MBLEN(3)						     Linux Programmer's Manual							  MBLEN(3)

NAME

       mblen - determine number of bytes in next multibyte character

SYNOPSIS

       #include <stdlib.h>

       int mblen(const char *s, size_t n);

DESCRIPTION

       If  s is not a NULL pointer, the mblen() function inspects at most n bytes of the multibyte string starting at s and extracts the next com-
       plete multibyte character.  It uses a static anonymous shift state only known to the mblen() function.  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 returns 0.

       If the n bytes starting at s do not contain a complete multibyte character, mblen() returns -1.	This can happen even if n is greater  than
       or equal to 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, mblen() also returns -1.

       If s is a NULL pointer, the mblen() function resets the shift state, only known to this function, to the initial state, and returns nonzero
       if the encoding has nontrivial shift state, or zero if the encoding is stateless.

RETURN VALUE

       The mblen() function returns the number of bytes parsed from the multibyte sequence starting at s, if a non-null wide character was  recog-
       nized.	It  returns  0, if a null wide character was recognized.  It returns -1, if an invalid multibyte sequence was encountered or if it
       couldn't parse a complete multibyte character.

CONFORMING TO

       C99.

NOTES

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

       The function mbrlen(3) provides a better interface to the same functionality.

SEE ALSO

       mbrlen(3)

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    1999-07-25								  MBLEN(3)