Add CBS_dup() to initialize a new CBS with the same values.

This is useful for when you need to check the data ahead and then continue
on from the same spot.

input + ok jsing@ miod@

1 files changed, 7 insertions, 1 deletions

diff --git a/src/lib/libssl/bs_cbs.c b/src/lib/libssl/bs_cbs.c
index 45c253cc4b..8173177249 100644
--- a/src/lib/libssl/bs_cbs.c
+++ b/src/lib/libssl/bs_cbs.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: bs_cbs.c,v 1.13 2015/06/17 07:25:56 doug Exp $        */
+/*      $OpenBSD: bs_cbs.c,v 1.14 2015/06/19 00:23:36 doug Exp $        */
 /*
  * Copyright (c) 2014, Google Inc.
  *
@@ -32,6 +32,12 @@ CBS_init(CBS *cbs, const uint8_t *data, size_t len)
         cbs->len = len;
 }
 
+void
+CBS_dup(const CBS *cbs, CBS *out)
+{
+        CBS_init(out, CBS_data(cbs), CBS_len(cbs));
+}
+
 static int
 cbs_get(CBS *cbs, const uint8_t **p, size_t n)
 {