Annotation of sys/lib/libkern/strlcpy.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: strlcpy.c,v 1.5 2004/08/07 00:38:33 deraadt Exp $ */
2:
3: /*
4: * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #if defined(LIBC_SCCS) && !defined(lint)
20: static char *rcsid = "$OpenBSD: strlcpy.c,v 1.5 2004/08/07 00:38:33 deraadt Exp $";
21: #endif /* LIBC_SCCS and not lint */
22:
23: #if !defined(_KERNEL) && !defined(_STANDALONE)
24: #include <sys/types.h>
25: #include <string.h>
26: #else
27: #include <lib/libkern/libkern.h>
28: #endif
29:
30: /*
31: * Copy src to string dst of size siz. At most siz-1 characters
32: * will be copied. Always NUL terminates (unless siz == 0).
33: * Returns strlen(src); if retval >= siz, truncation occurred.
34: */
35: size_t
36: strlcpy(char *dst, const char *src, size_t siz)
37: {
38: char *d = dst;
39: const char *s = src;
40: size_t n = siz;
41:
42: /* Copy as many bytes as will fit */
43: if (n != 0 && --n != 0) {
44: do {
45: if ((*d++ = *s++) == 0)
46: break;
47: } while (--n != 0);
48: }
49:
50: /* Not enough room in dst, add NUL and traverse rest of src */
51: if (n == 0) {
52: if (siz != 0)
53: *d = '\0'; /* NUL-terminate dst */
54: while (*s++)
55: ;
56: }
57:
58: return(s - src - 1); /* count does not include NUL */
59: }
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