rulimine/test/memory.c

53 lines
1001 B
C

#include <stddef.h>
#include <stdint.h>
void *memcpy(void *dest, const void *src, size_t n) {
uint8_t *pdest = dest;
const uint8_t *psrc = 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 = 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 = dest;
const uint8_t *psrc = 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 = s1;
const uint8_t *p2 = s2;
for (size_t i = 0; i < n; i++) {
if (p1[i] != p2[i])
return p1[i] < p2[i] ? -1 : 1;
}
return 0;
}