54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
#include "malloc_wrappers.h"
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#include <stdint.h>
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#include <assert.h>
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#include <string.h>
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static size_t alloc_count = 0;
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/* Allocate memory and place check values before and after. */
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void* malloc_with_check(size_t size)
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{
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size_t size32 = (size + 3) / 4 + 3;
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uint32_t *buf = malloc(size32 * sizeof(uint32_t));
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buf[0] = size32;
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buf[1] = 0xDEADBEEF;
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buf[size32 - 1] = 0xBADBAD;
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return buf + 2;
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}
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/* Free memory allocated with malloc_with_check() and do the checks. */
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void free_with_check(void *mem)
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{
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uint32_t *buf = (uint32_t*)mem - 2;
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assert(buf[1] == 0xDEADBEEF);
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assert(buf[buf[0] - 1] == 0xBADBAD);
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free(buf);
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}
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/* Track memory usage */
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void* counting_realloc(void *ptr, size_t size)
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{
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/* Don't allocate crazy amounts of RAM when fuzzing */
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if (size > 1000000)
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return NULL;
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if (!ptr && size)
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alloc_count++;
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return realloc(ptr, size);
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}
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void counting_free(void *ptr)
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{
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if (ptr)
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{
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assert(alloc_count > 0);
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alloc_count--;
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free(ptr);
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}
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}
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size_t get_alloc_count()
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{
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return alloc_count;
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}
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