Annotation of mandoc/compat_strlcat.c, Revision 1.3
1.2 kristaps 1: #include "config.h"
2:
1.1 kristaps 3: #ifdef HAVE_STRLCAT
4:
5: int dummy;
6:
7: #else
8:
9: /* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
10:
11: /*
12: * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
13: *
14: * Permission to use, copy, modify, and distribute this software for any
15: * purpose with or without fee is hereby granted, provided that the above
16: * copyright notice and this permission notice appear in all copies.
17: *
18: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
19: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
20: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
21: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
22: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
23: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
24: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
25: */
26:
27: #include <sys/types.h>
28: #include <string.h>
29:
30: /*
31: * Appends src to string dst of size siz (unlike strncat, siz is the
32: * full size of dst, not space left). At most siz-1 characters
33: * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
34: * Returns strlen(src) + MIN(siz, strlen(initial dst)).
35: * If retval >= siz, truncation occurred.
36: */
37: size_t
38: strlcat(char *dst, const char *src, size_t siz)
39: {
40: char *d = dst;
41: const char *s = src;
42: size_t n = siz;
43: size_t dlen;
44:
45: /* Find the end of dst and adjust bytes left but don't go past end */
46: while (n-- != 0 && *d != '\0')
47: d++;
48: dlen = d - dst;
49: n = siz - dlen;
50:
51: if (n == 0)
52: return(dlen + strlen(s));
53: while (*s != '\0') {
54: if (n != 1) {
55: *d++ = *s;
56: n--;
57: }
58: s++;
59: }
60: *d = '\0';
61:
62: return(dlen + (s - src)); /* count does not include NUL */
63: }
64:
65: #endif
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