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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-
   character string *src to a multibyte string starting at dest.  At  most
   len  bytes  are  written to dest.  The shift state *ps is updated.  The
   conversion 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 terminating 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
   converted, (size_t) -1 is returned, and errno set to EILSEQ.

ATTRIBUTES

   For   an   explanation   of   the  terms  used  in  this  section,  see
   attributes(7).

   
   Interface    Attribute      Value                        
   
   wcsrtombs()  Thread safety  MT-Unsafe race:wcsrtombs/!ps

CONFORMING TO

   POSIX.1-2001, POSIX.1-2008, 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 4.09 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
   https://www.kernel.org/doc/man-pages/.



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