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
182 lines
4.8 KiB
Groff
182 lines
4.8 KiB
Groff
.\" $NetBSD: mbtowc.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 3, 2002
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.Dt MBTOWC 3
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.Os
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.\" ----------------------------------------------------------------------
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.Sh NAME
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.Nm mbtowc
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.Nd converts a multibyte character to a wide 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 mbtowc "wchar_t * restrict pwc" "const char * restrict s" "size_t n"
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.Sh DESCRIPTION
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.Fn mbtowc
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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 it in 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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This function may inspect at most 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 to the special sequence bytes to change the shift-state.
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Although such sequence bytes correspond to no individual
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wide-character code,
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.Fn mbtowc
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changes its own state by the sequence bytes and treats them
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as if they are a part of the subsequence multibyte character.
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.Pp
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Unlike
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.Xr mbrtowc 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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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 mbtowc ,
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except for calling
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.Xr setlocale 3
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with changing the
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.Dv LC_CTYPE
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category of the current locale.
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Such
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.Xr setlocale 3
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call causes 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 mbtowc
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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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There are special cases:
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.Bl -tag -width 012345678901
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.It s == NULL
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.Fn mbtowc
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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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In this case,
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.Fa pwc
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is completely ignored.
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.It pwc == NULL
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.Fn mbtowc
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executes the conversion as if
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.Fa pwc
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is non-NULL, but a result of the conversion is discarded.
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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, the
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.Fn mbtowc
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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, the
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.Fn mbtowc
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returns:
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.Bl -tag -width 012345678901
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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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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 the value returned is greater than
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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 an incomplete multibyte character.
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The
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.Fn mbtowc
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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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.Fn mbtowc
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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 mbtowc
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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 mblen 3 ,
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.Xr mbrtowc 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 mbtowc
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function conforms to
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.St -ansiC .
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The restrict qualifier is added at
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.St -isoC-99 .
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