Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 59 insertions, 0 deletions

diff --git a/include/qapi/util.h b/include/qapi/util.h
new file mode 100644
index 000000000..81a2b13a3
--- /dev/null
+++ b/include/qapi/util.h
@@ -0,0 +1,59 @@
+/*
+ * QAPI util functions
+ *
+ * Copyright Fujitsu, Inc. 2014
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef QAPI_UTIL_H
+#define QAPI_UTIL_H
+
+typedef enum {
+    QAPI_DEPRECATED,
+    QAPI_UNSTABLE,
+} QapiSpecialFeature;
+
+typedef struct QEnumLookup {
+    const char *const *array;
+    const unsigned char *const special_features;
+    const int size;
+} QEnumLookup;
+
+const char *qapi_enum_lookup(const QEnumLookup *lookup, int val);
+int qapi_enum_parse(const QEnumLookup *lookup, const char *buf,
+                    int def, Error **errp);
+bool qapi_bool_parse(const char *name, const char *value, bool *obj,
+                     Error **errp);
+
+int parse_qapi_name(const char *name, bool complete);
+
+/*
+ * For any GenericList @list, insert @element at the front.
+ *
+ * Note that this macro evaluates @element exactly once, so it is safe
+ * to have side-effects with that argument.
+ */
+#define QAPI_LIST_PREPEND(list, element) do { \
+    typeof(list) _tmp = g_malloc(sizeof(*(list))); \
+    _tmp->value = (element); \
+    _tmp->next = (list); \
+    (list) = _tmp; \
+} while (0)
+
+/*
+ * For any pointer to a GenericList @tail (usually the 'next' member of a
+ * list element), insert @element at the back and update the tail.
+ *
+ * Note that this macro evaluates @element exactly once, so it is safe
+ * to have side-effects with that argument.
+ */
+#define QAPI_LIST_APPEND(tail, element) do { \
+    *(tail) = g_malloc0(sizeof(**(tail))); \
+    (*(tail))->value = (element); \
+    (tail) = &(*(tail))->next; \
+} while (0)
+
+#endif