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FreeBSD 11.0 - man page for c16rtomb (freebsd section 3)

WCRTOMB(3)						   BSD Library Functions Manual 						WCRTOMB(3)

wcrtomb, c16rtomb, c32rtomb -- convert a wide-character code to a character (restartable)
Standard C Library (libc, -lc)
#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);
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.
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 charac- ter code.
The wcrtomb(), c16rtomb() and c32rtomb() functions will fail if: [EILSEQ] An invalid wide character code was specified. [EINVAL] The conversion state is invalid.
mbrtowc(3), multibyte(3), setlocale(3), wctomb(3)
The wcrtomb(), c16rtomb() and c32rtomb() functions conform to ISO/IEC 9899:2011 (``ISO C11'').
May 21, 2013 BSD