5ebcff213d827fdb0404e8d7a505ae3c0fcfc9f4
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 helper functions
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 /*
66 * public API
67 */
69 sdb_object_t *
70 sdb_object_create(size_t size, int (*init)(sdb_object_t *, va_list),
71 void (*destructor)(sdb_object_t *), ...)
72 {
73 sdb_object_t *obj;
75 obj = malloc(size);
76 if (! obj)
77 return NULL;
78 memset(obj, 0, sizeof(*obj));
80 if (init) {
81 va_list ap;
82 va_start(ap, destructor);
84 if (init(obj, ap)) {
85 obj->ref_cnt = 1;
86 sdb_object_deref(obj);
87 va_end(ap);
88 return NULL;
89 }
91 va_end(ap);
92 }
94 obj->ref_cnt = 1;
95 obj->destructor = destructor;
96 obj->size = size;
97 return obj;
98 } /* sdb_object_create */
100 sdb_object_t *
101 sdb_object_create_wrapper(void *data, void (*destructor)(void *))
102 {
103 return sdb_object_create(sizeof(sdb_object_wrapper_t),
104 sdb_object_wrapper_init, sdb_object_wrapper_destroy,
105 data, destructor);
106 } /* sdb_object_create_wrapper */
108 void
109 sdb_object_deref(sdb_object_t *obj)
110 {
111 if (! obj)
112 return;
114 --obj->ref_cnt;
115 if (obj->ref_cnt > 0)
116 return;
118 if (obj->destructor)
119 obj->destructor(obj);
121 free(obj);
122 } /* sdb_object_deref */
124 void
125 sdb_object_ref(sdb_object_t *obj)
126 {
127 if (! obj)
128 return;
129 assert(obj->ref_cnt > 0);
130 ++obj->ref_cnt;
131 } /* sdb_object_ref */
133 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */