1ba840c78SXin LI /* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */ 2a41df9e3SWarner Losh 3a41df9e3SWarner Losh /* 4a41df9e3SWarner Losh * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5a41df9e3SWarner Losh * 6ba840c78SXin LI * Permission to use, copy, modify, and distribute this software for any 7ba840c78SXin LI * purpose with or without fee is hereby granted, provided that the above 8ba840c78SXin LI * copyright notice and this permission notice appear in all copies. 9a41df9e3SWarner Losh * 10ba840c78SXin LI * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11ba840c78SXin LI * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12ba840c78SXin LI * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13ba840c78SXin LI * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14ba840c78SXin LI * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15ba840c78SXin LI * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16ba840c78SXin LI * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17a41df9e3SWarner Losh */ 18a41df9e3SWarner Losh 19de5fe5d5SDavid E. O'Brien #include <sys/cdefs.h> 20de5fe5d5SDavid E. O'Brien __FBSDID("$FreeBSD$"); 21a41df9e3SWarner Losh 22a41df9e3SWarner Losh #include <sys/types.h> 23a41df9e3SWarner Losh #include <string.h> 24a41df9e3SWarner Losh 25a41df9e3SWarner Losh /* 26a41df9e3SWarner Losh * Appends src to string dst of size siz (unlike strncat, siz is the 27a41df9e3SWarner Losh * full size of dst, not space left). At most siz-1 characters 28420923e9SChris D. Faulhaber * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 296979f76fSKris Kennaway * Returns strlen(src) + MIN(siz, strlen(initial dst)). 306979f76fSKris Kennaway * If retval >= siz, truncation occurred. 31a41df9e3SWarner Losh */ 326979f76fSKris Kennaway size_t 33ba840c78SXin LI strlcat(char *dst, const char *src, size_t siz) 34a41df9e3SWarner Losh { 358fb3f3f6SDavid E. O'Brien char *d = dst; 368fb3f3f6SDavid E. O'Brien const char *s = src; 378fb3f3f6SDavid E. O'Brien size_t n = siz; 38a41df9e3SWarner Losh size_t dlen; 39a41df9e3SWarner Losh 40d64292d2SWarner Losh /* Find the end of dst and adjust bytes left but don't go past end */ 41420923e9SChris D. Faulhaber while (n-- != 0 && *d != '\0') 42a41df9e3SWarner Losh d++; 43a41df9e3SWarner Losh dlen = d - dst; 44d64292d2SWarner Losh n = siz - dlen; 45a41df9e3SWarner Losh 46a41df9e3SWarner Losh if (n == 0) 47a41df9e3SWarner Losh return(dlen + strlen(s)); 48a41df9e3SWarner Losh while (*s != '\0') { 49a41df9e3SWarner Losh if (n != 1) { 50a41df9e3SWarner Losh *d++ = *s; 51a41df9e3SWarner Losh n--; 52a41df9e3SWarner Losh } 53a41df9e3SWarner Losh s++; 54a41df9e3SWarner Losh } 55a41df9e3SWarner Losh *d = '\0'; 56a41df9e3SWarner Losh 57a41df9e3SWarner Losh return(dlen + (s - src)); /* count does not include NUL */ 58a41df9e3SWarner Losh } 59