introduce GSM_MCC_MNC_INVALID

In some cases, we want to mark an unset MCC-MNC. Define uint16-max for this
purpose.

osmo-bsc code is already doing so with a -1 and using int data types, which
will become inconvenient with the new API that handles MCC and MNC as uint16_t.

Change-Id: Ieee7add0bd6d94cf84743a49794bbcd38561b72f
---
M include/osmocom/gsm/gsm48.h
1 file changed, 4 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/64/6664/2

diff --git a/include/osmocom/gsm/gsm48.h b/include/osmocom/gsm/gsm48.h
index 37c421d..7c32cfb 100644
--- a/include/osmocom/gsm/gsm48.h
+++ b/include/osmocom/gsm/gsm48.h
@@ -11,6 +11,10 @@
 /* reserved according to GSM 03.03 ยง 2.4 */
 #define GSM_RESERVED_TMSI   0xFFFFFFFF
 
+/* Valid MCC and MNC range from 0 to 999.
+ * To mark an invalid / unset MNC, this value shall be used. */
+#define GSM_MCC_MNC_INVALID 0xFFFF
+
 /* A parsed GPRS routing area */
 struct gprs_ra_id {
        uint16_t        mcc;

-- 
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ieee7add0bd6d94cf84743a49794bbcd38561b72f
Gerrit-PatchSet: 2
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofm...@sysmocom.de>

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