1bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */ 2bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 3bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* 4bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * 6bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Permission to use, copy, modify, and distribute this software for any 7bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * purpose with or without fee is hereby granted, provided that the above 8bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * copyright notice and this permission notice appear in all copies. 9bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * 10bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 18bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 19bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */ 20bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 21bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include "includes.h" 22bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#ifndef HAVE_STRLCAT 23bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 24bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <sys/types.h> 25bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#include <string.h> 26bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 27bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman/* 28bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Appends src to string dst of size siz (unlike strncat, siz is the 29bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * full size of dst, not space left). At most siz-1 characters 30bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 31bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * Returns strlen(src) + MIN(siz, strlen(initial dst)). 32bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman * If retval >= siz, truncation occurred. 33bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman */ 34bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmansize_t 35bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartmanstrlcat(char *dst, const char *src, size_t siz) 36bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman{ 37bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman char *d = dst; 38bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman const char *s = src; 39bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman size_t n = siz; 40bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman size_t dlen; 41bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 42bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman /* Find the end of dst and adjust bytes left but don't go past end */ 43bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman while (n-- != 0 && *d != '\0') 44bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman d++; 45bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman dlen = d - dst; 46bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman n = siz - dlen; 47bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 48bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (n == 0) 49bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return(dlen + strlen(s)); 50bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman while (*s != '\0') { 51bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman if (n != 1) { 52bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman *d++ = *s; 53bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman n--; 54bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 55bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman s++; 56bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman } 57bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman *d = '\0'; 58bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 59bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman return(dlen + (s - src)); /* count does not include NUL */ 60bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman} 61bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman 62bd77cf78387b72b7b3ea870459077672bf75c3b5Greg Hartman#endif /* !HAVE_STRLCAT */ 63