Detect Circular Pattern Match

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

uint16_t rotate_left(uint16_t reg){
    uint8_t b = (reg & 0x8000) == 0x8000;
    reg = reg << 1;
    reg |= b;
    return reg;
}

uint8_t is_circular_match(uint16_t reg, uint16_t target) {
    for (int i = 0;i < 16;i++){
        if (reg == target){
            return 1;
        }
        reg = rotate_left(reg);
    }
    return 0;
}

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