gistfile1.nim

func add*(s: var seq[byte], ss: openArray[char]) {.raises: [].} =
  if ss.len == 0: return
  let L = s.len
  when nimvm:
    s.setLen(L+ss.len)
    for i in 0 .. ss.len-1:
      s[L+i] = ss[i].byte
  else:
    #when defined(orc):
    #  s.setLenUninit(L+ss.len)
    #else:
    s.setLen(L+ss.len)
    moveMem(addr s[L], unsafeAddr ss[0], ss.len)

func add*(s: var string, ss: openArray[byte]) {.raises: [].} =
  if ss.len == 0: return
  let L = s.len
  when nimvm:
    s.setLen(L+ss.len)
    for i in 0 .. ss.len-1:
      s[L+i] = ss[i].char
  else:
    s.setLen(L+ss.len)
    prepareMutation(s)
    moveMem(addr s[L], unsafeAddr ss[0], ss.len)