_test = entry_test->next)
255 err_line(entry->id == entry_test->id, line, context, err_uniq);
257 read(line, linemax, context, entry, file);
259 * entry_ptr_ptr = entry;
260 entry_ptr_ptr = &entry->next;
261 err_try_fgets(line, linemax, file, context, "d");
263 try_fclose(file, f_name);
264 set_cleanup_flag(cleanup);
269 extern char * io_round()
271 char * f_name = "io_round()";
272 if (0 < world.queue_size)
274 return get_message_from_queue();
276 if (world.turn != world.last_update_turn)
278 update_worldstate_file();
279 world.last_update_turn = world.turn;
281 read_file_into_queue();
282 if (world.queue_size && '\0' != world.queue[world.queue_size - 1])
284 char * new_queue = try_malloc(world.queue_size + 1, f_name);
285 memcpy(new_queue, world.queue, world.queue_size);
286 new_queue[world.queue_size] = '\0';
289 world.queue = new_queue;
291 return get_message_from_queue();