79. Extract Packet Fields from Byte Stream

#include <stdio.h>
#include <stdint.h>

typedef struct {
    uint8_t start;
    uint8_t command;
    uint16_t data;
    uint8_t crc;
    uint8_t end;
} Packet;

typedef union {
    Packet s;
    uint8_t d[6];
} u;

void print_packet_fields(uint8_t *buffer) {
    u uu;
    for (int i = 0; i < 6; i++) {
        uu.d[i] = *(buffer + i);
    }
    printf("Start: %d\n", uu.s.start);
    printf("Command: %d\n", uu.s.command);
    printf("Data: %d\n", uu.s.data);
    printf("CRC: %d\n", uu.s.crc);
    printf("End: %d", uu.s.end);
}

int main() {
    uint8_t buffer[6];
    for (int i = 0; i < 6; i++) {
        scanf("%hhu", &buffer[i]);
    }
    print_packet_fields(buffer);
    return 0;
}