| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | NOTES | SEE ALSO | COLOPHON | The Linux Programming Interface |
MBLEN(3) Linux Programmer's Manual MBLEN(3)
mblen - determine number of bytes in next multibyte character
#include <stdlib.h>
int mblen(const char *s, size_t n);
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 complete 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.
The mblen() 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 -1, if an
invalid multibyte sequence was encountered or if it couldn't parse a complete
multibyte character.
C99.
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.
mbrlen(3)
This page is part of release 3.32 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)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface