gsm_utils: Just add some constant and timekeeping utils

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

diff --git a/include/osmocore/gsm_utils.h b/include/osmocore/gsm_utils.h
index c87e967..195e865 100644 (file)
--- a/include/osmocore/gsm_utils.h
+++ b/include/osmocore/gsm_utils.h
@@ -27,6 +27,13 @@
 
 #include <stdint.h>
 
+#define ADD_MODULO(sum, delta, modulo) do {    \
+       if ((sum += delta) >= modulo)           \
+               sum -= modulo;                  \
+       } while (0)
+
+#define GSM_MAX_FN     (26*51*2048)
+
 struct gsm_time {
        uint32_t        fn;     /* FN count */
        uint16_t        t1;     /* FN div (26*51) */