json: remove useless return value from lexer/parser

The lexer always returns 0 when char feeding. Furthermore, none of the
caller care about the return value.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180326150916.9602-10-marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180823164025.12553-32-armbru@redhat.com>

include/qapi/qmp/json-lexer.h

@@ -47,9 +47,9 @@ struct JSONLexer
 
 void json_lexer_init(JSONLexer *lexer, JSONLexerEmitter func);
 
-int json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size);
+void json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size);
 
-int json_lexer_flush(JSONLexer *lexer);
+void json_lexer_flush(JSONLexer *lexer);
 
 void json_lexer_destroy(JSONLexer *lexer);
 

include/qapi/qmp/json-streamer.h

@@ -36,10 +36,10 @@ typedef struct JSONMessageParser
 void json_message_parser_init(JSONMessageParser *parser,
                               void (*func)(JSONMessageParser *, GQueue *));
 
-int json_message_parser_feed(JSONMessageParser *parser,
+void json_message_parser_feed(JSONMessageParser *parser,
                              const char *buffer, size_t size);
 
-int json_message_parser_flush(JSONMessageParser *parser);
+void json_message_parser_flush(JSONMessageParser *parser);
 
 void json_message_parser_destroy(JSONMessageParser *parser);
 

qobject/json-lexer.c

@@ -286,7 +286,7 @@ void json_lexer_init(JSONLexer *lexer, JSONLexerEmitter func)
     lexer->x = lexer->y = 0;
 }
 
-static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
+static void json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
 {
     int char_consumed, new_state;
 
@@ -340,7 +340,7 @@ static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
             g_string_truncate(lexer->token, 0);
             new_state = IN_START;
             lexer->state = new_state;
-            return 0;
+            return;
         default:
             break;
         }
@@ -355,29 +355,22 @@ static int json_lexer_feed_char(JSONLexer *lexer, char ch, bool flush)
         g_string_truncate(lexer->token, 0);
         lexer->state = IN_START;
     }
-
-    return 0;
 }
 
-int json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size)
+void json_lexer_feed(JSONLexer *lexer, const char *buffer, size_t size)
 {
     size_t i;
 
     for (i = 0; i < size; i++) {
-        int err;
-
-        err = json_lexer_feed_char(lexer, buffer[i], false);
-        if (err < 0) {
-            return err;
-        }
+        json_lexer_feed_char(lexer, buffer[i], false);
     }
-
-    return 0;
 }
 
-int json_lexer_flush(JSONLexer *lexer)
+void json_lexer_flush(JSONLexer *lexer)
 {
-    return lexer->state == IN_START ? 0 : json_lexer_feed_char(lexer, 0, true);
+    if (lexer->state != IN_START) {
+        json_lexer_feed_char(lexer, 0, true);
+    }
 }
 
 void json_lexer_destroy(JSONLexer *lexer)

qobject/json-streamer.c

@@ -118,15 +118,15 @@ void json_message_parser_init(JSONMessageParser *parser,
     json_lexer_init(&parser->lexer, json_message_process_token);
 }
 
-int json_message_parser_feed(JSONMessageParser *parser,
+void json_message_parser_feed(JSONMessageParser *parser,
                              const char *buffer, size_t size)
 {
-    return json_lexer_feed(&parser->lexer, buffer, size);
+    json_lexer_feed(&parser->lexer, buffer, size);
 }
 
-int json_message_parser_flush(JSONMessageParser *parser)
+void json_message_parser_flush(JSONMessageParser *parser)
 {
-    return json_lexer_flush(&parser->lexer);
+    json_lexer_flush(&parser->lexer);
 }
 
 void json_message_parser_destroy(JSONMessageParser *parser)