mirror of
https://github.com/python/cpython.git
synced 2025-11-03 15:11:34 +00:00
25 lines
439 B
C
25 lines
439 B
C
|
|
/* 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;
|
|
}
|