/src/sudo/lib/util/strlcpy.c
Line | Count | Source |
1 | | /* $OpenBSD: strlcpy.c,v 1.12 2015/01/15 03:54:12 millert Exp $ */ |
2 | | |
3 | | /* |
4 | | * SPDX-License-Identifier: ISC |
5 | | * |
6 | | * Copyright (c) 1998, 2003-2005, 2010-2011, 2013-2015 |
7 | | * Todd C. Miller <Todd.Miller@sudo.ws> |
8 | | * |
9 | | * Permission to use, copy, modify, and distribute this software for any |
10 | | * purpose with or without fee is hereby granted, provided that the above |
11 | | * copyright notice and this permission notice appear in all copies. |
12 | | * |
13 | | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
14 | | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
15 | | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
16 | | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
17 | | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
18 | | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
19 | | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
20 | | */ |
21 | | |
22 | | #include <config.h> |
23 | | |
24 | | #ifndef HAVE_STRLCPY |
25 | | |
26 | | #include <string.h> |
27 | | |
28 | | #include <sudo_compat.h> |
29 | | |
30 | | /* |
31 | | * Copy string src to buffer dst of size dsize. At most dsize-1 |
32 | | * chars will be copied. Always NUL terminates (unless dsize == 0). |
33 | | * Returns strlen(src); if retval >= dsize, truncation occurred. |
34 | | */ |
35 | | size_t |
36 | | sudo_strlcpy(char * restrict dst, const char * restrict src, size_t dsize) |
37 | 1.90k | { |
38 | 1.90k | const char *osrc = src; |
39 | 1.90k | size_t nleft = dsize; |
40 | | |
41 | | /* Copy as many bytes as will fit. */ |
42 | 1.90k | if (nleft != 0) { |
43 | 41.8k | while (--nleft != 0) { |
44 | 41.8k | if ((*dst++ = *src++) == '\0') |
45 | 1.90k | break; |
46 | 41.8k | } |
47 | 1.90k | } |
48 | | |
49 | | /* Not enough room in dst, add NUL and traverse rest of src. */ |
50 | 1.90k | if (nleft == 0) { |
51 | 0 | if (dsize != 0) |
52 | 0 | *dst = '\0'; /* NUL-terminate dst */ |
53 | 0 | while (*src++) |
54 | 0 | continue; |
55 | 0 | } |
56 | | |
57 | 1.90k | return((size_t)(src - osrc) - 1); /* count does not include NUL */ |
58 | 1.90k | } |
59 | | #endif /* HAVE_STRLCPY */ |