Convert GprsMS and helpers classes to C

As we integrate osmo-pcu more and more with libosmocore features, it
becomes really hard to use them since libosmocore relies heavily on C
specific compilation features, which are not available in old C++
compilers (such as designated initializers for complex types in FSMs).

GprsMs is right now a quite simple object since initial design of
osmo-pcu made it optional and most of the logic was placed and stored
duplicated in TBF objects. However, that's changing as we introduce more
features, with the GprsMS class getting more weight. Hence, let's move
it now to be a C struct in order to be able to easily use libosmocore
features there, such as FSMs.

Some helper classes which GprsMs uses are also mostly move to C since
they are mostly structs with methods, so there's no point in having
duplicated APIs for C++ and C for such simple cases.

For some more complex classes, like (ul_,dl_)tbf, C API bindings are
added where needed so that GprsMs can use functionalitites from that
class. Most of those APIs can be kept afterwards and drop the C++ ones
since they provide no benefit in general.

Change-Id: I0b50e3367aaad9dcada76da97b438e452c8b230c

1 files changed, 13 insertions, 17 deletions

diff --git a/src/tbf_ul.h b/src/tbf_ul.h
index 9ccdf620..1d9cf50c 100644
--- a/src/tbf_ul.h
+++ b/src/tbf_ul.h
@@ -108,32 +108,28 @@ protected:
 	gprs_rlc_ul_window m_window;
 };
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-void update_tbf_ta(struct gprs_rlcmac_ul_tbf *tbf, int8_t ta_delta);
-void set_tbf_ta(struct gprs_rlcmac_ul_tbf *tbf, uint8_t ta);
-#ifdef __cplusplus
-}
-#endif
-
 inline uint16_t gprs_rlcmac_ul_tbf::window_size() const
 {
 	return m_window.ws();
 }
 
-inline gprs_rlcmac_ul_tbf *as_ul_tbf(gprs_rlcmac_tbf *tbf)
-{
-	if (tbf && tbf->direction == GPRS_RLCMAC_UL_TBF)
-		return static_cast<gprs_rlcmac_ul_tbf *>(tbf);
-	else
-		return NULL;
-}
-
 struct gprs_rlcmac_ul_tbf *tbf_alloc_ul_tbf(struct gprs_rlcmac_bts *bts, GprsMs *ms, int8_t use_trx, bool single_slot);
 struct gprs_rlcmac_ul_tbf *tbf_alloc_ul(struct gprs_rlcmac_bts *bts, GprsMs *ms,
 					int8_t use_trx, uint32_t tlli);
 struct gprs_rlcmac_ul_tbf *handle_tbf_reject(struct gprs_rlcmac_bts *bts,
 	GprsMs *ms, uint32_t tlli, uint8_t trx_no, uint8_t ts_no);
 
+#else /* ifdef __cplusplus */
+struct gprs_rlcmac_ul_tbf;
+#endif
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void update_tbf_ta(struct gprs_rlcmac_ul_tbf *tbf, int8_t ta_delta);
+void set_tbf_ta(struct gprs_rlcmac_ul_tbf *tbf, uint8_t ta);
+struct gprs_rlcmac_ul_tbf *as_ul_tbf(struct gprs_rlcmac_tbf *tbf);
+#ifdef __cplusplus
+}
 #endif