implement support for 3-digit MNC with leading zeros

Add 3-digit flags and use the new RAI and LAI API from libosmocore throughout
the code base to be able to handle an MNC < 100 that has three digits (leading
zeros).

The changes to abis_test and gsm0408_test show that this code now handles
3-digit MNC correctly, by not dropping the leading zero as 0xf in the encoded
PLMN.

Re-implement CTRL commands 'mcc', 'mnc' and 'mcc-mnc-apply' to preserve the
presence of the third digit of the MNC. Always reply with all leading zeros.
Adjust the expected results in ctrl_test_runner.py, to show that it works.

In VTY and CTRL, the parsing of MCC and MNC is inherently made stricter by use
of osmo_{mcc,mnc}_from_str() -- they will no longer allow surplus characters
and detect errno returned by strtol() (in contrast to atoi()).

Depends: Id2240f7f518494c9df6c8bda52c0d5092f90f221 (libosmocore),
	 Ib7176b1d65a03b76f41f94bc9d3293a8a07d24c6 (libosmocore),
	 I020a4f11791c61742a3d795f782805f7b7e8733e (libosmocore)
Change-Id: I8e722103344186fde118b26d8353db95a4581daa

1 files changed, 4 insertions, 2 deletions

diff --git a/src/libbsc/net_init.c b/src/libbsc/net_init.c
index e44c335d1..d5ea5b275 100644
--- a/src/libbsc/net_init.c
+++ b/src/libbsc/net_init.c
@@ -47,8 +47,10 @@ struct gsm_network *bsc_network_init(void *ctx)
 	if (!net)
 		return NULL;
 
-	net->country_code = 1;
-	net->network_code = 1;
+	net->plmn = (struct osmo_plmn_id){
+		.mcc = 1,
+		.mnc = 1,
+	};
 
 	/* Permit a compile-time default of A5/3 and A5/1 */
 	net->a5_encryption_mask = (1 << 3) | (1 << 1);