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() */
9 #include <stdlib.h> /* free() */
10 #include <string.h> /* strlen(), memcpy() */
11 #include <sys/types.h> /* time_t */
12 #include <time.h> /* time() */
13 #include "../common/readwrite.h" /* try_fopen(), try_fclose_unlink_rename(),
14 * try_fwrite(), try_fputc(), try_fgetc()
16 #include "../common/try_malloc.h" /* try_malloc() */
17 #include "cleanup.h" /* set_cleanup_flag() */
18 #include "map_objects.h" /* structs MapObj, MapObjDef, get_map_obj_def() */
19 #include "world.h" /* global world */
23 /* Cut out and return first \0-terminated string from world.queue and
24 * appropriately reduce world.queue_size. Return NULL if queue is empty.
25 * Superfluous \0 bytes after the string are also cut out. Should the queue
26 * start with \0 bytes, those are cut out, but NULL is returned instead of "".
28 static char * get_message_from_queue();
30 /* Read input file for input into world.queue. new queue input. Wait a few
31 * seconds until giving up. Translate '\n' chars in input file into '\0' chars.
33 static void read_file_into_queue();
35 /* Write world state as visible to clients to its file. Write single dot line to
36 * server output file to satisfy client ping mechanisms.
38 static void update_worldstate_file();
40 /* Write "value" to new \n-delimited line of "file". */
41 static void write_value_as_line(uint32_t value, FILE * file);
43 /* Write to "file" player's inventory, one item name per line. End in "%\n". */
44 static void write_inventory(struct MapObj * player, FILE * file);
46 /* Write to "file" game map, with map objects super-imposed. Write one row per
47 * \n-delimited line. Super-impose animated objects over inanimate objects.
49 static void write_map(FILE * file);
53 static char * get_message_from_queue()
55 char * f_name = "get_message_from_queue()";
56 char * message = NULL;
59 size_t cutout_len = strlen(world.queue);
63 message = try_malloc(cutout_len, f_name);
64 memcpy(message, world.queue, cutout_len);
67 cutout_len != world.queue_size && '\0' == world.queue[cutout_len];
69 world.queue_size = world.queue_size - cutout_len;
70 if (0 == world.queue_size)
72 free(world.queue); /* NULL so read_file_into_queue() may free() */
73 world.queue = NULL; /* this every time, even when it's */
74 } /* un-allocated first. */
77 char * new_queue = try_malloc(world.queue_size, f_name);
78 memcpy(new_queue, &(world.queue[cutout_len]), world.queue_size);
80 world.queue = new_queue;
88 static void read_file_into_queue()
90 char * f_name = "read_file_into_queue()";
91 uint8_t wait_seconds = 5;
94 while (EOF == (test = try_fgetc(world.file_in, f_name)))
96 if (time(0) > now + wait_seconds)
103 char c = (char) test;
108 char * new_queue = try_malloc(world.queue_size + 1, f_name);
109 memcpy(new_queue, world.queue, world.queue_size);
110 char * new_pos = new_queue + world.queue_size;
114 world.queue = new_queue;
116 while (EOF != (test = try_fgetc(world.file_in, f_name)));
121 static void update_worldstate_file()
123 char * f_name = "update_worldstate_file()";
124 char path_tmp[strlen(world.path_worldstate) + strlen(world.tmp_suffix) + 1];
125 sprintf(path_tmp, "%s%s", world.path_worldstate, world.tmp_suffix);
126 FILE * file = try_fopen(path_tmp, "w", f_name);
127 struct MapObj * player = get_player();
128 write_value_as_line(world.turn, file);
129 write_value_as_line(player->lifepoints, file);
130 write_inventory(player, file);
131 write_value_as_line(player->pos.y, file);
132 write_value_as_line(player->pos.x, file);
133 write_value_as_line(world.map.size.y, file);
134 write_value_as_line(world.map.size.x, file);
138 try_fwrite(world.log, strlen(world.log), 1, file, f_name);
140 try_fclose_unlink_rename(file, path_tmp, world.path_worldstate, f_name);
141 set_cleanup_flag(CLEANUP_WORLDSTATE);
143 try_fwrite(dot, strlen(dot), 1, world.file_out, f_name);
144 fflush(world.file_out);
149 static void write_value_as_line(uint32_t value, FILE * file)
151 char * f_name = "write_value_as_line()";
152 char write_buf[12]; /* Holds 10 digits of uint32_t maximum + \n + \0. */
153 sprintf(write_buf, "%u\n", value);
154 try_fwrite(write_buf, strlen(write_buf), 1, file, f_name);
159 static void write_inventory(struct MapObj * player, FILE * file)
161 char * f_name = "write_inventory()";
162 struct MapObj * owned = player->owns;
165 char * empty = "(none)\n";
166 try_fwrite(empty, strlen(empty), 1, file, f_name);
171 for (q = 0; NULL != owned; q++)
173 struct MapObjDef * mod = get_map_object_def(owned->type);
174 try_fwrite(mod->name, strlen(mod->name), 1, file, f_name);
175 try_fputc('\n', file, f_name);
179 try_fputc('%', file, f_name);
180 try_fputc('\n', file, f_name);
185 static void write_map(FILE * file)
187 char * f_name = "write_map()";
188 uint32_t map_size = world.map.size.y * world.map.size.x;
189 char visible_map[map_size];
190 memcpy(visible_map, world.map.cells, map_size);
192 struct MapObjDef * d;
195 for (i = 0; i < 2; i++)
197 for (o = world.map_objs; o != 0; o = o->next)
199 if (( (0 == i && 0 == o->lifepoints)
200 || (1 == i && 0 < o->lifepoints)))
202 d = get_map_object_def(o->type);
204 visible_map[(o->pos.y * world.map.size.x) + o->pos.x] = c;
209 for (y = 0; y < world.map.size.y; y++)
211 for (x = 0; x < world.map.size.x; x++)
213 try_fputc(visible_map[(y * world.map.size.x) + x], file, f_name);
215 try_fputc('\n', file, f_name);
221 extern char * io_round()
223 char * f_name = "io_round()";
224 if (0 < world.queue_size)
226 return get_message_from_queue();
228 if (world.turn != world.last_update_turn)
230 update_worldstate_file();
231 world.last_update_turn = world.turn;
233 read_file_into_queue();
234 if (world.queue_size && '\0' != world.queue[world.queue_size - 1])
236 char * new_queue = try_malloc(world.queue_size + 1, f_name);
237 memcpy(new_queue, world.queue, world.queue_size);
238 new_queue[world.queue_size] = '\0';
241 world.queue = new_queue;
243 return get_message_from_queue();