1caaf71ebb358f811fe7602bbadb90b897e93eaf7Elliott Hughes/* $OpenBSD: strncmp.c,v 1.8 2014/06/10 04:17:37 deraadt Exp $ */ 2a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project 3a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project/* 4a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * Copyright (c) 1989 The Regents of the University of California. 5a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * All rights reserved. 6a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 7a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * Redistribution and use in source and binary forms, with or without 8a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * modification, are permitted provided that the following conditions 9a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * are met: 10a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 11a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * notice, this list of conditions and the following disclaimer. 12a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 13a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 14a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * documentation and/or other materials provided with the distribution. 15a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 3. Neither the name of the University nor the names of its contributors 16a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * may be used to endorse or promote products derived from this software 17a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * without specific prior written permission. 18a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 19a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * SUCH DAMAGE. 30a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project */ 31a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project 32a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project#include <string.h> 33a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project 34a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Projectint 35a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Projectstrncmp(const char *s1, const char *s2, size_t n) 36a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project{ 3753e43292aac91bf62995788cd5ca2ceb7caea283Elliott Hughes 38a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project if (n == 0) 39a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project return (0); 40a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project do { 41a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project if (*s1 != *s2++) 42a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project return (*(unsigned char *)s1 - *(unsigned char *)--s2); 43a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project if (*s1++ == 0) 4430a419afc3cdb641e350c7cfde753877675958e0André Goddard Rosa break; 45a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project } while (--n != 0); 46a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project return (0); 47a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project} 48