1/*	$NetBSD: strlcpy.c,v 1.1.1.2 2009/03/20 20:26:56 christos Exp $	*/
2
3/*
4 * Copyright (c) 1997-2009 Erez Zadok
5 * Copyright (c) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 *    notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 *    notice, this list of conditions and the following disclaimer in the
20 *    documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 *    must display the following acknowledgment:
23 *      This product includes software developed by the University of
24 *      California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 *    may be used to endorse or promote products derived from this software
27 *    without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 *
42 * File: am-utils/libamu/strlcpy.c
43 *
44 */
45
46#ifdef HAVE_CONFIG_H
47# include <config.h>
48#endif /* HAVE_CONFIG_H */
49#include <am_defs.h>
50#include <amu.h>
51
52/*
53 * Implementation of strlcpy(3) from OpenBSD/NetBSD.
54 */
55
56/*
57 * Copy src to string dst of size siz.  At most siz-1 characters
58 * will be copied.  Always NUL terminates (unless siz == 0).
59 * Returns strlen(src); if retval >= siz, truncation occurred.
60 */
61size_t
62strlcpy(char *dst, const char *src, size_t siz)
63{
64  char *d = dst;
65  const char *s = src;
66  size_t n = siz;
67
68
69  /* Copy as many bytes as will fit */
70  if (n != 0 && --n != 0) {
71    do {
72      if ((*d++ = *s++) == 0)
73	break;
74    } while (--n != 0);
75  }
76
77  /* Not enough room in dst, add NUL and traverse rest of src */
78  if (n == 0) {
79    if (siz != 0)
80      *d = '\0';		/* NUL-terminate dst */
81    while (*s++)
82      ;
83  }
84
85  return(s - src - 1);	/* count does not include NUL */
86}
87