1 /* 2 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * dollar OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp dollar 28 */ 29 30 /* 31 * Copy src to string dst of size siz. At most siz-1 characters 32 * will be copied. Always NUL terminates (unless siz == 0). 33 * Returns strlen(src); if retval >= siz, truncation occurred. 34 */ 35 static size_t 36 strlcpy(dst, src, siz) 37 char *dst; 38 const char *src; 39 size_t siz; 40 { 41 char *d = dst; 42 const char *s = src; 43 size_t n = siz; 44 45 /* Copy as many bytes as will fit */ 46 if (n != 0 && --n != 0) { 47 do { 48 if ((*d++ = *s++) == 0) 49 break; 50 } while (--n != 0); 51 } 52 53 /* Not enough room in dst, add NUL and traverse rest of src */ 54 if (n == 0) { 55 if (siz != 0) 56 *d = '\0'; /* NUL-terminate dst */ 57 while (*s++) 58 ; 59 } 60 61 return(s - src - 1); /* count does not include NUL */ 62 } 63