1df8bae1dSRodney W. Grimes /*- 2*51369649SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause 3*51369649SPedro F. Giffuni * 4df8bae1dSRodney W. Grimes * Copyright (c) 1990, 1993 5df8bae1dSRodney W. Grimes * The Regents of the University of California. All rights reserved. 6df8bae1dSRodney W. Grimes * 7df8bae1dSRodney W. Grimes * This code is derived from software contributed to Berkeley by 8df8bae1dSRodney W. Grimes * Chris Torek. 9df8bae1dSRodney W. Grimes * 10df8bae1dSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 11df8bae1dSRodney W. Grimes * modification, are permitted provided that the following conditions 12df8bae1dSRodney W. Grimes * are met: 13df8bae1dSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 14df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 15df8bae1dSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 16df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 17df8bae1dSRodney W. Grimes * documentation and/or other materials provided with the distribution. 18fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors 19df8bae1dSRodney W. Grimes * may be used to endorse or promote products derived from this software 20df8bae1dSRodney W. Grimes * without specific prior written permission. 21df8bae1dSRodney W. Grimes * 22df8bae1dSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23df8bae1dSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24df8bae1dSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25df8bae1dSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26df8bae1dSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27df8bae1dSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28df8bae1dSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29df8bae1dSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30df8bae1dSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31df8bae1dSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32df8bae1dSRodney W. Grimes * SUCH DAMAGE. 33df8bae1dSRodney W. Grimes */ 34df8bae1dSRodney W. Grimes 35ab0de15bSDavid E. O'Brien #include <sys/cdefs.h> 36ab0de15bSDavid E. O'Brien __FBSDID("$FreeBSD$"); 37ab0de15bSDavid E. O'Brien 38452bffb2SJohn Baldwin #include <sys/libkern.h> 39df8bae1dSRodney W. Grimes 40df8bae1dSRodney W. Grimes /* 41df8bae1dSRodney W. Grimes * Copy src to dst, truncating or null-padding to always copy n bytes. 42df8bae1dSRodney W. Grimes * Return dst. 43df8bae1dSRodney W. Grimes */ 44df8bae1dSRodney W. Grimes char * 4593eb73aaSJeffrey Hsu strncpy(char * __restrict dst, const char * __restrict src, size_t n) 46df8bae1dSRodney W. Grimes { 47df8bae1dSRodney W. Grimes if (n != 0) { 48484820d4SConrad Meyer char *d = dst; 49484820d4SConrad Meyer const char *s = src; 50df8bae1dSRodney W. Grimes 51df8bae1dSRodney W. Grimes do { 52df8bae1dSRodney W. Grimes if ((*d++ = *s++) == 0) { 53df8bae1dSRodney W. Grimes /* NUL pad the remaining n-1 bytes */ 54df8bae1dSRodney W. Grimes while (--n != 0) 55df8bae1dSRodney W. Grimes *d++ = 0; 56df8bae1dSRodney W. Grimes break; 57df8bae1dSRodney W. Grimes } 58df8bae1dSRodney W. Grimes } while (--n != 0); 59df8bae1dSRodney W. Grimes } 60df8bae1dSRodney W. Grimes return (dst); 61df8bae1dSRodney W. Grimes } 62