1 /* $NetBSD: strlcat.c,v 1.2 2015/01/22 03:48:07 christos Exp $ */
2 /* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */
5 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
12 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
13 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
14 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
16 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
17 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #if !defined(_KERNEL) && !defined(_STANDALONE)
25 #include <sys/cdefs.h>
26 #if defined(LIBC_SCCS) && !defined(lint)
27 __RCSID("$NetBSD: strlcat.c,v 1.2 2015/01/22 03:48:07 christos Exp $");
28 #endif /* LIBC_SCCS and not lint */
31 #include "namespace.h"
33 #include <sys/types.h>
39 __weak_alias(strlcat
, _strlcat
)
44 #include <lib/libkern/libkern.h>
45 #endif /* !_KERNEL && !_STANDALONE */
49 * Appends src to string dst of size siz (unlike strncat, siz is the
50 * full size of dst, not space left). At most siz-1 characters
51 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
52 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
53 * If retval >= siz, truncation occurred.
56 strlcat(char *dst
, const char *src
, size_t siz
)
64 /* Find the end of dst and adjust bytes left but don't go past end */
65 while (n
-- != 0 && *d
!= '\0')
71 return(dlen
+ strlen(s
));
81 return(dlen
+ (s
- src
)); /* count does not include NUL */
85 * Find length of string in dst (maxing out at siz).
87 size_t dlen
= strnlen(dst
, siz
);
90 * Copy src into any remaining space in dst (truncating if needed).
91 * Note strlcpy(dst, src, 0) returns strlen(src).
93 return dlen
+ strlcpy(dst
+ dlen
, src
, siz
- dlen
);