1 /* $OpenBSD: strlcpy.c,v 1.10 2005/08/08 08:05:37 espie Exp $ */ 2 3 /* 4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */ 20 21 #include "includes.h" 22 #ifndef HAVE_STRLCPY 23 24 #include <sys/types.h> 25 #include <string.h> 26 27 /* 28 * Copy src to string dst of size siz. At most siz-1 characters 29 * will be copied. Always NUL terminates (unless siz == 0). 30 * Returns strlen(src); if retval >= siz, truncation occurred. 31 */ 32 size_t 33 strlcpy(char *dst, const char *src, size_t siz) 34 { 35 char *d = dst; 36 const char *s = src; 37 size_t n = siz; 38 39 /* Copy as many bytes as will fit */ 40 if (n != 0 && --n != 0) { 41 do { 42 if ((*d++ = *s++) == 0) 43 break; 44 } while (--n != 0); 45 } 46 47 /* Not enough room in dst, add NUL and traverse rest of src */ 48 if (n == 0) { 49 if (siz != 0) 50 *d = '\0'; /* NUL-terminate dst */ 51 while (*s++) 52 ; 53 } 54 55 return(s - src - 1); /* count does not include NUL */ 56 } 57 58 #endif /* !HAVE_STRLCPY */ 59