1 0d6fb46a 2022-01-09 op /*	$OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $	*/
 2 0d6fb46a 2022-01-09 op 
 3 0d6fb46a 2022-01-09 op /*
 4 0d6fb46a 2022-01-09 op  * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
 5 0d6fb46a 2022-01-09 op  *
 6 0d6fb46a 2022-01-09 op  * Permission to use, copy, modify, and distribute this software for any
 7 0d6fb46a 2022-01-09 op  * purpose with or without fee is hereby granted, provided that the above
 8 0d6fb46a 2022-01-09 op  * copyright notice and this permission notice appear in all copies.
 9 0d6fb46a 2022-01-09 op  *
10 0d6fb46a 2022-01-09 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 0d6fb46a 2022-01-09 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 0d6fb46a 2022-01-09 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 0d6fb46a 2022-01-09 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 0d6fb46a 2022-01-09 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 0d6fb46a 2022-01-09 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 0d6fb46a 2022-01-09 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 0d6fb46a 2022-01-09 op  */
18 0d6fb46a 2022-01-09 op 
19 0d6fb46a 2022-01-09 op #include <sys/types.h>
20 0d6fb46a 2022-01-09 op #include <string.h>
21 0d6fb46a 2022-01-09 op 
22 0d6fb46a 2022-01-09 op #include "compat.h"
23 0d6fb46a 2022-01-09 op 
24 0d6fb46a 2022-01-09 op /*
25 0d6fb46a 2022-01-09 op  * Copy string src to buffer dst of size dsize.  At most dsize-1
26 0d6fb46a 2022-01-09 op  * chars will be copied.  Always NUL terminates (unless dsize == 0).
27 0d6fb46a 2022-01-09 op  * Returns strlen(src); if retval >= dsize, truncation occurred.
28 0d6fb46a 2022-01-09 op  */
29 0d6fb46a 2022-01-09 op size_t
30 0d6fb46a 2022-01-09 op strlcpy(char *dst, const char *src, size_t dsize)
31 0d6fb46a 2022-01-09 op {
32 0d6fb46a 2022-01-09 op 	const char *osrc = src;
33 0d6fb46a 2022-01-09 op 	size_t nleft = dsize;
34 0d6fb46a 2022-01-09 op 
35 0d6fb46a 2022-01-09 op 	/* Copy as many bytes as will fit. */
36 0d6fb46a 2022-01-09 op 	if (nleft != 0) {
37 0d6fb46a 2022-01-09 op 		while (--nleft != 0) {
38 0d6fb46a 2022-01-09 op 			if ((*dst++ = *src++) == '\0')
39 0d6fb46a 2022-01-09 op 				break;
40 0d6fb46a 2022-01-09 op 		}
41 0d6fb46a 2022-01-09 op 	}
42 0d6fb46a 2022-01-09 op 
43 0d6fb46a 2022-01-09 op 	/* Not enough room in dst, add NUL and traverse rest of src. */
44 0d6fb46a 2022-01-09 op 	if (nleft == 0) {
45 0d6fb46a 2022-01-09 op 		if (dsize != 0)
46 0d6fb46a 2022-01-09 op 			*dst = '\0';		/* NUL-terminate dst */
47 0d6fb46a 2022-01-09 op 		while (*src++)
48 0d6fb46a 2022-01-09 op 			;
49 0d6fb46a 2022-01-09 op 	}
50 0d6fb46a 2022-01-09 op 
51 0d6fb46a 2022-01-09 op 	return(src - osrc - 1);	/* count does not include NUL */
52 0d6fb46a 2022-01-09 op }