diff options
Diffstat (limited to 'src/lbitlib.c')
| -rw-r--r-- | src/lbitlib.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/lbitlib.c b/src/lbitlib.c index 9637532..31c7b66 100644 --- a/src/lbitlib.c +++ b/src/lbitlib.c @@ -1,5 +1,5 @@ /* -** $Id: lbitlib.c,v 1.18 2013/03/19 13:19:12 roberto Exp $ +** $Id: lbitlib.c,v 1.18.1.2 2013/07/09 18:01:41 roberto Exp $ ** Standard library for bitwise operations ** See Copyright Notice in lua.h */ @@ -129,7 +129,8 @@ static int b_rot (lua_State *L, int i) { b_uint r = luaL_checkunsigned(L, 1); i &= (LUA_NBITS - 1); /* i = i % NBITS */ r = trim(r); - r = (r << i) | (r >> (LUA_NBITS - i)); + if (i != 0) /* avoid undefined shift of LUA_NBITS when i == 0 */ + r = (r << i) | (r >> (LUA_NBITS - i)); lua_pushunsigned(L, trim(r)); return 1; } |