R0 = Pointer to pathname
Exit:
R0 = Pointer to leafname
Finds the last occurence of '.' in the string pointed to by
R0, and returns a pointer to the next character. eg. given
'scsi::HardDisc.$.first.second.last' it will return a pointer
to 'last'. This can be useful for both extracting the leaf
name, and for determining what directory the file is in (by
poking a zero to (R0-1) - eg. MOV R2,#0 STRB R2,[R0,#-1] ).
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