Mercurial > cpython-lru_cache-weakref

annotate Python/memmove.c @ 13267:4ce255495da3 legacy-trunk

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Jack Jansen, Mac patch: If we have stat.h include it if we don't have sys/stat.h
author Guido van Rossum <guido@python.org>
date Sat, 01 Jul 2000 01:08:11 +0000
parents 87ee82e5c56d
children f79434ee41fa
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* A perhaps slow but I hope correct implementation of memmove */
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12
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13 extern char *memcpy();
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14
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15 char *
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16 memmove(dst, src, n)
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17 char *dst;
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18 char *src;
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19 int n;
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20 {
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21 char *realdst = dst;
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22 if (n <= 0)
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23 return dst;
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24 if (src >= dst+n || dst >= src+n)
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25 return memcpy(dst, src, n);
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26 if (src > dst) {
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27 while (--n >= 0)
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28 *dst++ = *src++;
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29 }
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30 else if (src < dst) {
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31 src += n;
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32 dst += n;
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33 while (--n >= 0)
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34 *--dst = *--src;
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35 }
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36 return realdst;
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37 }