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#ifndef KERNEL_RINGBUF_H
#define KERNEL_RINGBUF_H
#include <kernel/kmalloc.h>
#include <kernel/string.h>
#include <stdint.h>
struct ringbuf {
void *buffer;
void *buf_end;
uint32_t capacity;
uint32_t count;
uint32_t size;
void *head;
void *tail;
};
static inline void rb_init(struct ringbuf *rb, uint32_t capacity, uint32_t size) {
rb->buffer = kmalloc(capacity * size);
rb->buf_end = (char*)rb->buffer + (capacity * size);
rb->capacity = capacity;
rb->size = size;
rb->head = rb->buffer;
rb->tail = rb->buffer;
}
static inline int rb_push_back(struct ringbuf *rb, const void *item, size_t size) {
if (rb->count == rb->capacity)
return -1;
if (size > rb->size)
return -1;
void *tmp = rb->tail + rb->size;
if (tmp > rb->head + rb->capacity * rb->size)
rb->tail = rb->head;
memcpy(rb->tail, item, size);
rb->tail += rb->size;
rb->count++;
return 0;
}
static inline void rb_pop_front(struct ringbuf *rb, void *item) {
memcpy(item, rb->tail, rb->size);
rb->tail = (char*)rb->tail + rb->size;
if (rb->tail == rb->buf_end)
rb->tail = rb->buffer;
rb->count--;
}
#endif
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