xref: /freebsd/contrib/ldns/compat/strlcpy.c (revision cfe30d02adda7c3b5c76156ac52d50d8cab325d9)
1*7b5038d7SDag-Erling Smørgrav /* from openssh 4.3p2 compat/strlcpy.c */
2*7b5038d7SDag-Erling Smørgrav /*
3*7b5038d7SDag-Erling Smørgrav  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
4*7b5038d7SDag-Erling Smørgrav  *
5*7b5038d7SDag-Erling Smørgrav  * Permission to use, copy, modify, and distribute this software for any
6*7b5038d7SDag-Erling Smørgrav  * purpose with or without fee is hereby granted, provided that the above
7*7b5038d7SDag-Erling Smørgrav  * copyright notice and this permission notice appear in all copies.
8*7b5038d7SDag-Erling Smørgrav  *
9*7b5038d7SDag-Erling Smørgrav  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10*7b5038d7SDag-Erling Smørgrav  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11*7b5038d7SDag-Erling Smørgrav  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12*7b5038d7SDag-Erling Smørgrav  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13*7b5038d7SDag-Erling Smørgrav  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14*7b5038d7SDag-Erling Smørgrav  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15*7b5038d7SDag-Erling Smørgrav  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16*7b5038d7SDag-Erling Smørgrav  */
17*7b5038d7SDag-Erling Smørgrav 
18*7b5038d7SDag-Erling Smørgrav /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */
19*7b5038d7SDag-Erling Smørgrav 
20*7b5038d7SDag-Erling Smørgrav #include <ldns/config.h>
21*7b5038d7SDag-Erling Smørgrav #ifndef HAVE_STRLCPY
22*7b5038d7SDag-Erling Smørgrav 
23*7b5038d7SDag-Erling Smørgrav #include <sys/types.h>
24*7b5038d7SDag-Erling Smørgrav #include <string.h>
25*7b5038d7SDag-Erling Smørgrav 
26*7b5038d7SDag-Erling Smørgrav /*
27*7b5038d7SDag-Erling Smørgrav  * Copy src to string dst of size siz.  At most siz-1 characters
28*7b5038d7SDag-Erling Smørgrav  * will be copied.  Always NUL terminates (unless siz == 0).
29*7b5038d7SDag-Erling Smørgrav  * Returns strlen(src); if retval >= siz, truncation occurred.
30*7b5038d7SDag-Erling Smørgrav  */
31*7b5038d7SDag-Erling Smørgrav size_t
strlcpy(char * dst,const char * src,size_t siz)32*7b5038d7SDag-Erling Smørgrav strlcpy(char *dst, const char *src, size_t siz)
33*7b5038d7SDag-Erling Smørgrav {
34*7b5038d7SDag-Erling Smørgrav 	char *d = dst;
35*7b5038d7SDag-Erling Smørgrav 	const char *s = src;
36*7b5038d7SDag-Erling Smørgrav 	size_t n = siz;
37*7b5038d7SDag-Erling Smørgrav 
38*7b5038d7SDag-Erling Smørgrav 	/* Copy as many bytes as will fit */
39*7b5038d7SDag-Erling Smørgrav 	if (n != 0 && --n != 0) {
40*7b5038d7SDag-Erling Smørgrav 		do {
41*7b5038d7SDag-Erling Smørgrav 			if ((*d++ = *s++) == 0)
42*7b5038d7SDag-Erling Smørgrav 				break;
43*7b5038d7SDag-Erling Smørgrav 		} while (--n != 0);
44*7b5038d7SDag-Erling Smørgrav 	}
45*7b5038d7SDag-Erling Smørgrav 
46*7b5038d7SDag-Erling Smørgrav 	/* Not enough room in dst, add NUL and traverse rest of src */
47*7b5038d7SDag-Erling Smørgrav 	if (n == 0) {
48*7b5038d7SDag-Erling Smørgrav 		if (siz != 0)
49*7b5038d7SDag-Erling Smørgrav 			*d = '\0';		/* NUL-terminate dst */
50*7b5038d7SDag-Erling Smørgrav 		while (*s++)
51*7b5038d7SDag-Erling Smørgrav 			;
52*7b5038d7SDag-Erling Smørgrav 	}
53*7b5038d7SDag-Erling Smørgrav 
54*7b5038d7SDag-Erling Smørgrav 	return(s - src - 1);	/* count does not include NUL */
55*7b5038d7SDag-Erling Smørgrav }
56*7b5038d7SDag-Erling Smørgrav 
57*7b5038d7SDag-Erling Smørgrav #endif /* !HAVE_STRLCPY */
58