3 #define _POSIX_C_SOURCE 199309L
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, uint32_t */
9 #include <stdio.h> /* defines EOF, FILE, sprintf() */
10 #include <stdlib.h> /* free() */
11 #include <string.h> /* strlen(), memcpy() */
12 #include <sys/types.h> /* time_t */
13 #include <time.h> /* time(), nanosleep() */
14 #include "../common/readwrite.h" /* try_fopen(), try_fclose_unlink_rename(),
15 * try_fwrite(), try_fputc(), try_fgetc()
17 #include "../common/try_malloc.h" /* try_malloc() */
18 #include "cleanup.h" /* set_cleanup_flag() */
19 #include "field_of_view.h" /* build_visible_map() */
20 #include "map_objects.h" /* structs MapObj, MapObjDef, get_map_obj_def() */
21 #include "world.h" /* global world */
25 /* Cut out and return first \0-terminated string from world.queue and
26 * appropriately reduce world.queue_size. Return NULL if queue is empty.
27 * Superfluous \0 bytes after the string are also cut out. Should the queue
28 * start with \0 bytes, those are cut out, but NULL is returned instead of "".
30 static char * get_message_from_queue();
32 /* Poll input file for world.queue input. Wait a few seconds until giving up;
33 * poll only every 0.03 seconds.. Translate '\n' chars in input file into '\0'.
35 static void read_file_into_queue();
37 /* Write world state as visible to clients to its file. Write single dot line to
38 * server output file to satisfy client ping mechanisms.
40 static void update_worldstate_file();
42 /* Write "value" to new \n-delimited line of "file". */
43 static void write_value_as_line(uint32_t value, FILE * file);
45 /* Write to "file" player's inventory, one item name per line. End in "%\n". */
46 static void write_inventory(struct MapObj * player, FILE * file);
48 /* Write to "file" game map as visible to the player, build_visible_map()-drawn.
49 * Write one row per \n-delimited line.
51 static void write_map(FILE * file);
55 static char * get_message_from_queue()
57 char * f_name = "get_message_from_queue()";
58 char * message = NULL;
61 size_t cutout_len = strlen(world.queue);
65 message = try_malloc(cutout_len, f_name);
66 memcpy(message, world.queue, cutout_len);
69 cutout_len != world.queue_size && '\0' == world.queue[cutout_len];
71 world.queue_size = world.queue_size - cutout_len;
72 if (0 == world.queue_size)
74 free(world.queue); /* NULL so read_file_into_queue() may free() */
75 world.queue = NULL; /* this every time, even when it's */
76 } /* un-allocated first. */
79 char * new_queue = try_malloc(world.queue_size, f_name);
80 memcpy(new_queue, &(world.queue[cutout_len]), world.queue_size);
82 world.queue = new_queue;
90 static void read_file_into_queue()
92 char * f_name = "read_file_into_queue()";
93 uint8_t wait_seconds = 5;
97 dur.tv_nsec = 33333333;
99 while (EOF == (test = try_fgetc(world.file_in, f_name)))
101 nanosleep(&dur, NULL);
102 if (time(0) > now + wait_seconds)
109 char c = (char) test;
114 char * new_queue = try_malloc(world.queue_size + 1, f_name);
115 memcpy(new_queue, world.queue, world.queue_size);
116 char * new_pos = new_queue + world.queue_size;
120 world.queue = new_queue;
122 while (EOF != (test = try_fgetc(world.file_in, f_name)));
127 static void update_worldstate_file()
129 char * f_name = "update_worldstate_file()";
130 char path_tmp[strlen(world.path_worldstate) + strlen(world.tmp_suffix) + 1];
131 sprintf(path_tmp, "%s%s", world.path_worldstate, world.tmp_suffix);
132 FILE * file = try_fopen(path_tmp, "w", f_name);
133 struct MapObj * player = get_player();
134 write_value_as_line(world.turn, file);
135 write_value_as_line(player->lifepoints, file);
136 write_inventory(player, file);
137 write_value_as_line(player->pos.y, file);
138 write_value_as_line(player->pos.x, file);
139 write_value_as_line(world.map.size.y, file);
140 write_value_as_line(world.map.size.x, file);
144 try_fwrite(world.log, strlen(world.log), 1, file, f_name);
146 try_fclose_unlink_rename(file, path_tmp, world.path_worldstate, f_name);
147 set_cleanup_flag(CLEANUP_WORLDSTATE);
149 try_fwrite(dot, strlen(dot), 1, world.file_out, f_name);
150 fflush(world.file_out);
155 static void write_value_as_line(uint32_t value, FILE * file)
157 char * f_name = "write_value_as_line()";
158 char write_buf[12]; /* Holds 10 digits of uint32_t maximum + \n + \0. */
159 sprintf(write_buf, "%u\n", value);
160 try_fwrite(write_buf, strlen(write_buf), 1, file, f_name);
165 static void write_inventory(struct MapObj * player, FILE * file)
167 char * f_name = "write_inventory()";
168 struct MapObj * owned = player->owns;
171 char * empty = "(none)\n";
172 try_fwrite(empty, strlen(empty), 1, file, f_name);
177 for (q = 0; NULL != owned; q++)
179 struct MapObjDef * mod = get_map_object_def(owned->type);
180 try_fwrite(mod->name, strlen(mod->name), 1, file, f_name);
181 try_fputc('\n', file, f_name);
185 try_fputc('%', file, f_name);
186 try_fputc('\n', file, f_name);
191 static void write_map(FILE * file)
193 char * f_name = "write_map()";
194 char * visible_map = build_visible_map();
196 for (y = 0; y < world.map.size.y; y++)
198 for (x = 0; x < world.map.size.x; x++)
200 try_fputc(visible_map[(y * world.map.size.x) + x], file, f_name);
202 try_fputc('\n', file, f_name);
209 extern char * io_round()
211 char * f_name = "io_round()";
212 if (0 < world.queue_size)
214 return get_message_from_queue();
216 if (world.turn != world.last_update_turn)
218 update_worldstate_file();
219 world.last_update_turn = world.turn;
221 read_file_into_queue();
222 if (world.queue_size && '\0' != world.queue[world.queue_size - 1])
224 char * new_queue = try_malloc(world.queue_size + 1, f_name);
225 memcpy(new_queue, world.queue, world.queue_size);
226 new_queue[world.queue_size] = '\0';
229 world.queue = new_queue;
231 return get_message_from_queue();