size_t
wcrtomb(char * restrict s, wchar_t wc, mbstate_t * restrict ps)
)
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:
)
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.
)
just places
ps
into an initial state.
It is equivalent to the following call:
wcrtomb(buf, L'\0', ps);
Here,
buf
is a dummy buffer.
In this case,
wc
is ignored.
)
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.
)
returns:
wc
is not a valid wide character.
In this case,
wcrtomb()
also sets
errno
to indicate the error.
)
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.
)
function conforms to
ISO/IEC 9899/AMD1:1990 (``ISO C90'') .
The restrict qualifier is added at
ISO/IEC 9899:1999 (``ISO C99'') .