Age Owner TLA Line data Source code
1 : /*
2 : * src/port/strlcat.c
3 : *
4 : * $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
5 :
6 : /*
7 : * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
8 : *
9 : * Permission to use, copy, modify, and distribute this software for any
10 : * purpose with or without fee is hereby granted, provided that the above
11 : * copyright notice and this permission notice appear in all copies.
12 : *
13 : * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
14 : * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
15 : * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
16 : * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
17 : * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 : * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 : * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 : */
21 :
22 : #include "c.h"
23 :
24 :
25 : /*
26 : * Appends src to string dst of size siz (unlike strncat, siz is the
27 : * full size of dst, not space left). At most siz-1 characters
28 : * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
29 : * Returns strlen(src) + MIN(siz, strlen(initial dst)).
30 : * If retval >= siz, truncation occurred.
31 : */
32 : size_t
5905 peter_e 33 CBC 1861 : strlcat(char *dst, const char *src, size_t siz)
34 : {
5624 bruce 35 1861 : char *d = dst;
5905 peter_e 36 1861 : const char *s = src;
5624 bruce 37 1861 : size_t n = siz;
38 : size_t dlen;
39 :
40 : /* Find the end of dst and adjust bytes left but don't go past end */
5905 peter_e 41 167487 : while (n-- != 0 && *d != '\0')
42 165626 : d++;
43 1861 : dlen = d - dst;
44 1861 : n = siz - dlen;
45 :
46 1861 : if (n == 0)
5624 bruce 47 UBC 0 : return (dlen + strlen(s));
5624 bruce 48 CBC 12724 : while (*s != '\0')
49 : {
50 10863 : if (n != 1)
51 : {
5905 peter_e 52 10863 : *d++ = *s;
53 10863 : n--;
54 : }
55 10863 : s++;
56 : }
57 1861 : *d = '\0';
58 :
5624 bruce 59 1861 : return (dlen + (s - src)); /* count does not include NUL */
60 : }
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