Simple bitmap data structure

bitmap.h

#ifndef BITMAP_H
#define BITMAP_H

#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>

typedef uint32_t bitmap_t;

static inline bitmap_t *bitmap_alloc(size_t n) {
    return calloc((n >> 5) + (n & 0x1f ? 1 : 0), sizeof(bitmap_t));
}

static inline void bitmap_clear(bitmap_t *bitmap, size_t n) {
    memset(bitmap, 0, ((n >> 5) + (n & 0x1f ? 1 : 0)) * sizeof(bitmap_t));
}

static inline bool bitmap_is_bit_set(const bitmap_t *bitmap, size_t bit) {
    bitmap_t cell = bitmap[bit >> 5];
    return (cell >> (bit & 0x1f)) & 1;
}

static inline void bitmap_set_bit(bitmap_t *bitmap, size_t bit) {
    bitmap[bit >> 5] |= 1UL << (bit & 0x1f);
}

static inline void bitmap_clear_bit(bitmap_t *bitmap, size_t bit) {
    bitmap[bit >> 5] &= ~(1UL << (bit & 0x1f));
}

#endif //BITMAP_H