Change in libosmocore[master]: core/msgb.h: introduce msgb_l4len() helper

[Harald Welte]

Harald Welte has submitted this change and it was merged. ( https://gerrit.osmocom.org/11647 )

Change subject: core/msgb.h: introduce msgb_l4len() helper
......................................................................

core/msgb.h: introduce msgb_l4len() helper

There is already a group of similar functions for L1, L2 and L3,
but L4 was missing. The L4 is usually used for parsing of complex
L3 messages, such as SS/USSD and SMS.

This change introduces a similar halper for L4.

Change-Id: I755f2d654bbdad2a8b4f94df9023bdd370b07ae6
---
M TODO-RELEASE
M include/osmocom/core/msgb.h
2 files changed, 13 insertions(+), 0 deletions(-)

Approvals:
  Jenkins Builder: Verified
  Harald Welte: Looks good to me, approved



diff --git a/TODO-RELEASE b/TODO-RELEASE
index 64833d2..5222ec9 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -10,3 +10,4 @@
 libosmogsm	gsm0480_l3hdr_push()	removed from gsm/gsm0480.h (was not exposed)
 libosmogsm	gsm48_push_l3hdr()	(re)introduced in gsm/gsm48.h (GSM 04.08 API)
 libosmogsm	gsm48_push_l3hdr_tid()	a wrapper around gsm48_push_l3hdr()
+libosmocore	msgb_l4len		new symbol (exposed as 'static inline' in msgb.h)
diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h
index b1cb6ec..8843db0 100644
--- a/include/osmocom/core/msgb.h
+++ b/include/osmocom/core/msgb.h
@@ -169,6 +169,18 @@
 	return msgb->tail - (uint8_t *)msgb_l3(msgb);
 }
 
+/*! determine length of L4 message
+ *  \param[in] msgb message buffer
+ *  \returns size of L4 message in bytes
+ *
+ * This function computes the number of bytes between the tail of the
+ * message and the layer 4 header.
+ */
+static inline unsigned int msgb_l4len(const struct msgb *msgb)
+{
+	return msgb->tail - (uint8_t *)msgb_sms(msgb);
+}
+
 /*! determine the length of the header
  *  \param[in] msgb message buffer
  *  \returns number of bytes between start of buffer and start of msg

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Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I755f2d654bbdad2a8b4f94df9023bdd370b07ae6
Gerrit-Change-Number: 11647
Gerrit-PatchSet: 2
Gerrit-Owner: Vadim Yanitskiy <axilirator at gmail.com>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder (1000002)
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