block: User BdrvChild callback for device name
[qemu.git] / qjson.c
1 /*
2 * QEMU JSON writer
3 *
4 * Copyright Alexander Graf
5 *
6 * Authors:
7 * Alexander Graf <agraf@suse.de>
8 *
9 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
10 * See the COPYING.LIB file in the top-level directory.
11 *
12 */
13
14 #include "qemu/osdep.h"
15 #include <qapi/qmp/qstring.h>
16 #include <glib.h>
17 #include <qjson.h>
18 #include <qemu/module.h>
19 #include <qom/object.h>
20
21 struct QJSON {
22 Object obj;
23 QString *str;
24 bool omit_comma;
25 };
26
27 #define QJSON(obj) OBJECT_CHECK(QJSON, (obj), TYPE_QJSON)
28
29 static void json_emit_element(QJSON *json, const char *name)
30 {
31 /* Check whether we need to print a , before an element */
32 if (json->omit_comma) {
33 json->omit_comma = false;
34 } else {
35 qstring_append(json->str, ", ");
36 }
37
38 if (name) {
39 qstring_append(json->str, "\"");
40 qstring_append(json->str, name);
41 qstring_append(json->str, "\" : ");
42 }
43 }
44
45 void json_start_object(QJSON *json, const char *name)
46 {
47 json_emit_element(json, name);
48 qstring_append(json->str, "{ ");
49 json->omit_comma = true;
50 }
51
52 void json_end_object(QJSON *json)
53 {
54 qstring_append(json->str, " }");
55 json->omit_comma = false;
56 }
57
58 void json_start_array(QJSON *json, const char *name)
59 {
60 json_emit_element(json, name);
61 qstring_append(json->str, "[ ");
62 json->omit_comma = true;
63 }
64
65 void json_end_array(QJSON *json)
66 {
67 qstring_append(json->str, " ]");
68 json->omit_comma = false;
69 }
70
71 void json_prop_int(QJSON *json, const char *name, int64_t val)
72 {
73 json_emit_element(json, name);
74 qstring_append_int(json->str, val);
75 }
76
77 void json_prop_str(QJSON *json, const char *name, const char *str)
78 {
79 json_emit_element(json, name);
80 qstring_append_chr(json->str, '"');
81 qstring_append(json->str, str);
82 qstring_append_chr(json->str, '"');
83 }
84
85 const char *qjson_get_str(QJSON *json)
86 {
87 return qstring_get_str(json->str);
88 }
89
90 QJSON *qjson_new(void)
91 {
92 QJSON *json = QJSON(object_new(TYPE_QJSON));
93 return json;
94 }
95
96 void qjson_finish(QJSON *json)
97 {
98 json_end_object(json);
99 }
100
101 static void qjson_initfn(Object *obj)
102 {
103 QJSON *json = QJSON(obj);
104
105 json->str = qstring_from_str("{ ");
106 json->omit_comma = true;
107 }
108
109 static void qjson_finalizefn(Object *obj)
110 {
111 QJSON *json = QJSON(obj);
112
113 qobject_decref(QOBJECT(json->str));
114 }
115
116 static const TypeInfo qjson_type_info = {
117 .name = TYPE_QJSON,
118 .parent = TYPE_OBJECT,
119 .instance_size = sizeof(QJSON),
120 .instance_init = qjson_initfn,
121 .instance_finalize = qjson_finalizefn,
122 };
123
124 static void qjson_register_types(void)
125 {
126 type_register_static(&qjson_type_info);
127 }
128
129 type_init(qjson_register_types)