json-lexer: fix escaped backslash in single-quoted string

This made the lexer wait for a closing *double* quote.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

qobject/json-lexer.c

@@ -138,8 +138,8 @@ static const uint8_t json_lexer[][256] =  {
         ['n'] =  IN_SQ_STRING,
         ['r'] =  IN_SQ_STRING,
         ['t'] =  IN_SQ_STRING,
-        ['/'] = IN_DQ_STRING,
-        ['\\'] = IN_DQ_STRING,
+        ['/'] = IN_SQ_STRING,
+        ['\\'] = IN_SQ_STRING,
         ['\''] = IN_SQ_STRING,
         ['\"'] = IN_SQ_STRING,
         ['u'] = IN_SQ_UCODE0,

tests/check-qjson.c

@@ -45,6 +45,13 @@ static void escaped_string(void)
         { "\"single byte utf-8 \\u0020\"", "single byte utf-8  ", .skip = 1 },
         { "\"double byte utf-8 \\u00A2\"", "double byte utf-8 \xc2\xa2" },
         { "\"triple byte utf-8 \\u20AC\"", "triple byte utf-8 \xe2\x82\xac" },
+        { "'\\b'", "\b", .skip = 1 },
+        { "'\\f'", "\f", .skip = 1 },
+        { "'\\n'", "\n", .skip = 1 },
+        { "'\\r'", "\r", .skip = 1 },
+        { "'\\t'", "\t", .skip = 1 },
+        { "'\\/'", "/", .skip = 1 },
+        { "'\\\\'", "\\", .skip = 1 },
         {}
     };