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    Command:

    mbrlen

    
    
    

    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

       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 cur-
           rent locale.
    
    
    

    SEE ALSO

           mbrtowc(3)
    
    
    

    GNU 2013-06-21 MBRLEN(3)

    
    
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