On Nov 25, 2015 4:19 PM, "Mikhail T." <mi+t...@aldan.algebra.com> wrote: > > >> >> So, the concern is, some hypothetical header, such as X-ASSIGN-TO may, after going through the locale-aware strtolower() unexpectedly become x-aßign-to? > > I just tested the above on both FreeBSD and Linux, and the results are encouraging: >> >> % echo STRASSE | env LANG=de_DE.ISO8859 tr '[[:upper:]]' '[[:lower:]]' >> strasse > > Thus, I contend, using C-library will not cause invalid results, and the only reason to have Apache's own implementation is performance, but not correctness.
Well almost but wrong... The pure char-based ß processing produced no case change in my reviews of tolower/toupper in de_DE codeset. If you were to examine string comparison the collation order changes substantially. That said, I'm working up a comprehensive audit and other codeset/language combinations absolutely do. Code and results forthcoming shortly. As long as everyone keeps their fingers off the setlocale()/trigger, it's all fine.
