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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 mbrlen 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-mbrlen \- determine number of bytes in next multibyte character
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <wchar.h>
-.PP
-.BI "size_t mbrlen(const char " s "[restrict ." n "], size_t " n ,
-.BI "              mbstate_t *restrict " ps );
-.fi
-.SH DESCRIPTION
-The
-.BR mbrlen ()
-function inspects at most
-.I n
-bytes of the multibyte
-string starting at
-.I s
-and extracts the next complete multibyte character.
-It updates the shift state
-.IR *ps .
-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 resets the
-shift state
-.I *ps
-to the initial state and returns 0.
-.PP
-If the
-.I n
-bytes starting at
-.I s
-do not contain a complete multibyte
-character,
-.BR mbrlen ()
-returns
-.IR "(size_t)\ \-2" .
-This can happen even if
-.I n
->=
-.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 mbrlen ()
-returns
-.I (size_t)\ \-1
-and sets
-.I errno
-to
-.BR EILSEQ .
-In this case,
-the effects on
-.I *ps
-are undefined.
-.PP
-If
-.I ps
-is NULL, a static anonymous state known only to the
-.BR mbrlen ()
-function is used instead.
-.SH RETURN VALUE
-The
-.BR mbrlen ()
-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
-.I "(size_t)\ \-1"
-and sets
-.I errno
-to
-.BR EILSEQ ,
-if an invalid multibyte sequence was
-encountered.
-It returns
-.I (size_t)\ \-2
-if it couldn't parse a complete multibyte
-character, meaning that
-.I n
-should be increased.
-.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 mbrlen ()
-T}	Thread safety	MT-Unsafe race:mbrlen/!ps
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C99.
-.SH NOTES
-The behavior of
-.BR mbrlen ()
-depends on the
-.B LC_CTYPE
-category of the
-current locale.
-.SH SEE ALSO
-.BR mbrtowc (3)