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 p;
    p.start = *buffer++;
    p.command = *buffer++;
    p.data = (*buffer++) | (((uint16_t) *buffer++) << 8);
    p.crc = *buffer++;
    p.end = *buffer++;

    printf("Start: %u\n", p.start);
    printf("Command: %u\n", p.command);
    printf("Data: %u\n", p.data);
    printf("CRC: %u\n", p.crc);
    printf("End: %u", p.end);
}

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