1 /* OPENBSD ORIGINAL: lib/libc/string/strlcpy.c */ 2 3 /* $OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $ */ 4 5 /* 6 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include "includes.h" 22 #ifndef HAVE_STRLCPY 23 24 #if defined(LIBC_SCCS) && !defined(lint) 25 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $"; 26 #endif /* LIBC_SCCS and not lint */ 27 28 #include <sys/types.h> 29 #include <string.h> 30 31 /* 32 * Copy src to string dst of size siz. At most siz-1 characters 33 * will be copied. Always NUL terminates (unless siz == 0). 34 * Returns strlen(src); if retval >= siz, truncation occurred. 35 */ 36 size_t 37 strlcpy(char *dst, const char *src, size_t siz) 38 { 39 register char *d = dst; 40 register const char *s = src; 41 register size_t n = siz; 42 43 /* Copy as many bytes as will fit */ 44 if (n != 0 && --n != 0) { 45 do { 46 if ((*d++ = *s++) == 0) 47 break; 48 } while (--n != 0); 49 } 50 51 /* Not enough room in dst, add NUL and traverse rest of src */ 52 if (n == 0) { 53 if (siz != 0) 54 *d = '\0'; /* NUL-terminate dst */ 55 while (*s++) 56 ; 57 } 58 59 return(s - src - 1); /* count does not include NUL */ 60 } 61 62 #endif /* !HAVE_STRLCPY */ 63