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On closer inspection, those seemingly redundant atoi() calls were not so much inefficient as just plain wrong: the author of this code either had not read, or had not understood, the POSIX specification for localeconv(). The grouping field is *not* a textual digit string but separate integers encoded as chars. We'll follow the existing code as well as the backend's cash.c in only honoring the first group width, but let's at least honor it correctly. This doesn't actually result in any behavioral change in any of the locales I have installed on my Linux box, which may explain why nobody's complained; grouping width 3 is close enough to universal that it's barely worth considering other cases. Still, wrong is wrong, so back-patch.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.