78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/* $NetBSD: strlcat.c,v 1.2 2006/03/30 20:37:51 christos Exp $ */
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/* $OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp $ */
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/*
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* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
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* FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: strlcat.c,v 1.2 2006/03/30 20:37:51 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <assert.h>
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#include <string.h>
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#ifdef _LIBC
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# ifdef __weak_alias
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__weak_alias(strlcat, _strlcat)
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# endif
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#endif
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#if !HAVE_STRLCAT
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/*
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* Appends src to string dst of size siz (unlike strncat, siz is the
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* full size of dst, not space left). At most siz-1 characters
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* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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* Returns strlen(src) + MIN(siz, strlen(initial dst)).
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* If retval >= siz, truncation occurred.
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*/
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size_t
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strlcat(dst, src, siz)
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char *dst;
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const char *src;
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size_t siz;
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{
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char *d = dst;
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const char *s = src;
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size_t n = siz;
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size_t dlen;
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_DIAGASSERT(dst != NULL);
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_DIAGASSERT(src != NULL);
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/* Find the end of dst and adjust bytes left but don't go past end */
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while (n-- != 0 && *d != '\0')
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d++;
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dlen = d - dst;
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n = siz - dlen;
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if (n == 0)
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return(dlen + strlen(s));
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while (*s != '\0') {
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if (n != 1) {
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*d++ = *s;
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n--;
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}
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s++;
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}
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*d = '\0';
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return(dlen + (s - src)); /* count does not include NUL */
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}
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#endif
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