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<== Date ==> <== Thread ==>

Subject: Re: Engineering Units
From: [email protected] (Tim Mooney)
To: [email protected], [email protected]
Date: Thu, 21 Sep 1995 13:45:52 -0500
re...
> ...problem with get_units.
> ...
> What we can do for now is to define a symbol MAX_UNITS_SIZE in dbDefs.h
> and change all record support modules and ascii files to use this symbol.
> Then when we go to next major EPICS release number we can just change
> MAX_UNITS_SIZE and have everything automatically support units strings
> of 16 characters.
> 
> Comments?

I think dbGet() should guarantee CA clients a null-terminated string by
writing a null into the last available element of the units-string
space.  If we do this, we don't need to patch any existing code (but
we do lose one character of units information).

Defining MAX_UNITS_SIZE, and patching what record-support code we can
find, will not guarantee a null-terminated string.  Eventually, some CA
client will crash in response to user input, after working fine for
months.

Tim Mooney


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