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3c0ef626 | 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 | #include "config.h" | |
31 | #ifndef HAVE_STRLCPY | |
32 | ||
33 | #if defined(LIBC_SCCS) && !defined(lint) | |
34 | static char *rcsid = "$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $"; | |
35 | #endif /* LIBC_SCCS and not lint */ | |
36 | ||
37 | #include <sys/types.h> | |
38 | #include <string.h> | |
39 | #include "strlcpy.h" | |
40 | ||
41 | /* | |
42 | * Copy src to string dst of size siz. At most siz-1 characters | |
43 | * will be copied. Always NUL terminates (unless siz == 0). | |
44 | * Returns strlen(src); if retval >= siz, truncation occurred. | |
45 | */ | |
46 | size_t | |
47 | strlcpy(dst, src, siz) | |
48 | char *dst; | |
49 | const char *src; | |
50 | size_t siz; | |
51 | { | |
52 | register char *d = dst; | |
53 | register const char *s = src; | |
54 | register size_t n = siz; | |
55 | ||
56 | /* Copy as many bytes as will fit */ | |
57 | if (n != 0 && --n != 0) { | |
58 | do { | |
59 | if ((*d++ = *s++) == 0) | |
60 | break; | |
61 | } while (--n != 0); | |
62 | } | |
63 | ||
64 | /* Not enough room in dst, add NUL and traverse rest of src */ | |
65 | if (n == 0) { | |
66 | if (siz != 0) | |
67 | *d = '\0'; /* NUL-terminate dst */ | |
68 | while (*s++) | |
69 | ; | |
70 | } | |
71 | ||
72 | return(s - src - 1); /* count does not include NUL */ | |
73 | } | |
74 | ||
75 | #endif /* !HAVE_STRLCPY */ |