advanced ASCII

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Mino

Joined: 14 Jan 2018
Posts: 163

Mino 04 Mar 2018, 21:04

Hello,
Does FASM allow advanced ASCII characters?
I tried this:

Code:

db "Chlo", 233, 0         ; "Chloé" is a French name

But I'm getting this:

Quote:

ChloÚ

A solution?
Thank you Smile

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04 Mar 2018, 21:04

Furs

Joined: 04 Mar 2016
Posts: 2542

Furs 04 Mar 2018, 22:12

Well this has nothing to do with FASM, but with the print output, which is probably a setting in the OS (locale or whatever).

(and no, I don't know how to do that on the OS, only used English Razz

)

04 Mar 2018, 22:12

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20409
Location: In your JS exploiting you and your system

revolution 04 Mar 2018, 22:49

Mino wrote:

Does FASM allow advanced ASCII characters?

Yes. All 8-bit values except the reserved control characters are valid for names and strings. So all UNICODE code points can safely be encoded and assembled if your editor supports them. The hard part is how to print them, and that depends on what you code, what OS you use and where you are outputting the characters.

04 Mar 2018, 22:49

Walter

Joined: 26 Jan 2013
Posts: 155

Walter 04 Mar 2018, 22:57

If you're using printf, try using 130 instead of 233.

Code:


format pe console
entry start

include '\Fasm\Include\win32a.inc'

section '.data' data readable writeable

    msg     db "Chlo",130,0,13,10
    format1 db '%s',0

section '.code' code readable executable

    start:

        cinvoke printf,format1,msg
        invoke  ExitProcess,0

section '.idata' import data readable writeable

    library kernel32,'kernel32.dll',\
            crtdll,'crtdll.dll'

    import kernel32,\
           ExitProcess,'ExitProcess'

    import crtdll,\
           printf,'printf'

04 Mar 2018, 22:57

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20409
Location: In your JS exploiting you and your system

revolution 04 Mar 2018, 23:03

The code page selected determines which characters are mapped in the range 0x80-0xff.

If your OS/system supports UNICODE then that might be the easiest and most compatible encoding to select. That way all applications and OS components will agree on what characters to draw.

04 Mar 2018, 23:03

alexfru

Joined: 23 Mar 2014
Posts: 80

alexfru 05 Mar 2018, 06:04

Walter wrote:

Actual interpretation of 8-bit character depends on the code page chosen in Windows. If I have the Russian code page, the characters will look different. One could chose the Unicode (UTF-8 ) page, but then non-ASCII chars will need several bytes per character and the cmd.exe window need to have a Unicode font selected (and unless anything has changed since Windows 7, a font can only be selected manually, oops).

05 Mar 2018, 06:04

Mino

Joined: 14 Jan 2018
Posts: 163

Mino 05 Mar 2018, 16:50

Thank you very much for your answers Smile

It works perfectly.
But, if I understood correctly, this technique (= mixing everything you've said) depends on the operating system; so if I'm on Windows, Mac or Linux, the result won't necessarily be the same?

05 Mar 2018, 16:50

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20409
Location: In your JS exploiting you and your system

revolution 05 Mar 2018, 22:34

Mino wrote:

But, if I understood correctly, this technique (= mixing everything you've said) depends on the operating system; so if I'm on Windows, Mac or Linux, the result won't necessarily be the same?

Not just the OS, but the code page selection.

You will find UNICODE to be the most compatible across all OSes and programs. And specifically the UTF8 encoding of UNICODE. Everything else with code pages and only 256 characters is going to cause problems.

05 Mar 2018, 22:34

Mino

Joined: 14 Jan 2018
Posts: 163

Mino 06 Mar 2018, 15:27

Ok, thank you very much for yours answers Smile

06 Mar 2018, 15:27

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