SVNews r327453

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2017-12-31 22:43:24 - r327453 by ian (ian)

Complete list of files affected by revision r327453:

(Note: At the moment, these links point to ViewVC on svn.freebsd.org. They are probably slow. Do not overuse.)

History	Contents	Diff	MODIFY	`/head/stand/libsa/stand.h`
History	Contents	Diff	MODIFY	`/head/sys/sys/libkern.h`

Commit message:

Add a validbcd() routine that uses the bcd2bin_data[] array and returns a

bool indicating whether the input value represents a valid BCD byte.



The existing bcd2bin() routine will KASSERT if asked to convert a bad value,

but sometimes the kernel has to handle BCD data from untrusted sources, so

this will provide a mechanism to validate data before attempting conversion.



This would be have easier/cleaner if the bcd2bin_data[] array contained an

out-of-range value (such as 0xff) in the infill locations that aren't valid,

but it's a global symbol that might be referenced by out-of-tree code

relying on the current scheme, so I'm leaving that alone.

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