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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").