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Linux 2.6 - man page for wcsnrtombs (linux section 3)

WCSNRTOMBS(3)			    Linux Programmer's Manual			    WCSNRTOMBS(3)

       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 charac-
       ters  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  effec-
       tively  performed by repeatedly calling wcrtomb(dest, *src, ps), as long as this call suc-
       ceeds, 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

       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 byte ('\0'), 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 known only
       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 byte.  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)

       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

GNU					    2011-10-16				    WCSNRTOMBS(3)

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