=> R1 = pointer to string
R2 = x offset in millipoints
R3 = y offset in millipoints
<= R1 = pointer to closest char
R2 = width of string
R3 = height of string
R4 = length of string
R5 = index of closest char
This SWI returns info about which char is closest to the given offset. To find this in a justified string, use Font_FindCaretJ.
In RISC OS 3 and later it is recommended to use Font_ScanString.
See PRM 3, page 444.
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