To find size of buffer
=> R0 = 2 (reason code)
R1 = 0 to return required size of buffer
R2 = 0
R3 = header size to add to buffer size
R4 = 0 (flags, all reserved)
<= R1,R3,R4 preserved
R2 = size of buffer + size in R3
To enumerate
=> R0 = 2 (reason code)
R1 = pointer to buffer
R2 = size of buffer
R3 = previous handle, 0 to start
R4 = 0 (flags, all reserved)
<= R1 = pointer to first free byte in buffer
R2 = free bytes in buffer
R3 = updated handle (0 means end)
R4 preserved
This SWI is used by the Printers application to list the fonts known by the current printer. If there is no current job it is added to a global list, else it is added to a local list for the current job. Each job's list is initialised as a copy of the global list when it is started.
PDriver_MiscOp list fonts block
Offset Contents
0 pointer to control terminated RISC OS font name
4 pointer to printer's native font name (control terminated)
8 printer code flags
The pointed-to strings will become invalid if the relevent font is deleted by a call to PDriver_MiscOp 1.
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