3 #define _BSD_SOURCE /* usleep() */
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() */
14 #include <unistd.h> /* usleep() */
15 #include "../common/readwrite.h" /* try_fopen(), try_fclose_unlink_rename(),
16 * try_fwrite(), try_fputc(), try_fgetc()
18 #include "../common/try_malloc.h" /* try_malloc() */
19 #include "cleanup.h" /* set_cleanup_flag() */
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, with map objects super-imposed. Write one row per
49 * \n-delimited line. Super-impose animated objects over inanimate objects.
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;
96 while (EOF == (test = try_fgetc(world.file_in, f_name)))
99 if (time(0) > now + wait_seconds)
106 char c = (char) test;
111 char * new_queue = try_malloc(world.queue_size + 1, f_name);
112 memcpy(new_queue, world.queue, world.queue_size);
113 char * new_pos = new_queue + world.queue_size;
117 world.queue = new_queue;
119 while (EOF != (test = try_fgetc(world.file_in, f_name)));
124 static void update_worldstate_file()
126 char * f_name = "update_worldstate_file()";
127 char path_tmp[strlen(world.path_worldstate) + strlen(world.tmp_suffix) + 1];
128 sprintf(path_tmp, "%s%s", world.path_worldstate, world.tmp_suffix);
129 FILE * file = try_fopen(path_tmp, "w", f_name);
130 struct MapObj * player = get_player();
131 write_value_as_line(world.turn, file);
132 write_value_as_line(player->lifepoints, file);
133 write_inventory(player, file);
134 write_value_as_line(player->pos.y, file);
135 write_value_as_line(player->pos.x, file);
136 write_value_as_line(world.map.size.y, file);
137 write_value_as_line(world.map.size.x, file);
141 try_fwrite(world.log, strlen(world.log), 1, file, f_name);
143 try_fclose_unlink_rename(file, path_tmp, world.path_worldstate, f_name);
144 set_cleanup_flag(CLEANUP_WORLDSTATE);
146 try_fwrite(dot, strlen(dot), 1, world.file_out, f_name);
147 fflush(world.file_out);
152 static void write_value_as_line(uint32_t value, FILE * file)
154 char * f_name = "write_value_as_line()";
155 char write_buf[12]; /* Holds 10 digits of uint32_t maximum + \n + \0. */
156 sprintf(write_buf, "%u\n", value);
157 try_fwrite(write_buf, strlen(write_buf), 1, file, f_name);
162 static void write_inventory(struct MapObj * player, FILE * file)
164 char * f_name = "write_inventory()";
165 struct MapObj * owned = player->owns;
168 char * empty = "(none)\n";
169 try_fwrite(empty, strlen(empty), 1, file, f_name);
174 for (q = 0; NULL != owned; q++)
176 struct MapObjDef * mod = get_map_object_def(owned->type);
177 try_fwrite(mod->name, strlen(mod->name), 1, file, f_name);
178 try_fputc('\n', file, f_name);
182 try_fputc('%', file, f_name);
183 try_fputc('\n', file, f_name);
188 static void write_map(FILE * file)
190 char * f_name = "write_map()";
191 uint32_t map_size = world.map.size.y * world.map.size.x;
192 char visible_map[map_size];
193 memcpy(visible_map, world.map.cells, map_size);
195 struct MapObjDef * d;
198 for (i = 0; i < 2; i++)
200 for (o = world.map_objs; o != 0; o = o->next)
202 if (( (0 == i && 0 == o->lifepoints)
203 || (1 == i && 0 < o->lifepoints)))
205 d = get_map_object_def(o->type);
207 visible_map[(o->pos.y * world.map.size.x) + o->pos.x] = c;
212 for (y = 0; y < world.map.size.y; y++)
214 for (x = 0; x < world.map.size.x; x++)
216 try_fputc(visible_map[(y * world.map.size.x) + x], file, f_name);
218 try_fputc('\n', file, f_name);
224 extern char * io_round()
226 char * f_name = "io_round()";
227 if (0 < world.queue_size)
229 return get_message_from_queue();
231 if (world.turn != world.last_update_turn)
233 update_worldstate_file();
234 world.last_update_turn = world.turn;
236 read_file_into_queue();
237 if (world.queue_size && '\0' != world.queue[world.queue_size - 1])
239 char * new_queue = try_malloc(world.queue_size + 1, f_name);
240 memcpy(new_queue, world.queue, world.queue_size);
241 new_queue[world.queue_size] = '\0';
244 world.queue = new_queue;
246 return get_message_from_queue();