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

       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 rea-

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

       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 null wide
	  character  ('\0').  In this case the number of wide characters written to dest, exclud-
	  ing the terminating null wide 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  con-
       verted 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.


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

       The function mbsrtowcs(3) provides a better interface to the same functionality.

       mbsrtowcs(3), wcstombs(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				      MBSTOWCS(3)
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