xref: /PHP-7.0/main/strlcat.c (revision 478f119a)
1 /*
2   +----------------------------------------------------------------------+
3   | PHP Version 7                                                        |
4   +----------------------------------------------------------------------+
5   | Copyright (c) 1997-2017 The PHP Group                                |
6   +----------------------------------------------------------------------+
7   | This source file is subject to version 3.01 of the PHP license,      |
8   | that is bundled with this package in the file LICENSE, and is        |
9   | available through the world-wide-web at the following url:           |
10   | http://www.php.net/license/3_01.txt                                  |
11   | If you did not receive a copy of the PHP license and are unable to   |
12   | obtain it through the world-wide-web, please send a note to          |
13   | license@php.net so we can mail you a copy immediately.               |
14   +----------------------------------------------------------------------+
15   | Author:                                                              |
16   +----------------------------------------------------------------------+
17 */
18 
19 /* $Id$ */
20 
21 #include "php.h"
22 
23 #ifndef HAVE_STRLCAT
24 
25 /*	$OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $	*/
26 
27 /*
28  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
29  * All rights reserved.
30  *
31  * Redistribution and use in source and binary forms, with or without
32  * modification, are permitted provided that the following conditions
33  * are met:
34  * 1. Redistributions of source code must retain the above copyright
35  *    notice, this list of conditions and the following disclaimer.
36  * 2. Redistributions in binary form must reproduce the above copyright
37  *    notice, this list of conditions and the following disclaimer in the
38  *    documentation and/or other materials provided with the distribution.
39  * 3. The name of the author may not be used to endorse or promote products
40  *    derived from this software without specific prior written permission.
41  *
42  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
43  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
44  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
45  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
46  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
47  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
48  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
49  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
50  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
51  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
52  */
53 
54 #if defined(LIBC_SCCS) && !defined(lint)
55 static char *rcsid = "$OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $";
56 #endif /* LIBC_SCCS and not lint */
57 
58 #include <sys/types.h>
59 #include <string.h>
60 
61 /*
62  * Appends src to string dst of size siz (unlike strncat, siz is the
63  * full size of dst, not space left).  At most siz-1 characters
64  * will be copied.  Always NUL terminates (unless siz == 0).
65  * Returns strlen(src); if retval >= siz, truncation occurred.
66  */
php_strlcat(dst,src,siz)67 PHPAPI size_t php_strlcat(dst, src, siz)
68 	char *dst;
69 	const char *src;
70 	size_t siz;
71 {
72 	register char *d = dst;
73 	register const char *s = src;
74 	register size_t n = siz;
75 	size_t dlen;
76 
77 	/* Find the end of dst and adjust bytes left but don't go past end */
78 	while (*d != '\0' && n-- != 0)
79 		d++;
80 	dlen = d - dst;
81 	n = siz - dlen;
82 
83 	if (n == 0)
84 		return(dlen + strlen(s));
85 	while (*s != '\0') {
86 		if (n != 1) {
87 			*d++ = *s;
88 			n--;
89 		}
90 		s++;
91 	}
92 	*d = '\0';
93 
94 	return(dlen + (s - src));	/* count does not include NUL */
95 }
96 
97 #endif /* !HAVE_STRLCAT */
98 
99 /*
100  * Local variables:
101  * tab-width: 4
102  * c-basic-offset: 4
103  * End:
104  * vim600: sw=4 ts=4 fdm=marker
105  * vim<600: sw=4 ts=4
106  */
107