Set Specific Bits in a 32-bit Register

Code

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

uint32_t set_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    if (len <= 0 || pos < 0 || pos >=32 || (pos + len) > 32) {
        return reg;
    }
    uint32_t basic_mask = ((uint32_t)1 << len) - 1;

    uint32_t final_mask = basic_mask << pos;

    reg |= final_mask;

    return reg;
}

int main() {
    uint32_t reg;
    uint8_t pos, len;
    scanf("%u %hhu %hhu", &reg, &pos, &len);
    printf("%u", set_bits(reg, pos, len));
    return 0;
}

Solving Approach