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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 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	 writ‐
	  ten to dest, excluding the terminating L'\0' character, is returned.

       The programmer must ensure that there is room for at least n wide char‐
       acters 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 mem‐
       ory, 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 cur‐
       rent locale.

       The function mbsrtowcs(3) provides a better interface to the same func‐


       This page is part of release 3.22 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				  1999-07-25			   MBSTOWCS(3)

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