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