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#include <string.h>
#include "mem_funcs.h"
void* memmove(void* dst, const void* src, size_t n) {
const char* p;
char* q;
int rev = ((unsigned long)src < (unsigned long)dst);
if (n >= __min_bytes_for_long_copy) {
if ((((int)dst ^ (int)src)) & 3)
if (!rev)
__copy_longs_unaligned(dst, src, n);
else
__copy_longs_rev_unaligned(dst, src, n);
else if (!rev)
__copy_longs_aligned(dst, src, n);
else
__copy_longs_rev_aligned(dst, src, n);
return 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;
}
void* memchr(const void* src, int val, size_t n) {
const unsigned char* p;
unsigned long v = (val & 0xff);
for (p = (unsigned char*)src - 1, n++; --n;)
if ((*++p & 0xff) == v)
return (void*)p;
return NULL;
}
void* __memrchr(const void* src, int val, size_t n) {
const unsigned char* p;
unsigned long v = (val & 0xff);
for (p = (unsigned char*)src + n, n++; --n;)
if (*--p == v)
return (void*)p;
return NULL;
}
int memcmp(const void* src1, const void* src2, size_t n) {
const unsigned char* p1;
const unsigned char* p2;
for (p1 = (const unsigned char*)src1 - 1, p2 = (const unsigned char*)src2 - 1, n++; --n;)
if (*++p1 != *++p2)
return ((*p1 < *p2) ? -1 : +1);
return 0;
}
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