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-'\" t
-.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" References consulted:
-.\"   GNU glibc-2 source code and manual
-.\"   Dinkumware C library reference http://www.dinkumware.com/
-.\"   OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
-.\"   ISO/IEC 9899:1999
-.\"
-.TH mblen 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-mblen \- determine number of bytes in next multibyte character
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.PP
-.BI "int mblen(const char " s [. n "], size_t " n );
-.fi
-.SH DESCRIPTION
-If
-.I s
-is not NULL, the
-.BR mblen ()
-function inspects at most
-.I n
-bytes of the multibyte string starting at
-.I s
-and extracts the
-next complete multibyte character.
-It uses a static anonymous shift state known only to the
-.BR mblen ()
-function.
-If the multibyte character is not the null wide
-character, it returns the number of bytes that were consumed from
-.IR s .
-If the multibyte character is the null wide character, it returns 0.
-.PP
-If the
-.I n
-bytes starting at
-.I s
-do not contain a complete multibyte
-character,
-.BR mblen ()
-returns \-1.
-This can happen even if
-.I n
-is greater than or equal to
-.IR MB_CUR_MAX ,
-if the multibyte string contains redundant shift sequences.
-.PP
-If the multibyte string starting at
-.I s
-contains an invalid multibyte
-sequence before the next complete character,
-.BR mblen ()
-also returns \-1.
-.PP
-If
-.I s
-is NULL, the
-.BR mblen ()
-function
-.\" The Dinkumware doc and the Single UNIX specification say this, but
-.\" glibc doesn't implement this.
-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.
-.SH RETURN VALUE
-The
-.BR mblen ()
-function returns the number of
-bytes parsed from the multibyte
-sequence starting at
-.IR 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.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR mblen ()
-T}	Thread safety	MT-Unsafe race
-.TE
-.hy
-.ad
-.sp 1
-.SH VERSIONS
-The function
-.BR mbrlen (3)
-provides a better interface to the same
-functionality.
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C99.
-.SH NOTES
-The behavior of
-.BR mblen ()
-depends on the
-.B LC_CTYPE
-category of the
-current locale.
-.SH SEE ALSO
-.BR mbrlen (3)