WCRTOMB(3)             FreeBSD Library Functions Manual             WCRTOMB(3)

NAME
     wcrtomb, c16rtomb, c32rtomb - 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 c, mbstate_t * restrict ps);

     #include <uchar.h>

     size_t
     c16rtomb(char * restrict s, char16_t c, mbstate_t * restrict ps);

     size_t
     c32rtomb(char * restrict s, char32_t c, mbstate_t * restrict ps);

DESCRIPTION
     The wcrtomb(), c16rtomb() and c32rtomb() functions store a multibyte
     sequence representing the wide character c, including any necessary shift
     sequences, to the character array s, storing a maximum of MB_CUR_MAX
     bytes.

     If s is NULL, these functions behave as if s pointed to an internal
     buffer and c was a null wide character (L'\0').

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

     As certain multibyte characters may only be represented by a series of
     16-bit characters, the c16rtomb() may need to invoked multiple times
     before a multibyte sequence is returned.

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

ERRORS
     The wcrtomb(), c16rtomb() and c32rtomb() functions 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)

STANDARDS
     The wcrtomb(), c16rtomb() and c32rtomb() functions conform to ISO/IEC
     9899:2011 ("ISO C11").

FreeBSD 13.1-RELEASE-p6          May 21, 2013          FreeBSD 13.1-RELEASE-p6