f582340a6a
Fix the handle locking in stdio to use flockfile/funlockfile internally when and where required. Macros in <stdio.h> are updated to automatically call the underlying functions when the process is threaded to obtain the necessary locking. A private mutex is added to protect __sglue, the internal list of FILE handles, and another to protect the one-time initialization. Some routines in libc that use getc() change to use getc_unlocked() as they're either protected by their own lock or aren't thread-safe routines anyway. Based on OpenBSD change by guenther@openbsd.org http://www.mail-archive.com/source-changes@cvs.openbsd.org/msg01015.html Bug: 3446659 Change-Id: Ie82116e358c541718d6709ec45ca6796be5a007b
64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
/* $OpenBSD: vsnprintf.c,v 1.12 2006/01/06 18:53:04 millert Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include "local.h"
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int
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vsnprintf(char *str, size_t n, const char *fmt, __va_list ap)
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{
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int ret;
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char dummy;
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FILE f;
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struct __sfileext fext;
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_FILEEXT_SETUP(&f, &fext);
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/* While snprintf(3) specifies size_t stdio uses an int internally */
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if (n > INT_MAX)
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n = INT_MAX;
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/* Stdio internals do not deal correctly with zero length buffer */
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if (n == 0) {
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str = &dummy;
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n = 1;
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}
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f._file = -1;
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f._flags = __SWR | __SSTR;
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f._bf._base = f._p = (unsigned char *)str;
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f._bf._size = f._w = n - 1;
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ret = __vfprintf(&f, fmt, ap);
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*f._p = '\0';
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return (ret);
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}
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