29 lines
744 B
C
29 lines
744 B
C
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#define DEBUG
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "../include/mem.h"
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int mem_is_zero(const void *ptr, size_t nbytes) {
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assert(ptr);
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assert(nbytes > 0);
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static const unsigned char zero_block[1024] = {0};
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while (nbytes >= sizeof(zero_block)) {
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if (memcmp(ptr, zero_block, sizeof(zero_block)) != 0)
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return 0;
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ptr = (const unsigned char *)ptr + sizeof(zero_block);
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nbytes -= sizeof(zero_block);
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}
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if (nbytes > 0 && memcmp(ptr, zero_block, nbytes) != 0)
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return 0;
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return 1;
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}
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int main(void){
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size_t nbytes = 20;
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void *ptr = ALLOC(0, nbytes);
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assert(ptr != NULL);
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assert( mem_is_zero(ptr, nbytes));
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return EXIT_SUCCESS;
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}
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