1/* $NetBSD$ */ 2 3/* 4 * Copyright (c) 1997-2014 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Jan-Simon Pendry at Imperial College, London. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * 38 * File: am-utils/libamu/memcmp.c 39 * 40 */ 41 42#ifdef HAVE_CONFIG_H 43# include <config.h> 44#endif /* HAVE_CONFIG_H */ 45#include <am_defs.h> 46#include <amu.h> 47 48 49/* 50 * compare two strings for up to length "len". 51 * this will normally be included on systems that either have no memcmp() 52 * and no bcmp(), or on systems that have both but the memcmp() is not 8-bit 53 * clean (such as SunOS 4.1.3). 54 * 55 * SunOS 4.x with gcc requires prototype of (const voidp, const voidp, size_t) 56 */ 57int 58am_memcmp(const voidp s1, const voidp s2, size_t len) 59{ 60 unsigned char *ucp1 = (unsigned char *) s1; 61 unsigned char *ucp2 = (unsigned char *) s2; 62 int i = len; 63 64 while (i-- > 0) 65 if (*ucp1++ != *ucp2++) 66 return (ucp1[-1] >= ucp2[-1] ? 1 : -1); 67 68 return 0; 69} 70