Age Owner Branch data 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
6276 peter_e@gmx.net 33 :CBC 872 : strlcat(char *dst, const char *src, size_t siz)
34 : : {
5995 bruce@momjian.us 35 : 872 : char *d = dst;
6276 peter_e@gmx.net 36 : 872 : const char *s = src;
5995 bruce@momjian.us 37 : 872 : 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 */
6276 peter_e@gmx.net 41 [ + - + + ]: 81356 : while (n-- != 0 && *d != '\0')
42 : 80484 : d++;
43 : 872 : dlen = d - dst;
44 : 872 : n = siz - dlen;
45 : :
46 [ - + ]: 872 : if (n == 0)
5995 bruce@momjian.us 47 :UBC 0 : return (dlen + strlen(s));
5995 bruce@momjian.us 48 [ + + ]:CBC 12520 : while (*s != '\0')
49 : : {
50 [ + - ]: 11648 : if (n != 1)
51 : : {
6276 peter_e@gmx.net 52 : 11648 : *d++ = *s;
53 : 11648 : n--;
54 : : }
55 : 11648 : s++;
56 : : }
57 : 872 : *d = '\0';
58 : :
5995 bruce@momjian.us 59 : 872 : return (dlen + (s - src)); /* count does not include NUL */
60 : : }
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