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#include <stddef.h>
#include <string.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 ((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].cmd = cmd;
memcpy(msgq->array[idx].buffer, buffer, len);
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++;
}
}
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