1 // SPDX-License-Identifier: BSD-3-Clause 2 /* This file is copied from newlib-1.19 */ 3 4 /* $OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $ */ 5 6 /* 7 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 23 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 24 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 27 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 30 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char *rcsid = 35 "$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <types_ext.h> 39 #include <string_ext.h> 40 41 /* 42 * Copy src to string dst of size siz. At most siz-1 characters 43 * will be copied. Always NUL terminates (unless siz == 0). 44 * Returns strlen(src); if retval >= siz, truncation occurred. 45 */ 46 size_t strlcpy(char *dst, const char *src, size_t siz) 47 { 48 register char *d = dst; 49 register const char *s = src; 50 register size_t n = siz; 51 52 /* Copy as many bytes as will fit */ 53 if (n != 0 && --n != 0) { 54 do { 55 if ((*d++ = *s++) == 0) 56 break; 57 } while (--n != 0); 58 } 59 60 /* Not enough room in dst, add NUL and traverse rest of src */ 61 if (n == 0) { 62 if (siz != 0) 63 *d = '\0'; /* NUL-terminate dst */ 64 while (*s++) 65 ; 66 } 67 68 return s - src - 1; /* count does not include NUL */ 69 } 70