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

NAME
       wcsrtombs - convert a wide-character string to a multibyte string

SYNOPSIS
       #include <wchar.h>

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

DESCRIPTION
       If dest is not NULL, the wcsrtombs() function converts the wide-charac‐
       ter string *src to a multibyte string starting at dest.	 At  most  len
       bytes  are  written to dest.  The shift state *ps is updated.  The con‐
       version is effectively performed by  repeatedly	calling	 wcrtomb(dest,
       *src, ps), as long as this call succeeds, and then incrementing dest by
       the number of bytes written and *src by one.  The conversion  can  stop
       for three reasons:

       1. A wide character has been encountered that can not be represented as
       a multibyte sequence (according to the current locale).	In this	 case,
       *src  is	 left  pointing	 to the invalid wide character, (size_t) -1 is
       returned, and errno is set to EILSEQ.

       2. The length limit forces a stop.  In this case, *src is left pointing
       to  the	next  wide  character to be converted, and the number of bytes
       written to dest is returned.

       3. The wide-character string has been completely	 converted,  including
       the  terminating null wide character (L'\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 bytes written to dest, excluding the termi‐
       nating null byte ('\0'), is returned.

       If dest is NULL, len is ignored, and the conversion proceeds as	above,
       except that the converted bytes are not written out to memory, and that
       no length limit exists.

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

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

RETURN VALUE
       The wcsrtombs() function returns the number of bytes that make  up  the
       converted  part	of  multibyte  sequence, not including the terminating
       null byte.  If a wide character was encountered which could not be con‐
       verted, (size_t) -1 is returned, and errno set to EILSEQ.

CONFORMING TO
       C99.

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

       Passing NULL as ps is not multithread safe.

SEE ALSO
       iconv(3), mbsinit(3), wcrtomb(3), wcsnrtombs(3), wcstombs(3)

COLOPHON
       This page is part of release 3.65 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				  2014-03-18			  WCSRTOMBS(3)
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