recognizing asciiz, utf ...

Sergey Gromov snake.scaly at
Sat Mar 14 16:25:16 PDT 2009

Fri, 13 Mar 2009 15:04:12 -0400, newbee wrote:

> How does one check for asciiz, utf ...? 
> I do get a buffer with characters as parameter in a function, but i
> don’t know if it is asciiz or utf or wchar. Is it possible to find
> out in dmd1 and dmd2? 

There is some redundancy in UTF-8 format so you can test if your string
is a valid UTF-8 string.  There is std.utf.validate() for you.  Any
ASCII string will also pass since ASCII is a special case of UTF-8.

Not all code points are defined in Unicode.  This means you can cast
your string to wchar[] and then test every char using the
std.utf.isValidDchar() function.  If it fails, then you definitely not
dealing with a valid wchar[] string, so test dchar[] similarly.

Be prepared though that these tests will sometimes give you false

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