qobject: Propagate parse errors through qobject_from_jsonv()

The next few commits will put the errors to use where appropriate.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <1488317230-26248-9-git-send-email-armbru@redhat.com>

include/qapi/qmp/qjson.h

@@ -19,7 +19,8 @@
 
 QObject *qobject_from_json(const char *string);
 QObject *qobject_from_jsonf(const char *string, ...) GCC_FMT_ATTR(1, 2);
-QObject *qobject_from_jsonv(const char *string, va_list *ap) GCC_FMT_ATTR(1, 0);
+QObject *qobject_from_jsonv(const char *string, va_list *ap, Error **errp)
+    GCC_FMT_ATTR(1, 0);
 
 QString *qobject_to_json(const QObject *obj);
 QString *qobject_to_json_pretty(const QObject *obj);

qobject/qjson.c

@@ -12,6 +12,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qapi/error.h"
 #include "qapi/qmp/json-lexer.h"
 #include "qapi/qmp/json-parser.h"
 #include "qapi/qmp/json-streamer.h"
@@ -24,15 +25,17 @@ typedef struct JSONParsingState
     JSONMessageParser parser;
     va_list *ap;
     QObject *result;
+    Error *err;
 } JSONParsingState;
 
 static void parse_json(JSONMessageParser *parser, GQueue *tokens)
 {
     JSONParsingState *s = container_of(parser, JSONParsingState, parser);
-    s->result = json_parser_parse(tokens, s->ap);
+
+    s->result = json_parser_parse_err(tokens, s->ap, &s->err);
 }
 
-QObject *qobject_from_jsonv(const char *string, va_list *ap)
+QObject *qobject_from_jsonv(const char *string, va_list *ap, Error **errp)
 {
     JSONParsingState state = {};
 
@@ -43,12 +46,13 @@ QObject *qobject_from_jsonv(const char *string, va_list *ap)
     json_message_parser_flush(&state.parser);
     json_message_parser_destroy(&state.parser);
 
+    error_propagate(errp, state.err);
     return state.result;
 }
 
 QObject *qobject_from_json(const char *string)
 {
-    return qobject_from_jsonv(string, NULL);
+    return qobject_from_jsonv(string, NULL, NULL);
 }
 
 /*
@@ -61,7 +65,7 @@ QObject *qobject_from_jsonf(const char *string, ...)
     va_list ap;
 
     va_start(ap, string);
-    obj = qobject_from_jsonv(string, &ap);
+    obj = qobject_from_jsonv(string, &ap, NULL);
     va_end(ap);
 
     assert(obj != NULL);

tests/libqtest.c

@@ -442,7 +442,7 @@ void qmp_fd_sendv(int fd, const char *fmt, va_list ap)
      * is an array type.
      */
     va_copy(ap_copy, ap);
-    qobj = qobject_from_jsonv(fmt, &ap_copy);
+    qobj = qobject_from_jsonv(fmt, &ap_copy, NULL);
     va_end(ap_copy);
 
     /* No need to send anything for an empty QObject.  */

tests/test-qobject-input-visitor.c

@@ -51,7 +51,7 @@ static Visitor *visitor_input_test_init_internal(TestInputVisitorData *data,
 {
     visitor_input_teardown(data, NULL);
 
-    data->obj = qobject_from_jsonv(json_string, ap);
+    data->obj = qobject_from_jsonv(json_string, ap, NULL);
     g_assert(data->obj);
 
     if (keyval) {