1 // SPDX-License-Identifier: CDDL-1.0
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or https://opensource.org/licenses/CDDL-1.0.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /*
24 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 */
27 #ifndef HAVE_STRLCAT
28
29 #include <string.h>
30 #include <sys/types.h>
31
32 /*
33 * Appends src to the dstsize buffer at dst. The append will never
34 * overflow the destination buffer and the buffer will always be null
35 * terminated. Never reference beyond &dst[dstsize-1] when computing
36 * the length of the pre-existing string.
37 */
38
39 size_t
strlcat(char * dst,const char * src,size_t dstsize)40 strlcat(char *dst, const char *src, size_t dstsize)
41 {
42 char *df = dst;
43 size_t left = dstsize;
44 size_t l1;
45 size_t l2 = strlen(src);
46 size_t copied;
47
48 while (left-- != 0 && *df != '\0')
49 df++;
50 l1 = df - dst;
51 if (dstsize == l1)
52 return (l1 + l2);
53
54 copied = l1 + l2 >= dstsize ? dstsize - l1 - 1 : l2;
55 (void) memcpy(dst + l1, src, copied);
56 dst[l1+copied] = '\0';
57
58 return (l1 + l2);
59 }
60
61 #endif
62