WCRTOMB(3)                 Library Functions Manual                 WCRTOMB(3)

NAME
     wcrtomb, wcrtomb_l - convert a wide-character code to a character
     (restartable)

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <wchar.h>

     size_t
     wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict ps);

     #include <wchar.h>
     #include <xlocale.h>

     size_t
     wcrtomb_l(char *restrict s, wchar_t wc, mbstate_t *restrict ps,
         locale_t loc);

DESCRIPTION
     The wcrtomb() function stores a multibyte sequence representing the wide
     character wc, including any necessary shift sequences, to the character
     array s.  A maximum of MB_CUR_MAX bytes will be stored.

     If s is NULL, wcrtomb() behaves as if s pointed to an internal buffer and
     wc were a null wide character (L'\0').

     The mbstate_t argument, ps, is used to keep track of the shift state.  If
     it is NULL, wcrtomb() uses an internal, static mbstate_t object, which is
     initialized to the initial conversion state at program startup.

     While the wcrtomb() function uses the current locale, the wcrtomb_l()
     function may be passed a locale directly. See xlocale(3) for more
     information.

RETURN VALUES
     The wcrtomb() functions returns the length (in bytes) of the multibyte
     sequence needed to represent wc, or (size_t)-1 if wc is not a valid wide
     character code.

ERRORS
     The wcrtomb() function will fail if:

     [EILSEQ]           An invalid wide character code was specified.

     [EINVAL]           The conversion state is invalid.

SEE ALSO
     mbrtowc(3), multibyte(3), setlocale(3), wctomb(3), xlocale(3)

STANDARDS
     The wcrtomb() function conforms to ISO/IEC 9899:1999 ("ISO C99").

macOS 26.6                       April 8, 2004                      macOS 26.6