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#include "string.h"
void* memcpy(void* dst, const void* src, size_t n) {
const char* p;
char* q;
int rev = ((unsigned long)src < (unsigned long)dst);
if (!rev) {
for (p = (const char*)src - 1, q = (char*)dst - 1, n++; --n;)
*++q = *++p;
} else {
for (p = (const char*)src + n, q = (char*)dst + n, n++; --n;)
*--q = *--p;
}
return (dst);
}
#define cps ((unsigned char*)src)
#define cpd ((unsigned char*)dst)
#define lps ((unsigned long*)src)
#define lpd ((unsigned long*)dst)
#define deref_auto_inc(p) *++(p)
void __fill_mem(void* dst, int val, size_t n) {
unsigned long v = (unsigned char)val;
unsigned long i;
cpd = ((unsigned char*)dst) - 1;
if (n >= 32) {
i = (~(unsigned long)dst) & 3;
if (i) {
n -= i;
do
deref_auto_inc(cpd) = v;
while (--i);
}
if (v)
v |= v << 24 | v << 16 | v << 8;
lpd = ((unsigned long*)(cpd + 1)) - 1;
i = n >> 5;
if (i)
do {
deref_auto_inc(lpd) = v;
deref_auto_inc(lpd) = v;
deref_auto_inc(lpd) = v;
deref_auto_inc(lpd) = v;
deref_auto_inc(lpd) = v;
deref_auto_inc(lpd) = v;
deref_auto_inc(lpd) = v;
deref_auto_inc(lpd) = v;
} while (--i);
i = (n & 31) >> 2;
if (i)
do
deref_auto_inc(lpd) = v;
while (--i);
cpd = ((unsigned char*)(lpd + 1)) - 1;
n &= 3;
}
if (n)
do
deref_auto_inc(cpd) = v;
while (--n);
return;
}
void* memset(void* str, int c, size_t n) {
__fill_mem(str, c, n);
return str;
}
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