NAME

       mbrlen - determine number of bytes in next multibyte character

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <wchar.h>

       size_t mbrlen(const char s[restrict .n], size_t n,
                     mbstate_t *restrict 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 │
       └────────────────────────────────────────────────────────────┴───────────────┴───────────────────────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       POSIX.1-2001, C99.

NOTES

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

SEE ALSO

       mbrtowc(3)