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MBLEN

Section: Linux Programmer's Manual (3)
Updated: 2015-03-02
Index Return to Main Contents
 

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 NULL, 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 known only 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 NULL, the mblen() function resets the shift state, known to only 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 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.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
mblen() Thread safetyMT-Unsafe race
 

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 3.81 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO
COLOPHON


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