1192348Sdelphij/* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */ 2192348Sdelphij 3192348Sdelphij/* 4192348Sdelphij * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5192348Sdelphij * 6192348Sdelphij * Permission to use, copy, modify, and distribute this software for any 7192348Sdelphij * purpose with or without fee is hereby granted, provided that the above 8192348Sdelphij * copyright notice and this permission notice appear in all copies. 9192348Sdelphij * 10192348Sdelphij * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11192348Sdelphij * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12192348Sdelphij * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13192348Sdelphij * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14192348Sdelphij * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15192348Sdelphij * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16192348Sdelphij * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17192348Sdelphij */ 18192348Sdelphij 19192348Sdelphij/* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */ 20192348Sdelphij#include "file.h" 21192348Sdelphij 22192348Sdelphij#include <sys/types.h> 23192348Sdelphij#include <string.h> 24192348Sdelphij 25192348Sdelphij/* 26192348Sdelphij * Appends src to string dst of size siz (unlike strncat, siz is the 27192348Sdelphij * full size of dst, not space left). At most siz-1 characters 28192348Sdelphij * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 29192348Sdelphij * Returns strlen(src) + MIN(siz, strlen(initial dst)). 30192348Sdelphij * If retval >= siz, truncation occurred. 31192348Sdelphij */ 32192348Sdelphijsize_t 33192348Sdelphijstrlcat(char *dst, const char *src, size_t siz) 34192348Sdelphij{ 35192348Sdelphij char *d = dst; 36192348Sdelphij const char *s = src; 37192348Sdelphij size_t n = siz; 38192348Sdelphij size_t dlen; 39192348Sdelphij 40192348Sdelphij /* Find the end of dst and adjust bytes left but don't go past end */ 41192348Sdelphij while (n-- != 0 && *d != '\0') 42192348Sdelphij d++; 43192348Sdelphij dlen = d - dst; 44192348Sdelphij n = siz - dlen; 45192348Sdelphij 46192348Sdelphij if (n == 0) 47192348Sdelphij return(dlen + strlen(s)); 48192348Sdelphij while (*s != '\0') { 49192348Sdelphij if (n != 1) { 50192348Sdelphij *d++ = *s; 51192348Sdelphij n--; 52192348Sdelphij } 53192348Sdelphij s++; 54192348Sdelphij } 55192348Sdelphij *d = '\0'; 56192348Sdelphij 57192348Sdelphij return(dlen + (s - src)); /* count does not include NUL */ 58192348Sdelphij} 59