Mercurial > cpython-lru_cache-weakref

annotate Python/memmove.c @ 5438:e926c331ebbf legacy-trunk

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Instead of importing graminit.h whenever one of the three grammar 'root' symbols is needed, define these in Python.h with a Py_ prefix.
author Guido van Rossum <guido@python.org>
date Wed, 07 May 1997 17:46:13 +0000
parents 65d2d8e67da3
children 916fb024ce94
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 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 or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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29
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30 ******************************************************************/
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31
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32 /* A perhaps slow but I hope correct implementation of memmove */
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33
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34 extern char *memcpy();
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35
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36 char *
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37 memmove(dst, src, n)
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38 char *dst;
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39 char *src;
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40 int n;
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41 {
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42 char *realdst = dst;
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43 if (n <= 0)
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44 return dst;
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45 if (src >= dst+n || dst >= src+n)
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46 return memcpy(dst, src, n);
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47 if (src > dst) {
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48 while (--n >= 0)
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49 *dst++ = *src++;
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50 }
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51 else if (src < dst) {
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52 src += n;
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53 dst += n;
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54 while (--n >= 0)
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55 *--dst = *--src;
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56 }
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57 return realdst;
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58 }