1 2 #include <stdlib.h> 3 4 int main(void) 5 { 6 int i; 7 int* y; 8 int** x = malloc(sizeof(int*) * 100); 9 int* x2 = malloc(sizeof(int) * 100); 10 void* sink; 11 x[0] = x2; // this is to check the pointerness is copied across ok 12 x[49] = x2; // this is to check the pointerness is copied across ok 13 14 i = *x[0]; 15 i = *x[49]; 16 17 x = realloc(x, sizeof(int*)*50); // smaller 18 y = x[0]; // ok 19 y = x[49]; // ok 20 y = x[-1]; // bad 21 y = x[50]; // bad 22 i = *x[0]; // ok 23 i = *x[49]; // ok 24 25 x = realloc(x, sizeof(int*)*50); // same size 26 y = x[0]; // ok 27 y = x[49]; // ok 28 y = x[-1]; // bad 29 y = x[50]; // bad 30 i = *x[0]; // ok 31 i = *x[49]; // ok 32 33 x = realloc(x, sizeof(int*)*100); // bigger 34 y = x[0]; // ok 35 y = x[49]; // ok 36 y = x[50]; // ok 37 y = x[99]; // ok 38 y = x[-1]; // bad 39 y = x[100]; // bad 40 i = *x[0]; // ok 41 i = *x[49]; // ok 42 43 sink = realloc((void*)0x99, 10); // fails 44 45 return 0; 46 } 47
