On 25.11.2015 14:10, Mikhail T. wrote: >> >> Two variables, LC_CTYPE and LC_COLLATE control this text processing >> behavior. The above is the correct lower case transliteration for >> Turkish. In German, the upper case correspondence of sharp-S ß is >> 'SS', but multi-char translation is not provided by the simple >> tolower/toupper functions. >> > 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. -mi