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