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-rw-r--r--qemu/qjson.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/qemu/qjson.c b/qemu/qjson.c
new file mode 100644
index 000000000..e478802a4
--- /dev/null
+++ b/qemu/qjson.c
@@ -0,0 +1,129 @@
+/*
+ * QEMU JSON writer
+ *
+ * Copyright Alexander Graf
+ *
+ * Authors:
+ * Alexander Graf <agraf@suse.de>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#include <qapi/qmp/qstring.h>
+#include <stdbool.h>
+#include <glib.h>
+#include <qjson.h>
+#include <qemu/module.h>
+#include <qom/object.h>
+
+struct QJSON {
+ Object obj;
+ QString *str;
+ bool omit_comma;
+};
+
+#define QJSON(obj) OBJECT_CHECK(QJSON, (obj), TYPE_QJSON)
+
+static void json_emit_element(QJSON *json, const char *name)
+{
+ /* Check whether we need to print a , before an element */
+ if (json->omit_comma) {
+ json->omit_comma = false;
+ } else {
+ qstring_append(json->str, ", ");
+ }
+
+ if (name) {
+ qstring_append(json->str, "\"");
+ qstring_append(json->str, name);
+ qstring_append(json->str, "\" : ");
+ }
+}
+
+void json_start_object(QJSON *json, const char *name)
+{
+ json_emit_element(json, name);
+ qstring_append(json->str, "{ ");
+ json->omit_comma = true;
+}
+
+void json_end_object(QJSON *json)
+{
+ qstring_append(json->str, " }");
+ json->omit_comma = false;
+}
+
+void json_start_array(QJSON *json, const char *name)
+{
+ json_emit_element(json, name);
+ qstring_append(json->str, "[ ");
+ json->omit_comma = true;
+}
+
+void json_end_array(QJSON *json)
+{
+ qstring_append(json->str, " ]");
+ json->omit_comma = false;
+}
+
+void json_prop_int(QJSON *json, const char *name, int64_t val)
+{
+ json_emit_element(json, name);
+ qstring_append_int(json->str, val);
+}
+
+void json_prop_str(QJSON *json, const char *name, const char *str)
+{
+ json_emit_element(json, name);
+ qstring_append_chr(json->str, '"');
+ qstring_append(json->str, str);
+ qstring_append_chr(json->str, '"');
+}
+
+const char *qjson_get_str(QJSON *json)
+{
+ return qstring_get_str(json->str);
+}
+
+QJSON *qjson_new(void)
+{
+ QJSON *json = QJSON(object_new(TYPE_QJSON));
+ return json;
+}
+
+void qjson_finish(QJSON *json)
+{
+ json_end_object(json);
+}
+
+static void qjson_initfn(Object *obj)
+{
+ QJSON *json = QJSON(obj);
+
+ json->str = qstring_from_str("{ ");
+ json->omit_comma = true;
+}
+
+static void qjson_finalizefn(Object *obj)
+{
+ QJSON *json = QJSON(obj);
+
+ qobject_decref(QOBJECT(json->str));
+}
+
+static const TypeInfo qjson_type_info = {
+ .name = TYPE_QJSON,
+ .parent = TYPE_OBJECT,
+ .instance_size = sizeof(QJSON),
+ .instance_init = qjson_initfn,
+ .instance_finalize = qjson_finalizefn,
+};
+
+static void qjson_register_types(void)
+{
+ type_register_static(&qjson_type_info);
+}
+
+type_init(qjson_register_types)