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1 /* $OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $ */ |
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2 /* |
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3 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> |
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4 * All rights reserved. |
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5 * |
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6 * Redistribution and use in source and binary forms, with or without |
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7 * modification, are permitted provided that the following conditions |
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8 * are met: |
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9 * 1. Redistributions of source code must retain the above copyright |
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10 * notice, this list of conditions and the following disclaimer. |
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11 * 2. Redistributions in binary form must reproduce the above copyright |
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12 * notice, this list of conditions and the following disclaimer in the |
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13 * documentation and/or other materials provided with the distribution. |
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14 * 3. The name of the author may not be used to endorse or promote products |
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15 * derived from this software without specific prior written permission. |
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16 * |
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17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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19 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
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20 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 * © Portions copyright (c) 2005-2006 Nokia Corporation. All rights reserved. |
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28 */ |
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29 |
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30 #if defined(LIBC_SCCS) && !defined(lint) |
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31 static char *rcsid = "$OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp $"; |
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32 #endif /* LIBC_SCCS and not lint */ |
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33 #include <sys/cdefs.h> |
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34 #ifndef __SYMBIAN32__ |
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35 __FBSDID("$FreeBSD: src/lib/libc/string/strlcpy.c,v 1.8 2004/10/14 21:31:42 stefanf Exp $"); |
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36 #endif |
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37 |
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38 #include <sys/types.h> |
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39 #include <string.h> |
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40 |
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41 /* |
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42 * Copy src to string dst of size siz. At most siz-1 characters |
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43 * will be copied. Always NUL terminates (unless siz == 0). |
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44 * Returns strlen(src); if retval >= siz, truncation occurred. |
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45 */ |
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46 EXPORT_C |
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47 size_t strlcpy(dst, src, siz) |
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48 char *dst; |
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49 const char *src; |
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50 size_t siz; |
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51 { |
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52 char *d = dst; |
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53 const char *s = src; |
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54 size_t n = siz; |
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55 |
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56 /* Copy as many bytes as will fit */ |
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57 if (n != 0 && --n != 0) { |
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58 do { |
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59 if ((*d++ = *s++) == 0) |
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60 break; |
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61 } while (--n != 0); |
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62 } |
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63 |
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64 /* Not enough room in dst, add NUL and traverse rest of src */ |
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65 if (n == 0) { |
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66 if (siz != 0) |
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67 *d = '\0'; /* NUL-terminate dst */ |
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68 while (*s++) |
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69 ; |
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70 } |
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71 |
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72 return(s - src - 1); /* count does not include NUL */ |
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73 } |