Ruby 2.0.0p247(2013-06-27revision41674)

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strlcat.c
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1 /* $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char *rcsid = "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $";
32 #endif /* LIBC_SCCS and not lint */
33
34 #include "ruby/missing.h"
35 #include <sys/types.h>
36 #include <string.h>
37
38 /*
39 * Appends src to string dst of size siz (unlike strncat, siz is the
40 * full size of dst, not space left). At most siz-1 characters
41 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
42 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
43 * If retval >= siz, truncation occurred.
44 */
45 size_t
46 strlcat(dst, src, siz)
47 char *dst;
48 const char *src;
49 size_t siz;
50 {
51 register char *d = dst;
52 register const char *s = src;
53 register size_t n = siz;
54 size_t dlen;
55
56 /* Find the end of dst and adjust bytes left but don't go past end */
57 while (n-- != 0 && *d != '\0')
58 d++;
59 dlen = d - dst;
60 n = siz - dlen;
61
62 if (n == 0)
63 return(dlen + strlen(s));
64 while (*s != '\0') {
65 if (n != 1) {
66 *d++ = *s;
67 n--;
68 }
69 s++;
70 }
71 *d = '\0';
72
73 return(dlen + (s - src)); /* count does not include NUL */
74 }
75