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3d94e07c49
Previously, fprintf() on a wide-oriented stream crashes or outputs garbage. This is because a narrow char string which can be odd bytes in length is cast into a wide char string which should be even bytes in length in __sprint_r/__sfputs_r based on the __SWID flag. As a result, if the length is odd bytes, the reading buffer runs over the buffer length, which causes a crash. If the length is even bytes, garbage is printed. With this patch, any output to the stream which is set to different orientation fails with error just like glibc. Note that it behaves differently from other libc implementations such as BSD, musl and Solaris. Reviewed-by: Corinna Vinschen <corinna@vinschen.de> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
117 lines
3.4 KiB
C
117 lines
3.4 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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<<ungetwc>>---push wide character data back into a stream
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INDEX
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ungetwc
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INDEX
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_ungetwc_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 ungetwc(wint_t <[wc]>, FILE *<[stream]>);
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wint_t _ungetwc_r(struct _reent *<[reent]>, wint_t <[wc]>, FILE *<[stream]>);
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DESCRIPTION
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<<ungetwc>> is used to return wide characters back to <[stream]> to be
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read again. If <[wc]> is WEOF, the stream is unchanged. Otherwise, the
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wide character <[wc]> is put back on the stream, and subsequent reads will see
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the wide chars pushed back in reverse order. Pushed wide chars are lost if the
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stream is repositioned, such as by <<fseek>>, <<fsetpos>>, or
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<<rewind>>.
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The underlying file is not changed, but it is possible to push back
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something different than what was originally read. Ungetting a
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character will clear the end-of-stream marker, and decrement the file
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position indicator. Pushing back beyond the beginning of a file gives
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unspecified behavior.
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The alternate function <<_ungetwc_r>> is a reentrant version. The
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extra argument <[reent]> is a pointer to a reentrancy structure.
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RETURNS
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The wide character pushed back, or <<WEOF>> on error.
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PORTABILITY
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C99
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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 <limits.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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_ungetwc_r (struct _reent *ptr,
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wint_t wc,
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register FILE *fp)
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{
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char buf[MB_LEN_MAX];
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size_t len;
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_newlib_flockfile_start (fp);
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if (ORIENT (fp, 1) != 1)
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wc = WEOF;
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else if (wc == WEOF)
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wc = WEOF;
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else if ((len = _wcrtomb_r(ptr, buf, wc, &fp->_mbstate)) == (size_t)-1)
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{
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fp->_flags |= __SERR;
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wc = WEOF;
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}
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else
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while (len-- != 0)
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if (_ungetc_r(ptr, (unsigned char)buf[len], fp) == EOF)
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{
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wc = WEOF;
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break;
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}
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_newlib_flockfile_end (fp);
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return wc;
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}
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/*
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* MT-safe version.
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*/
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wint_t
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ungetwc (wint_t wc,
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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 _ungetwc_r (reent, wc, fp);
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}
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