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https://cygwin.com/pipermail/cygwin/2022-December/252571.html Cygwin's default locale is "C.UTF-8" as far as LC_CTYPE settings are concerned. However, while __global_locale contains fixed mbtowc and wctomb pointers, the lc_ctype_T pointer is still pointing to _C_ctype_locale, representing the standard "C" locale. The problem with this is that the codeset name as well as MB_CUR_MAX is wrong. Fix this by introducing a new lc_ctype_T structure called _C_utf8_ctype_locale, setting the default codeset to "UTF-8" and MB_CUR_MAX to 6. Use this as lc_ctype_T pointer in __global_locale by default on Cygwin. Fixes: a6a477fa8190 ("POSIX-1.2008 per-thread locales, groundwork part 1") Co-Authored-By: Takashi Yano <takashi.yano@nifty.ne.jp> Signed-off-by: Corinna Vinschen <corinna@vinschen.de>