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Somebody had apparently once figured that casting to unsigned int would produce the right output for negative inputs, but that would only be true if 2^32 were a multiple of 7, which of course it ain't. We need to use a signed division and then correct the sign of the remainder. AFAICT, the only case where this would arise currently is when doing ISO-week calculations for dates in 4714BC, where we'd compute a negative Julian date representing 4714-01-04BC and then do some arithmetic with it. Since we don't even really document support for such dates, this is not of much consequence. But we may as well get it right. Per report from Vitaly Burovoy. |
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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/.