source: trunk/sys/dietlibc/strlcpy.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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[1]1/*      $OpenBSD: strlcpy.c,v 1.3 1999/04/24 01:17:37 millert Exp $     */
2
3/*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char *rcsid = "$OpenBSD: strlcpy.c,v 1.3 1999/04/24 01:17:37 millert Exp $";
32#endif /* LIBC_SCCS and not lint */
33
34#include <string.h>
35
36/*
37 * Copy src to string dst of size siz.  At most siz-1 characters
38 * will be copied.  Always NUL terminates (unless siz == 0).
39 * Returns strlen(src); if retval >= siz, truncation occurred.
40 */
41size_t strlcpy(dst, src, siz)
42        char *dst;
43        const char *src;
44        size_t siz;
45{
46        register char *d = dst;
47        register const char *s = src;
48        register size_t n = siz;
49
50        /* Copy as many bytes as will fit */
51        if (n != 0 && --n != 0) {
52                do {
53                        if ((*d++ = *s++) == 0)
54                                break;
55                } while (--n != 0);
56        }
57
58        /* Not enough room in dst, add NUL and traverse rest of src */
59        if (n == 0) {
60                if (siz != 0)
61                        *d = '\0';              /* NUL-terminate dst */
62                while (*s++)
63                        ;
64        }
65
66        return(s - src - 1);    /* count does not include NUL */
67}
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