Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * strlcpy.c
4 : : * strncpy done right
5 : : *
6 : : * Portions Copyright (c) 1996-2024, 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
6409 tgl@sss.pgh.pa.us 45 :CBC 3269130 : strlcpy(char *dst, const char *src, size_t siz)
46 : : {
6402 bruce@momjian.us 47 : 3269130 : char *d = dst;
6409 tgl@sss.pgh.pa.us 48 : 3269130 : const char *s = src;
6402 bruce@momjian.us 49 : 3269130 : size_t n = siz;
50 : :
51 : : /* Copy as many bytes as will fit */
52 [ + - ]: 3269130 : if (n != 0)
53 : : {
54 [ + + ]: 31135966 : while (--n != 0)
55 : : {
6409 tgl@sss.pgh.pa.us 56 [ + + ]: 30944995 : if ((*d++ = *s++) == '\0')
57 : 3078159 : break;
58 : : }
59 : : }
60 : :
61 : : /* Not enough room in dst, add NUL and traverse rest of src */
6402 bruce@momjian.us 62 [ + + ]: 3269130 : if (n == 0)
63 : : {
6409 tgl@sss.pgh.pa.us 64 [ + - ]: 190971 : if (siz != 0)
6402 bruce@momjian.us 65 : 190971 : *d = '\0'; /* NUL-terminate dst */
6409 tgl@sss.pgh.pa.us 66 [ + + ]: 2387943 : while (*s++)
67 : : ;
68 : : }
69 : :
6402 bruce@momjian.us 70 : 3269130 : return (s - src - 1); /* count does not include NUL */
71 : : }
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