toupper, tolower, toupper_l, …

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toupper(3)	referred by	duplocale(3) \| isalpha(3) \| locale(7) \| pslib(3) \| toascii(3) \| towlower(3) \| towupper(3) \| unicode::tolower(3) \| wctrans(3)
toupper(3)	refer to	attributes(7) \| duplocale(3) \| feature_test_macros(7) \| isalpha(3) \| locale(7) \| newlocale(3) \| setlocale(3) \| towlower(3) \| towupper(3) \| uselocale(3)