=> R0 = 37 (Canonicalise path)
R1 = pointer to pathname to convert
R2 = pointer to buffer
R3 = pointer to name of path variable, or 0 for none
R4 = pointer to ctrl-terminated comma seperated path string, or 0 for none
R5 = buffer size
<= R5 = number of spare bytes in buffer (inc. term)
This call takes a filename (which may contain wildcards) and converts it into a complete pathname, including disc and directory name when not provided.
Example: fred may convert to SCSI::Gamma.$.Utils.Fred
Note: If you call once with R2 and R5 set to zero, R5 will minus the return the number of bytes needed. Now you can call again having allocated -R5 bytes from somewhere.
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