666d00d34a
(i.e., the return value would overflow), set errno to EOVERFLOW and return an error. This improves the chances that buggy applications -- for instance, ones that pass in a negative integer as the size due to a bogus calculation -- will fail in safe ways. Returning an error in these situations is specified by POSIX, but POSIX appears to have an off-by-one error that isn't duplicated in this change. Previously, some of these functions would silently cap the size at INT_MAX+1, and others would exit with an error after writing more than INT_MAX characters. PR: 39256 MFC after: 2 weeks
106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*-
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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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* Copyright (c) 2011 The FreeBSD Foundation
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* All rights reserved.
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* Portions of this software were developed by David Chisnall
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* under sponsorship from the FreeBSD Foundation.
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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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* 4. 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <stdarg.h>
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#include "xlocale_private.h"
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#include "local.h"
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int
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snprintf(char * __restrict str, size_t n, char const * __restrict fmt, ...)
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{
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size_t on;
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int ret;
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va_list ap;
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FILE f = FAKE_FILE;
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on = n;
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if (n != 0)
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n--;
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if (n > INT_MAX) {
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errno = EOVERFLOW;
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*str = '\0';
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return (EOF);
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}
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va_start(ap, fmt);
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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;
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ret = __vfprintf(&f, __get_locale(), fmt, ap);
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if (on > 0)
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*f._p = '\0';
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va_end(ap);
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return (ret);
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}
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int
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snprintf_l(char * __restrict str, size_t n, locale_t locale,
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char const * __restrict fmt, ...)
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{
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size_t on;
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int ret;
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va_list ap;
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FILE f = FAKE_FILE;
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FIX_LOCALE(locale);
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on = n;
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if (n != 0)
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n--;
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if (n > INT_MAX) {
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errno = EOVERFLOW;
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*str = '\0';
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return (EOF);
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}
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va_start(ap, fmt);
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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;
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ret = __vfprintf(&f, locale, fmt, ap);
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if (on > 0)
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*f._p = '\0';
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va_end(ap);
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return (ret);
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}
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