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       wcsrtombs - convert a wide-character string to a multibyte string


       #include <wchar.h>

       size_t wcsrtombs(char *dest, const wchar_t **src,
                        size_t len, mbstate_t *ps);


       If dest is not a NULL pointer, the wcsrtombs() function converts the wide-character string
       *src to a multibyte string starting at dest.  At most len bytes are written to dest.   The
       shift state *ps is updated.  The conversion is effectively performed by repeatedly calling
       wcrtomb(dest, *src, ps), as long as this call succeeds, and then incrementing dest by  the
       number of bytes written and *src by one.  The conversion can stop for three reasons:

       1.  A  wide  character  has  been  encountered  that can not be represented as a multibyte
       sequence (according to the current locale).  In this case *src is  left  pointing  to  the
       invalid wide character, (size_t) -1 is returned, and errno is set to EILSEQ.

       2.  The  length  limit forces a stop.  In this case *src is left pointing to the next wide
       character to be converted, and the number of bytes written to dest is returned.

       3. The wide-character string has been completely converted, including the terminating null
       wide  character  (L'\0'),  which  has  the side effect of bringing back *ps to the initial
       state.  In this case *src is set to NULL,  and  the  number  of  bytes  written  to  dest,
       excluding the terminating null, is returned.

       If  dest  is  NULL,  len is ignored, and the conversion proceeds as above, except that the
       converted bytes are not written out to memory, and that no length limit exists.

       In both of the above cases, if ps is a NULL pointer, a static anonymous state  only  known
       to the wcsrtombs function is used instead.

       The programmer must ensure that there is room for at least len bytes at dest.


       The  wcsrtombs()  function  returns the number of bytes that make up the converted part of
       multibyte sequence, not including the terminating null byte.   If  a  wide  character  was
       encountered  which  could  not  be  converted,  (size_t) -1  is returned, and errno set to




       The behavior of wcsrtombs() depends on the LC_CTYPE category of the current locale.

       Passing NULL as ps is not multithread safe.


       iconv(3), wcsnrtombs(3), wcstombs(3)


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