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How to detect NULL in VarChar (C function) - Mailing list pgsql-interfaces

From Benno Pütz
Subject How to detect NULL in VarChar (C function)
Date
Msg-id 41E6A794.6020701@mpipsykl.mpg.de
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Responses Re: How to detect NULL in VarChar (C function)  (Michael Fuhr <mike@fuhr.org>)
Re: How to detect NULL in VarChar (C function)  (Tom Lane <tgl@sss.pgh.pa.us>)
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I try to write a function that combines two varchar columns.

Now the problem arose that (either) one of te columns may contain a NULL 
value, in which case the return value seems to become NULL.

I have not been able to find a description of how to detect NULL values 
in VarChar variables passed to C-functions to catch those cases.

Any help will be appreciated
   Benno

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