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0fff78ff | 1 | /* $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $ */ |
3c0ef626 | 2 | |
3 | /* | |
4 | * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> | |
3c0ef626 | 5 | * |
0fff78ff | 6 | * Permission to use, copy, modify, and distribute this software for any |
7 | * purpose with or without fee is hereby granted, provided that the above | |
8 | * copyright notice and this permission notice appear in all copies. | |
3c0ef626 | 9 | * |
0fff78ff | 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
3c0ef626 | 17 | */ |
18 | ||
41b2f314 | 19 | #include "includes.h" |
3c0ef626 | 20 | #ifndef HAVE_STRLCAT |
21 | ||
22 | #if defined(LIBC_SCCS) && !defined(lint) | |
0fff78ff | 23 | static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $"; |
3c0ef626 | 24 | #endif /* LIBC_SCCS and not lint */ |
25 | ||
26 | #include <sys/types.h> | |
27 | #include <string.h> | |
3c0ef626 | 28 | |
29 | /* | |
30 | * Appends src to string dst of size siz (unlike strncat, siz is the | |
31 | * full size of dst, not space left). At most siz-1 characters | |
32 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). | |
33 | * Returns strlen(src) + MIN(siz, strlen(initial dst)). | |
34 | * If retval >= siz, truncation occurred. | |
35 | */ | |
36 | size_t | |
0fff78ff | 37 | strlcat(char *dst, const char *src, size_t siz) |
3c0ef626 | 38 | { |
39 | register char *d = dst; | |
40 | register const char *s = src; | |
41 | register size_t n = siz; | |
42 | size_t dlen; | |
43 | ||
44 | /* Find the end of dst and adjust bytes left but don't go past end */ | |
45 | while (n-- != 0 && *d != '\0') | |
46 | d++; | |
47 | dlen = d - dst; | |
48 | n = siz - dlen; | |
49 | ||
50 | if (n == 0) | |
51 | return(dlen + strlen(s)); | |
52 | while (*s != '\0') { | |
53 | if (n != 1) { | |
54 | *d++ = *s; | |
55 | n--; | |
56 | } | |
57 | s++; | |
58 | } | |
59 | *d = '\0'; | |
60 | ||
61 | return(dlen + (s - src)); /* count does not include NUL */ | |
62 | } | |
63 | ||
64 | #endif /* !HAVE_STRLCAT */ |