/* $NetBSD: strlcat.c,v 1.5 2024/11/01 21:11:37 riastradh Exp $ */
/* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */
/*
* Copyright (c) 1998 Todd C. Miller <
[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
* FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#if !defined(_KERNEL) && !defined(_STANDALONE)
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: strlcat.c,v 1.5 2024/11/01 21:11:37 riastradh Exp $");
#endif /* LIBC_SCCS and not lint */
#ifdef _LIBC
#include "namespace.h"
#endif
#include <sys/types.h>
#include <assert.h>
#include <string.h>
#ifdef _LIBC
# ifdef __weak_alias
__weak_alias(strlcat, _strlcat)
# endif
#endif
#else
#include <lib/libkern/libkern.h>
#endif /* !_KERNEL && !_STANDALONE */
#if !HAVE_STRLCAT
/*
* Appends src to string dst of size siz (unlike strncat, siz is the
* full size of dst, not space left). At most siz-1 characters
* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
* Returns strlen(src) + MIN(siz, strlen(initial dst)).
* If retval >= siz, truncation occurred.
*/
size_t
strlcat(char *__restrict dst, const char *__restrict src, size_t siz)
{
#if 1
char *d = dst;
const char *s = src;
size_t n = siz;
size_t dlen;
_DIAGASSERT(dst != NULL);
_DIAGASSERT(src != NULL);
/* Find the end of dst and adjust bytes left but don't go past end */
while (n-- != 0 && *d != '\0')
d++;
dlen = d - dst;
n = siz - dlen;
if (n == 0)
return(dlen + strlen(s));
while (*s != '\0') {
if (n != 1) {
*d++ = *s;
n--;
}
s++;
}
*d = '\0';
return(dlen + (s - src)); /* count does not include NUL */
#else
_DIAGASSERT(dst != NULL);
_DIAGASSERT(src != NULL);
/*
* Find length of string in dst (maxing out at siz).
*/
size_t dlen = strnlen(dst, siz);
/*
* Copy src into any remaining space in dst (truncating if needed).
* Note strlcpy(dst, src, 0) returns strlen(src).
*/
return dlen + strlcpy(dst + dlen, src, siz - dlen);
#endif
}
#endif
