wcrtomb() converts the wide character given by
wc to the corresponding multibyte character, and stores it in the array pointed to by
s unless
s is a null pointer. This function will modify the first at most
MB_CUR_MAX bytes of the array pointed to by
s.
The behaviour of
wcrtomb() is affected by the
LC_CTYPE category of the current locale.
These are the special cases:
wc == 0
For state-dependent encodings, wcrtomb() stores a nul byte preceded by special byte sequence (if any) to return to an initial state in the array pointed to by s, and the state object pointed to by ps also returns to an initial state.
s == NULL
wcrtomb() just places
ps into an initial state. It is equivalent to the following call:
Here,
buf is a dummy buffer. In this case,
wc is ignored.
ps == NULL
mbrtowc() uses its own internal state object to keep the conversion state, instead of
ps mentioned in this manual page.
Calling any other functions in
Standard C Library (libc, -lc) never changes the internal state of
mbrtowc(), which is initialized at startup time of the program.