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 #include <config.h>
32
33 #include <netdissect-stdinc.h>
34
35 #include <string.h>
36
37 #include "netdissect.h"
38
39 /*
40 * Copy src to string dst of size siz. At most siz-1 characters
41 * will be copied. Always NUL terminates (unless siz == 0).
42 * Returns strlen(src); if retval >= siz, truncation occurred.
43 */
44 size_t
strlcpy(char * dst,const char * src,size_t siz)45 strlcpy(char *dst, const char *src, size_t siz)
46 {
47 char *d = dst;
48 const char *s = src;
49 size_t n = siz;
50
51 /* Copy as many bytes as will fit */
52 if (n != 0 && --n != 0) {
53 do {
54 if ((*d++ = *s++) == 0)
55 break;
56 } while (--n != 0);
57 }
58
59 /* Not enough room in dst, add NUL and traverse rest of src */
60 if (n == 0) {
61 if (siz != 0)
62 *d = '\0'; /* NUL-terminate dst */
63 while (*s++)
64 ;
65 }
66
67 return(s - src - 1); /* count does not include NUL */
68 }
69