FreeBSD/Linux Kernel Cross Reference
sys/libkern/strlcpy.c
1 /* $OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 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 #if defined(LIBC_SCCS) && !defined(lint)
31 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: src/sys/libkern/strlcpy.c,v 1.8 2005/02/03 15:51:39 ru Exp $");
35
36 #include <sys/types.h>
37 #include <sys/libkern.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(dst, src, siz)
45 char *dst;
46 const char *src;
47 size_t siz;
48 {
49 char *d = dst;
50 const char *s = src;
51 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 }
71
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