wctomb - convert a wide character to a multibyte sequence
int wctomb(char *s, wchar_t wc);
If s is not NULL, the wctomb() function converts the wide
character wc to its multibyte representation and stores it at the
beginning of the character array pointed to by s. It updates the shift
state, which is stored in a static anonymous variable known only to the
wctomb() function, and returns the length of said multibyte
representation, that is, the number of bytes written at s.
The programmer must ensure that there is room for at least
MB_CUR_MAX bytes at s.
If s is NULL, the wctomb() function resets the shift
state, known only to this function, to the initial state, and returns
nonzero if the encoding has nontrivial shift state, or zero if the encoding
If s is not NULL, the wctomb() function returns the number of
bytes that have been written to the byte array at s. If wc can
not be represented as a multibyte sequence (according to the current locale),
-1 is returned.
If s is NULL, the wctomb() function returns nonzero
if the encoding has nontrivial shift state, or zero if the encoding is
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of wctomb() depends on the LC_CTYPE category of the
The function wcrtomb(3) provides a better interface to the
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