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 1/*	$OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $	*/
 2
 3/*
 4 * Copyright (c) 1998, 2015 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#include <string.h>
20#include <sys/types.h>
21
22#include "compat.h"
23
24/*
25 * Copy string src to buffer dst of size dsize.  At most dsize-1
26 * chars will be copied.  Always NUL terminates (unless dsize == 0).
27 * Returns strlen(src); if retval >= dsize, truncation occurred.
28 */
29size_t strlcpy(char *dst, const char *src, size_t dsize) {
30  const char *osrc = src;
31  size_t nleft = dsize;
32
33  /* Copy as many bytes as will fit. */
34  if (nleft != 0) {
35    while (--nleft != 0) {
36      if ((*dst++ = *src++) == '\0')
37        break;
38    }
39  }
40
41  /* Not enough room in dst, add NUL and traverse rest of src. */
42  if (nleft == 0) {
43    if (dsize != 0)
44      *dst = '\0'; /* NUL-terminate dst */
45    while (*src++)
46      ;
47  }
48
49  return (src - osrc - 1); /* count does not include NUL */
50}