Set Specific Bits in a 32-bit Register

Code

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

#define REG_SIZE_BITS 31

uint32_t set_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    assert(pos < 32);

    for(uint8_t index = 0; index < len; index++)
    {
        if(pos == REG_SIZE_BITS)
        {
            break;
        }
        
        reg |= (1 << pos + index);
    }

    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