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#include <stddef.h>
#include "eos.h"
#include "msgq.h"
#define EOS_MSGQ_IDX_MASK(IDX, SIZE) ((IDX) & ((SIZE) - 1))
#define EOS_MSGQ_IDX_HALF ((uint8_t)1 << (sizeof(uint8_t) * 8 - 1))
#define EOS_MSGQ_IDX_LT(a,b) ((uint8_t)((uint8_t)(a) - (uint8_t)(b)) > EOS_MSGQ_IDX_HALF)
#define EOS_MSGQ_IDX_LTE(a,b) ((uint8_t)((uint8_t)(b) - (uint8_t)(a)) < EOS_MSGQ_IDX_HALF)
void eos_msgq_init(EOSMsgQ *msgq, EOSMsgItem *array, uint8_t size) {
msgq->idx_r = 0;
msgq->idx_w = 0;
msgq->array = array;
msgq->size = size;
}
int eos_msgq_push(EOSMsgQ *msgq, unsigned char type, unsigned char *buffer, uint16_t len) {
if ((uint8_t)(msgq->idx_w - msgq->idx_r) == msgq->size) return EOS_ERR_Q_FULL;
uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_w, msgq->size);
msgq->array[idx].type = type;
msgq->array[idx].buffer = buffer;
msgq->array[idx].len = len;
msgq->idx_w++;
return EOS_OK;
}
void eos_msgq_pop(EOSMsgQ *msgq, unsigned char *type, unsigned char **buffer, uint16_t *len) {
if (msgq->idx_r == msgq->idx_w) {
*type = 0;
*buffer = NULL;
} else {
uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_r, msgq->size);
*type = msgq->array[idx].type;
*buffer = msgq->array[idx].buffer;
*len = msgq->array[idx].len;
msgq->idx_r++;
}
}
void eos_msgq_get(EOSMsgQ *msgq, unsigned char type, unsigned char **buffer, uint16_t *len) {
if (msgq->idx_r == msgq->idx_w) {
*buffer = NULL;
*len = 0;
return;
}
uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_r, msgq->size);
unsigned char _type = msgq->array[idx].type;
EOSMsgItem *tmp_item = &msgq->array[idx];
*buffer = msgq->array[idx].buffer;
*len = msgq->array[idx].len;
if (_type == type) {
msgq->idx_r++;
return;
}
for (idx = msgq->idx_r + 1; EOS_MSGQ_IDX_LT(idx, msgq->idx_w); idx++) {
*tmp_item = msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)];
msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)].type = _type;
msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)].buffer = *buffer;
msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)].len = *len;
_type = tmp_item->type;
*buffer = tmp_item->buffer;
*len = tmp_item->len;
if (_type == type) {
msgq->idx_r++;
return;
}
}
*buffer = NULL;
*len = 0;
}
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