1 // SPDX-License-Identifier: BSD-3-Clause
2 /* This file is copied from newlib-1.19 */
3
4 /* $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $ */
5
6 /*
7 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
23 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
24 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
27 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
30 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char *rcsid =
35 "$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $";
36 #endif /* LIBC_SCCS and not lint */
37
38 #include <types_ext.h>
39 #include <string_ext.h>
40
41 /*
42 * Copy src to string dst of size siz. At most siz-1 characters
43 * will be copied. Always NUL terminates (unless siz == 0).
44 * Returns strlen(src); if retval >= siz, truncation occurred.
45 */
strlcpy(char * dst,const char * src,size_t siz)46 size_t strlcpy(char *dst, const char *src, size_t siz)
47 {
48 register char *d = dst;
49 register const char *s = src;
50 register size_t n = siz;
51
52 /* Copy as many bytes as will fit */
53 if (n != 0 && --n != 0) {
54 do {
55 if ((*d++ = *s++) == 0)
56 break;
57 } while (--n != 0);
58 }
59
60 /* Not enough room in dst, add NUL and traverse rest of src */
61 if (n == 0) {
62 if (siz != 0)
63 *d = '\0'; /* NUL-terminate dst */
64 while (*s++)
65 ;
66 }
67
68 return s - src - 1; /* count does not include NUL */
69 }
70