1b6cee71dSXin LI /* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */ 2b6cee71dSXin LI 3b6cee71dSXin LI /* 4b6cee71dSXin LI * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5b6cee71dSXin LI * 6b6cee71dSXin LI * Permission to use, copy, modify, and distribute this software for any 7b6cee71dSXin LI * purpose with or without fee is hereby granted, provided that the above 8b6cee71dSXin LI * copyright notice and this permission notice appear in all copies. 9b6cee71dSXin LI * 10b6cee71dSXin LI * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11b6cee71dSXin LI * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12b6cee71dSXin LI * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13b6cee71dSXin LI * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14b6cee71dSXin LI * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15b6cee71dSXin LI * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16b6cee71dSXin LI * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17b6cee71dSXin LI */ 18b6cee71dSXin LI 19b6cee71dSXin LI /* OPENBSD ORIGINAL: lib/libc/string/strlcat.c */ 20b6cee71dSXin LI #include "file.h" 21*a2dfb722SXin LI #ifndef lint 22*a2dfb722SXin LI FILE_RCSID("@(#)$File: strlcat.c,v 1.3 2022/09/13 18:46:07 christos Exp $") 23*a2dfb722SXin LI #endif 24b6cee71dSXin LI 25b6cee71dSXin LI #include <sys/types.h> 26b6cee71dSXin LI #include <string.h> 27b6cee71dSXin LI 28b6cee71dSXin LI /* 29b6cee71dSXin LI * Appends src to string dst of size siz (unlike strncat, siz is the 30b6cee71dSXin LI * full size of dst, not space left). At most siz-1 characters 31b6cee71dSXin LI * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 32b6cee71dSXin LI * Returns strlen(src) + MIN(siz, strlen(initial dst)). 33b6cee71dSXin LI * If retval >= siz, truncation occurred. 34b6cee71dSXin LI */ 35b6cee71dSXin LI size_t 36b6cee71dSXin LI strlcat(char *dst, const char *src, size_t siz) 37b6cee71dSXin LI { 38b6cee71dSXin LI char *d = dst; 39b6cee71dSXin LI const char *s = src; 40b6cee71dSXin LI size_t n = siz; 41b6cee71dSXin LI size_t dlen; 42b6cee71dSXin LI 43b6cee71dSXin LI /* Find the end of dst and adjust bytes left but don't go past end */ 44b6cee71dSXin LI while (n-- != 0 && *d != '\0') 45b6cee71dSXin LI d++; 46b6cee71dSXin LI dlen = d - dst; 47b6cee71dSXin LI n = siz - dlen; 48b6cee71dSXin LI 49b6cee71dSXin LI if (n == 0) 50b6cee71dSXin LI return(dlen + strlen(s)); 51b6cee71dSXin LI while (*s != '\0') { 52b6cee71dSXin LI if (n != 1) { 53b6cee71dSXin LI *d++ = *s; 54b6cee71dSXin LI n--; 55b6cee71dSXin LI } 56b6cee71dSXin LI s++; 57b6cee71dSXin LI } 58b6cee71dSXin LI *d = '\0'; 59b6cee71dSXin LI 60b6cee71dSXin LI return(dlen + (s - src)); /* count does not include NUL */ 61b6cee71dSXin LI } 62