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MBRLEN(3)		   Linux Programmer's Manual		     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	 char‐
       acter,  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 rec‐
       ognized.	 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  cur‐
       rent locale.

SEE ALSO
       mbrtowc(3)

COLOPHON
       This  page  is  part of release 4.14 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/.

GNU				  2015-08-08			     MBRLEN(3)
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