Fix ceil(::FD) at the input limits

Author: omus

src/FixedPointDecimals.jl

@@ -171,7 +171,7 @@ function round{T, f}(x::FD{T, f}, ::RoundingMode{:Nearest}=RoundNearest)
     FD{T, f}(_round_to_even(quotient, remainder, powt))
 end
 function ceil{T, f}(x::FD{T, f})
-    powt = T(10)^f
+    powt = coefficient(FD{T, f})
     quotient, remainder = fldmod(x.i, powt)
     if remainder > 0
         FD{T, f}(quotient + one(quotient))

test/runtests.jl

@@ -589,6 +589,9 @@ epsi{T}(::Type{T}) = eps(T)
                 else
                     @test_throws InexactError floor(reinterpret(FD{$T,$f}, typemin($T)))
                 end
+
+                @test_throws InexactError ceil(reinterpret(FD{$T,$f}, typemax($T)))
+                @test ceil(reinterpret(FD{$T,$f}, typemin($T))) == zero(FD{$T,$f})
             end
         end
     end