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annotate libsci/strlcpy.c @ 33:1d0ddf9e6efd

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misc: general documentation
author David Demelier <markand@malikania.fr>
date Thu, 04 Aug 2022 16:47:10 +0200
parents lib/strlcpy.c@dd078aea5d02
children
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1 /* $OpenBSD: strlcpy.c,v 1.16 2019/01/25 00:19:25 millert Exp $ */
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2
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3 /*
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4 * Copyright (c) 1998, 2015 Todd C. Miller <millert@openbsd.org>
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5 *
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6 * Permission to use, copy, modify, and distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <sys/types.h>
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20
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21 /*
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22 * Copy string src to buffer dst of size dsize. At most dsize-1
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23 * chars will be copied. Always NUL terminates (unless dsize == 0).
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24 * Returns strlen(src); if retval >= dsize, truncation occurred.
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25 */
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26 size_t
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27 util_strlcpy(char *dst, const char *src, size_t dsize)
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28 {
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29 const char *osrc = src;
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30 size_t nleft = dsize;
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31
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32 /* Copy as many bytes as will fit. */
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33 if (nleft != 0) {
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34 while (--nleft != 0) {
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35 if ((*dst++ = *src++) == '\0')
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36 break;
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37 }
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38 }
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39
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40 /* Not enough room in dst, add NUL and traverse rest of src. */
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41 if (nleft == 0) {
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42 if (dsize != 0)
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43 *dst = '\0'; /* NUL-terminate dst */
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44 while (*src++)
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45 ;
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46 }
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47
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48 return(src - osrc - 1); /* count does not include NUL */
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49 }