Tor  0.4.6.0-alpha-dev
strlcpy.c
1 /* $OpenBSD: strlcpy.c,v 1.2 1998/11/06 04:33:16 wvdputte 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: strlcpy.c,v 1.2 1998/11/06 04:33:16 wvdputte Exp $";
32 #endif /* LIBC_SCCS and not lint */
33 
34 #include <sys/types.h>
35 #include <string.h>
36 
37 /*
38  * Copy src to string dst of size siz. At most siz-1 characters
39  * will be copied. Always NUL terminates (unless siz == 0).
40  * Returns strlen(src); if retval >= siz, truncation occurred.
41  */
42 size_t strlcpy(char *dst, const char *src, size_t siz)
43 {
44  register char *d = dst;
45  register const char *s = src;
46  register size_t n = siz;
47 
48  if (n == 0)
49  return(strlen(s));
50  while (*s != '\0') {
51  if (n != 1) {
52  *d++ = *s;
53  n--;
54  }
55  s++;
56  }
57  *d = '\0';
58 
59  return(s - src); /* count does not include NUL */
60 }