mirror of https://github.com/python/cpython.git
35 lines
879 B
C
35 lines
879 B
C
/***********************************************************
|
|
Copyright (c) 2000, BeOpen.com.
|
|
Copyright (c) 1995-2000, Corporation for National Research Initiatives.
|
|
Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
|
|
All rights reserved.
|
|
|
|
See the file "Misc/COPYRIGHT" for information on usage and
|
|
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
|
******************************************************************/
|
|
|
|
/* A perhaps slow but I hope correct implementation of memmove */
|
|
|
|
extern char *memcpy(char *, char *, int);
|
|
|
|
char *
|
|
memmove(char *dst, char *src, int n)
|
|
{
|
|
char *realdst = dst;
|
|
if (n <= 0)
|
|
return dst;
|
|
if (src >= dst+n || dst >= src+n)
|
|
return memcpy(dst, src, n);
|
|
if (src > dst) {
|
|
while (--n >= 0)
|
|
*dst++ = *src++;
|
|
}
|
|
else if (src < dst) {
|
|
src += n;
|
|
dst += n;
|
|
while (--n >= 0)
|
|
*--dst = *--src;
|
|
}
|
|
return realdst;
|
|
}
|