1 /* 2 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * dollar OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp dollar 28 */ 29 30 /* 31 * Appends src to string dst of size siz (unlike strncat, siz is the 32 * full size of dst, not space left). At most siz-1 characters 33 * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 34 * Returns strlen(src) + MIN(siz, strlen(initial dst)). 35 * If retval >= siz, truncation occurred. 36 */ 37 static size_t 38 strlcat(dst, src, siz) 39 char *dst; 40 const char *src; 41 size_t siz; 42 { 43 char *d = dst; 44 const char *s = src; 45 size_t n = siz; 46 size_t dlen; 47 48 /* Find the end of dst and adjust bytes left but don't go past end */ 49 while (n-- != 0 && *d != '\0') 50 d++; 51 dlen = d - dst; 52 n = siz - dlen; 53 54 if (n == 0) 55 return(dlen + strlen(s)); 56 while (*s != '\0') { 57 if (n != 1) { 58 *d++ = *s; 59 n--; 60 } 61 s++; 62 } 63 *d = '\0'; 64 65 return(dlen + (s - src)); /* count does not include NUL */ 66 } 67