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1 b0003f58 2021-03-08 op /* $OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $ */
2 b0003f58 2021-03-08 op
3 b0003f58 2021-03-08 op /*
4 b0003f58 2021-03-08 op * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
5 b0003f58 2021-03-08 op *
6 b0003f58 2021-03-08 op * Permission to use, copy, modify, and distribute this software for any
7 b0003f58 2021-03-08 op * purpose with or without fee is hereby granted, provided that the above
8 b0003f58 2021-03-08 op * copyright notice and this permission notice appear in all copies.
9 b0003f58 2021-03-08 op *
10 b0003f58 2021-03-08 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 b0003f58 2021-03-08 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 b0003f58 2021-03-08 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 b0003f58 2021-03-08 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 b0003f58 2021-03-08 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 b0003f58 2021-03-08 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 b0003f58 2021-03-08 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 b0003f58 2021-03-08 op */
18 b0003f58 2021-03-08 op
19 b0003f58 2021-03-08 op #include <sys/types.h>
20 b0003f58 2021-03-08 op #include <string.h>
21 b0003f58 2021-03-08 op
22 b0003f58 2021-03-08 op #include "compat.h"
23 b0003f58 2021-03-08 op
24 b0003f58 2021-03-08 op /*
25 b0003f58 2021-03-08 op * Copy string src to buffer dst of size dsize. At most dsize-1
26 b0003f58 2021-03-08 op * chars will be copied. Always NUL terminates (unless dsize == 0).
27 b0003f58 2021-03-08 op * Returns strlen(src); if retval >= dsize, truncation occurred.
28 b0003f58 2021-03-08 op */
29 b0003f58 2021-03-08 op size_t
30 b0003f58 2021-03-08 op strlcpy(char *dst, const char *src, size_t dsize)
31 b0003f58 2021-03-08 op {
32 b0003f58 2021-03-08 op const char *osrc = src;
33 b0003f58 2021-03-08 op size_t nleft = dsize;
34 b0003f58 2021-03-08 op
35 b0003f58 2021-03-08 op /* Copy as many bytes as will fit. */
36 b0003f58 2021-03-08 op if (nleft != 0) {
37 b0003f58 2021-03-08 op while (--nleft != 0) {
38 b0003f58 2021-03-08 op if ((*dst++ = *src++) == '\0')
39 b0003f58 2021-03-08 op break;
40 b0003f58 2021-03-08 op }
41 b0003f58 2021-03-08 op }
42 b0003f58 2021-03-08 op
43 b0003f58 2021-03-08 op /* Not enough room in dst, add NUL and traverse rest of src. */
44 b0003f58 2021-03-08 op if (nleft == 0) {
45 b0003f58 2021-03-08 op if (dsize != 0)
46 b0003f58 2021-03-08 op *dst = '\0'; /* NUL-terminate dst */
47 b0003f58 2021-03-08 op while (*src++)
48 b0003f58 2021-03-08 op ;
49 b0003f58 2021-03-08 op }
50 b0003f58 2021-03-08 op
51 b0003f58 2021-03-08 op return(src - osrc - 1); /* count does not include NUL */
52 b0003f58 2021-03-08 op }