69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
#include "ringbuffer.h"
|
|
|
|
#include <string.h>
|
|
|
|
|
|
void *get_ptr(RingBufferT T, struct RingBufferHead *head, size_t i)
|
|
{
|
|
u8 *bytes = (u8 *)head;
|
|
return bytes + T->OFFSET + T->SIZE * i;
|
|
}
|
|
|
|
size_t RingBufferEmpty(RingBufferT T, struct RingBufferHead *head)
|
|
{
|
|
return T->LEN - head->len;
|
|
}
|
|
|
|
void *RingBufferGet(RingBufferT T, struct RingBufferHead *head, size_t i)
|
|
{
|
|
size_t wrap_i = (head->start + i) % T->LEN;
|
|
return get_ptr(T, head, wrap_i);
|
|
}
|
|
|
|
void *RingBufferNext(RingBufferT T, struct RingBufferHead *head)
|
|
{
|
|
size_t wrap_i = (head->start + head->len) % T->LEN;
|
|
return get_ptr(T, head, wrap_i);
|
|
}
|
|
|
|
void RingBufferAdd(RingBufferT T, struct RingBufferHead *dest, void *item)
|
|
{
|
|
memcpy(RingBufferNext(T, dest), item, T->SIZE);
|
|
dest->len += 1;
|
|
}
|
|
|
|
void RingBufferTransfer(
|
|
RingBufferT T,
|
|
struct RingBufferHead *dest,
|
|
struct RingBufferHead *tmp
|
|
) {
|
|
size_t copy_max = MinSize(T->LEN - dest->len, tmp->len);
|
|
|
|
for (size_t i = 0; i < copy_max; i++) {
|
|
void *to = RingBufferGet(T, dest, dest->len + i);
|
|
void *from = RingBufferGet(T, tmp, i);
|
|
memcpy(to, from, T->SIZE);
|
|
}
|
|
|
|
dest->len += copy_max;
|
|
tmp->len -= copy_max;
|
|
}
|
|
|
|
size_t RingBufferOut(
|
|
RingBufferT T,
|
|
size_t n,
|
|
void *dest,
|
|
struct RingBufferHead *src
|
|
) {
|
|
size_t copy_max = MinSize(n, src->len);
|
|
|
|
for (size_t i = 0; i < copy_max; i++) {
|
|
void *to = (u8 *)dest + i * T->SIZE;
|
|
void *from = RingBufferGet(T, src, i);
|
|
memcpy(to, from, T->SIZE);
|
|
}
|
|
|
|
src->len -= copy_max;
|
|
|
|
return copy_max;
|
|
} |