mbrlen man page on CentOS

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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  a  NULL pointer, a static anonymous state only known 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.

CONFORMING TO
       C99

SEE ALSO
       mbrtowc(3)

NOTES
       The  behaviour of mbrlen() depends on the LC_CTYPE category of the cur‐
       rent locale.

GNU				  1999-07-25			     MBRLEN(3)
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