> The report states about getChar, getLine, and getContents:
>
> "By default, these input functions echo to standard output."
>
> In version 1.3 of the report, it used to continue
> "Functions in the I/O library provide full control over echoing."
>
> Apparently, this has been removed and the I/O library contains
> neither facilities to control echoing nor a specification of what the
> h-cousins hGetChar, hGetLine, and hGetContents are supposed to do wrt
> echoing. Can I rely on them not to echo their inputs?
Clearly the report is vague here, so I'll just comment on what GHC does.
By default, input from a terminal will echo. The following functions
are provided by System.IO (GHC only, not Hugs or NHC), and control
terminal echoing:
hSetEcho :: Handle -> Bool -> IO ()
hGetEcho :: Handle -> IO Bool
Input from a non-terminal will not echo. GHC's IO library never does
any actual echoing itself, it simply gives hints to the OS's terminal
API to turn echoing on or off.
Cheers,
Simon
_______________________________________________
Haskell mailing list
[EMAIL PROTECTED]
http://www.haskell.org/mailman/listinfo/haskell
