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#include <stddef.h>
#include "eos.h"
#include "msgq.h"
#define EOS_MSGQ_IDX_MASK(IDX, SIZE) ((IDX) & ((SIZE) - 1))
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 cmd, unsigned char *buffer, uint16_t len) {
if (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].cmd = cmd;
msgq->array[idx].buffer = buffer;
msgq->array[idx].len = len;
msgq->idx_w++;
return EOS_OK;
}
void eos_msgq_pop(EOSMsgQ *msgq, unsigned char *cmd, unsigned char **buffer, uint16_t *len) {
if (msgq->idx_r == msgq->idx_w) {
*cmd = 0;
*buffer = NULL;
} else {
uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_r, msgq->size);
*cmd = msgq->array[idx].cmd;
*buffer = msgq->array[idx].buffer;
*len = msgq->array[idx].len;
msgq->idx_r++;
}
}
void eos_msgq_get(EOSMsgQ *msgq, unsigned char cmd, unsigned char **buffer, uint16_t *len) {
uint8_t idx = EOS_MSGQ_IDX_MASK(msgq->idx_r, msgq->size);
unsigned char _cmd = msgq->array[idx].cmd;
EOSMsgItem *tmp_item = &msgq->array[idx];
*buffer = msgq->array[idx].buffer;
*len = msgq->array[idx].len;
if (_cmd == cmd) {
msgq->idx_r++;
return;
}
for (idx = msgq->idx_r + 1; 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)].cmd = _cmd;
msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)].buffer = *buffer;
msgq->array[EOS_MSGQ_IDX_MASK(idx, msgq->size)].len = *len;
_cmd = tmp_item->cmd;
*buffer = tmp_item->buffer;
*len = tmp_item->len;
if (_cmd == cmd) {
msgq->idx_r++;
return;
}
}
*buffer = NULL;
*len = 0;
}
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