strlcat.c revision 124208
113394Swpaul/* $OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $ */ 213394Swpaul 313394Swpaul/* 413394Swpaul * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 513394Swpaul * 613394Swpaul * Permission to use, copy, modify, and distribute this software for any 713394Swpaul * purpose with or without fee is hereby granted, provided that the above 813394Swpaul * copyright notice and this permission notice appear in all copies. 913394Swpaul * 1013394Swpaul * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 1113394Swpaul * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 1213394Swpaul * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 1313394Swpaul * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 1413394Swpaul * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 1513394Swpaul * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 1613394Swpaul * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 1713394Swpaul */ 1813394Swpaul 1913394Swpaul#include "includes.h" 2013394Swpaul#ifndef HAVE_STRLCAT 2113394Swpaul 2213394Swpaul#if defined(LIBC_SCCS) && !defined(lint) 2313394Swpaulstatic char *rcsid = "$OpenBSD: strlcat.c,v 1.11 2003/06/17 21:56:24 millert Exp $"; 2413394Swpaul#endif /* LIBC_SCCS and not lint */ 2513394Swpaul 2613394Swpaul#include <sys/types.h> 2713394Swpaul#include <string.h> 2813394Swpaul 2913394Swpaul/* 3013394Swpaul * Appends src to string dst of size siz (unlike strncat, siz is the 3113394Swpaul * full size of dst, not space left). At most siz-1 characters 3213394Swpaul * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 33114601Sobrien * Returns strlen(src) + MIN(siz, strlen(initial dst)). 34114601Sobrien * If retval >= siz, truncation occurred. 3530911Scharnier */ 3630911Scharniersize_t 3730911Scharnierstrlcat(char *dst, const char *src, size_t siz) 3813394Swpaul{ 3913394Swpaul register char *d = dst; 4013394Swpaul register const char *s = src; 41161262Sru register size_t n = siz; 4213394Swpaul size_t dlen; 4330911Scharnier 4413394Swpaul /* Find the end of dst and adjust bytes left but don't go past end */ 4513394Swpaul while (n-- != 0 && *d != '\0') 4613394Swpaul d++; 4713394Swpaul dlen = d - dst; 4813394Swpaul n = siz - dlen; 4913394Swpaul 5013394Swpaul if (n == 0) 5113394Swpaul return(dlen + strlen(s)); 5213394Swpaul while (*s != '\0') { 5313394Swpaul if (n != 1) { 5413394Swpaul *d++ = *s; 5513394Swpaul n--; 5613394Swpaul } 5713394Swpaul s++; 5813394Swpaul } 5913394Swpaul *d = '\0'; 6013394Swpaul 6113394Swpaul return(dlen + (s - src)); /* count does not include NUL */ 6213394Swpaul} 6313394Swpaul 64161262Sru#endif /* !HAVE_STRLCAT */ 6513394Swpaul