=> R0 = 54 (Read path of given directory)
R1 = pointer to buffer to hold pathname
R2 = directory to read
R3 = pointer to name of filing system
R5 = size of buffer (or 0 to read required size)
<= Buffer is filled with pathname
R1 = pointer to rest of path, or 0 if directory is not set
R5 = (buffer length) minus (length of string (with terminator))
R6 = pointer to special field, terminated with null or "," (or 0 for none)
This call reads the path of the specified directory.
Notes: Like other OS_FSControl calls, use this call twice: after the first call (r5 = 0), and on exit r5 = -(bytes needed).
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