tree 35cf450fc871395f4259e46e953edea392e7df0f
parent 8a3c83ed00104bdb326c160a36c8f2b0625eeabd
author Neels Hofmeyr <nhofmeyr@sysmocom.de> 1465229123 +0200
committer Neels Hofmeyr <nhofmeyr@sysmocom.de> 1465839980 +0000

add get_value_string_or_null() to handle unknown items

Add get_value_string_or_null() to return NULL in case the given value is not
found in the list of strings, to be able to cleanly fall back to another list
of strings. Absorb the lookup loop from get_value_string().

Context: in osmo-bts, I want to look up an RSL message name in rsl_msgt_names
and fall back to rsl_ipac_msgt_names if not found, because the IPAC PDCH ACT
and DEACT messages are sent in a standard ABIS_RSL_MDISC_DED_CHAN.
In a subsequent commit, get_value_string_or_null() will be used by new
rsl_or_ipac_msg_name().

Change-Id: I1fa3907e28d528d2758bc3eae9d19e6c1168f5e5
Reviewed-on: https://gerrit.osmocom.org/230
Reviewed-by: Harald Welte <laforge@gnumonks.org>
Tested-by: Jenkins Builder