@@ -559,10 +559,16 @@ pg_wc_toupper(pg_wchar c)
559559case PG_REGEX_STRATEGY_BUILTIN :
560560return unicode_uppercase_simple (c );
561561case PG_REGEX_STRATEGY_LIBC_WIDE :
562+ /* force C behavior for ASCII characters, per comments above */
563+ if (pg_regex_locale -> is_default && c <= (pg_wchar )127 )
564+ return pg_ascii_toupper ((unsignedchar )c );
562565if (sizeof (wchar_t ) >=4 || c <= (pg_wchar )0xFFFF )
563566return towupper_l ((wint_t )c ,pg_regex_locale -> info .lt );
564567/* FALL THRU */
565568case PG_REGEX_STRATEGY_LIBC_1BYTE :
569+ /* force C behavior for ASCII characters, per comments above */
570+ if (pg_regex_locale -> is_default && c <= (pg_wchar )127 )
571+ return pg_ascii_toupper ((unsignedchar )c );
566572if (c <= (pg_wchar )UCHAR_MAX )
567573return toupper_l ((unsignedchar )c ,pg_regex_locale -> info .lt );
568574return c ;
@@ -587,10 +593,16 @@ pg_wc_tolower(pg_wchar c)
587593case PG_REGEX_STRATEGY_BUILTIN :
588594return unicode_lowercase_simple (c );
589595case PG_REGEX_STRATEGY_LIBC_WIDE :
596+ /* force C behavior for ASCII characters, per comments above */
597+ if (pg_regex_locale -> is_default && c <= (pg_wchar )127 )
598+ return pg_ascii_tolower ((unsignedchar )c );
590599if (sizeof (wchar_t ) >=4 || c <= (pg_wchar )0xFFFF )
591600return towlower_l ((wint_t )c ,pg_regex_locale -> info .lt );
592601/* FALL THRU */
593602case PG_REGEX_STRATEGY_LIBC_1BYTE :
603+ /* force C behavior for ASCII characters, per comments above */
604+ if (pg_regex_locale -> is_default && c <= (pg_wchar )127 )
605+ return pg_ascii_tolower ((unsignedchar )c );
594606if (c <= (pg_wchar )UCHAR_MAX )
595607return tolower_l ((unsignedchar )c ,pg_regex_locale -> info .lt );
596608return c ;