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1 /* $OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert 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 * All rights reserved. |
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6 * |
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7 * Redistribution and use in source and binary forms, with or without |
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8 * modification, are permitted provided that the following conditions |
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9 * are met: |
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10 * 1. Redistributions of source code must retain the above copyright |
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11 * notice, this list of conditions and the following disclaimer. |
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12 * 2. Redistributions in binary form must reproduce the above copyright |
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13 * notice, this list of conditions and the following disclaimer in the |
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14 * documentation and/or other materials provided with the distribution. |
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15 * 3. The name of the author may not be used to endorse or promote products |
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16 * derived from this software without specific prior written permission. |
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17 * |
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18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
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21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 * © Portions copyright (c) 2005-2006 Nokia Corporation. All rights reserved. |
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29 */ |
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30 |
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31 #if defined(LIBC_SCCS) && !defined(lint) |
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32 static char *rcsid = "$OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $"; |
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33 #endif /* LIBC_SCCS and not lint */ |
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34 #include <sys/cdefs.h> |
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35 #ifndef __SYMBIAN32__ |
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36 __FBSDID("$FreeBSD: src/lib/libc/string/strlcat.c,v 1.10 2004/10/16 06:32:43 obrien Exp $"); |
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37 #endif |
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38 |
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39 |
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40 #include <sys/types.h> |
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41 #include <string.h> |
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42 |
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43 /* |
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44 * Appends src to string dst of size siz (unlike strncat, siz is the |
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45 * full size of dst, not space left). At most siz-1 characters |
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46 * will be copied. Always NUL terminates (unless siz <= strlen(dst)). |
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47 * Returns strlen(src) + MIN(siz, strlen(initial dst)). |
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48 * If retval >= siz, truncation occurred. |
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49 */ |
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50 EXPORT_C |
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51 size_t |
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52 strlcat(dst, src, siz) |
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53 char *dst; |
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54 const char *src; |
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55 size_t siz; |
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56 { |
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57 char *d = dst; |
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58 const char *s = src; |
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59 size_t n = siz; |
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60 size_t dlen; |
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61 |
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62 /* Find the end of dst and adjust bytes left but don't go past end */ |
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63 while (n-- != 0 && *d != '\0') |
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64 d++; |
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65 dlen = d - dst; |
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66 n = siz - dlen; |
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67 |
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68 if (n == 0) |
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69 return(dlen + strlen(s)); |
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70 while (*s != '\0') { |
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71 if (n != 1) { |
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72 *d++ = *s; |
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73 n--; |
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74 } |
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75 s++; |
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76 } |
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77 *d = '\0'; |
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78 |
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79 return(dlen + (s - src)); /* count does not include NUL */ |
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80 } |