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 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