1 /* src/server/things.c */
4 #include <stddef.h> /* NULL */
5 #include <stdint.h> /* uint8_t, uint16_t, UINT16_MAX */
6 #include <stdlib.h> /* free() */
7 #include <string.h> /* memset(), strlen() */
8 #include "../common/rexit.h" /* exit_err() */
9 #include "../common/try_malloc.h" /* try_malloc() */
10 #include "../common/yx_uint8.h" /* yx_uint8 struct */
11 #include "map.h" /* is_passable() */
12 #include "rrand.h" /* rrand() */
13 #include "world.h" /* global world */
14 #include "yx_uint8.h" /* yx_uint8_cmp() */
18 /* Return pointer to thing of "id" in chain starting at "ptr". */
19 static struct Thing * get_thing(struct Thing * ptr, uint8_t id);
21 /* Add thing of "type" to map on passable position. Don't put actor on actor. */
22 static void add_thing(uint8_t type);
26 static struct Thing * get_thing(struct Thing * ptr, uint8_t id)
30 if (NULL == ptr || id == ptr->id)
34 struct Thing * owned_thing = get_thing(ptr->owns, id);
35 if (NULL != owned_thing)
45 static void add_thing(uint8_t type)
47 char * f_name = "add_thing()";
48 struct ThingType * tt = get_thing_type(type);
49 struct Thing * t = try_malloc(sizeof(struct Thing), f_name);
50 memset(t, 0, sizeof(struct Thing));
51 t->id = world.thing_count++;
53 t->lifepoints = tt->lifepoints;
54 char * err = "Space to put thing on too hard to find. Map too small?";
59 for (pos.y = pos.x = 0; 0 == is_passable(pos); i++)
61 exit_err(UINT16_MAX == i, err);
62 pos.y = rrand() % world.map.length;
63 pos.x = rrand() % world.map.length;
67 for (t_ptr = world.things; t_ptr != NULL; t_ptr = t_ptr->next)
69 if (yx_uint8_cmp(&pos, &t_ptr->pos) && 0 != t_ptr->lifepoints)
81 struct Thing ** t_ptr_ptr = &world.things;
82 for (; NULL != * t_ptr_ptr; t_ptr_ptr = &(*t_ptr_ptr)->next);
88 extern void free_thing_types(struct ThingType * tt_start)
94 free_thing_types(tt_start->next);
101 extern void add_things(uint8_t type, uint8_t n)
104 for (i = 0; i < n; i++)
112 extern void free_things(struct Thing * t_start)
118 free_things(t_start->owns);
119 free_things(t_start->next);
120 free(t_start->fov_map);
122 if (t_start == world.things) /* So add_things()' NULL-delimited thing */
123 { /* iteration loop does not iterate over */
124 world.things = NULL; /* freed memory when called the first time */
125 } /* after world re-seeding. */
130 extern void own_thing(struct Thing ** target, struct Thing ** source,
134 if (id == (*source)->id)
141 struct Thing * penult = * source;
144 if (id == penult->next->id)
148 penult = penult->next;
151 penult->next = t->next;
153 struct Thing ** t_ptr_ptr = target;
154 for (; NULL != * t_ptr_ptr; t_ptr_ptr = &(*t_ptr_ptr)->next);
161 extern struct Thing * get_player()
163 return get_thing(world.things, 0);
168 extern struct ThingType * get_thing_type(uint8_t id)
170 struct ThingType * tt = world.thing_types;
171 for (; NULL != tt && id != tt->id; tt = tt->next);
172 char * err_intro = "Requested thing type of unused ID ";
173 char err[strlen(err_intro) + 3 + 1 + 1];
174 sprintf(err, "%s%d.", err_intro, id);
175 exit_err(NULL == tt, err);
181 extern void set_thing_position(struct Thing * t, struct yx_uint8 pos)
184 struct Thing * owned = t->owns;
185 for (; owned != NULL; set_thing_position(owned, pos), owned = owned->next);