From 738fbc66d096575bb9a1694056ce2d627a70c03d Mon Sep 17 00:00:00 2001 From: est31 Date: Tue, 11 Aug 2015 19:07:56 +0200 Subject: Fix Lua PcgRandom Before, this lua code led to a crash: local pcg = PcgRandom(42) local value = pcg:next() This was because if you called s32 PcgRandom::range(min, max) with the minimum and maximum possible values for s32 integers (which the lua binding code did), u32 PcgRandom::range(bound) got called with 0 as the bound. The bound however is one above the maximum value, so 0 is a "special" value to pass to this function. This commit fixes the lua crash by assigning the RNG's full range to the bound 0, which is also fits to the "maximum is bound - 1" principle, as (u32)-1 is the maximum value in the u32 range. --- src/unittest/test_random.cpp | 3 +++ 1 file changed, 3 insertions(+) (limited to 'src/unittest') diff --git a/src/unittest/test_random.cpp b/src/unittest/test_random.cpp index 20cfca334..bbee57719 100644 --- a/src/unittest/test_random.cpp +++ b/src/unittest/test_random.cpp @@ -101,6 +101,9 @@ void TestRandom::testPcgRandomRange() EXCEPTION_CHECK(PrngException, pr.range(5, 1)); + // Regression test for bug 3027 + pr.range(pr.RANDOM_MIN, pr.RANDOM_MAX); + for (u32 i = 0; i != 32768; i++) { int min = (pr.next() % 3000) - 500; int max = (pr.next() % 3000) - 500; -- cgit v1.2.3