54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
#include <stdint.h>
|
|
#include <stddef.h>
|
|
|
|
void *memcpy(void *dest, const void *src, size_t n) {
|
|
uint8_t *pdest = (uint8_t *)dest;
|
|
const uint8_t *psrc = (const uint8_t *)src;
|
|
|
|
for (size_t i = 0; i < n; i++) {
|
|
pdest[i] = psrc[i];
|
|
}
|
|
|
|
return dest;
|
|
}
|
|
|
|
void *memset(void *s, int c, size_t n) {
|
|
uint8_t *p = (uint8_t *)s;
|
|
|
|
for (size_t i = 0; i < n; i++) {
|
|
p[i] = (uint8_t)c;
|
|
}
|
|
|
|
return s;
|
|
}
|
|
|
|
void *memmove(void *dest, const void *src, size_t n) {
|
|
uint8_t *pdest = (uint8_t *)dest;
|
|
const uint8_t *psrc = (const uint8_t *)src;
|
|
|
|
if (src > dest) {
|
|
for (size_t i = 0; i < n; i++) {
|
|
pdest[i] = psrc[i];
|
|
}
|
|
} else if (src < dest) {
|
|
for (size_t i = n; i > 0; i--) {
|
|
pdest[i-1] = psrc[i-1];
|
|
}
|
|
}
|
|
|
|
return dest;
|
|
}
|
|
|
|
int memcmp(const void *s1, const void *s2, size_t n) {
|
|
const uint8_t *p1 = (const uint8_t *)s1;
|
|
const uint8_t *p2 = (const uint8_t *)s2;
|
|
|
|
for (size_t i = 0; i < n; i++) {
|
|
if (p1[i] != p2[i]) {
|
|
return p1[i] < p2[i] ? -1 : 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|