X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fofpbuf.c;h=1621bcc198128e9140323a32891ab9d99e9cef82;hb=15c93f417f8dd87f1655448b7c4c59e3fb8b5aba;hp=fd01ea8d0227b5af4e8062ff17ee367feccc4c0d;hpb=5019f688d4e3117960503d57978ff2e0fb3771e0;p=openvswitch

diff --git a/lib/ofpbuf.c b/lib/ofpbuf.c
index fd01ea8d..1621bcc1 100644
--- a/lib/ofpbuf.c
+++ b/lib/ofpbuf.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
+#include "dynamic-string.h"
 #include "util.h"
 
 /* Initializes 'b' as an empty ofpbuf that contains the 'allocated' bytes of
@@ -218,6 +219,17 @@ ofpbuf_push_uninit(struct ofpbuf *b, size_t size)
     return b->data;
 }
 
+/* Prefixes 'size' zeroed bytes to the head end of 'b'.  'b' must have at least
+ * 'size' bytes of headroom.  Returns a pointer to the first byte of the data's
+ * location in the ofpbuf. */
+void *
+ofpbuf_push_zeros(struct ofpbuf *b, size_t size)
+{
+    void *dst = ofpbuf_push_uninit(b, size);
+    memset(dst, 0, size);
+    return dst;
+}
+
 void *
 ofpbuf_push(struct ofpbuf *b, const void *p, size_t size) 
 {
@@ -286,3 +298,18 @@ ofpbuf_try_pull(struct ofpbuf *b, size_t size)
 {
     return b->size >= size ? ofpbuf_pull(b, size) : NULL;
 }
+
+/* Returns a string that describes some of 'b''s metadata plus a hex dump of up
+ * to 'maxbytes' from the start of the buffer. */
+char *
+ofpbuf_to_string(const struct ofpbuf *b, size_t maxbytes)
+{
+    struct ds s;
+
+    ds_init(&s);
+    ds_put_format(&s, "size=%zu, allocated=%zu, head=%zu, tail=%zu\n",
+                  b->size, b->allocated,
+                  ofpbuf_headroom(b), ofpbuf_tailroom(b));
+    ds_put_hex_dump(&s, b->data, MIN(b->size, maxbytes), 0, false);
+    return ds_cstr(&s);
+}