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 X = *(Packet*)buffer;
    long st = X.start;
    long cmd = X.command;
    long dt = X.data;
    long checksum = X.crc;
    long ed= X.end;

    printf("Start: %d\n",st);
    printf("Command: %d\n",cmd);
    printf("Data: %d\n",dt);
    printf("CRC: %d\n",checksum);
    printf("End: %d\n",ed);
}

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