1/* $NetBSD: strlcat.c,v 1.4 2005/05/16 06:55:48 lukem Exp $ */ 2/* from NetBSD: strlcat.c,v 1.16 2003/10/27 00:12:42 lukem Exp */ 3/* from OpenBSD: strlcat.c,v 1.10 2003/04/12 21:56:39 millert Exp */ 4 5/* 6 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL 13 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 14 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE 15 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 17 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 18 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21#include "tnftp.h" 22 23/* 24 * Appends src to string dst of size siz (unlike strncat, siz is the 25 * full size of dst, not space left). At most siz-1 characters 26 * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 27 * Returns strlen(src) + MIN(siz, strlen(initial dst)). 28 * If retval >= siz, truncation occurred. 29 */ 30size_t 31strlcat(char *dst, const char *src, size_t siz) 32{ 33 char *d = dst; 34 const char *s = src; 35 size_t n = siz; 36 size_t dlen; 37 38 /* Find the end of dst and adjust bytes left but don't go past end */ 39 while (n-- != 0 && *d != '\0') 40 d++; 41 dlen = d - dst; 42 n = siz - dlen; 43 44 if (n == 0) 45 return(dlen + strlen(s)); 46 while (*s != '\0') { 47 if (n != 1) { 48 *d++ = *s; 49 n--; 50 } 51 s++; 52 } 53 *d = '\0'; 54 55 return(dlen + (s - src)); /* count does not include NUL */ 56} 57