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─────Run-Time Library───────────────────────────────────────────────────────
 
     The wctomb function converts its <wchar> argument to the
     corresponding multibyte character and stores the result at
     <mbchar>.
 
     The _fwctomb function is a model-independent (large-model) form of
     the wctomb function. It can be called from any point in any
     program.
 
     Return Value
 
     If either wctomb or _fwctomb converts the wide character to a
     multibyte character, it returns the number of bytes──which is
     never greater than MB_CUR_MAX──in the wide character. If <wchar>
     is the wide-character null character (L'\0'), wctomb returns 0.
     If the conversion is not possible in the current locale, wctomb
     returns -1.
                                    -♦-