1 /* $NetBSD: strlcat.c,v 1.1.1.2 2009/03/20 20:26:56 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 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. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgment: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * 42 * File: am-utils/libamu/strlcat.c 43 * 44 */ 45 46 #ifdef HAVE_CONFIG_H 47 # include <config.h> 48 #endif /* HAVE_CONFIG_H */ 49 #include <am_defs.h> 50 #include <amu.h> 51 52 /* 53 * Implementation of strlcat(3) from OpenBSD/NetBSD. 54 */ 55 56 /* 57 * Appends src to string dst of size siz (unlike strncat, siz is the 58 * full size of dst, not space left). At most siz-1 characters 59 * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 60 * Returns strlen(src) + MIN(siz, strlen(initial dst)). 61 * If retval >= siz, truncation occurred. 62 */ 63 size_t 64 strlcat(char *dst, const char *src, size_t siz) 65 { 66 char *d = dst; 67 const char *s = src; 68 size_t n = siz; 69 size_t dlen; 70 71 /* Find the end of dst and adjust bytes left but don't go past end */ 72 while (n-- != 0 && *d != '\0') 73 d++; 74 dlen = d - dst; 75 n = siz - dlen; 76 77 if (n == 0) 78 return(dlen + strlen(s)); 79 while (*s != '\0') { 80 if (n != 1) { 81 *d++ = *s; 82 n--; 83 } 84 s++; 85 } 86 *d = '\0'; 87 88 return(dlen + (s - src)); /* count does not include NUL */ 89 } 90