1/* $NetBSD$ */ 2 3/* 4 * Copyright (c) 1997-2014 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Jan-Simon Pendry at Imperial College, London. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * 38 * File: am-utils/libamu/strlcat.c 39 * 40 */ 41 42#ifdef HAVE_CONFIG_H 43# include <config.h> 44#endif /* HAVE_CONFIG_H */ 45#include <am_defs.h> 46#include <amu.h> 47 48/* 49 * Implementation of strlcat(3) from OpenBSD/NetBSD. 50 */ 51 52/* 53 * Appends src to string dst of size siz (unlike strncat, siz is the 54 * full size of dst, not space left). At most siz-1 characters 55 * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 56 * Returns strlen(src) + MIN(siz, strlen(initial dst)). 57 * If retval >= siz, truncation occurred. 58 */ 59size_t 60strlcat(char *dst, const char *src, size_t siz) 61{ 62 char *d = dst; 63 const char *s = src; 64 size_t n = siz; 65 size_t dlen; 66 67 /* Find the end of dst and adjust bytes left but don't go past end */ 68 while (n-- != 0 && *d != '\0') 69 d++; 70 dlen = d - dst; 71 n = siz - dlen; 72 73 if (n == 0) 74 return(dlen + strlen(s)); 75 while (*s != '\0') { 76 if (n != 1) { 77 *d++ = *s; 78 n--; 79 } 80 s++; 81 } 82 *d = '\0'; 83 84 return(dlen + (s - src)); /* count does not include NUL */ 85} 86