1 c423c56e 2022-09-25 op /*
 2 c423c56e 2022-09-25 op  * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
 3 c423c56e 2022-09-25 op  *
 4 c423c56e 2022-09-25 op  * Permission to use, copy, modify, and distribute this software for any
 5 c423c56e 2022-09-25 op  * purpose with or without fee is hereby granted, provided that the above
 6 c423c56e 2022-09-25 op  * copyright notice and this permission notice appear in all copies.
 7 c423c56e 2022-09-25 op  *
 8 c423c56e 2022-09-25 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9 c423c56e 2022-09-25 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 c423c56e 2022-09-25 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 c423c56e 2022-09-25 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 c423c56e 2022-09-25 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 c423c56e 2022-09-25 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 c423c56e 2022-09-25 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 c423c56e 2022-09-25 op  */
16 c423c56e 2022-09-25 op 
17 c423c56e 2022-09-25 op #include <sys/types.h>
18 c423c56e 2022-09-25 op #include <string.h>
19 c423c56e 2022-09-25 op 
20 c423c56e 2022-09-25 op /*
21 c423c56e 2022-09-25 op  * Copy string src to buffer dst of size dsize.  At most dsize-1
22 c423c56e 2022-09-25 op  * chars will be copied.  Always NUL terminates (unless dsize == 0).
23 c423c56e 2022-09-25 op  * Returns strlen(src); if retval >= dsize, truncation occurred.
24 c423c56e 2022-09-25 op  */
25 c423c56e 2022-09-25 op size_t
26 c423c56e 2022-09-25 op strlcpy(char *dst, const char *src, size_t dsize)
27 c423c56e 2022-09-25 op {
28 c423c56e 2022-09-25 op 	const char *osrc = src;
29 c423c56e 2022-09-25 op 	size_t nleft = dsize;
30 c423c56e 2022-09-25 op 
31 c423c56e 2022-09-25 op 	/* Copy as many bytes as will fit. */
32 c423c56e 2022-09-25 op 	if (nleft != 0) {
33 c423c56e 2022-09-25 op 		while (--nleft != 0) {
34 c423c56e 2022-09-25 op 			if ((*dst++ = *src++) == '\0')
35 c423c56e 2022-09-25 op 				break;
36 c423c56e 2022-09-25 op 		}
37 c423c56e 2022-09-25 op 	}
38 c423c56e 2022-09-25 op 
39 c423c56e 2022-09-25 op 	/* Not enough room in dst, add NUL and traverse rest of src. */
40 c423c56e 2022-09-25 op 	if (nleft == 0) {
41 c423c56e 2022-09-25 op 		if (dsize != 0)
42 c423c56e 2022-09-25 op 			*dst = '\0';		/* NUL-terminate dst */
43 c423c56e 2022-09-25 op 		while (*src++)
44 c423c56e 2022-09-25 op 			;
45 c423c56e 2022-09-25 op 	}
46 c423c56e 2022-09-25 op 
47 c423c56e 2022-09-25 op 	return(src - osrc - 1);	/* count does not include NUL */
48 c423c56e 2022-09-25 op }