1 /* $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 1998 Todd C. Miller <[email protected]>
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 1.5 2001/05/13 15:40:16 deraadt Exp $";
32 #endif /* LIBC_SCCS and not lint */
33
34 #include <sys/types.h>
35
36 #ifdef HAVE_CONFIG_H
37 #include "config.h"
38 #endif /* HAVE_CONFIG_H */
39
40 #ifndef HAVE_STRLCPY
41 #include "strlcpy-internal.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
_event_strlcpy(char * dst,const char * src,size_t siz)49 _event_strlcpy(char *dst, const char *src, size_t siz)
50 {
51 register char *d = dst;
52 register const char *s = src;
53 register size_t n = siz;
54
55 /* Copy as many bytes as will fit */
56 if (n != 0 && --n != 0) {
57 do {
58 if ((*d++ = *s++) == 0)
59 break;
60 } while (--n != 0);
61 }
62
63 /* Not enough room in dst, add NUL and traverse rest of src */
64 if (n == 0) {
65 if (siz != 0)
66 *d = '\0'; /* NUL-terminate dst */
67 while (*s++)
68 ;
69 }
70
71 return(s - src - 1); /* count does not include NUL */
72 }
73 #endif
74