Extract variable string from a based DS using a pointer

[Dave Murvin <davem@xxxxxxxx>]

HI,

I trying to extract a variable string from a data structure like the following:

DTextDS          DS                  Based(TextPtr)
D TextLen                  1      2B 
0 

 *TEXTData                3      3

Note that TEXTData is not even defined at this point.

What I know is the value of the Text Pointer and the length of the text 
data (from TextLen).  I am having a hard time trying to figure out how to 
retrieve the text string from this structure into a variable character 
field that I can work with.  The TEXTData field should not even need to be 
defined in the DS as long as I know the address where it starts and how 
long it is.  Compiler did not like %Subst(TextDS : 3 : TextLen) because 3 
is larger than the defined DS.

I am just not seeing the solution to this.  I am trying to do this without 
having to specify a specific length to the TEXTData field or the DS.  I was 
thinking there must be some sort of C function that lets be extract from 
memory into a string, but I haven't found it yet.   Something like give me 
the string at TextPtr + 2 for TextLen positions.

Suggestions?

Thanks


Dave Murvin
DRM Enterprises, Inc.