1 805e39bf 2021-07-22 op /*	$OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $	*/
 2 805e39bf 2021-07-22 op 
 3 805e39bf 2021-07-22 op /*
 4 805e39bf 2021-07-22 op  * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
 5 805e39bf 2021-07-22 op  *
 6 805e39bf 2021-07-22 op  * Permission to use, copy, modify, and distribute this software for any
 7 805e39bf 2021-07-22 op  * purpose with or without fee is hereby granted, provided that the above
 8 805e39bf 2021-07-22 op  * copyright notice and this permission notice appear in all copies.
 9 805e39bf 2021-07-22 op  *
10 805e39bf 2021-07-22 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 805e39bf 2021-07-22 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 805e39bf 2021-07-22 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 805e39bf 2021-07-22 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 805e39bf 2021-07-22 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 805e39bf 2021-07-22 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 805e39bf 2021-07-22 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 805e39bf 2021-07-22 op  */
18 805e39bf 2021-07-22 op 
19 805e39bf 2021-07-22 op #include <sys/types.h>
20 805e39bf 2021-07-22 op #include <string.h>
21 805e39bf 2021-07-22 op 
22 805e39bf 2021-07-22 op #include "compat.h"
23 805e39bf 2021-07-22 op 
24 805e39bf 2021-07-22 op /*
25 805e39bf 2021-07-22 op  * Copy string src to buffer dst of size dsize.  At most dsize-1
26 805e39bf 2021-07-22 op  * chars will be copied.  Always NUL terminates (unless dsize == 0).
27 805e39bf 2021-07-22 op  * Returns strlen(src); if retval >= dsize, truncation occurred.
28 805e39bf 2021-07-22 op  */
29 805e39bf 2021-07-22 op size_t
30 805e39bf 2021-07-22 op strlcpy(char *dst, const char *src, size_t dsize)
31 805e39bf 2021-07-22 op {
32 805e39bf 2021-07-22 op 	const char *osrc = src;
33 805e39bf 2021-07-22 op 	size_t nleft = dsize;
34 805e39bf 2021-07-22 op 
35 805e39bf 2021-07-22 op 	/* Copy as many bytes as will fit. */
36 805e39bf 2021-07-22 op 	if (nleft != 0) {
37 805e39bf 2021-07-22 op 		while (--nleft != 0) {
38 805e39bf 2021-07-22 op 			if ((*dst++ = *src++) == '\0')
39 805e39bf 2021-07-22 op 				break;
40 805e39bf 2021-07-22 op 		}
41 805e39bf 2021-07-22 op 	}
42 805e39bf 2021-07-22 op 
43 805e39bf 2021-07-22 op 	/* Not enough room in dst, add NUL and traverse rest of src. */
44 805e39bf 2021-07-22 op 	if (nleft == 0) {
45 805e39bf 2021-07-22 op 		if (dsize != 0)
46 805e39bf 2021-07-22 op 			*dst = '\0';		/* NUL-terminate dst */
47 805e39bf 2021-07-22 op 		while (*src++)
48 805e39bf 2021-07-22 op 			;
49 805e39bf 2021-07-22 op 	}
50 805e39bf 2021-07-22 op 
51 805e39bf 2021-07-22 op 	return(src - osrc - 1);	/* count does not include NUL */
52 805e39bf 2021-07-22 op }