mirror of https://github.com/python/cpython.git
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/***********************************************************
|
|
Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
|
|
Amsterdam, The Netherlands.
|
|
|
|
All Rights Reserved
|
|
|
|
Permission to use, copy, modify, and distribute this software and its
|
|
documentation for any purpose and without fee is hereby granted,
|
|
provided that the above copyright notice appear in all copies and that
|
|
both that copyright notice and this permission notice appear in
|
|
supporting documentation, and that the names of Stichting Mathematisch
|
|
Centrum or CWI not be used in advertising or publicity pertaining to
|
|
distribution of the software without specific, written prior permission.
|
|
|
|
STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
|
|
THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
|
FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
|
|
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
|
|
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
******************************************************************/
|
|
|
|
/* A perhaps slow but I hope correct implementation of memmove */
|
|
|
|
extern char *memcpy();
|
|
|
|
char *
|
|
memmove(dst, src, n)
|
|
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;
|
|
}
|