Validate Configuration Register Layout

Code

#include <stdio.h>
#include <stdbool.h>


#define MASK(LEN) ((1U<<(LEN))-1)
#define SHIFTED_MASK(LEN, POS) (MASK(LEN) << (POS))
#define CLEAR_FIELD(REG, LEN, POS) ((REG) &= ~(SHIFTED_MASK(LEN, POS)))
#define SET_FIELD(REG, LEN, POS, VAL)   \ 
((REG) = ((REG) & ~(SHIFTED_MASK(LEN, POS))) | ((MASK(LEN)&(VAL))) << (POS) )
#define GET_FIELD(REG, LEN, POS)    \
(((REG) >> (POS)) & MASK(LEN))

typedef struct {
    unsigned short reg;
} ConfigRegister;

int validate_config(ConfigRegister *cfg) {
    // Write logic using pointer access
    bool is_valid_enable = GET_FIELD(cfg->reg, 1, 0) == 1;
    bool is_valid_priority = GET_FIELD(cfg->reg, 2, 2) != 3;
    bool is_valid_reserve = GET_FIELD(cfg->reg, 12, 4) == 0;
    if(is_valid_enable && is_valid_priority && is_valid_reserve)
    {
        return 1;
    }
    return 0;
}

int main() {
    ConfigRegister cfg;
    scanf("%hx", &cfg.reg);

    int result = validate_config(&cfg);
    printf("%d", result);

    return 0;
}

Solving Approach