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annotate src/libmlk-util/util/openbsd/strlcat.c @ 420:7d2ebc334c8c

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misc: rename core to util
author David Demelier <markand@malikania.fr>
date Wed, 12 Oct 2022 15:26:12 +0200
parents src/libmlk-port/port/strlcat.c@7d7991f97acf
children
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1 /* $OpenBSD: strlcat.c,v 1.19 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 <stddef.h>
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20 #include <string.h>
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21
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22 /*
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23 * Appends src to string dst of size dsize (unlike strncat, dsize is the
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24 * full size of dst, not space left). At most dsize-1 characters
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25 * will be copied. Always NUL terminates (unless dsize <= strlen(dst)).
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26 * Returns strlen(src) + MIN(dsize, strlen(initial dst)).
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27 * If retval >= dsize, truncation occurred.
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28 */
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29 size_t
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30 util_strlcat(char *dst, const char *src, size_t dsize)
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31 {
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32 const char *odst = dst;
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33 const char *osrc = src;
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34 size_t n = dsize;
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35 size_t dlen;
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36
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37 /* Find the end of dst and adjust bytes left but don't go past end. */
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38 while (n-- != 0 && *dst != '\0')
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39 dst++;
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40 dlen = dst - odst;
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41 n = dsize - dlen;
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42
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43 if (n-- == 0)
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44 return(dlen + strlen(src));
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45 while (*src != '\0') {
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46 if (n != 0) {
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47 *dst++ = *src;
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48 n--;
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49 }
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50 src++;
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51 }
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52 *dst = '\0';
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53
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54 return(dlen + (src - osrc)); /* count does not include NUL */
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55 }