33. Detect Circular Pattern Match

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

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    uint8_t bits = 8 * sizeof(reg);
    uint8_t n = bits;
    while(--n < bits) {
        if (reg == target){
            return 1;
        }
        reg = (reg << 1) | !!(reg & (1U << bits - 1));
    };
    return 0;
}

int main() {
    uint16_t reg, target;
    scanf("%hu %hu", &reg, &target);
    printf("%hhu", is_circular_match(reg, target));
    return 0;
}