Extract Allocation Status from Encoded Block Header

Task

Implement the function get_curr_status

• Write a function that takes a pointer to a block_header struct
• The block_header struct contains a single size_t field, which encodes the block size and status bits
• The lowest bit (bit 0) of the size_status field indicates whether the current lock is allocated (1) or free (0)
• Your function should return 1 if the block is allocated, 0 if it is free

Function Signature

// Given a pointer to a block_header, return 1 if the block is allocated, 0 if it is free.
int get_curr_status(struct block_header* header);

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Example

Encoded size_status value	Allocated? (Output)
0x0000000000000040	0
0x0000000000000041	1
0x0000000000000100	0
0x0000000000000101	1
0x0000000000000200	0
0x0000000000000201	1
0x0000000000001000	0
0x0000000000001001	1

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Code

#include <stddef.h>
#include <stdio.h>
 
struct block_header {
    size_t size_status;
};
 
size_t get_curr_status(struct block_header* block) {
    if(block->size_status % 2 == 1) {return 1;}
    return 0;
}
 
int main(int argc, char** argv) {
    struct block_header a = {0x440};
    struct block_header b = {0x443};
    printf("a->%02lx %ld\n", a.size_status, get_curr_status(&a));
    printf("b->%02lx %ld\n", b.size_status, get_curr_status(&b));
    return 0;
}