1 /* $NetBSD: strlcpy.c,v 1.5 1999/09/20 04:39:47 lukem Exp $ */ 2 /* from OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp */ 3 4 /* 5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef lint 32 static const char rcsid[] = 33 "@(#) $Header: /tcpdump/master/tcpdump/missing/strlcpy.c,v 1.1 2000/01/19 05:34:19 itojun Exp $ (LBL)"; 34 #endif 35 36 #include <config.h> 37 38 #include <sys/types.h> 39 #include <string.h> 40 41 #include "interface.h" 42 43 /* 44 * Copy src to string dst of size siz. At most siz-1 characters 45 * will be copied. Always NUL terminates (unless siz == 0). 46 * Returns strlen(src); if retval >= siz, truncation occurred. 47 */ 48 size_t 49 strlcpy(dst, src, siz) 50 char *dst; 51 const char *src; 52 size_t siz; 53 { 54 register char *d = dst; 55 register const char *s = src; 56 register size_t n = siz; 57 58 /* Copy as many bytes as will fit */ 59 if (n != 0 && --n != 0) { 60 do { 61 if ((*d++ = *s++) == 0) 62 break; 63 } while (--n != 0); 64 } 65 66 /* Not enough room in dst, add NUL and traverse rest of src */ 67 if (n == 0) { 68 if (siz != 0) 69 *d = '\0'; /* NUL-terminate dst */ 70 while (*s++) 71 ; 72 } 73 74 return(s - src - 1); /* count does not include NUL */ 75 } 76