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MBRLEN

Section: Linux Programmer's Manual (3)
Updated: 2015-08-08
Index Return to Main Contents
 

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 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).
InterfaceAttributeValue
mbrlen() Thread safetyMT-Unsafe race:mbrlen/!ps
 

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, C99.  

NOTES

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

SEE ALSO

mbrtowc(3)  

COLOPHON

This page is part of release 4.13 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 https://www.kernel.org/doc/man-pages/.


 

Index

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


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