2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
180 lines
4.7 KiB
Groff
180 lines
4.7 KiB
Groff
.\" $NetBSD: mblen.3,v 1.6 2006/10/14 07:51:01 wiz Exp $
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.\"
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.\" Copyright (c)2002 Citrus Project,
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd February 3, 2002
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.Dt MBLEN 3
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.Os
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.\" ----------------------------------------------------------------------
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.Sh NAME
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.Nm mblen
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.Nd get number of bytes in a multibyte character
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.\" ----------------------------------------------------------------------
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.Sh LIBRARY
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.Lb libc
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.\" ----------------------------------------------------------------------
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.Sh SYNOPSIS
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.In stdlib.h
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.Ft int
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.Fn mblen "const char *s" "size_t n"
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.\" ----------------------------------------------------------------------
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.Sh DESCRIPTION
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The
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.Fn mblen
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function usually determines the number of bytes in
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a multibyte character pointed to by
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.Fa s
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and returns it.
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This function shall only examine max n bytes of the array beginning from
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.Fa s .
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.Pp
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In state-dependent encodings,
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.Fa s
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may point the special sequence bytes to change the shift-state.
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Although such sequence bytes corresponds to no individual
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wide-character code,
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the
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.Fn mblen
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changes the own state by them and treats them
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as if they are a part of the subsequent multibyte character.
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.Pp
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Unlike
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.Xr mbrlen 3 ,
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the first
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.Fa n
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bytes pointed to by
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.Fa s
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need to form an entire multibyte character.
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Otherwise, this function causes an error.
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.Pp
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.Fn mblen
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is equivalent to the following call, except the internal state of the
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.Xr mbtowc 3
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function is not affected:
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.Bd -literal -offset indent
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mbtowc(NULL, s, n);
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.Ed
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.Pp
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Calling any other functions in
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.Lb libc
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never changes the internal
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state of
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.Fn mblen ,
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except for calling
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.Xr setlocale 3
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with the
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.Dv LC_CTYPE
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category changed to that of the current locale.
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Such
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.Xr setlocale 3
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calls cause the internal state of this function to be indeterminate.
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.Pp
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The behaviour of
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.Fn mblen
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is affected by the
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.Dv LC_CTYPE
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category of the current locale.
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.Pp
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These are the special cases:
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.Bl -tag -width 0123456789
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.It "s == NULL"
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.Fn mblen
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initializes its own internal state to an initial state, and
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determines whether the current encoding is state-dependent.
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This function returns 0 if the encoding is state-independent,
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otherwise non-zero.
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.It "n == 0"
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In this case,
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the first
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.Fa n
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bytes of the array pointed to by
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.Fa s
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never form a complete character.
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Thus,
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.Fn mblen
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always fails.
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.El
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.\" ----------------------------------------------------------------------
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.Sh RETURN VALUES
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Normally,
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.Fn mblen
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returns:
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.Bl -tag -width 0123456789
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.It "0"
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.Fa s
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points to a nul byte
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.Pq Sq \e0 .
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.It "positive"
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The value returned is
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a number of bytes for the valid multibyte character pointed to by
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.Fa s .
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There are no cases that this value is greater than
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.Fa n
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or the value of the
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.Dv MB_CUR_MAX
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macro.
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.It "-1"
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.Fa s
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points to an invalid or incomplete multibyte character.
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The
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.Fn mblen
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also sets
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.Va errno
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to indicate the error.
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.El
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.Pp
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When
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.Fa s
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is equal to
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.Dv NULL ,
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the
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.Fn mblen
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returns:
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.Bl -tag -width 0123456789
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.It "0"
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The current encoding is state-independent.
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.It "non-zero"
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The current encoding is state-dependent.
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.El
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.\" ----------------------------------------------------------------------
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.Sh ERRORS
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.Fn mblen
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may cause an error in the following case:
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.Bl -tag -width Er
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.It Bq Er EILSEQ
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.Fa s
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points to an invalid or incomplete multibyte character.
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.El
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.\" ----------------------------------------------------------------------
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.Sh SEE ALSO
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.Xr mbrlen 3 ,
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.Xr mbtowc 3 ,
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.Xr setlocale 3
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.\" ----------------------------------------------------------------------
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.Sh STANDARDS
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The
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.Fn mblen
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function conforms to
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.St -ansiC .
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