50 lines
795 B
C
50 lines
795 B
C
#include <string.h>
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#include <assert.h>
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#include <stdio.h>
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unsigned b[4096];
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void testfwd(unsigned sz)
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{
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for(unsigned i=0; i<4096; i++)
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b[i] = i;
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memmove(b + 100, b + 101, 2 * sz);
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for(unsigned i=0; i<100; i++)
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assert(b[i] == i);
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for(unsigned i=100; i<100 + sz; i++)
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assert(b[i] == i + 1);
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for(unsigned i=100 + sz; i<4096; i++)
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assert(b[i] == i);
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}
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void testback(unsigned sz)
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{
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for(unsigned i=0; i<4096; i++)
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b[i] = i;
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memmove(b + 101, b + 100, 2 * sz);
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for(unsigned i=0; i<101; i++)
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assert(b[i] == i);
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for(unsigned i=101; i<101 + sz; i++)
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assert(b[i] == i - 1);
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for(unsigned i=101 + sz; i<4096; i++)
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assert(b[i] == i);
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}
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int main(void)
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{
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for(unsigned i=1; i<2048; i *= 2)
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{
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testfwd(i - 1);
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testfwd(i);
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testback(i);
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testback(i - 1);
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}
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return 0;
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}
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