MBSNRTOWCS(3)		   Linux Programmers Manual		MBSNRTOWCS(3)



NAME
       mbsnrtowcs - convert a multibyte string to a wide-character string

SYNOPSIS
       #define _GNU_SOURCE
       #include 

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

DESCRIPTION
       The  mbsnrtowcs()  function  is	like the mbsrtowcs(3) function, except
       that the number of bytes to be converted, starting at *src, is  limited
       to nms.

       If  dest  is  not a NULL pointer, the mbsnrtowcs() function converts at
       most nms bytes from the	multibyte  string  *src  to  a	wide-character
       string  starting  at  dest.  At most len wide characters are written to
       dest.  The shift state *ps is updated.  The conversion  is  effectively
       performed  by  repeatedly calling mbrtowc(dest, *src, n, ps) where n is
       some positive number, as long as this call succeeds,  and  then	incre
       menting dest by one and *src by the number of bytes consumed.  The con
       version can stop for three reasons:

       1. An invalid multibyte sequence has been encountered.	In  this  case
	  *src is left pointing to the invalid multibyte sequence, (size_t) -1
	  is returned, and errno is set to EILSEQ.

       2. The nms limit forces a stop, or len non-L'\0' wide  characters  have
	  been stored at dest.	In this case *src is left pointing to the next
	  multibyte sequence to be converted, and the number of  wide  charac
	  ters written to dest is returned.

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

       If  dest is NULL, len is ignored, and the conversion proceeds as above,
       except that the converted wide characters are not written out  to  mem
       ory, and that no destination length limit exists.

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

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

RETURN VALUE
       The  mbsnrtowcs()  function  returns the number of wide characters that
       make up the converted part of the wide-character string, not  including
       the  terminating null wide character.  If an invalid multibyte sequence
       was encountered, (size_t) -1 is returned, and errno set to EILSEQ.

CONFORMING TO
       This function is a GNU extension.

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

       Passing NULL as ps is not multi-thread safe.

SEE ALSO
       iconv(3), mbsrtowcs(3)

COLOPHON
       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



GNU				  2007-07-26			 MBSNRTOWCS(3)