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Rev | Author | Line No. | Line |
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6557 | serge | 1 | /* $OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $ */ |
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3 | /* |
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4 | * Copyright (c) 1998 Todd C. Miller |
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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 | */ |
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29 | |||
30 | #if defined(LIBC_SCCS) && !defined(lint) |
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31 | static char *rcsid = "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $"; |
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32 | #endif /* LIBC_SCCS and not lint */ |
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33 | |||
34 | #include |
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35 | #include |
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36 | |||
37 | /* |
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38 | * Appends src to string dst of size siz (unlike strncat, siz is the |
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39 | * full size of dst, not space left). At most siz-1 characters |
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40 | * will be copied. Always NUL terminates (unless siz <= strlen(dst)). |
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41 | * Returns strlen(src) + MIN(siz, strlen(initial dst)). |
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42 | * If retval >= siz, truncation occurred. |
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43 | */ |
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44 | size_t |
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45 | _DEFUN (strlcat, (dst, src, siz), |
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46 | char *dst _AND |
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47 | _CONST char *src _AND |
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48 | size_t siz) |
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49 | { |
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50 | register char *d = dst; |
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51 | register const char *s = src; |
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52 | register size_t n = siz; |
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53 | size_t dlen; |
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54 | |||
55 | /* Find the end of dst and adjust bytes left but don't go past end */ |
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56 | while (n-- != 0 && *d != '\0') |
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57 | d++; |
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58 | dlen = d - dst; |
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59 | n = siz - dlen; |
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60 | |||
61 | if (n == 0) |
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62 | return(dlen + strlen(s)); |
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63 | while (*s != '\0') { |
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64 | if (n != 1) { |
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65 | *d++ = *s; |
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66 | n--; |
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67 | } |
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68 | s++; |
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69 | } |
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70 | *d = '\0'; |
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71 | |||
72 | return(dlen + (s - src)); /* count does not include NUL */ |
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73 | }=> |
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74 |