wcrtomb - convert a wide character to a multibyte sequence
The main case for this function is when
s is not NULL and
wc is not a null wide character (L'\0'). In this case, the wcrtomb() 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
*ps, and returns the length of said multibyte representation, that is, the number of bytes written at
A different case is when
s is not NULL, but
wc is a null wide character (L'\0'). In this case, the wcrtomb() function stores at the character array pointed to by
s the shift sequence needed to bring
*ps back to the initial state, followed by a '\0' byte. It updates the shift state
*ps (i.e., brings it into the initial state), and returns the length of the shift sequence plus one, that is, the number of bytes written at
A third case is when
s is NULL. In this case,
wc is ignored, and the function effectively returns
wcrtomb(buf, L'\0', ps)
buf is an internal anonymous buffer.
In all of the above cases, if
ps is NULL, a static anonymous state known only to the wcrtomb() function is used instead.
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of wcrtomb() depends on the LC_CTYPE category of the current locale.
Passing NULL as
ps is not multithread safe.
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