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1 /* $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 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: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp
$"; | |
32 #endif /* LIBC_SCCS and not lint */ | |
33 | |
34 #include <sys/types.h> | |
35 | |
36 #ifdef HAVE_CONFIG_H | |
37 #include "config.h" | |
38 #endif /* HAVE_CONFIG_H */ | |
39 | |
40 #ifndef HAVE_STRLCPY | |
41 #include "strlcpy-internal.h" | |
42 | |
43 /* | |
44 * Copy src to string dst of size siz. At most siz-1 characters | |
45 * will be copied. Always NUL terminates (unless siz == 0). | |
46 * Returns strlen(src); if retval >= siz, truncation occurred. | |
47 */ | |
48 size_t | |
49 _event_strlcpy(dst, src, siz) | |
50 char *dst; | |
51 const char *src; | |
52 size_t siz; | |
53 { | |
54 register char *d = dst; | |
55 register const char *s = src; | |
56 register size_t n = siz; | |
57 | |
58 /* Copy as many bytes as will fit */ | |
59 if (n != 0 && --n != 0) { | |
60 do { | |
61 if ((*d++ = *s++) == 0) | |
62 break; | |
63 } while (--n != 0); | |
64 } | |
65 | |
66 /* Not enough room in dst, add NUL and traverse rest of src */ | |
67 if (n == 0) { | |
68 if (siz != 0) | |
69 *d = '\0'; /* NUL-terminate dst */ | |
70 while (*s++) | |
71 ; | |
72 } | |
73 | |
74 return(s - src - 1); /* count does not include NUL */ | |
75 } | |
76 #endif | |
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