95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/* $NetBSD: snprintf.c,v 1.22 2007/10/26 19:48:14 christos 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 <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: snprintf.c,v 1.22 2007/10/26 19:48:14 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <assert.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include "reentrant.h"
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#include "local.h"
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#if defined(_FORTIFY_SOURCE) && !defined(__lint__)
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#undef snprintf
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#define snprintf _snprintf
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#endif
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#ifdef __weak_alias
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__weak_alias(snprintf,_snprintf)
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#endif
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int
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snprintf(char *str, size_t n, char const *fmt, ...)
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{
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int ret;
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va_list ap;
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FILE f;
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struct __sfileext fext;
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unsigned char dummy[1];
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_DIAGASSERT(n == 0 || str != NULL);
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_DIAGASSERT(fmt != NULL);
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if ((int)n < 0) {
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errno = EINVAL;
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return (-1);
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}
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va_start(ap, fmt);
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_FILEEXT_SETUP(&f, &fext);
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f._file = -1;
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f._flags = __SWR | __SSTR;
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if (n == 0) {
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f._bf._base = f._p = dummy;
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f._bf._size = f._w = 0;
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} else {
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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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}
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ret = __vfprintf_unlocked(&f, fmt, ap);
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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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