From aa1f40882573b6e735cff7e3d427eec15dafc286 Mon Sep 17 00:00:00 2001
From: Yasuyuki Tanaka <yasuyuki.tanaka@inf.ethz.ch>
Date: Tue, 13 Dec 2016 15:32:21 +0100
Subject: [PATCH] packetbuf: add packetbuf_remaininglen()

packetbuf_freelen() returns the length of free space in packetbuf.
---
 core/net/packetbuf.c | 6 ++++++
 core/net/packetbuf.h | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/core/net/packetbuf.c b/core/net/packetbuf.c
index 0affa0ff2..915dfd8fa 100644
--- a/core/net/packetbuf.c
+++ b/core/net/packetbuf.c
@@ -184,6 +184,12 @@ packetbuf_totlen(void)
   return packetbuf_hdrlen() + packetbuf_datalen();
 }
 /*---------------------------------------------------------------------------*/
+uint16_t
+packetbuf_remaininglen(void)
+{
+  return PACKETBUF_SIZE - packetbuf_totlen();
+}
+/*---------------------------------------------------------------------------*/
 void
 packetbuf_attr_clear(void)
 {
diff --git a/core/net/packetbuf.h b/core/net/packetbuf.h
index 54012218f..bf96ed718 100644
--- a/core/net/packetbuf.h
+++ b/core/net/packetbuf.h
@@ -123,6 +123,13 @@ uint16_t packetbuf_datalen(void);
  */
 uint16_t packetbuf_totlen(void);
 
+/**
+ * \brief      Get the total length of the remaining space in the packetbuf
+ * \return     Length of the remaining space in the packetbuf
+ *
+ */
+uint16_t packetbuf_remaininglen(void);
+
 /**
  * \brief      Set the length of the data in the packetbuf
  * \param len  The length of the data