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If s is a null pointer, the wcrtomb() function is equivalent to the call: wcrtomb(buf, L'\0', ps) where buf is an internal buffer.
If s is not a null pointer, the wcrtomb() function determines the number of bytes needed to represent the character that corresponds to the wide-character
given by wc (including any shift sequences), and stores the resulting bytes in the array whose first element is pointed to by s. At most MB_CUR_MAX bytes are stored. If wc is a null wide-character, a null byte is stored, preceded by any shift sequence needed to restore the initial shift state. The resulting
state described is the initial conversion state.
If ps is a null pointer, the wcrtomb() function uses its own internal mbstate_t object, which is initialized at program startup to the
initial conversion state. Otherwise, the mbstate_t object pointed to by ps is used to completely describe the current conversion state of the associated character
sequence. Solaris will behave as if no function defined in the Solaris Reference Manual calls wcrtomb().
The behavior of this function is affected by the LC_CTYPE category of the current locale. See environ(5).
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