PQescapeString handling of \0 - Mailing list pgsql-interfaces

Hi.

Here's a patch which makes PQescapeString stop escaping when \0 is seen.
Currently. if somebody passes a string with embedded \0 (for example, perl 
allows \0s in it's scalars and DBD::Pg does no checks), PQescapeString will 
return an invalid (bigger) length for \0-terminated string.

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Best regards,
Igor Shevchenko