Service_International 8 (changes)
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Programmer's Reference Manuals
» Part 16 – Service Calls
» Service_International
» Service_International 8
Service_International 8
(Service &43)
| Entry | |
|---|---|
| R1 | 67 (&43) |
| R2 | 8 |
| R3 | Alphabet number |
| Exit | |
|---|---|
| R1 | 0 to claim service, else preserved |
| R2 | Preserved |
| R3 | Preserved |
| R4 | Pointer to table if recognised, else preserved |
Use
This service returns an UCS conversion table for a given alphabet number.
Notes
Any module providing additional alphabets should check to see if it can provide a conversion table for the given alphabet number. If it can, it should claim the service and return a pointer to the table in R4, otherwise return with all register preserved.
The table has 256 32-bit entries, one for each character, giving the equivalent UCS code. If a character is not defined in the alphabet, its entry should contain &FFFFFFFF (not a valid UCS character).
Characters 0-31 and 127 are control codes in RISC OS – their entries in the tables of all alphabets should be 0-31 and 127 to guarantee a sensible translation to UTF8.
It is nonsensical to issue this service call for alphabet UTF8 (111). No module should claim such a call.
See also
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