1*0Sstevel@tonic-gate /* $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $ */ 2*0Sstevel@tonic-gate 3*0Sstevel@tonic-gate /* 4*0Sstevel@tonic-gate * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5*0Sstevel@tonic-gate * All rights reserved. 6*0Sstevel@tonic-gate * 7*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 8*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 9*0Sstevel@tonic-gate * are met: 10*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 11*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 12*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 13*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 14*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 15*0Sstevel@tonic-gate * 3. The name of the author may not be used to endorse or promote products 16*0Sstevel@tonic-gate * derived from this software without specific prior written permission. 17*0Sstevel@tonic-gate * 18*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19*0Sstevel@tonic-gate * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20*0Sstevel@tonic-gate * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21*0Sstevel@tonic-gate * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22*0Sstevel@tonic-gate * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23*0Sstevel@tonic-gate * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24*0Sstevel@tonic-gate * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25*0Sstevel@tonic-gate * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26*0Sstevel@tonic-gate * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27*0Sstevel@tonic-gate * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28*0Sstevel@tonic-gate */ 29*0Sstevel@tonic-gate 30*0Sstevel@tonic-gate #include "includes.h" 31*0Sstevel@tonic-gate #ifndef HAVE_STRLCAT 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint) 34*0Sstevel@tonic-gate static char *rcsid = "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $"; 35*0Sstevel@tonic-gate #endif /* LIBC_SCCS and not lint */ 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate #include <sys/types.h> 38*0Sstevel@tonic-gate #include <string.h> 39*0Sstevel@tonic-gate #include "strlcat.h" 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate /* 42*0Sstevel@tonic-gate * Appends src to string dst of size siz (unlike strncat, siz is the 43*0Sstevel@tonic-gate * full size of dst, not space left). At most siz-1 characters 44*0Sstevel@tonic-gate * will be copied. Always NUL terminates (unless siz <= strlen(dst)). 45*0Sstevel@tonic-gate * Returns strlen(src) + MIN(siz, strlen(initial dst)). 46*0Sstevel@tonic-gate * If retval >= siz, truncation occurred. 47*0Sstevel@tonic-gate */ 48*0Sstevel@tonic-gate size_t 49*0Sstevel@tonic-gate strlcat(dst, src, siz) 50*0Sstevel@tonic-gate char *dst; 51*0Sstevel@tonic-gate const char *src; 52*0Sstevel@tonic-gate size_t siz; 53*0Sstevel@tonic-gate { 54*0Sstevel@tonic-gate register char *d = dst; 55*0Sstevel@tonic-gate register const char *s = src; 56*0Sstevel@tonic-gate register size_t n = siz; 57*0Sstevel@tonic-gate size_t dlen; 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate /* Find the end of dst and adjust bytes left but don't go past end */ 60*0Sstevel@tonic-gate while (n-- != 0 && *d != '\0') 61*0Sstevel@tonic-gate d++; 62*0Sstevel@tonic-gate dlen = d - dst; 63*0Sstevel@tonic-gate n = siz - dlen; 64*0Sstevel@tonic-gate 65*0Sstevel@tonic-gate if (n == 0) 66*0Sstevel@tonic-gate return(dlen + strlen(s)); 67*0Sstevel@tonic-gate while (*s != '\0') { 68*0Sstevel@tonic-gate if (n != 1) { 69*0Sstevel@tonic-gate *d++ = *s; 70*0Sstevel@tonic-gate n--; 71*0Sstevel@tonic-gate } 72*0Sstevel@tonic-gate s++; 73*0Sstevel@tonic-gate } 74*0Sstevel@tonic-gate *d = '\0'; 75*0Sstevel@tonic-gate 76*0Sstevel@tonic-gate return(dlen + (s - src)); /* count does not include NUL */ 77*0Sstevel@tonic-gate } 78*0Sstevel@tonic-gate 79*0Sstevel@tonic-gate #endif /* !HAVE_STRLCAT */ 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 82