1a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project/* $OpenBSD: strncpy.c,v 1.6 2005/08/08 08:05:37 espie Exp $ */ 2a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project 3a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project/*- 4a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * Copyright (c) 1990 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 * This code is derived from software contributed to Berkeley by 8a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * Chris Torek. 9a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 10a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * Redistribution and use in source and binary forms, with or without 11a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * modification, are permitted provided that the following conditions 12a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * are met: 13a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 14a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * notice, this list of conditions and the following disclaimer. 15a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 16a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 17a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * documentation and/or other materials provided with the distribution. 18a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 3. Neither the name of the University nor the names of its contributors 19a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * may be used to endorse or promote products derived from this software 20a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * without specific prior written permission. 21a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * 22a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * SUCH DAMAGE. 33a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project */ 34a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project 35a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project#if !defined(_KERNEL) && !defined(_STANDALONE) 36a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project#include <string.h> 37a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project#else 38a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project#include <lib/libkern/libkern.h> 39a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project#endif 40a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project 41a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project/* 42a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * Copy src to dst, truncating or null-padding to always copy n bytes. 43a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project * Return dst. 44a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project */ 45a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Projectchar * 46a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Projectstrncpy(char *dst, const char *src, size_t n) 47a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project{ 48a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project if (n != 0) { 49a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project char *d = dst; 50a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project const char *s = src; 51a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project 52a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project do { 53a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project if ((*d++ = *s++) == 0) { 54a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project /* NUL pad the remaining n-1 bytes */ 55a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project while (--n != 0) 56a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project *d++ = 0; 5730a419afc3cdb641e350c7cfde753877675958e0André Goddard Rosa break; 5830a419afc3cdb641e350c7cfde753877675958e0André Goddard Rosa } 59a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project } while (--n != 0); 60a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project } 61a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project return (dst); 62a27d2baa0c1a2ec70f47ea9199b1dd6762c8a34The Android Open Source Project} 63