From 5dd8d1bbd89cfaa10d8194502778deb96fe82184 Mon Sep 17 00:00:00 2001 From: Max Date: Wed, 8 Mar 2017 12:06:42 +0100 Subject: bts.cpp: Fix overloading ambiguity MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fix error introduced in 1275a3f91a744e011b0dba82b09124d249c7abb5 by using signed 32 bit integer which is enough for Frame Number in GSM. Also, mark parameter constraints more explicitly: - add assert for expected FN values - don't perform computation for non-relative FN The error was: bts.cpp: In member function ‘uint32_t BTS::rfn_to_fn(uint32_t)’: bts.cpp:554:25: error: call of overloaded ‘abs(uint32_t)’ is ambiguous if (abs(rfn - m_cur_rfn) > RFN_THRESHOLD) { ^ In file included from /usr/include/c++/6/cstdlib:75:0, from /usr/include/c++/6/stdlib.h:36, from /usr/include/osmocom/core/linuxrbtree.h:97, from /usr/include/osmocom/core/timer.h:35, from ./bts.h:29, from bts.cpp:21: /usr/include/stdlib.h:735:12: note: candidate: int abs(int) extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur; ^~~ In file included from /usr/include/c++/6/stdlib.h:36:0, from /usr/include/osmocom/core/linuxrbtree.h:97, from /usr/include/osmocom/core/timer.h:35, from ./bts.h:29, from bts.cpp:21: /usr/include/c++/6/cstdlib:185:3: note: candidate: __int128 std::abs(__int128) abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; } ^~~ /usr/include/c++/6/cstdlib:180:3: note: candidate: long long int std::abs(long long int) abs(long long __x) { return __builtin_llabs (__x); } ^~~ /usr/include/c++/6/cstdlib:172:3: note: candidate: long int std::abs(long int) abs(long __i) { return __builtin_labs(__i); } Change-Id: Ib6d895a97aa35414f245ea4406c6e78f1b4fb5b8 --- src/bts.cpp | 15 ++++++++++----- src/bts.h | 2 +- 2 files changed, 11 insertions(+), 6 deletions(-) diff --git a/src/bts.cpp b/src/bts.cpp index 548d0009..c36647ec 100644 --- a/src/bts.cpp +++ b/src/bts.cpp @@ -521,11 +521,15 @@ int BTS::rcv_imm_ass_cnf(const uint8_t *data, uint32_t fn) } /* Determine the full frame number from a relative frame number */ -uint32_t BTS::rfn_to_fn(uint32_t rfn) +uint32_t BTS::rfn_to_fn(int32_t rfn) { - uint32_t m_cur_rfn; - uint32_t fn; - uint32_t fn_rounded; + int32_t m_cur_rfn; + int32_t fn; + int32_t fn_rounded; + + /* double-check that relative FN is not negative and fits into int32_t */ + OSMO_ASSERT(rfn < GSM_MAX_FN); + OSMO_ASSERT(rfn >= 0); /* Note: If a BTS is sending in a rach request it will be fully aware * of the frame number. If the PCU is used in a BSC-co-located setup. @@ -536,7 +540,8 @@ uint32_t BTS::rfn_to_fn(uint32_t rfn) /* Ensure that all following calculations are performed with the * relative frame number */ - rfn = rfn % 42432; + if (rfn >= RFN_MODULUS) + return rfn; /* Compute an internal relative frame number from the full internal frame number */ diff --git a/src/bts.h b/src/bts.h index 5d8dc592..78ed002b 100644 --- a/src/bts.h +++ b/src/bts.h @@ -350,7 +350,7 @@ public: uint8_t is_single_block(uint16_t ra, enum ph_burst_type burst_type, uint8_t is_11bit, uint16_t *ms_class, uint16_t *priority); - uint32_t rfn_to_fn(uint32_t rfn); + uint32_t rfn_to_fn(int32_t rfn); int rcv_rach(uint16_t ra, uint32_t Fn, int16_t qta, uint8_t is_11bit, enum ph_burst_type burst_type); -- cgit v1.2.3