1b0104773SPascal Brand /* This file is copied from newlib-1.19 */ 2b0104773SPascal Brand 3b0104773SPascal Brand /* $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $ */ 4b0104773SPascal Brand 5b0104773SPascal Brand /* 6b0104773SPascal Brand * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 7b0104773SPascal Brand * All rights reserved. 8b0104773SPascal Brand * 9b0104773SPascal Brand * Redistribution and use in source and binary forms, with or without 10b0104773SPascal Brand * modification, are permitted provided that the following conditions 11b0104773SPascal Brand * are met: 12b0104773SPascal Brand * 1. Redistributions of source code must retain the above copyright 13b0104773SPascal Brand * notice, this list of conditions and the following disclaimer. 14b0104773SPascal Brand * 2. Redistributions in binary form must reproduce the above copyright 15b0104773SPascal Brand * notice, this list of conditions and the following disclaimer in the 16b0104773SPascal Brand * documentation and/or other materials provided with the distribution. 17b0104773SPascal Brand * 3. The name of the author may not be used to endorse or promote products 18b0104773SPascal Brand * derived from this software without specific prior written permission. 19b0104773SPascal Brand * 20b0104773SPascal Brand * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 21b0104773SPascal Brand * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 22b0104773SPascal Brand * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23b0104773SPascal Brand * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24b0104773SPascal Brand * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25b0104773SPascal Brand * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26b0104773SPascal Brand * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27b0104773SPascal Brand * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28b0104773SPascal Brand * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29b0104773SPascal Brand * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30b0104773SPascal Brand */ 31b0104773SPascal Brand 32b0104773SPascal Brand #if defined(LIBC_SCCS) && !defined(lint) 33b0104773SPascal Brand static char *rcsid = 34b0104773SPascal Brand "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $"; 35b0104773SPascal Brand #endif /* LIBC_SCCS and not lint */ 36b0104773SPascal Brand 37*ec219598SPascal Brand #include <types_ext.h> 38b0104773SPascal Brand #include <string_ext.h> 39b0104773SPascal Brand /* #include <string.h> */ 40b0104773SPascal Brand 41b0104773SPascal Brand size_t strlen(const char *s); 42b0104773SPascal Brand /* 43b0104773SPascal Brand * Appends src to string dst of size siz (unlike strncat, siz is the 44b0104773SPascal Brand * full size of dst, not space left). At most siz-1 characters 45b0104773SPascal Brand * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 46b0104773SPascal Brand * Returns strlen(src) + MIN(siz, strlen(initial dst)). 47b0104773SPascal Brand * If retval >= siz, truncation occurred. 48b0104773SPascal Brand */ 49b0104773SPascal Brand size_t strlcat(char *dst, const char *src, size_t siz) 50b0104773SPascal Brand { 51b0104773SPascal Brand register char *d = dst; 52b0104773SPascal Brand register const char *s = src; 53b0104773SPascal Brand register size_t n = siz; 54b0104773SPascal Brand size_t dlen; 55b0104773SPascal Brand 56b0104773SPascal Brand /* Find the end of dst and adjust bytes left but don't go past end */ 57b0104773SPascal Brand while (n-- != 0 && *d != '\0') 58b0104773SPascal Brand d++; 59b0104773SPascal Brand dlen = d - dst; 60b0104773SPascal Brand n = siz - dlen; 61b0104773SPascal Brand 62b0104773SPascal Brand if (n == 0) 63b0104773SPascal Brand return dlen + strlen(s); 64b0104773SPascal Brand 65b0104773SPascal Brand while (*s != '\0') { 66b0104773SPascal Brand if (n != 1) { 67b0104773SPascal Brand *d++ = *s; 68b0104773SPascal Brand n--; 69b0104773SPascal Brand } 70b0104773SPascal Brand s++; 71b0104773SPascal Brand } 72b0104773SPascal Brand *d = '\0'; 73b0104773SPascal Brand 74b0104773SPascal Brand return dlen + (s - src); /* count does not include NUL */ 75b0104773SPascal Brand } 76