1 /* $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $ */
2
3 /*-
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <string.h>
31
32 /*
33 * Copy string src to buffer dst of size dsize. At most dsize-1
34 * chars will be copied. Always NUL terminates (unless dsize == 0).
35 * Returns strlen(src); if retval >= dsize, truncation occurred.
36 */
37 size_t
strlcpy(char * dst,const char * src,size_t dsize)38 strlcpy(char *dst, const char *src, size_t dsize)
39 {
40 const char *osrc = src;
41 size_t nleft = dsize;
42
43 /* Copy as many bytes as will fit. */
44 if (nleft != 0) {
45 while (--nleft != 0) {
46 if ((*dst++ = *src++) == '\0')
47 break;
48 }
49 }
50
51 /* Not enough room in dst, add NUL and traverse rest of src. */
52 if (nleft == 0) {
53 if (dsize != 0)
54 *dst = '\0'; /* NUL-terminate dst */
55 while (*src++)
56 ;
57 }
58
59 return(src - osrc - 1); /* count does not include NUL */
60 }
61
