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There's plenty places in frontend code that could benefit from a string buffer implementation. Some because it yields simpler and faster code, and some others because of the desire to share code between backend and frontend. While there is a string buffer implementation available to frontend code, libpq's PQExpBuffer, it is clunkier than stringinfo, it introduces a libpq dependency, doesn't allow for sharing between frontend and backend code, and has a higher API/ABI stability requirement due to being exposed via libpq. Therefore it seems best to just making StringInfo being usable by frontend code. There's not much to do for that, except for rewriting two subsequent elog/ereport calls into others types of error reporting, and deciding on a maximum string length. For the maximum string size I decided to privately define MaxAllocSize to the same value as used in the backend. It seems likely that we'll want to reconsider this for both backend and frontend code in the not too far away future. For now I've left stringinfo.h in lib/, rather than common/, to reduce the likelihood of unnecessary breakage. We could alternatively decide to provide a redirecting stringinfo.h in lib/, or just not provide compatibility. Author: Andres Freund Reviewed-By: Kyotaro Horiguchi, Daniel Gustafsson Discussion: https://postgr.es/m/20190920051857.2fhnvhvx4qdddviz@alap3.anarazel.de |
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README
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.