Revise paste unicoder.vbs

'Unicoder v1.0.1, 2025-10-26.
'https://www.reddit.com/user/jcunews1
'https://pastebin.com/u/jcunews
'https://greasyfork.org/en/users/85671-jcunews
'
'Convert text with source character set to Unicode.
'A tool to help displaying CJK text when system codepage is not set to CJK.
'For use in console only.

sub help
  wsh.stdout.writeline "Usage: unicoder [/u] {charset} [input file]" _
    & vbcrlf & "If not input file is specified, use standard input." _
    & vbcrlf & "Use /u switch for UTF-8 output (for redirected output)."
  wsh.quit 1
end sub

if wsh.arguments.unnamed.count = 0 then help
set ds = createobject("adodb.stream") : ds.open
on error resume next
cs = wsh.arguments.unnamed(0)
ds.charset = cs
if err.number <> 0 then
  wsh.stdout.writeline "Invalid charset."
  wsh.quit 2
end if
on error goto 0
if wsh.arguments.unnamed.count >= 2 then
  ds.loadfromfile wsh.arguments.unnamed(1)
  ds.position = 0
  s = ""
  do while not ds.eos
    s = s & ds.readtext(1)
  loop
  wsh.stdout.write s
  wsh.quit
else
  ds.charset = "x-user-defined"
  ds.writetext wsh.stdin.readall
  ds.position = 0
  ds.charset = cs
end if
s = ""
do while not ds.eos
  s = s & ds.readtext(1)
loop
if wsh.arguments.named.exists("u") then
  set d = createobject("htmlfile")
  d.open
  d.write "<meta charset=utf-8><body><script id=z type=z>" & s & _
    "</script><script language=jscript>" & _
    "document.s=unescape(encodeURI(z.text))</script>"
  d.close
  s = d.s
  on error resume next
  for i = 1 to len(s)
    c = mid(s, i, 1)
    err.number = 0
    wsh.stdout.write c
    if err.number <> 0 then wsh.stdout.write chr(ascw(c))
  next
else
  wsh.stdout.write s
end if