00001 /* $OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert 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 #include "config.h" 00020 #ifndef HAVE_STRLCPY 00021 00022 #if defined(LIBC_SCCS) && !defined(lint) 00023 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $"; 00024 #endif /* LIBC_SCCS and not lint */ 00025 00026 #include <sys/types.h> 00027 #include <string.h> 00028 #include "misc.h" 00029 00030 /* 00031 * Copy src to string dst of size siz. At most siz-1 characters 00032 * will be copied. Always NUL terminates (unless siz == 0). 00033 * Returns strlen(src); if retval >= siz, truncation occurred. 00034 */ 00035 INTERNAL size_t 00036 strlcpy(char *dst, const char *src, size_t siz) 00037 { 00038 register char *d = dst; 00039 register const char *s = src; 00040 register size_t n = siz; 00041 00042 /* Copy as many bytes as will fit */ 00043 if (n != 0 && --n != 0) { 00044 do { 00045 if ((*d++ = *s++) == 0) 00046 break; 00047 } while (--n != 0); 00048 } 00049 00050 /* Not enough room in dst, add NUL and traverse rest of src */ 00051 if (n == 0) { 00052 if (siz != 0) 00053 *d = '\0'; /* NUL-terminate dst */ 00054 while (*s++) 00055 ; 00056 } 00057 00058 return(s - src - 1); /* count does not include NUL */ 00059 } 00060 00061 #endif 00062