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-rw-r--r--strlcpy.c73
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1/* $OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 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 1.4 1999/05/01 18:56:41 millert Exp $";
32#endif /* LIBC_SCCS and not lint */
33
34#include <sys/types.h>
35#include <string.h>
36
37#include "config.h"
38#ifndef HAVE_STRLCPY
39
40/*
41 * Copy src to string dst of size siz. At most siz-1 characters
42 * will be copied. Always NUL terminates (unless siz == 0).
43 * Returns strlen(src); if retval >= siz, truncation occurred.
44 */
45size_t strlcpy(dst, src, siz)
46 char *dst;
47 const char *src;
48 size_t siz;
49{
50 register char *d = dst;
51 register const char *s = src;
52 register size_t n = siz;
53
54 /* Copy as many bytes as will fit */
55 if (n != 0 && --n != 0) {
56 do {
57 if ((*d++ = *s++) == 0)
58 break;
59 } while (--n != 0);
60 }
61
62 /* Not enough room in dst, add NUL and traverse rest of src */
63 if (n == 0) {
64 if (siz != 0)
65 *d = '\0'; /* NUL-terminate dst */
66 while (*s++)
67 ;
68 }
69
70 return(s - src - 1); /* count does not include NUL */
71}
72
73#endif /* !HAVE_STRLCPY */