1*4882a593Smuzhiyun /* $OpenBSD: strlcpy.c,v 1.15 2016/10/16 17:37:39 dtucker Exp $ */
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun /*
4*4882a593Smuzhiyun * Copyright (c) 1998, 2015 Todd C. Miller <Todd.Miller@courtesan.com>
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Permission to use, copy, modify, and distribute this software for any
7*4882a593Smuzhiyun * purpose with or without fee is hereby granted, provided that the above
8*4882a593Smuzhiyun * copyright notice and this permission notice appear in all copies.
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11*4882a593Smuzhiyun * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12*4882a593Smuzhiyun * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13*4882a593Smuzhiyun * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14*4882a593Smuzhiyun * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15*4882a593Smuzhiyun * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16*4882a593Smuzhiyun * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17*4882a593Smuzhiyun */
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include <sys/types.h>
20*4882a593Smuzhiyun #include <string.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun * Copy string src to buffer dst of size dsize. At most dsize-1
24*4882a593Smuzhiyun * chars will be copied. Always NUL terminates (unless dsize == 0).
25*4882a593Smuzhiyun * Returns strlen(src); if retval >= dsize, truncation occurred.
26*4882a593Smuzhiyun */
27*4882a593Smuzhiyun size_t
strlcpy(char * dst,const char * src,size_t dsize)28*4882a593Smuzhiyun strlcpy(char *dst, const char *src, size_t dsize)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun const char *osrc = src;
31*4882a593Smuzhiyun size_t nleft = dsize;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /* Copy as many bytes as will fit. */
34*4882a593Smuzhiyun if (nleft != 0) {
35*4882a593Smuzhiyun while (--nleft != 0) {
36*4882a593Smuzhiyun if ((*dst++ = *src++) == '\0')
37*4882a593Smuzhiyun break;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun /* Not enough room in dst, add NUL and traverse rest of src. */
42*4882a593Smuzhiyun if (nleft == 0) {
43*4882a593Smuzhiyun if (dsize != 0)
44*4882a593Smuzhiyun *dst = '\0'; /* NUL-terminate dst */
45*4882a593Smuzhiyun while (*src++)
46*4882a593Smuzhiyun ;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun return(src - osrc - 1); /* count does not include NUL */
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun DEF_WEAK(strlcpy);
52