strvalid.c revision 90819
190819Srwatson/*- 290819Srwatson * Copyright (c) 2002 Networks Associates Technologies, Inc. 390819Srwatson * All rights reserved. 490819Srwatson * 590819Srwatson * This software was developed for the FreeBSD Project by NAI Labs, 690819Srwatson * the Security Research Division of Network Associates, Inc. under 790819Srwatson * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 890819Srwatson * CHATS research program. 990819Srwatson * 1090819Srwatson * Redistribution and use in source and binary forms, with or without 1190819Srwatson * modification, are permitted provided that the following conditions 1290819Srwatson * are met: 1390819Srwatson * 1. Redistributions of source code must retain the above copyright 1490819Srwatson * notice, this list of conditions and the following disclaimer. 1590819Srwatson * 2. Redistributions in binary form must reproduce the above copyright 1690819Srwatson * notice, this list of conditions and the following disclaimer in the 1790819Srwatson * documentation and/or other materials provided with the distribution. 1890819Srwatson * 3. The names of the authors may not be used to endorse or promote 1990819Srwatson * products derived from this software without specific prior written 2090819Srwatson * permission. 2190819Srwatson * 2290819Srwatson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2390819Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2490819Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2590819Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2690819Srwatson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2790819Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2890819Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2990819Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3090819Srwatson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3190819Srwatson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3290819Srwatson * SUCH DAMAGE. 3390819Srwatson * 3490819Srwatson * $FreeBSD: head/sys/libkern/strvalid.c 90819 2002-02-18 00:37:03Z rwatson $ 3590819Srwatson */ 3690819Srwatson 3790819Srwatson#include <sys/types.h> 3890819Srwatson#include <sys/libkern.h> 3990819Srwatson 4090819Srwatson/* 4190819Srwatson * Return (1) if the buffer pointed to by kernel pointer 'buffer' and 4290819Srwatson * of length 'bufferlen' contains a valid NUL-terminated string 4390819Srwatson */ 4490819Srwatsonint 4590819Srwatsonstrvalid(const char *buffer, size_t bufferlen) 4690819Srwatson{ 4790819Srwatson int i; 4890819Srwatson 4990819Srwatson /* Must be NUL-terminated. */ 5090819Srwatson for (i = 0; i < bufferlen; i++) 5190819Srwatson if (buffer[i] == '\0') 5290819Srwatson return (1); 5390819Srwatson 5490819Srwatson return (0); 5590819Srwatson} 56