=> R1 = pointer to name, control terminated
<= R0 = SWI number
R1 = preserved
This call converts a SWI name string to a SWI number. An error is given if the SWI name is not recognized.
The conversion is as follows:
· A leading X is stripped. If present, it will cause &20000 to be added to the number returned (bit 17).
· System names are checked for. Note that the conversion of SWIs isn't very bidirectional: the name OS_WriteI+" " can be produced, but only OS_WriteI is recognised.
· Modules are scanned. If the module prefix matches the one given, and the suffix to the name is a number, then that number is added to the module's SWI 'chunk' base, and the sum returned. For example, Wimp_&23 returns &400E3, as the Wimp's chunk number is &400C0.
· If the suffix is a name, and this can be matched by the module, the appropriate number is returned. For example, Wimp_Poll returns &400C7.
See PRM 1, page 461.
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