=> R0 = 15 (Read directory entries and information)
R1 = pointer to (wilcarded) directory name
R2 = pointer to buffer
R3 = number of objects to read
R4 = where to start, 0 for first time
R5 = length of buffer
R6 = pointer to special field, or 0 if not present
<= R3 = number of objects read
R4 = where to continue, or -1 for no more
This call should fill the buffer in R2 with entries in OS_GBPB 10 format.
Only count leaf names that will fit completely into the buffer. Return an error if the catalogued object is not found or a file, but return valid with R3=0, R4<>1 for buffer overflow or more names to read, R3=0,R4=-1 if the previous call didn't detect the end but you now find that there are no more names.
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