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strlcat.c - stagit - static git page generator |
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git clone git://git.codemadness.org/stagit (git://git.codemadness.org) |
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README |
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LICENSE |
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--- |
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strlcat.c (1767B) |
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--- |
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1 /* $OpenBSD: strlcat.c,v 1.15 2015/03/02 21:41:08 millert Exp $ */ |
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2 |
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3 /* |
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4 * Copyright (c) 1998, 2015 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 #include "compat.h" |
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23 |
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24 /* |
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25 * Appends src to string dst of size dsize (unlike strncat, dsize is the |
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26 * full size of dst, not space left). At most dsize-1 characters |
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27 * will be copied. Always NUL terminates (unless dsize <= strlen(dst)). |
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28 * Returns strlen(src) + MIN(dsize, strlen(initial dst)). |
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29 * If retval >= dsize, truncation occurred. |
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30 */ |
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31 size_t |
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32 strlcat(char *dst, const char *src, size_t dsize) |
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33 { |
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34 const char *odst = dst; |
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35 const char *osrc = src; |
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36 size_t n = dsize; |
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37 size_t dlen; |
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38 |
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39 /* Find the end of dst and adjust bytes left but don't go past end. */ |
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40 while (n-- != 0 && *dst != '\0') |
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41 dst++; |
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42 dlen = dst - odst; |
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43 n = dsize - dlen; |
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44 |
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45 if (n-- == 0) |
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46 return(dlen + strlen(src)); |
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47 while (*src != '\0') { |
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48 if (n != 0) { |
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49 *dst++ = *src; |
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50 n--; |
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51 } |
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52 src++; |
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53 } |
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54 *dst = '\0'; |
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55 |
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56 return(dlen + (src - osrc)); /* count does not include NUL */ |
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57 } |
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