NAME

       mbrlen - determine number of bytes in next multibyte character

SYNOPSIS

       #include <wchar.h>

       size_t mbrlen(const char *s, size_t n, mbstate_t *ps);

DESCRIPTION

       The  mbrlen()  function  inspects  at most n bytes of the multibyte string starting at s and extracts the
       next complete multibyte character.  It updates the shift state *ps.  If the multibyte  character  is  not
       the  null  wide  character,  it  returns the number of bytes that were consumed from s.  If the multibyte
       character is the null wide character, it resets the shift state *ps to the initial state and returns 0.

       If the n bytes starting at s do not contain a complete multibyte character, mbrlen() returns (size_t) -2.
       This can happen even if n >= MB_CUR_MAX, if the multibyte string contains redundant shift sequences.

       If the multibyte string starting at s contains an invalid multibyte sequence  before  the  next  complete
       character,  mbrlen()  returns (size_t) -1 and sets errno to EILSEQ.  In this case, the effects on *ps are
       undefined.

       If ps is a NULL pointer, a static anonymous state known only to the mbrlen() function is used instead.

RETURN VALUE

       The mbrlen() function returns the number of bytes parsed from the multibyte sequence starting at s, if  a
       non-null  wide  character  was  recognized.   It  returns 0, if a null wide character was recognized.  It
       returns (size_t) -1 and sets errno to EILSEQ, if an  invalid  multibyte  sequence  was  encountered.   It
       returns  (size_t) -2  if  it  couldn't  parse  a  complete  multibyte character, meaning that n should be
       increased.

ATTRIBUTES

   Multithreading (see pthreads(7))
       The mbrlen() function is thread-safe with exceptions.  It is not thread-safe if called  with  a  NULL  ps
       parameter.

CONFORMING TO

       C99.

NOTES

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

SEE ALSO

       mbrtowc(3)

COLOPHON

       This  page  is  part  of  release 3.54 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                                                2013-06-21                                          MBRLEN(3)