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1449
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1 /***********************************************************
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2 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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3 Amsterdam, The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* A perhaps slow but I hope correct implementation of memmove */
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26
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27 extern char *memcpy();
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28
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29 char *
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30 memmove(dst, src, n)
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31 char *dst;
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32 char *src;
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33 int n;
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34 {
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35 char *realdst = dst;
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36 if (n <= 0)
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37 return dst;
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38 if (src >= dst+n || dst >= src+n)
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39 return memcpy(dst, src, n);
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40 if (src > dst) {
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41 while (--n >= 0)
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42 *dst++ = *src++;
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43 }
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44 else if (src < dst) {
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45 src += n;
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46 dst += n;
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47 while (--n >= 0)
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48 *--dst = *--src;
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49 }
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50 return realdst;
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51 }
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