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