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On Windows, in UTF8 database encoding, what char2wchar() produces is UTF16 not UTF32, ie, characters above U+FFFF will be represented by surrogate pairs. t_isdigit() and siblings did not account for this and failed to provide a large enough result buffer. That in turn led to bogus "invalid multibyte character for locale" errors, because contrary to what you might think from char2wchar()'s documentation, its Windows code path doesn't cope sanely with buffer overflow. The solution for t_isdigit() and siblings is pretty clear: provide a 3-wchar_t result buffer not 2. char2wchar() also needs some work to provide more consistent, and more accurately documented, buffer overrun behavior. But that's a bigger job and it doesn't actually have any immediate payoff, so leave it for later. Per bug #15476 from Kenji Uno, who deserves credit for identifying the cause of the problem. Back-patch to all active branches. Discussion: https://postgr.es/m/15476-4314f480acf0f114@postgresql.org
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/.