osmocom
/
libosmocore
mirror of https://gerrit.osmocom.org/libosmocore
11
0
Fork 0
Code Issues Releases Wiki Activity

Add msgb_tl_put() helper 

When adding complex TLV structures where length of V is not known in
advance it's handy to be able to simply add Tag and save the pointer to
the Length field so it can be updated once entire Value is added and its
length is known.

Change-Id: I8dc1e4880352833a0a49c1dd0d7cb4148ac43aff
This commit is contained in:
Max 2018-12-03 15:33:52 +01:00
parent 30b2e348df
commit d82070c383
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/osmocom/gsm/tlv.h
View File

@ -324,6 +324,18 @@ static inline uint8_t *msgb_v_put(struct msgb *msg, uint8_t val)
return v_put(buf, val);
}
/*! put (append) a TL fields to a \ref msgb
* \returns pointer to the length field so it can be updated after adding new information under specified tag */
static inline uint8_t *msgb_tl_put(struct msgb *msg, uint8_t tag)
{
uint8_t *len = msgb_v_put(msg, tag);
/* reserve space for length, len points to this reserved space already */
msgb_v_put(msg, 0);
return len;
}
/*! put (append) a TV16 field to a \ref msgb
* \returns pointer to first byte after newly-put information */
static inline uint8_t *msgb_tv16_put(struct msgb *msg, uint8_t tag, uint16_t val)