qstring: add qstring_get_length()

Long overdue.
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Acked-by: NGerd Hoffmann <kraxel@redhat.com>

include/qapi/qmp/qstring.h

@@ -26,6 +26,7 @@ typedef struct QString {
 QString *qstring_new(void);
 QString *qstring_from_str(const char *str);
 QString *qstring_from_substr(const char *str, int start, int end);
+size_t qstring_get_length(const QString *qstring);
 const char *qstring_get_str(const QString *qstring);
 void qstring_append_int(QString *qstring, int64_t value);
 void qstring_append(QString *qstring, const char *str);

qobject/qstring.c

@@ -31,6 +31,14 @@ QString *qstring_new(void)
     return qstring_from_str("");
 }
 
+/**
+ * qstring_get_length(): Get the length of a QString
+ */
+size_t qstring_get_length(const QString *qstring)
+{
+    return qstring->length;
+}
+
 /**
  * qstring_from_substr(): Create a new QString from a C string substring
  *