1 /*
2 * SPDX-License-Identifier: ISC
3 * SPDX-FileCopyrightText: Copyright Todd C. Miller <Todd.Miller@courtesan.com>
4 * SPDX-FileCopyrightText: Copyright TF-RMM Contributors.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 *
18 * OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $
19 */
20
21 #include <stdint.h>
22 #include <string.h>
23
24 /*
25 * Copy string src to buffer dst of size dsize. At most dsize-1
26 * chars will be copied. Always NUL terminates (unless dsize == 0).
27 * Returns strlen(src); if retval >= dsize, truncation occurred.
28 */
strlcpy(char * dst,const char * src,size_t dsize)29 size_t strlcpy(char *dst, const char *src, size_t dsize)
30 {
31 const char *osrc = src;
32 size_t nleft = dsize;
33
34 /* Copy as many bytes as will fit. */
35 if (nleft != 0UL) {
36 while (--nleft != 0UL) {
37 *dst++ = *src++;
38 if (*(dst - 1) == '\0') {
39 break;
40 }
41 }
42 }
43
44 /* Not enough room in dst, add NUL and traverse rest of src. */
45 if (nleft == 0UL) {
46 if (dsize != 0UL) {
47 *dst = '\0'; /* NUL-terminate dst */
48 }
49 while (*src++) {
50 ;
51 }
52 }
53
54 return (src - osrc - 1); /* count does not include NUL */
55 }
56