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d74671e4 | 1 | /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */ |
2 | ||
510a42ce | 3 | /* $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $ */ |
b09a984b | 4 | |
5 | /* | |
6 | * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> | |
b09a984b | 7 | * |
bffa6723 | 8 | * Permission to use, copy, modify, and distribute this software for any |
9 | * purpose with or without fee is hereby granted, provided that the above | |
10 | * copyright notice and this permission notice appear in all copies. | |
b09a984b | 11 | * |
510a42ce | 12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
13 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
14 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
15 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
16 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
17 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
18 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
b09a984b | 19 | */ |
20 | ||
17962c40 | 21 | #include "includes.h" |
b09a984b | 22 | #ifndef HAVE_STRLCAT |
23 | ||
24 | #if defined(LIBC_SCCS) && !defined(lint) | |
510a42ce | 25 | static char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $"; |
b09a984b | 26 | #endif /* LIBC_SCCS and not lint */ |
27 | ||
28 | #include <sys/types.h> | |
29 | #include <string.h> | |
30 | ||
31 | /* | |
32 | * Appends src to string dst of size siz (unlike strncat, siz is the | |
33 | * full size of dst, not space left). At most siz-1 characters | |
e400a640 | 34 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). |
f11065cb | 35 | * Returns strlen(src) + MIN(siz, strlen(initial dst)). |
36 | * If retval >= siz, truncation occurred. | |
b09a984b | 37 | */ |
f11065cb | 38 | size_t |
bffa6723 | 39 | strlcat(char *dst, const char *src, size_t siz) |
b09a984b | 40 | { |
41 | register char *d = dst; | |
42 | register const char *s = src; | |
43 | register size_t n = siz; | |
44 | size_t dlen; | |
45 | ||
46 | /* Find the end of dst and adjust bytes left but don't go past end */ | |
e400a640 | 47 | while (n-- != 0 && *d != '\0') |
b09a984b | 48 | d++; |
49 | dlen = d - dst; | |
50 | n = siz - dlen; | |
51 | ||
52 | if (n == 0) | |
53 | return(dlen + strlen(s)); | |
54 | while (*s != '\0') { | |
55 | if (n != 1) { | |
56 | *d++ = *s; | |
57 | n--; | |
58 | } | |
59 | s++; | |
60 | } | |
61 | *d = '\0'; | |
62 | ||
63 | return(dlen + (s - src)); /* count does not include NUL */ | |
64 | } | |
65 | ||
66 | #endif /* !HAVE_STRLCAT */ |