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       mbstowcs - convert a multibyte string to a wide character string


       #include <stdlib.h>

       size_t mbstowcs (wchar_t *dest, const char *src, size_t n);


       If  dest  is  not  a  NULL  pointer, the mbstowcs function converts the
       multibyte string src to a wide-character string starting at  dest.   At
       most  n  wide  characters are written to dest. The conversion starts in
       the initial state. The conversion can stop for three reasons:

       1. An invalid multibyte sequence has been  encountered.  In  this  case
       (size_t)(-1) is returned.

       2.  n  non-L'\0' wide characters have been stored at dest. In this case
       the number of wide characters written to  dest  is  returned,  but  the
       shift state at this point is lost.

       3.  The  multibyte  string has been completely converted, including the
       terminating '\0'. In this case the number of wide characters written to
       dest, excluding the terminating L'\0' character, is returned.

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

       If dest is NULL, n 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 order to avoid the case 2 above, the programmer should make  sure  n
       is greater or equal to mbstowcs(NULL,src,0)+1.


       The  mbstowcs  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.


       ISO/ANSI C, UNIX98




       The behaviour of mbstowcs depends  on  the  LC_CTYPE  category  of  the
       current locale.

       The  function  mbsrtowcs  provides  a  better  interface  to  the  same