1 /*
2 * SysDB - src/core/object.c
3 * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
28 #include "core/object.h"
30 #include <assert.h>
32 #include <stdlib.h>
33 #include <string.h>
35 /*
36 * private types
37 */
39 static int
40 sdb_object_wrapper_init(sdb_object_t *obj, va_list ap)
41 {
42 void *data = va_arg(ap, void *);
43 void (*destructor)(void *) = va_arg(ap, void (*)(void *));
45 assert(obj);
47 SDB_OBJ_WRAPPER(obj)->data = data;
48 SDB_OBJ_WRAPPER(obj)->destructor = destructor;
49 return 0;
50 } /* sdb_object_wrapper_init */
52 static void
53 sdb_object_wrapper_destroy(sdb_object_t *obj)
54 {
55 if (! obj)
56 return;
58 assert(obj->ref_cnt <= 0);
60 if (SDB_OBJ_WRAPPER(obj)->destructor && SDB_OBJ_WRAPPER(obj)->data)
61 SDB_OBJ_WRAPPER(obj)->destructor(SDB_OBJ_WRAPPER(obj)->data);
62 SDB_OBJ_WRAPPER(obj)->data = NULL;
63 } /* sdb_object_wrapper_destroy */
65 static sdb_type_t sdb_object_wrapper_type = {
66 sizeof(sdb_object_wrapper_t),
68 sdb_object_wrapper_init,
69 sdb_object_wrapper_destroy
70 };
72 /*
73 * public API
74 */
76 sdb_object_t *
77 sdb_object_create(sdb_type_t type, ...)
78 {
79 sdb_object_t *obj;
81 if (type.size <= 0)
82 return NULL;
84 obj = malloc(type.size);
85 if (! obj)
86 return NULL;
87 memset(obj, 0, sizeof(*obj));
89 if (type.init) {
90 va_list ap;
91 va_start(ap, type);
93 if (type.init(obj, ap)) {
94 obj->ref_cnt = 1;
95 sdb_object_deref(obj);
96 va_end(ap);
97 return NULL;
98 }
100 va_end(ap);
101 }
103 obj->type = type;
104 obj->ref_cnt = 1;
105 return obj;
106 } /* sdb_object_create */
108 sdb_object_t *
109 sdb_object_create_wrapper(void *data, void (*destructor)(void *))
110 {
111 return sdb_object_create(sdb_object_wrapper_type, data, destructor);
112 } /* sdb_object_create_wrapper */
114 void
115 sdb_object_deref(sdb_object_t *obj)
116 {
117 if (! obj)
118 return;
120 --obj->ref_cnt;
121 if (obj->ref_cnt > 0)
122 return;
124 if (obj->type.destroy)
125 obj->type.destroy(obj);
127 free(obj);
128 } /* sdb_object_deref */
130 void
131 sdb_object_ref(sdb_object_t *obj)
132 {
133 if (! obj)
134 return;
135 assert(obj->ref_cnt > 0);
136 ++obj->ref_cnt;
137 } /* sdb_object_ref */
139 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */