1 /* $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller (at) courtesan.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 36 #ifdef HAVE_CONFIG_H 37 #include "config.h" 38 #endif /* HAVE_CONFIG_H */ 39 40 #ifndef HAVE_STRLCPY 41 #include "strlcpy-internal.h" 42 43 /* 44 * Copy src to string dst of size siz. At most siz-1 characters 45 * will be copied. Always NUL terminates (unless siz == 0). 46 * Returns strlen(src); if retval >= siz, truncation occurred. 47 */ 48 size_t 49 _event_strlcpy(dst, src, siz) 50 char *dst; 51 const char *src; 52 size_t siz; 53 { 54 register char *d = dst; 55 register const char *s = src; 56 register size_t n = siz; 57 58 /* Copy as many bytes as will fit */ 59 if (n != 0 && --n != 0) { 60 do { 61 if ((*d++ = *s++) == 0) 62 break; 63 } while (--n != 0); 64 } 65 66 /* Not enough room in dst, add NUL and traverse rest of src */ 67 if (n == 0) { 68 if (siz != 0) 69 *d = '\0'; /* NUL-terminate dst */ 70 while (*s++) 71 ; 72 } 73 74 return(s - src - 1); /* count does not include NUL */ 75 } 76 #endif 77
