1/* $NetBSD: strlcpy.c,v 1.1.1.5 2023/08/18 18:36:49 christos Exp $ */ 2 3/* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */ 4 5/* 6 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21/* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */ 22#include "file.h" 23#ifndef lint 24#if 0 25FILE_RCSID("@(#)$File: strlcpy.c,v 1.5 2022/09/24 20:30:13 christos Exp $") 26#else 27__RCSID("$NetBSD: strlcpy.c,v 1.1.1.5 2023/08/18 18:36:49 christos Exp $"); 28#endif 29#endif 30 31#include <sys/types.h> 32#include <string.h> 33 34/* 35 * Copy src to string dst of size siz. At most siz-1 characters 36 * will be copied. Always NUL terminates (unless siz == 0). 37 * Returns strlen(src); if retval >= siz, truncation occurred. 38 */ 39size_t 40strlcpy(char *dst, const char *src, size_t siz) 41{ 42 char *d = dst; 43 const char *s = src; 44 size_t n = siz; 45 46 /* Copy as many bytes as will fit */ 47 if (n != 0 && --n != 0) { 48 do { 49 if ((*d++ = *s++) == 0) 50 break; 51 } while (--n != 0); 52 } 53 54 /* Not enough room in dst, add NUL and traverse rest of src */ 55 if (n == 0) { 56 if (siz != 0) 57 *d = '\0'; /* NUL-terminate dst */ 58 while (*s++) 59 ; 60 } 61 62 return(s - src - 1); /* count does not include NUL */ 63} 64