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

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

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

       #include <wchar.h>

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

       If dest is not a NULL pointer, the mbsrtowcs() function converts 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 repeat-
       edly calling mbrtowc(dest, *src, n, ps) where n is some positive number, as long  as  this
       call succeeds, and then incrementing dest by one and *src by the number of bytes consumed.
       The conversion 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. 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 null wide
	  character ('\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 wide characters written to dest,
	  excluding the terminating null wide 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 memory, and that no length limit exists.

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

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

       The mbsrtowcs() 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


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

       Passing NULL as ps is not multithread safe.

       iconv(3), mbsnrtowcs(3), mbstowcs(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					    2011-09-28				     MBSRTOWCS(3)

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