Age Owner TLA Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * strlcpy.c
4 : * strncpy done right
5 : *
6 : * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
7 : *
8 : *
9 : * IDENTIFICATION
10 : * src/port/strlcpy.c
11 : *
12 : * This file was taken from OpenBSD and is used on platforms that don't
13 : * provide strlcpy(). The OpenBSD copyright terms follow.
14 : *-------------------------------------------------------------------------
15 : */
16 :
17 : /* $OpenBSD: strlcpy.c,v 1.11 2006/05/05 15:27:38 millert Exp $ */
18 :
19 : /*
20 : * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
21 : *
22 : * Permission to use, copy, modify, and distribute this software for any
23 : * purpose with or without fee is hereby granted, provided that the above
24 : * copyright notice and this permission notice appear in all copies.
25 : *
26 : * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
27 : * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
28 : * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
29 : * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
30 : * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
31 : * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
32 : * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
33 : */
34 :
35 : #include "c.h"
36 :
37 :
38 : /*
39 : * Copy src to string dst of size siz. At most siz-1 characters
40 : * will be copied. Always NUL terminates (unless siz == 0).
41 : * Returns strlen(src); if retval >= siz, truncation occurred.
42 : * Function creation history: http://www.gratisoft.us/todd/papers/strlcpy.html
43 : */
44 : size_t
6038 tgl 45 CBC 3524703 : strlcpy(char *dst, const char *src, size_t siz)
46 : {
6031 bruce 47 3524703 : char *d = dst;
6038 tgl 48 3524703 : const char *s = src;
6031 bruce 49 3524703 : size_t n = siz;
50 :
51 : /* Copy as many bytes as will fit */
52 3524703 : if (n != 0)
53 : {
54 27389495 : while (--n != 0)
55 : {
6038 tgl 56 27311800 : if ((*d++ = *s++) == '\0')
57 3447012 : break;
58 : }
59 : }
60 :
61 : /* Not enough room in dst, add NUL and traverse rest of src */
6031 bruce 62 3524703 : if (n == 0)
63 : {
6038 tgl 64 77698 : if (siz != 0)
6031 bruce 65 77698 : *d = '\0'; /* NUL-terminate dst */
6038 tgl 66 1828861 : while (*s++)
67 : ;
68 : }
69 :
6031 bruce 70 3524703 : return (s - src - 1); /* count does not include NUL */
71 : }
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