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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  Lā€™\0ā€™ (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 ā€™\0ā€™ byte,
       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


       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 EILSEQ.




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

       Passing NULL as ps is not multi-thread safe.


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


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