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3c0ef626 | 1 | /* $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt 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 | #include "config.h" | |
31 | #ifndef HAVE_STRLCAT | |
32 | ||
33 | #if defined(LIBC_SCCS) && !defined(lint) | |
34 | static char *rcsid = "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $"; | |
35 | #endif /* LIBC_SCCS and not lint */ | |
36 | ||
37 | #include <sys/types.h> | |
38 | #include <string.h> | |
39 | #include "strlcat.h" | |
40 | ||
41 | /* | |
42 | * Appends src to string dst of size siz (unlike strncat, siz is the | |
43 | * full size of dst, not space left). At most siz-1 characters | |
44 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). | |
45 | * Returns strlen(src) + MIN(siz, strlen(initial dst)). | |
46 | * If retval >= siz, truncation occurred. | |
47 | */ | |
48 | size_t | |
49 | strlcat(dst, src, siz) | |
50 | char *dst; | |
51 | const char *src; | |
52 | size_t siz; | |
53 | { | |
54 | register char *d = dst; | |
55 | register const char *s = src; | |
56 | register size_t n = siz; | |
57 | size_t dlen; | |
58 | ||
59 | /* Find the end of dst and adjust bytes left but don't go past end */ | |
60 | while (n-- != 0 && *d != '\0') | |
61 | d++; | |
62 | dlen = d - dst; | |
63 | n = siz - dlen; | |
64 | ||
65 | if (n == 0) | |
66 | return(dlen + strlen(s)); | |
67 | while (*s != '\0') { | |
68 | if (n != 1) { | |
69 | *d++ = *s; | |
70 | n--; | |
71 | } | |
72 | s++; | |
73 | } | |
74 | *d = '\0'; | |
75 | ||
76 | return(dlen + (s - src)); /* count does not include NUL */ | |
77 | } | |
78 | ||
79 | #endif /* !HAVE_STRLCAT */ |