00001 /* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */ 00002 00003 /* 00004 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 00005 * 00006 * Permission to use, copy, modify, and distribute this software for any 00007 * purpose with or without fee is hereby granted, provided that the above 00008 * copyright notice and this permission notice appear in all copies. 00009 * 00010 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 00011 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 00012 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 00013 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 00014 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 00015 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 00016 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 00017 */ 00018 00019 #ifdef HAVE_CONFIG_H 00020 #include "config.h" 00021 #endif 00022 00023 #ifndef HAVE_STRLCPY 00024 00025 #include <sys/types.h> 00026 #include <string.h> 00027 #include "strlcpycat.h" 00028 00029 /* 00030 * Copy src to string dst of size siz. At most siz-1 characters 00031 * will be copied. Always NUL terminates (unless siz == 0). 00032 * Returns strlen(src); if retval >= siz, truncation occurred. 00033 */ 00034 size_t 00035 strlcpy(char *dst, const char *src, size_t siz) 00036 { 00037 char *d = dst; 00038 const char *s = src; 00039 size_t n = siz; 00040 00041 /* Copy as many bytes as will fit */ 00042 if (n != 0 && --n != 0) { 00043 do { 00044 if ((*d++ = *s++) == 0) 00045 break; 00046 } while (--n != 0); 00047 } 00048 00049 /* Not enough room in dst, add NUL and traverse rest of src */ 00050 if (n == 0) { 00051 if (siz != 0) 00052 *d = '\0'; /* NUL-terminate dst */ 00053 while (*s++) 00054 ; 00055 } 00056 00057 return(s - src - 1); /* count does not include NUL */ 00058 } 00059 00060 #endif