strvalid.c revision 140960
1214501Srpaulo/*- 2214501Srpaulo * Copyright (c) 2002 Networks Associates Technology, Inc. 3214501Srpaulo * All rights reserved. 4214501Srpaulo * 5214501Srpaulo * This software was developed for the FreeBSD Project by NAI Labs, 6214501Srpaulo * the Security Research Division of Network Associates, Inc. under 7214501Srpaulo * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 8214501Srpaulo * CHATS research program. 9214501Srpaulo * 10214501Srpaulo * Redistribution and use in source and binary forms, with or without 11214501Srpaulo * modification, are permitted provided that the following conditions 12214501Srpaulo * are met: 13214501Srpaulo * 1. Redistributions of source code must retain the above copyright 14214501Srpaulo * notice, this list of conditions and the following disclaimer. 15214501Srpaulo * 2. Redistributions in binary form must reproduce the above copyright 16214501Srpaulo * notice, this list of conditions and the following disclaimer in the 17214501Srpaulo * documentation and/or other materials provided with the distribution. 18214501Srpaulo * 19214501Srpaulo * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20214501Srpaulo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21214501Srpaulo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22214501Srpaulo * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23214501Srpaulo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24214501Srpaulo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25214501Srpaulo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26214501Srpaulo * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27214501Srpaulo * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28214501Srpaulo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29214501Srpaulo * SUCH DAMAGE. 30214501Srpaulo */ 31214501Srpaulo 32214501Srpaulo#include <sys/cdefs.h> 33214501Srpaulo__FBSDID("$FreeBSD: head/sys/libkern/strvalid.c 140960 2005-01-29 13:34:22Z rwatson $"); 34214501Srpaulo 35214501Srpaulo#include <sys/types.h> 36214501Srpaulo#include <sys/libkern.h> 37214501Srpaulo 38214501Srpaulo/* 39214501Srpaulo * Return (1) if the buffer pointed to by kernel pointer 'buffer' and 40214501Srpaulo * of length 'bufferlen' contains a valid NUL-terminated string 41214501Srpaulo */ 42214501Srpauloint 43214501Srpaulostrvalid(const char *buffer, size_t bufferlen) 44214501Srpaulo{ 45214501Srpaulo size_t i; 46214501Srpaulo 47214501Srpaulo /* Must be NUL-terminated. */ 48214501Srpaulo for (i = 0; i < bufferlen; i++) 49214501Srpaulo if (buffer[i] == '\0') 50214501Srpaulo return (1); 51214501Srpaulo 52214501Srpaulo return (0); 53214501Srpaulo} 54214501Srpaulo