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