To be used in an upcoming commit.
Signed-off-by: Ben Pfaff <b...@nicira.com>
---
lib/ofpbuf.h | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/lib/ofpbuf.h b/lib/ofpbuf.h
index b30cbdb..9e82de2 100644
--- a/lib/ofpbuf.h
+++ b/lib/ofpbuf.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2015 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -64,6 +64,25 @@ struct ofpbuf {
enum ofpbuf_source source; /* Source of memory allocated as 'base'. */
};
+/* An initializer for a struct ofpbuf that will be initially empty and
+ * uses the space in STUB (which should be an array) as a stub.
+ *
+ * Usage example:
+ *
+ * uint64_t stub[1024 / 8]; // 1 kB stub properly aligned for 64-bit data.
+ * struct ofpbuf ofpbuf = OFPBUF_STUB_INITIALIZER(stub);
+ */
+#define OFPBUF_STUB_INITIALIZER(STUB) { \
+ .base = (STUB), \
+ .data = (STUB), \
+ .size = 0, \
+ .allocated = sizeof (STUB), \
+ .header = NULL, \
+ .msg = NULL, \
+ .list_node = OVS_LIST_POISON, \
+ .source = OFPBUF_STUB, \
+ }
+
void ofpbuf_use(struct ofpbuf *, void *, size_t);
void ofpbuf_use_stack(struct ofpbuf *, void *, size_t);
void ofpbuf_use_stub(struct ofpbuf *, void *, size_t);
--
2.1.3
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