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

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

First import

File size: 2.5 KB
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1/*      $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 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: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $";
32#endif /* LIBC_SCCS and not lint */
33
34#include <string.h>
35
36/*
37 * Appends src to string dst of size siz (unlike strncat, siz is the
38 * full size of dst, not space left).  At most siz-1 characters
39 * will be copied.  Always NUL terminates (unless siz == 0).
40 * Returns strlen(initial dst) + strlen(src); if retval >= siz,
41 * truncation occurred.
42 */
43size_t strlcat(dst, src, siz)
44        char *dst;
45        const char *src;
46        size_t siz;
47{
48        register char *d = dst;
49        register const char *s = src;
50        register size_t n = siz;
51        size_t dlen;
52
53        /* Find the end of dst and adjust bytes left but don't go past end */
54        while (*d != '\0' && n-- != 0)
55                d++;
56        dlen = d - dst;
57        n = siz - dlen;
58
59        if (n == 0)
60                return(dlen + strlen(s));
61        while (*s != '\0') {
62                if (n != 1) {
63                        *d++ = *s;
64                        n--;
65                }
66                s++;
67        }
68        *d = '\0';
69
70        return(dlen + (s - src));       /* count does not include NUL */
71}
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