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
196 lines
5.4 KiB
Groff
196 lines
5.4 KiB
Groff
.\" $NetBSD: mbrtowc.3,v 1.8 2006/10/16 09:10:29 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 4, 2002
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.Dt MBRTOWC 3
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.Os
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.\" ----------------------------------------------------------------------
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.Sh NAME
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.Nm mbrtowc
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.Nd converts a multibyte character to a wide character (restartable)
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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 wchar.h
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.Ft size_t
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.Fn mbrtowc "wchar_t * restrict pwc" "const char * restrict s" "size_t n" \
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"mbstate_t * restrict ps"
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.\" ----------------------------------------------------------------------
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.Sh DESCRIPTION
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The
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.Fn mbrtowc
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usually converts the multibyte character pointed to by
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.Fa s
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to a wide character, and stores the wide character
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to the wchar_t object pointed to by
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.Fa pwc
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if
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.Fa pwc
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is
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.Pf non- Dv NULL
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and
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.Fa s
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points to a valid character.
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The conversion happens in accordance with, and changes the conversion
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state described in the mbstate_t object pointed to by
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.Fa ps .
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This function may examine at most
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.Fa n
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bytes of the array beginning from
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.Fa s .
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.Pp
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If
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.Fa s
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points to a valid character and the character corresponds to a nul wide
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character, then the
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.Fn mbrtowc
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places the mbstate_t object pointed to by
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.Fa ps
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to an initial conversion state.
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.Pp
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Unlike
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.Xr mbtowc 3 ,
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the
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.Fn mbrtowc
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may accept the byte sequence pointed to by
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.Fa s
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not forming a complete multibyte character
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but which may be part of a valid character.
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In this case, this function will accept all such bytes
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and save them into the conversion state object pointed to by
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.Fa ps .
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They will be used at subsequent calls of this function to restart
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the conversion suspended.
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.Pp
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The behaviour of
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.Fn mbrtowc
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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 012345678901
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.It "s == NULL"
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.Fn mbrtowc
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sets the conversion state object pointed to by
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.Fa ps
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to an initial state and always returns 0.
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Unlike
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.Xr mbtowc 3 ,
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the value returned does not indicate whether the current encoding of
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the locale is state-dependent.
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.Pp
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In this case,
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.Fn mbrtowc
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ignores
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.Fa pwc
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and
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.Fa n ,
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and is equivalent to the following call:
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.Bd -literal -offset indent
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mbrtowc(NULL, "", 1, ps);
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.Ed
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.It "pwc == NULL"
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The conversion from a multibyte character to a wide character has
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taken place and the conversion state may be affected, but the resulting
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wide character is discarded.
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.It "ps == NULL"
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.Fn mbrtowc
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uses its own internal state object to keep the conversion state,
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instead of
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.Fa ps
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mentioned in this manual page.
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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 state of
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.Fn mbrtowc ,
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which is initialized at startup time of the program.
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.El
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.\" ----------------------------------------------------------------------
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.Sh RETURN VALUES
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In the usual cases,
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.Fn mbrtowc
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returns:
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.Bl -tag -width 012345678901
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.It 0
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The next bytes pointed to by
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.Fa s
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form a nul character.
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.It positive
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If
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.Fa s
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points to a valid character,
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.Fn mbrtowc
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returns the number of bytes in the character.
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.It (size_t)-2
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.Fa s
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points to a byte sequence which possibly contains part of a valid
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multibyte character, but which is incomplete.
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When
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.Fa n
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is at least
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.Dv MB_CUR_MAX ,
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this case can only occur if the array pointed to by
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.Fa s
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contains a redundant shift sequence.
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.It (size_t)-1
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.Fa s
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points to an illegal byte sequence which does not form a valid multibyte
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character.
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In this case,
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.Fn mbrtowc
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sets
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.Va errno
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to indicate the error.
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.El
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.\" ----------------------------------------------------------------------
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.Sh ERRORS
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.Fn mbrtowc
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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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.It Bq Er EINVAL
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.Fa ps
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points to an invalid or uninitialized mbstate_t object.
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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 mbrtowc
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function conforms to
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.St -isoC-amd1 .
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The restrict qualifier is added at
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.St -isoC-99 .
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