...fo(CODESET) function returns the name of the selected encoding. Library functions such as wctomb (3) and mbsrtowcs (3) can be used to transform the internal wchar_t characters a…...s isupper (3) and toupper (3), and the multibyte character functions such as mblen (3) or wctomb (3). LC_IDENTIFICATION (GNU extension, since glibc 2.2) Change settings that rel…...tomb() if its final argument is NULL wcsrtombs() if its final argument is NULL wcstombs() wctomb() Async-cancel-safe functions An async-cancel-safe function is one that can be s…