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194 lines
5.2 KiB
C
194 lines
5.2 KiB
C
/*-
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* Copyright (c) 2002-2004 Tim J. Robbins.
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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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/*
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FUNCTION
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<<fgetwc>>, <<getwc>>, <<fgetwc_unlocked>>, <<getwc_unlocked>>---get a wide character from a file or stream
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INDEX
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fgetwc
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INDEX
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fgetwc_unlocked
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INDEX
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_fgetwc_r
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INDEX
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_fgetwc_unlocked_r
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INDEX
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getwc
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INDEX
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getwc_unlocked
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INDEX
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_getwc_r
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INDEX
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_getwc_unlocked_r
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SYNOPSIS
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#include <stdio.h>
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#include <wchar.h>
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wint_t fgetwc(FILE *<[fp]>);
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <wchar.h>
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wint_t fgetwc_unlocked(FILE *<[fp]>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t _fgetwc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t _fgetwc_unlocked_r(struct _reent *<[ptr]>, FILE *<[fp]>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t getwc(FILE *<[fp]>);
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <wchar.h>
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wint_t getwc_unlocked(FILE *<[fp]>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t _getwc_r(struct _reent *<[ptr]>, FILE *<[fp]>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t _getwc_unlocked_r(struct _reent *<[ptr]>, FILE *<[fp]>);
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DESCRIPTION
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Use <<fgetwc>> to get the next wide character from the file or stream
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identified by <[fp]>. As a side effect, <<fgetwc>> advances the file's
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current position indicator.
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<<fgetwc_unlocked>> is a non-thread-safe version of <<fgetwc>>.
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<<fgetwc_unlocked>> may only safely be used within a scope
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protected by flockfile() (or ftrylockfile()) and funlockfile(). This
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function may safely be used in a multi-threaded program if and only
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if they are called while the invoking thread owns the (FILE *)
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object, as is the case after a successful call to the flockfile() or
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ftrylockfile() functions. If threads are disabled, then
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<<fgetwc_unlocked>> is equivalent to <<fgetwc>>.
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The <<getwc>> and <<getwc_unlocked>> functions or macros functions identically
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to <<fgetwc>> and <<fgetwc_unlocked>>. It may be implemented as a macro, and
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may evaluate its argument more than once. There is no reason ever to use it.
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<<_fgetwc_r>>, <<_getwc_r>>, <<_fgetwc_unlocked_r>>, and <<_getwc_unlocked_r>>
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are simply reentrant versions of the above functions that are passed the
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additional reentrant structure pointer argument: <[ptr]>.
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RETURNS
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The next wide character cast to <<wint_t>>, unless there is no more data,
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or the host system reports a read error; in either of these situations,
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<<fgetwc>> and <<getwc>> return <<WEOF>>.
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You can distinguish the two situations that cause an <<EOF>> result by
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using the <<ferror>> and <<feof>> functions.
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PORTABILITY
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<<fgetwc>> and <<getwc>> are required by C99 and POSIX.1-2001.
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<<fgetwc_unlocked>> and <<getwc_unlocked>> are GNU extensions.
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*/
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#include <_ansi.h>
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#include <reent.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include "local.h"
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wint_t
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__fgetwc (struct _reent *ptr,
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register FILE *fp)
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{
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wchar_t wc;
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size_t nconv;
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if (fp->_r <= 0 && __srefill_r (ptr, fp))
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return (WEOF);
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if (MB_CUR_MAX == 1)
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{
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/* Fast path for single-byte encodings. */
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wc = *fp->_p++;
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fp->_r--;
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return (wc);
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}
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do
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{
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nconv = _mbrtowc_r (ptr, &wc, (char *) fp->_p, fp->_r, &fp->_mbstate);
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if (nconv == (size_t)-1)
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break;
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else if (nconv == (size_t)-2)
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continue;
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else if (nconv == 0)
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{
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/*
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* Assume that the only valid representation of
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* the null wide character is a single null byte.
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*/
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fp->_p++;
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fp->_r--;
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return (L'\0');
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}
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else
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{
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fp->_p += nconv;
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fp->_r -= nconv;
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return (wc);
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}
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}
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while (__srefill_r(ptr, fp) == 0);
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fp->_flags |= __SERR;
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errno = EILSEQ;
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return (WEOF);
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}
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wint_t
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_fgetwc_r (struct _reent *ptr,
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register FILE *fp)
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{
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wint_t r;
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_newlib_flockfile_start (fp);
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ORIENT(fp, 1);
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r = __fgetwc (ptr, fp);
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_newlib_flockfile_end (fp);
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return r;
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}
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wint_t
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fgetwc (FILE *fp)
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{
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struct _reent *reent = _REENT;
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CHECK_INIT(reent, fp);
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return _fgetwc_r (reent, fp);
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}
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