| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 1 | /* $OpenBSD: strncpy.c,v 1.6 2005/08/08 08:05:37 espie Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1990 The Regents of the University of California. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to Berkeley by |
| 8 | * Chris Torek. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #if !defined(_KERNEL) && !defined(_STANDALONE) |
| 36 | #include <string.h> |
| 37 | #else |
| 38 | #include <lib/libkern/libkern.h> |
| 39 | #endif |
| 40 | |
| 41 | /* |
| 42 | * Copy src to dst, truncating or null-padding to always copy n bytes. |
| 43 | * Return dst. |
| 44 | */ |
| 45 | char * |
| 46 | strncpy(char *dst, const char *src, size_t n) |
| 47 | { |
| 48 | if (n != 0) { |
| 49 | char *d = dst; |
| 50 | const char *s = src; |
| 51 | |
| 52 | do { |
| 53 | if ((*d++ = *s++) == 0) { |
| 54 | /* NUL pad the remaining n-1 bytes */ |
| 55 | while (--n != 0) |
| 56 | *d++ = 0; |
| André Goddard Rosa | 30a419a | 2010-01-30 22:28:49 -0200 | [diff] [blame] | 57 | break; |
| 58 | } |
| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 59 | } while (--n != 0); |
| 60 | } |
| 61 | return (dst); |
| 62 | } |