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

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

       #include <wchar.h>

       size_t mbsnrtowcs(wchar_t *dest, const char **src,
                         size_t nms, 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  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 NULL, the mbsnrtowcs() function converts at most nms bytes from the  multi‐
       byte 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  per‐
       formed  by  repeatedly 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 point‐
          ing to the invalid multibyte sequence, (size_t) -1 is returned, and  errno  is  set  to

       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 characters 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 destination length
       limit exists.

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

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

       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


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

       Passing NULL as ps is not multithread safe.

       iconv(3), mbrtowc(3) mbsinit(3), mbsrtowcs(3)

       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.

GNU                                         2014-03-18                              MBSNRTOWCS(3)

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