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1 office 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 #ifdef HAVE_CONFIG_H
32 #include <config.h>
33 #endif
34  
35 #include <tcpdump-stdinc.h>
36  
37 #include <string.h>
38  
39 #include "interface.h"
40  
41 /*
42 * Copy src to string dst of size siz. At most siz-1 characters
43 * will be copied. Always NUL terminates (unless siz == 0).
44 * Returns strlen(src); if retval >= siz, truncation occurred.
45 */
46 size_t
47 strlcpy(char *dst, const char *src, size_t siz)
48 {
49 register char *d = dst;
50 register const char *s = src;
51 register size_t n = siz;
52  
53 /* Copy as many bytes as will fit */
54 if (n != 0 && --n != 0) {
55 do {
56 if ((*d++ = *s++) == 0)
57 break;
58 } while (--n != 0);
59 }
60  
61 /* Not enough room in dst, add NUL and traverse rest of src */
62 if (n == 0) {
63 if (siz != 0)
64 *d = '\0'; /* NUL-terminate dst */
65 while (*s++)
66 ;
67 }
68  
69 return(s - src - 1); /* count does not include NUL */
70 }