WCRTOMB(3) BSD Library Functions Manual WCRTOMB(3)
wcrtomb -- converts a wide character to a multibyte character (restartable)
Standard C Library (libc, -lc)
wcrtomb(char * restrict s, wchar_t wc, mbstate_t * restrict ps);
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 fol-
wcrtomb(buf, L'\0', ps);
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
positive The number of bytes (including any shift sequences) which are stored in the
(size_t)-1 wc is not a valid wide character. In this case, wcrtomb() also sets errno to
indicate the error.
wcrtomb() may cause an error in the following case:
[EILSEQ] wc is not a valid wide character.
[EINVAL] ps points to an invalid or uninitialized mbstate_t object.
The wcrtomb() function conforms to ISO/IEC 9899/AMD1:1995 (``ISO C90, Amendment 1''). The
restrict qualifier is added at ISO/IEC 9899:1999 (``ISO C99'').
BSD February 4, 2002 BSD