[PATCH 3/6] 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 |   86 +++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 86 insertions(+), 0 deletions(-)

diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c
index e33b130..edbd3b4 100644
--- a/tools/libxl/libxl_qmp.c
+++ b/tools/libxl/libxl_qmp.c
@@ -623,6 +623,92 @@ static void qmp_free_handler(libxl__qmp_handler *qmp)
     free(qmp);
 }
 
+#if 0
+/*
+ * QMP Parameters Helpers
+ * If a function fail to allocate memomy for one more parameters, then
+ * the param is free, even if it's come from a caller.
+ */
+static libxl__json_object *qmp_parameters_common(libxl__gc *gc,
+                                                 libxl__json_object *param,
+                                                 const char *name,
+                                                 libxl__json_object *obj)
+{
+    // check that every caller of this free the tree !
+    libxl__json_map_node *arg = NULL;
+    if (!param) {
+        param = libxl__json_object_alloc(gc, JSON_MAP);
+        if (!param)
+            return NULL;
+    }
+    arg = calloc(1, sizeof (libxl__json_map_node));
+    if (!arg)
+        goto error_nomem;
+
+    if (flexarray_append(param->u.map, arg) == 2) {
+        free(arg);
+        goto error_nomem;
+    }
+
+    arg->map_key = strdup(name);
+    if (!arg->map_key)
+        goto error_nomem;
+
+    arg->obj = obj;
+
+    return param;
+error_nomem:
+    libxl__json_object_free(gc, param);
+    return NULL;
+}
+
+static libxl__json_object *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(gc, JSON_STRING);
+    if (!obj)
+        goto error_nomem;
+    obj->u.string = strdup(argument);
+    if (!obj->u.string)
+        goto error_nomem;
+
+    param = qmp_parameters_common(gc, param, name, obj);
+    if (!param)
+        goto error_nomem;
+
+    return param;
+error_nomem:
+    libxl__json_object_free(gc, param);
+    libxl__json_object_free(gc, obj);
+    return NULL;
+}
+
+static libxl__json_object *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(gc, JSON_TRUE);
+    if (!obj)
+        goto error_nomem;
+
+    param = qmp_parameters_common(gc, param, name, obj);
+    if (!param)
+        goto error_nomem;
+
+    return param;
+error_nomem:
+    libxl__json_object_free(gc, param);
+    libxl__json_object_free(gc, obj);
+    return NULL;
+}
+#endif
+
 /*
  * API
  */
-- 
Anthony PERARD