1 bbcba3ed 2022-01-10 op /*	$OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $	*/
 2 bbcba3ed 2022-01-10 op 
 3 bbcba3ed 2022-01-10 op /*
 4 bbcba3ed 2022-01-10 op  * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
 5 bbcba3ed 2022-01-10 op  *
 6 bbcba3ed 2022-01-10 op  * Permission to use, copy, modify, and distribute this software for any
 7 bbcba3ed 2022-01-10 op  * purpose with or without fee is hereby granted, provided that the above
 8 bbcba3ed 2022-01-10 op  * copyright notice and this permission notice appear in all copies.
 9 bbcba3ed 2022-01-10 op  *
10 bbcba3ed 2022-01-10 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 bbcba3ed 2022-01-10 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 bbcba3ed 2022-01-10 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 bbcba3ed 2022-01-10 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 bbcba3ed 2022-01-10 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 bbcba3ed 2022-01-10 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 bbcba3ed 2022-01-10 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 bbcba3ed 2022-01-10 op  */
18 bbcba3ed 2022-01-10 op 
19 bbcba3ed 2022-01-10 op #include <sys/types.h>
20 bbcba3ed 2022-01-10 op #include <string.h>
21 bbcba3ed 2022-01-10 op 
22 bbcba3ed 2022-01-10 op #include "compat.h"
23 bbcba3ed 2022-01-10 op 
24 bbcba3ed 2022-01-10 op /*
25 bbcba3ed 2022-01-10 op  * Copy string src to buffer dst of size dsize.  At most dsize-1
26 bbcba3ed 2022-01-10 op  * chars will be copied.  Always NUL terminates (unless dsize == 0).
27 bbcba3ed 2022-01-10 op  * Returns strlen(src); if retval >= dsize, truncation occurred.
28 bbcba3ed 2022-01-10 op  */
29 bbcba3ed 2022-01-10 op size_t
30 bbcba3ed 2022-01-10 op strlcpy(char *dst, const char *src, size_t dsize)
31 bbcba3ed 2022-01-10 op {
32 bbcba3ed 2022-01-10 op 	const char *osrc = src;
33 bbcba3ed 2022-01-10 op 	size_t nleft = dsize;
34 bbcba3ed 2022-01-10 op 
35 bbcba3ed 2022-01-10 op 	/* Copy as many bytes as will fit. */
36 bbcba3ed 2022-01-10 op 	if (nleft != 0) {
37 bbcba3ed 2022-01-10 op 		while (--nleft != 0) {
38 bbcba3ed 2022-01-10 op 			if ((*dst++ = *src++) == '\0')
39 bbcba3ed 2022-01-10 op 				break;
40 bbcba3ed 2022-01-10 op 		}
41 bbcba3ed 2022-01-10 op 	}
42 bbcba3ed 2022-01-10 op 
43 bbcba3ed 2022-01-10 op 	/* Not enough room in dst, add NUL and traverse rest of src. */
44 bbcba3ed 2022-01-10 op 	if (nleft == 0) {
45 bbcba3ed 2022-01-10 op 		if (dsize != 0)
46 bbcba3ed 2022-01-10 op 			*dst = '\0';		/* NUL-terminate dst */
47 bbcba3ed 2022-01-10 op 		while (*src++)
48 bbcba3ed 2022-01-10 op 			;
49 bbcba3ed 2022-01-10 op 	}
50 bbcba3ed 2022-01-10 op 
51 bbcba3ed 2022-01-10 op 	return(src - osrc - 1);	/* count does not include NUL */
52 bbcba3ed 2022-01-10 op }