xref: /PHP-8.4/main/strlcpy.c (revision 81d4d5dd)
1 /*
2   +----------------------------------------------------------------------+
3   | Copyright (c) The PHP Group                                          |
4   +----------------------------------------------------------------------+
5   | This source file is subject to version 3.01 of the PHP license,      |
6   | that is bundled with this package in the file LICENSE, and is        |
7   | available through the world-wide-web at the following url:           |
8   | https://www.php.net/license/3_01.txt                                 |
9   | If you did not receive a copy of the PHP license and are unable to   |
10   | obtain it through the world-wide-web, please send a note to          |
11   | license@php.net so we can mail you a copy immediately.               |
12   +----------------------------------------------------------------------+
13   | Author:                                                              |
14   +----------------------------------------------------------------------+
15 */
16 
17 #include "php.h"
18 
19 #ifdef USE_STRLCPY_PHP_IMPL
20 
21 /*     $OpenBSD: strlcpy.c,v 1.15 2016/10/16 17:37:39 dtucker Exp $    */
22 
23 /*
24  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
25  * All rights reserved.
26  *
27  * Redistribution and use in source and binary forms, with or without
28  * modification, are permitted provided that the following conditions
29  * are met:
30  * 1. Redistributions of source code must retain the above copyright
31  *    notice, this list of conditions and the following disclaimer.
32  * 2. Redistributions in binary form must reproduce the above copyright
33  *    notice, this list of conditions and the following disclaimer in the
34  *    documentation and/or other materials provided with the distribution.
35  * 3. The name of the author may not be used to endorse or promote products
36  *    derived from this software without specific prior written permission.
37  *
38  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
39  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
40  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
41  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
42  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
43  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
44  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
45  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
46  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
47  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48  */
49 
50 #if defined(LIBC_SCCS) && !defined(lint)
51 static const char *rcsid = "$OpenBSD: strlcpy.c,v 1.15 2016/10/16 17:37:39 dtucker Exp $";
52 #endif /* LIBC_SCCS and not lint */
53 
54 #include <sys/types.h>
55 #include <string.h>
56 
57 /*
58  * Copy src to string dst of size siz.  At most siz-1 characters
59  * will be copied.  Always NUL terminates (unless siz == 0).
60  * Returns strlen(src); if retval >= siz, truncation occurred.
61  */
php_strlcpy(char * dst,const char * src,size_t siz)62 PHPAPI size_t php_strlcpy(char *dst, const char *src, size_t siz)
63 {
64 	const char *s = src;
65 	size_t n = siz;
66 
67 	/* Copy as many bytes as will fit */
68 	if (n != 0) {
69 		while (--n != 0) {
70 			if ((*dst++ = *src++) == 0)
71 				break;
72 		}
73 	}
74 
75 	/* Not enough room in dst, add NUL and traverse rest of src */
76 	if (n == 0) {
77 		if (siz != 0)
78 			*dst = '\0';		/* NUL-terminate dst */
79 		while (*src++)
80 			;
81 	}
82 
83 	return(src - s - 1);
84 }
85 
86 #endif /* !HAVE_STRLCPY */
87