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authorMarkus Armbruster <armbru@redhat.com>2020-12-11 18:11:47 +0100
committerMarkus Armbruster <armbru@redhat.com>2020-12-19 10:39:16 +0100
commit998da0b1581bfda6d6d0e82b9e42edfa1bf5cfe5 (patch)
tree6b2046f40c846775fa91b1b205f61f0e277ddb15 /include
parent91f54d92c752e392be4903c9ad2846b2cdd0398d (diff)
qobject: Factor JSON writer out of qobject_to_json()
We have two JSON writers written in C: qobject/qjson.c provides qobject_to_json(), and migration/qjson.c provides a more low level imperative interface. They don't share code. The latter tacitly limits numbers to int64_t, and strings contents to characters that don't need escaping. Factor out qobject_to_json()'s JSON writer as qobject/json-writer.c. Straightforward, except for numbers: since the writer is to be independent of QObject, it can't use qnum_to_string(). Open-code it instead. This is actually an improvement of sorts, because it liberates qnum_to_string() from JSON's needs: its JSON-related FIXMEs move to the JSON writer, where they belong. The next commit will replace migration/qjson.c. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20201211171152.146877-16-armbru@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/qapi/qmp/json-writer.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/include/qapi/qmp/json-writer.h b/include/qapi/qmp/json-writer.h
new file mode 100644
index 0000000000..708d129018
--- /dev/null
+++ b/include/qapi/qmp/json-writer.h
@@ -0,0 +1,37 @@
+/*
+ * JSON Writer
+ *
+ * Copyright (c) 2020 Red Hat Inc.
+ *
+ * Authors:
+ * Markus Armbruster <armbru@redhat.com>
+ *
+ * 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.
+ *
+ */
+
+#ifndef JSON_WRITER_H
+#define JSON_WRITER_H
+
+typedef struct JSONWriter JSONWriter;
+
+JSONWriter *json_writer_new(bool pretty);
+const char *json_writer_get(JSONWriter *);
+GString *json_writer_get_and_free(JSONWriter *);
+void json_writer_free(JSONWriter *);
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(JSONWriter, json_writer_free)
+
+void json_writer_start_object(JSONWriter *, const char *name);
+void json_writer_end_object(JSONWriter *);
+void json_writer_start_array(JSONWriter *, const char *name);
+void json_writer_end_array(JSONWriter *);
+void json_writer_bool(JSONWriter *, const char *name, bool val);
+void json_writer_null(JSONWriter *, const char *name);
+void json_writer_int64(JSONWriter *, const char *name, int64_t val);
+void json_writer_uint64(JSONWriter *, const char *name, uint64_t val);
+void json_writer_double(JSONWriter *, const char *name, double val);
+void json_writer_str(JSONWriter *, const char *name, const char *str);
+
+#endif