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432e59f9 | 1 | /* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */ |
b09a984b | 2 | |
3 | /* | |
4 | * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> | |
b09a984b | 5 | * |
bffa6723 | 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. | |
b09a984b | 9 | * |
510a42ce | 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. | |
b09a984b | 17 | */ |
18 | ||
f6d4fb87 | 19 | /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */ |
20 | ||
17962c40 | 21 | #include "includes.h" |
b09a984b | 22 | #ifndef HAVE_STRLCAT |
23 | ||
b09a984b | 24 | #include <sys/types.h> |
25 | #include <string.h> | |
26 | ||
27 | /* | |
28 | * Appends src to string dst of size siz (unlike strncat, siz is the | |
29 | * full size of dst, not space left). At most siz-1 characters | |
e400a640 | 30 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). |
f11065cb | 31 | * Returns strlen(src) + MIN(siz, strlen(initial dst)). |
32 | * If retval >= siz, truncation occurred. | |
b09a984b | 33 | */ |
f11065cb | 34 | size_t |
bffa6723 | 35 | strlcat(char *dst, const char *src, size_t siz) |
b09a984b | 36 | { |
432e59f9 | 37 | char *d = dst; |
38 | const char *s = src; | |
39 | size_t n = siz; | |
b09a984b | 40 | size_t dlen; |
41 | ||
42 | /* Find the end of dst and adjust bytes left but don't go past end */ | |
e400a640 | 43 | while (n-- != 0 && *d != '\0') |
b09a984b | 44 | d++; |
45 | dlen = d - dst; | |
46 | n = siz - dlen; | |
47 | ||
48 | if (n == 0) | |
49 | return(dlen + strlen(s)); | |
50 | while (*s != '\0') { | |
51 | if (n != 1) { | |
52 | *d++ = *s; | |
53 | n--; | |
54 | } | |
55 | s++; | |
56 | } | |
57 | *d = '\0'; | |
58 | ||
59 | return(dlen + (s - src)); /* count does not include NUL */ | |
60 | } | |
61 | ||
62 | #endif /* !HAVE_STRLCAT */ |