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annotate port/C/extern/strlcat.c @ 543:dc1b5143c5e3

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author David Demelier <markand@malikania.fr>
date Mon, 13 Jun 2016 16:13:40 +0200
parents port/extern/strlcat.c@996337564c4d
children 266f32919d0a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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996337564c4d Import OpenBSD strlcpy and strlcat
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1 /*
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2 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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3 * Copyright (c) 2012 David Demelier <markand@malikania.fr>
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4 *
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5 * Permission to use, copy, modify, and distribute this software for any
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6 * purpose with or without fee is hereby granted, provided that the above
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7 * copyright notice and this permission notice appear in all copies.
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8 *
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9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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16 */
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17
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18 #include <stddef.h>
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19
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20 /*
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21 * Appends src to string dst of size siz (unlike strncat, siz is the
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22 * full size of dst, not space left). At most siz-1 characters
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23 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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24 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
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25 * If retval >= siz, truncation occurred.
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26 */
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27 size_t
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28 strlcat(char *dst, const char *src, size_t siz)
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29 {
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30 char *d = dst;
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31 const char *s = src;
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32 size_t n = siz;
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33 size_t dlen;
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34
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35 /* Find the end of dst and adjust bytes left but don't go past end */
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36 while (n-- != 0 && *d != '\0')
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37 d++;
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38 dlen = d - dst;
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39 n = siz - dlen;
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40
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41 if (n == 0)
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42 return(dlen + strlen(s));
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43 while (*s != '\0') {
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44 if (n != 1) {
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45 *d++ = *s;
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46 n--;
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47 }
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48 s++;
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49 }
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50 *d = '\0';
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51
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52 return(dlen + (s - src)); /* count does not include NUL */
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53 }