/*	$OpenBSD: snprintf.c,v 1.16 2009/10/22 01:23:16 guenther Exp $ */

/*-

 * Copyright (c) 1990, 1993

 *	The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Chris Torek.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include <limits.h>

#include <stdio.h>

#include <string.h>

#include <stdarg.h>

#include "local.h"

#include "ust_snprintf.h"

#define DUMMY_LEN	1

int ust_safe_vsnprintf(char *str, size_t n, const char *fmt, va_list ap)

{

	int ret;

	char dummy[DUMMY_LEN];

	LTTNG_UST_LFILE f;

	struct __lttng_ust_sfileext fext;

	/* While snprintf(3) specifies size_t stdio uses an int internally */

	if (n > INT_MAX)

		n = INT_MAX;

	/* Stdio internals do not deal correctly with zero length buffer */

	if (n == 0) {

		str = dummy;

		n = DUMMY_LEN;

	}

	_FILEEXT_SETUP(&f, &fext);

	f._file = -1;

	f._flags = __SWR | __SSTR;

	f._bf._base = f._p = (unsigned char *)str;

	f._bf._size = f._w = n - 1;

	ret = ust_safe_vfprintf(&f, fmt, ap);

	*f._p = '\0';

	return (ret);

}

int ust_safe_snprintf(char *str, size_t n, const char *fmt, ...)

{

	va_list ap;

	int ret;

	va_start(ap, fmt);

	ret = ust_safe_vsnprintf(str, n, fmt, ap);

	va_end(ap);

	return ret;

}