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


       #include <wchar.h>

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

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

           Since glibc 2.10:
               _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:


       The  wcsnrtombs()  function  is  like the wcsrtombs(3) function, except that the number of
       wide characters to be converted, starting at *src, is limited to nwc.

       If dest is not a NULL pointer,  the  wcsnrtombs()  function  converts  at  most  nwc  wide
       characters from 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.  nwc  wide  characters  have  been converted without encountering a null wide character
       (L'\0'), or 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 (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 destination length limit

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

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


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




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

       Passing NULL as ps is not multithread safe.


       iconv(3), wcsrtombs(3)


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