Easy UTF16 string creation.

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Chewy509

Joined: 19 Jun 2003
Posts: 297
Location: Bris-vegas, Australia

Chewy509 02 Jan 2005, 12:19

Hi Everyone,

I've been converting some source code, so that all strings are native UTF-16. Since at the moment all strings are straight ASCII (the 7bit kind), conversion is relatively easy. However rather than doing thing by hand, which can be time consuming, I thought I might as well create a macro to do this...

Code:

macro utf16_pascal_str name, [string]
{
common 
  name:
   local label, label2
 db label-label2
     label:
forward
       dw string
common
 label2:
}

utf16_pascal_str my_string, 'H','e','l','l','o'

Generates the correct sequence, however instead of splitting up the string as above, I would just like to use : utf16_pascal_str my_string, 'Hello' to generate the correct sequence. So any hints would be appreciated.

The macro would be something like this:

Code:

macro utf16_pascal_str name, string
{
       name:
   local label, label2
 dw label-label2
     label:
  dw string
   label2:
}

which is simplier, however the dw string doesn't work, (which is expected as it was never implemented that way).

So how I do take a string as input, and then define a series of dw with each one being a single character?

02 Jan 2005, 12:19

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 02 Jan 2005, 13:12

Use "du" instead of "dw".

02 Jan 2005, 13:12

Chewy509

Joined: 19 Jun 2003
Posts: 297
Location: Bris-vegas, Australia

Chewy509 02 Jan 2005, 22:19

Thanks.

02 Jan 2005, 22:19

Chewy509

Joined: 19 Jun 2003
Posts: 297
Location: Bris-vegas, Australia

Chewy509 03 Jan 2005, 01:45

Here is the final version of the macro...

Code:

macro utf16_pascal_str name, [string]
{
common 
      name:
   local label, label2
 dw ( label - label2 ) / 2
   label:
  dw 0feffh ;This is the Unicode Byte Order Mark
forward
   du string
common
 label2:
}

Usage:

Code:

utf16_pascal_str string2, 02126h, ' This is the symbol for ohm'

will produce a correctly formatted UTF16 string. eg

Quote:

Ω This is the symbol for ohm

The NULL terminated version would be:

Code:

macro utf16_str name, [string]
{
common 
        name:
   dw 0feffh ;This is the Unicode Byte Order Mark
forward
   du string
common
 dw 0
}

Same usage applies.

Note: The Pascal version uses a word, instead of a byte for string length. Strings upto 64K characters are now possible (using upto 128K of memory).
Note2: The first word is the Unicode Byte Order Mark, to define the endian mode.

03 Jan 2005, 01:45

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