1*0afa8e06SEd Maste /* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
2*0afa8e06SEd Maste
3*0afa8e06SEd Maste /*
4*0afa8e06SEd Maste * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5*0afa8e06SEd Maste *
6*0afa8e06SEd Maste * Permission to use, copy, modify, and distribute this software for any
7*0afa8e06SEd Maste * purpose with or without fee is hereby granted, provided that the above
8*0afa8e06SEd Maste * copyright notice and this permission notice appear in all copies.
9*0afa8e06SEd Maste *
10*0afa8e06SEd Maste * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11*0afa8e06SEd Maste * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12*0afa8e06SEd Maste * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13*0afa8e06SEd Maste * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14*0afa8e06SEd Maste * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15*0afa8e06SEd Maste * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16*0afa8e06SEd Maste * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17*0afa8e06SEd Maste */
18*0afa8e06SEd Maste
19*0afa8e06SEd Maste /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */
20*0afa8e06SEd Maste
21*0afa8e06SEd Maste #include "openbsd-compat.h"
22*0afa8e06SEd Maste
23*0afa8e06SEd Maste #if !defined(HAVE_STRLCAT)
24*0afa8e06SEd Maste
25*0afa8e06SEd Maste #include <sys/types.h>
26*0afa8e06SEd Maste #include <string.h>
27*0afa8e06SEd Maste
28*0afa8e06SEd Maste /*
29*0afa8e06SEd Maste * Appends src to string dst of size siz (unlike strncat, siz is the
30*0afa8e06SEd Maste * full size of dst, not space left). At most siz-1 characters
31*0afa8e06SEd Maste * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
32*0afa8e06SEd Maste * Returns strlen(src) + MIN(siz, strlen(initial dst)).
33*0afa8e06SEd Maste * If retval >= siz, truncation occurred.
34*0afa8e06SEd Maste */
35*0afa8e06SEd Maste size_t
strlcat(char * dst,const char * src,size_t siz)36*0afa8e06SEd Maste strlcat(char *dst, const char *src, size_t siz)
37*0afa8e06SEd Maste {
38*0afa8e06SEd Maste char *d = dst;
39*0afa8e06SEd Maste const char *s = src;
40*0afa8e06SEd Maste size_t n = siz;
41*0afa8e06SEd Maste size_t dlen;
42*0afa8e06SEd Maste
43*0afa8e06SEd Maste /* Find the end of dst and adjust bytes left but don't go past end */
44*0afa8e06SEd Maste while (n-- != 0 && *d != '\0')
45*0afa8e06SEd Maste d++;
46*0afa8e06SEd Maste dlen = d - dst;
47*0afa8e06SEd Maste n = siz - dlen;
48*0afa8e06SEd Maste
49*0afa8e06SEd Maste if (n == 0)
50*0afa8e06SEd Maste return(dlen + strlen(s));
51*0afa8e06SEd Maste while (*s != '\0') {
52*0afa8e06SEd Maste if (n != 1) {
53*0afa8e06SEd Maste *d++ = *s;
54*0afa8e06SEd Maste n--;
55*0afa8e06SEd Maste }
56*0afa8e06SEd Maste s++;
57*0afa8e06SEd Maste }
58*0afa8e06SEd Maste *d = '\0';
59*0afa8e06SEd Maste
60*0afa8e06SEd Maste return(dlen + (s - src)); /* count does not include NUL */
61*0afa8e06SEd Maste }
62*0afa8e06SEd Maste
63*0afa8e06SEd Maste #endif /* !defined(HAVE_STRLCAT) */
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