Convert Binary String to Integer Without strtol function or Libraries

Code

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

uint16_t binary_to_uint(const char *str) {
    uint16_t out = 0;
    while (*str) {
        out <<= 1;
        if (*str == '1') {
            out |= 1;
        }
        str++;
    }
    return out;
}

int main() {
    char bin[20];
    scanf("%s", bin);

    printf("%u", binary_to_uint(bin));
    return 0;
}