don't disable checks in ptrops

stew/byteutils.nim

@@ -1,5 +1,5 @@
 # byteutils
-# Copyright (c) 2018 Status Research & Development GmbH
+# Copyright (c) 2018-2022 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
@@ -29,7 +29,7 @@ proc readHexChar*(c: char): byte
   of 'a'..'f': result = byte(ord(c) - ord('a') + 10)
   of 'A'..'F': result = byte(ord(c) - ord('A') + 10)
   else:
-    raise newException(ValueError, $c & " is not a hexademical character")
+    raise newException(ValueError, $c & " is not a hexadecimal character")
 
 template skip0xPrefix(hexStr: string): int =
   ## Returns the index of the first meaningful char in `hexStr` by skipping

stew/ptrops.nim

@@ -34,14 +34,8 @@ template offset*[T](p: ptr T, count: int): ptr T =
 
   # Actual behavior is wrapping, but this may be revised in the future to enable
   # better optimizations.
-
-  # We turn off checking here - too large counts is UB
-  {.push checks: off.}
-  let
-    bytes = count * sizeof(T)
-    res = cast[ptr T](offset(cast[pointer](p), bytes))
-  {.pop.}
-  res
+  let bytes = count * sizeof(T)
+  cast[ptr T](offset(cast[pointer](p), bytes))
 
 template distance*(a, b: pointer): int =
   ## Number of bytes between a and b - undefined behavior when difference
@@ -53,7 +47,4 @@ template distance*(a, b: pointer): int =
 template distance*[T](a, b: ptr T): int =
   # Number of elements between a and b - undefined behavior when difference
   # exceeds what can be represented in an int
-  {.push checks: off.}
-  let res = distance(cast[pointer](a), cast[pointer](b)) div sizeof(T)
-  {.pop.}
-  res
+  distance(cast[pointer](a), cast[pointer](b)) div sizeof(T)