=> R0 = pointer to string
R1 = pointer to buffer
R2 = length of buffer
<= R1 = 0 if integer returned, else preserved
R2 = integer if R1=0, else length of string
This SWI takes a string, evaluates it, and places result in given buffer. Type of the result is given in R1 :
0 Integer returned in R2
Not 0 Pointer to string, length in R2
See PRM 1, page 457.
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