From: Alan T. DeKok <aland@freeradius.org>
Date: Sun, 20 Nov 2016 01:52:45 +0000 (-0500)
Subject: added fr_ring_buffer_start()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a22259aedbaa57311fd987c8ccbb7af38244f887;p=thirdparty%2Ffreeradius-server.git

added fr_ring_buffer_start()

Which gets "pointer + size" to the data at the start of the
ring buffer.
---

diff --git a/src/util/ring_buffer.c b/src/util/ring_buffer.c
index fc2ecca50c8..db0ebf70822 100644
--- a/src/util/ring_buffer.c
+++ b/src/util/ring_buffer.c
@@ -483,3 +483,23 @@ size_t fr_ring_buffer_used(fr_ring_buffer_t *rb)
 
 	return size;
 }
+
+/** Get a pointer to the data at the start of the ring buffer.
+ *
+ * @param[in] rb a ring buffer
+ * @param[out] p_start pointer to data at the start of the ring buffer
+ * @param[in] p_size size of the allocated block at the start of the ring buffer.
+ * @return size of the used data in the ring buffer.
+ *	- <0 on error.
+ *      - 0 on success
+ */
+int fr_ring_buffer_start(fr_ring_buffer_t *rb, uint8_t **p_start, size_t *p_size)
+{
+#ifndef NDEBUG
+	(void) talloc_get_type_abort(rb, fr_ring_buffer_t);
+#endif
+
+	*p_start = rb->buffer + rb->data_start;
+	*p_size = (rb->data_end - rb->data_start);
+	return 0;
+}
diff --git a/src/util/ring_buffer.h b/src/util/ring_buffer.h
index 699096cc249..66e5ddd9253 100644
--- a/src/util/ring_buffer.h
+++ b/src/util/ring_buffer.h
@@ -43,6 +43,8 @@ uint8_t *fr_ring_buffer_alloc(fr_ring_buffer_t *rb, size_t size) CC_HINT(nonnull
 uint8_t *fr_ring_buffer_reserve_split(fr_ring_buffer_t *dst, size_t reserve_size,
 				      fr_ring_buffer_t *src, size_t move_size) CC_HINT(nonnull);
 
+int fr_ring_buffer_start(fr_ring_buffer_t *dst, uint8_t **p_start, size_t *p_size);
+
 int fr_ring_buffer_free(fr_ring_buffer_t *rb, size_t size) CC_HINT(nonnull);
 
 int fr_ring_buffer_close(fr_ring_buffer_t *rb) CC_HINT(nonnull);