mirror of
https://github.com/UzixLS/KernelEx.git
synced 2025-07-18 23:11:19 +03:00
37 lines
534 B
C
Executable File
37 lines
534 B
C
Executable File
/*
|
|
* memmove.c
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
void *memmove(void *dst, const void *src, size_t n)
|
|
{
|
|
const char *p = src;
|
|
char *q = dst;
|
|
#if defined(__i386__) || defined(__x86_64__)
|
|
if (q < p) {
|
|
asm volatile("cld ; rep ; movsb"
|
|
: "+c" (n), "+S"(p), "+D"(q));
|
|
} else {
|
|
p += (n - 1);
|
|
q += (n - 1);
|
|
asm volatile("std ; rep ; movsb"
|
|
: "+c" (n), "+S"(p), "+D"(q));
|
|
}
|
|
#else
|
|
if (q < p) {
|
|
while (n--) {
|
|
*q++ = *p++;
|
|
}
|
|
} else {
|
|
p += n;
|
|
q += n;
|
|
while (n--) {
|
|
*--q = *--p;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return dst;
|
|
}
|