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