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msgb: Add msgb_pull_to_l2() analogous to msgb_pull_to_l3() 

Introduce msgb_pull_to_l2() which pulls (removes) any msgb contents in
front of the L2 header (msg->l2h).

Change-Id: I7786a1b30f9e7eaa3dcdb3cbb2a85a126588f6cd
This commit is contained in:
Harald Welte 2017-04-15 19:04:34 +02:00
parent b522740be5
commit 59a9ebf8b8
1 changed files with 15 additions and 0 deletions
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15
include/osmocom/core/msgb.h
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@ -350,6 +350,21 @@ static inline unsigned char *msgb_pull_to_l3(struct msgb *msg)
return ret;
}
/*! \brief remove (pull) all headers in front of l2h from the message buffer.
* \param[in] msgb message buffer with a valid l2h
* \returns pointer to new start of msgb (l2h)
*
* This function moves the \a data pointer of the \ref msgb further back
* in the message, thereby shrinking the size of the message.
* l1h will be cleared.
*/
static inline unsigned char *msgb_pull_to_l2(struct msgb *msg)
{
unsigned char *ret = msgb_pull(msg, msg->l2h - msg->data);
msg->l1h = NULL;
return ret;
}
/*! \brief remove uint8 from front of message
* \param[in] msgb message buffer
* \returns 8bit value taken from end of msgb