1/* $NetBSD: strlcpy.c,v 1.4 2005/05/16 06:58:06 lukem Exp $ */ 2/* from NetBSD: strlcpy.c,v 1.14 2003/10/27 00:12:42 lukem Exp */ 3/* from OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert 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 TODD C. MILLER DISCLAIMS ALL 13 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 14 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE 15 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 17 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 18 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21#include "tnftp.h" 22 23/* 24 * Copy src to string dst of size siz. At most siz-1 characters 25 * will be copied. Always NUL terminates (unless siz == 0). 26 * Returns strlen(src); if retval >= siz, truncation occurred. 27 */ 28size_t 29strlcpy(char *dst, const char *src, size_t siz) 30{ 31 char *d = dst; 32 const char *s = src; 33 size_t n = siz; 34 35 /* Copy as many bytes as will fit */ 36 if (n != 0 && --n != 0) { 37 do { 38 if ((*d++ = *s++) == 0) 39 break; 40 } while (--n != 0); 41 } 42 43 /* Not enough room in dst, add NUL and traverse rest of src */ 44 if (n == 0) { 45 if (siz != 0) 46 *d = '\0'; /* NUL-terminate dst */ 47 while (*s++) 48 ; 49 } 50 51 return(s - src - 1); /* count does not include NUL */ 52} 53