1 /* $NetBSD: strlcpy.c,v 1.1.1.5 2023/08/18 18:36:49 christos Exp $ */
2
3 /* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */
4
5 /*
6 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21 /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */
22 #include "file.h"
23 #ifndef lint
24 #if 0
25 FILE_RCSID("@(#)$File: strlcpy.c,v 1.5 2022/09/24 20:30:13 christos Exp $")
26 #else
27 __RCSID("$NetBSD: strlcpy.c,v 1.1.1.5 2023/08/18 18:36:49 christos Exp $");
28 #endif
29 #endif
30
31 #include <sys/types.h>
32 #include <string.h>
33
34 /*
35 * Copy src to string dst of size siz. At most siz-1 characters
36 * will be copied. Always NUL terminates (unless siz == 0).
37 * Returns strlen(src); if retval >= siz, truncation occurred.
38 */
39 size_t
strlcpy(char * dst,const char * src,size_t siz)40 strlcpy(char *dst, const char *src, size_t siz)
41 {
42 char *d = dst;
43 const char *s = src;
44 size_t n = siz;
45
46 /* Copy as many bytes as will fit */
47 if (n != 0 && --n != 0) {
48 do {
49 if ((*d++ = *s++) == 0)
50 break;
51 } while (--n != 0);
52 }
53
54 /* Not enough room in dst, add NUL and traverse rest of src */
55 if (n == 0) {
56 if (siz != 0)
57 *d = '\0'; /* NUL-terminate dst */
58 while (*s++)
59 ;
60 }
61
62 return(s - src - 1); /* count does not include NUL */
63 }
64