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;

void print_packet_fields(uint8_t *buffer) {
    // Overlay struct and print values
    Packet reg;
    reg.start = *(buffer + 0);
    reg.command = *(buffer + 1);
    reg.data = *(buffer + 2) | (*(buffer + 3) << 8);
    reg.crc = *(buffer + 4);
    reg.end = *(buffer + 5);
    printf("Start: %u\n",reg.start);
    printf("Command: %u\n",reg.command);
    printf("Data: %zu\n",reg.data);
    printf("CRC: %u\n",reg.crc);
    printf("End: %u\n",reg.end);
}

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