mirror of https://github.com/PrimeDecomp/prime.git
86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
#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 &= (unsigned char)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;
|
|
}
|