45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
#include <assert.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sparsemap.h>
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wvariadic-macros"
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#define __diag(...) \
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do { \
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fprintf(stderr, "%s:%d:%s(): ", __FILE__, __LINE__, __func__); \
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fprintf(stderr, __VA_ARGS__); \
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} while (0)
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#pragma GCC diagnostic pop
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int
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main(void)
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{
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int i;
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// disable buffering
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setvbuf(stdout, NULL, _IONBF, 0); // Disable buffering for stdout
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setvbuf(stderr, NULL, _IONBF, 0); // Disable buffering for stdout
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// start with a 1KiB buffer, 1024 bits
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uint8_t *buf = calloc(1024, sizeof(uint8_t));
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// create the sparse bitmap
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sparsemap_t *map = sparsemap_wrap(buf, sizeof(uint8_t) * 1024);
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// Set every other bit (pathologically worst case) to see what happens
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// when the map is full.
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for (i = 0; i < 7744; i++) {
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if (!i % 2) {
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sparsemap_set(map, i, true);
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assert(sparsemap_is_set(map, i) == true);
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}
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}
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// On 1024 KiB of buffer with every other bit set the map holds 7744 bits
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// and then runs out of space. This next _set() call will fail.
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sparsemap_set(map, ++i, true);
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assert(sparsemap_is_set(map, i) == true);
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return 0;
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}
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