=> R0 = pointer to name
R1 = pointer to value to set to
R2 = length, or -1 to delete
R3 = name pointer (0 for 1st call)
R4 = variable type
<= R3 = new name pointer
R4 = variable type
This SWI sets a variable's value to that specified, or deletes the variable. The name may be wildcarded for deletion and update (using '*' and '#'). Code variables will not be deleted unless R4 = 16. Literal strings do not need to be null terminated, as R2 is used for the length.
OS_ReadVarVal is marked as being re-entrant, which would allow it to re-enter the same code variable's read code. No note is made about this in the PRM and the code variable example in the PRM calls OS_Byte &87 which has undefined re-entrancy. D'oh.
See PRM 1, page 311.
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