=> R0 = 12 (Read CSD and privilege byte)
13 (Read library and privilege byte)
R2 = buffer to write data to
R6 = 0, as special field not allowed here
This call should return the current directory name and privilege byte in this format - it is only called by RISC OS 2
Beware - the buffer pointed to will not have been validated with OS_ValidateAddress (as FileSwitch does not know how big it should be) - you should be prepared to cope with faulting if writing to invalid memory. If the memory is invalid you should look up the error token 'BadWrt'.
It is unclear how the calling program is to find out how long the buffer should be, short of ensuring that it is at the top of memory so that overruns will cause memory errors.
FSEntry_Func 12 / 13 buffer format
Size Value Value if CSD / Library unset
1 0 0
1 name length byte 5
n name (not terminated) "Unset"
1 privilege byte 0
The privilege byte is:
0 if you own the directory (and hence may create objects in it)
255 you do not own the directory (to you it is public)
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