=> R0 = SWI Number
R1 = pointer to buffer
R2 = buffer length
<= R0,R1 preserved
R2 = length of string in buffer
This call converts a SWI number to a string containing its SWI name. The returned string is null-terminated, and starts with an X if the SWI number has bit 17 set.
SWI numbers < &200 have an 'OS_' prefix to the main part, and a SWI-dependent end section (which is 'Undefined' for unknown OS SWIs).
SWI numbers in the range &100 to &1FF are converted in the form OS_WriteI+"A", or OS_WriteI+23 if the character is not a printable one.
SWI numbers >= &200 are looked for in modules. If a suitable name is found, it is given in the form module_name or module_number, eg. Wimp_Initialise, Wimp_32. If no name is found in the modules, the string 'User' is returned.
See PRM 1, page 459.
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