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annotate port/extern/strlcat.c @ 503:964b8b700087
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author | David Demelier <markand@malikania.fr> |
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date | Wed, 03 Feb 2016 10:30:59 +0100 |
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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 } |