/src/unbound/compat/strlcat.c
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1 | | /* compat/strlcat.c */ |
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 | | /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */ |
31 | | |
32 | | #include "config.h" |
33 | | #ifndef HAVE_STRLCAT |
34 | | |
35 | | #include <sys/types.h> |
36 | | #include <string.h> |
37 | | |
38 | | /* |
39 | | * Appends src to string dst of size siz (unlike strncat, siz is the |
40 | | * full size of dst, not space left). At most siz-1 characters |
41 | | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). |
42 | | * Returns strlen(src) + MIN(siz, strlen(initial dst)). |
43 | | * If retval >= siz, truncation occurred. |
44 | | */ |
45 | | size_t |
46 | | strlcat(char *dst, const char *src, size_t siz) |
47 | 0 | { |
48 | 0 | char *d = dst; |
49 | 0 | const char *s = src; |
50 | 0 | size_t n = siz; |
51 | 0 | size_t dlen; |
52 | | |
53 | | /* Find the end of dst and adjust bytes left but don't go past end */ |
54 | 0 | while (n-- != 0 && *d != '\0') |
55 | 0 | d++; |
56 | 0 | dlen = d - dst; |
57 | 0 | n = siz - dlen; |
58 | |
|
59 | 0 | if (n == 0) |
60 | 0 | return(dlen + strlen(s)); |
61 | 0 | while (*s != '\0') { |
62 | 0 | if (n != 1) { |
63 | 0 | *d++ = *s; |
64 | 0 | n--; |
65 | 0 | } |
66 | 0 | s++; |
67 | 0 | } |
68 | 0 | *d = '\0'; |
69 | |
|
70 | 0 | return(dlen + (s - src)); /* count does not include NUL */ |
71 | 0 | } |
72 | | |
73 | | #endif /* !HAVE_STRLCAT */ |