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mbrlen(3)


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  NULL,  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

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

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

CONFORMING TO

   POSIX.1-2001, POSIX.1-2008, 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 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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