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annotate compat/strlcat.c @ 0:6ce4443e7545

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Add the draft of an API to collect statistics on LXC
author Louis Opter <kalessin@kalessin.fr>
date Wed, 29 Dec 2010 23:28:14 +0100
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6ce4443e7545 Add the draft of an API to collect statistics on LXC
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1 /* $OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $ */
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2
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3 /*
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4 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
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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 #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 siz (unlike strncat, siz is the
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24 * full size of dst, not space left). At most siz-1 characters
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25 * will be copied. Always NUL terminates (unless siz <= strlen(dst)).
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26 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
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27 * If retval >= siz, truncation occurred.
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28 */
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29 size_t
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30 _lxcst_strlcat(char *dst, const char *src, size_t siz)
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31 {
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32 char *d = dst;
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33 const char *s = src;
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34 size_t n = siz;
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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 && *d != '\0')
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39 d++;
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40 dlen = d - dst;
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41 n = siz - dlen;
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42
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43 if (n == 0)
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44 return(dlen + strlen(s));
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45 while (*s != '\0') {
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46 if (n != 1) {
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47 *d++ = *s;
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48 n--;
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49 }
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50 s++;
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51 }
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52 *d = '\0';
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53
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54 return(dlen + (s - src)); /* count does not include NUL */
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55 }