[PATCH V2 4/9] libxl_qmp: Introduces helpers to create an argument list.

[Anthony PERARD <anthony.perard@citrix.com>]

Those functions will be used to create a "list" of parameters that contain more
than just strings. This list is converted by qmp_send to a string to be sent to
QEMU.

Those functions will be used in the next two patches, so right now there are
not compiled.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 tools/libxl/libxl_qmp.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c
index 07a8bd5..1dd5c6c 100644
--- a/tools/libxl/libxl_qmp.c
+++ b/tools/libxl/libxl_qmp.c
@@ -623,6 +623,59 @@ static void qmp_free_handler(libxl__qmp_handler *qmp)
     free(qmp);
 }
 
+#if 0
+/*
+ * QMP Parameters Helpers
+ * Those functions does not use the gc, because of the internal usage of
+ * flexarray that does not support it.
+ * The allocated *param need to be free with libxl__json_object_free(gc, param)
+ */
+static void qmp_parameters_common_add(libxl__gc *gc,
+                                      libxl__json_object **param,
+                                      const char *name,
+                                      libxl__json_object *obj)
+{
+    libxl__json_map_node *arg = NULL;
+
+    if (!*param) {
+        *param = libxl__json_object_alloc(NOGC, JSON_MAP);
+    }
+
+    arg = libxl__zalloc(NOGC, sizeof(*arg));
+
+    arg->map_key = libxl__strdup(NOGC, name);
+    arg->obj = obj;
+
+    flexarray_append((*param)->u.map, arg);
+}
+
+static void qmp_parameters_add_string(libxl__gc *gc,
+                                      libxl__json_object **param,
+                                      const char *name, const char *argument)
+{
+    libxl__json_object *obj;
+
+    obj = libxl__json_object_alloc(NOGC, JSON_STRING);
+    obj->u.string = libxl__strdup(NOGC, argument);
+
+    qmp_parameters_common_add(gc, param, name, obj);
+}
+
+static void qmp_parameters_add_bool(libxl__gc *gc,
+                                    libxl__json_object **param,
+                                    const char *name, bool b)
+{
+    libxl__json_object *obj;
+
+    obj = libxl__json_object_alloc(NOGC, JSON_TRUE);
+    qmp_parameters_common_add(gc, param, name, obj);
+}
+
+#define QMP_PARAMETERS_SPRINTF(gc, args, name, format, ...) \
+    qmp_parameters_add_string(gc, args, name, \
+                              libxl__sprintf(gc, format, __VA_ARGS__))
+#endif
+
 /*
  * API
  */
-- 
Anthony PERARD